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sneak/pixa:main sneak/pixa:issue-90-referer-blocklist sneak/pixa:issue-80-image-proxy-integration-test sneak/pixa:issue-199-generator-ttl-expiry-test sneak/pixa:next sneak/pixa:prod sneak/pixa:feat/upaas-deployment-setup sneak/pixa:remove-whitelist-suffix-matching sneak/pixa:fix/remove-whitelist-suffix-matching sneak/pixa:fix/20-split-dockerfile sneak/pixa:ci/make-check
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pull from: sneak/pixa:issue-80-image-proxy-integration-test
Branches Tags
sneak/pixa:issue-90-referer-blocklist sneak/pixa:issue-80-image-proxy-integration-test sneak/pixa:issue-199-generator-ttl-expiry-test sneak/pixa:next sneak/pixa:main sneak/pixa:prod sneak/pixa:feat/upaas-deployment-setup sneak/pixa:remove-whitelist-suffix-matching sneak/pixa:fix/remove-whitelist-suffix-matching sneak/pixa:fix/20-split-dockerfile sneak/pixa:ci/make-check
39 Commits
main ... issue-80-image-proxy-integration-test
Author SHA1 Message Date
clawbot d0151bb308 Test the image proxy flow end to end (closes #80)
check / check (push) Failing after 2s
Details 
TestImageProxyFlow in internal/server starts the database, handlers and
middleware from the constructors pixad uses, in an fx app with a fresh
state directory, and replaces only the upstream origin with a local test
server, reached through the real fetcher by its new DialContext. For a
resize with a change to JPEG and for orig, the first request answers 200
with the right content type, decoded size and X-Pixa-Cache MISS; the
second answers HIT with the same image while the upstream has had one
request; the source and the converted image are then on disk with their
rows in SQLite. TODO.md records it and drops the item from Future Steps.

Model: opus-5-5
 2026-10-04 19:27:23 +00:00
clawbot c615a52746 Let a test give the handlers the upstream fetcher 
handlers.Params gets an optional Fetcher, marked optional for fx. When
the app provides one, the handlers pass it to the image service, whose
Fetcher option already existed for tests, instead of letting it build
its own from the config. pixad provides none, so production builds its
fetcher from the config exactly as before. A new test builds the
handlers in an fx app that provides no fetcher, as pixad does, and
checks that an allowlisted address in blocked_networks is refused with
403, which only the dialer that refuses internal addresses does. The
comment on imgcache.ServiceConfig.FetcherConfig now says that its
AllowHTTP and MaxResponseSize apply even when a fetcher is given.

Model: opus-5-5
 2026-10-04 19:27:06 +00:00
clawbot c0f2783990 Let a test give the upstream fetcher its own dial function 
httpfetcher.Config gets an optional DialContext. When it is set, New
connects with it in place of the dialer that refuses internal addresses;
the URL check and the redirect check still run. Nothing in the config
file or the environment sets it, and pixa builds its fetcher without it,
so production connects exactly as before. It lets a test outside this
package send a public-looking address to a local test server. New tests
check that a fetcher built without it refuses to connect to a local
server, and that one built with it connects through it while a loopback
URL and a redirect to a link-local address are still refused.

Model: opus-5-5
 2026-10-04 19:27:06 +00:00
clawbot 8568c17d1b Move the example config to configs/, delete scripts/ and CONVENTIONS.md (closes #97)
check / check (push) Failing after 2s
Details 
config.example.yml moves unchanged to configs/config.example.yml, the
directory REPO_POLICIES.md names for configuration examples. README.md,
the comments in internal/config/config.go and the startup error for the
placeholder signing key name the new path. scripts/manual-test.sh and
its directory are deleted. The handler tests in internal/handlers cover
every check it made except two: fetching a real image from the internet,
and a URL made on the generator page with a ttl answering 410 once the
ttl has passed (#199).
CONVENTIONS.md, a reformatted copy of the Go HTTP server conventions, is
deleted, as REPO_POLICIES.md links the canonical document.

Model: opus-5-5
 2026-10-04 21:07:52 +02:00
clawbot 625fd42ace Wait on a busy SQLite database and turn on WAL mode (closes #198)
check / check (push) Failing after 2s
Details 
Requests and the eviction pass write on separate connections, and with
no busy timeout a write that met another one failed at once with
"database is locked" and was lost. internal/database now adds
_pragma=busy_timeout(5000) to every db_url, the default or one the
operator sets, so such a write waits up to five seconds. The default
db_url's _journal_mode=WAL is not a parameter the driver reads, so it
is now _pragma=journal_mode(WAL). README.md and config.example.yml say
what pixa adds to db_url.

Model: opus-5-5
 2026-10-04 20:58:37 +02:00
clawbot 66e71b4207 Make the periodic reconciliation test wait for the startup pass (closes #189)
check / check (push) Failing after 2s
Details 
TestPeriodicReconciliationAdoptsFileThatAppearsAfterStartup slept for
three eviction intervals before writing its file, so on a slow start the
startup pass could still be running and adopt the file itself, and the
test passed without a periodic pass. It now holds the test database's
only connection until the startup pass waits for it, writes the file and
lets the connection go, as TestEvictionRunsOnPeriodicSchedule does, so
only a periodic reconciliation pass can adopt the file. Test only.

Model: opus-5-5
 2026-10-04 19:59:36 +02:00
clawbot 847ad5b428 Count what the cache holds in the default cache_max_bytes (closes #184)
check / check (push) Failing after 1s
Details 
The default cache_max_bytes was 75% of the space free at startup. The
cache's own files are not free space, so a fuller cache got a smaller
limit after a restart and eviction then deleted most of it. The default
is now 75% of the sum of the free space and what the cache already holds
by its own size accounting, at least 500 MiB. The cache works it out
when it opens, after the database is open, so the computation and its
tests moved from internal/config to internal/imgcache. The config only
records whether cache_max_bytes was set; newCacheConfig in the handlers
turns the disk cache off only for an explicit 0, and is tested for an
omitted, a zero and a positive value.

Model: opus-5-5
 2026-10-04 19:41:49 +02:00
clawbot 233a9c05ad Test logging in, logging out, the URL generator and /v1/e/ tokens (closes #77)
check / check (push) Failing after 4s
Details 
New handler tests in internal/handlers, with no network: GET / shows the
login form without a session; a wrong key shows it again with an error and
sets no session cookie; the right key answers 303 with a session cookie
marked Secure, HttpOnly and SameSite=Strict, with which GET / shows the
generator page; GET /logout empties the cookie with Max-Age=0; POST
/generate without a session answers 303 to /; /v1/e/ serves a valid
token's image, answers 410 for an expired token and 400 for one changed,
cut short or made with another signing key; a URL made on the generator
page is served by /v1/e/. No code changes.

Model: opus-5-5
 2026-10-04 19:24:39 +02:00
clawbot 842372250f Remove unsafe-inline from the Content-Security-Policy (closes #125)
check / check (push) Failing after 2s
Details 
script-src and style-src now allow only 'self'. The generator page's
two inline onclick handlers, which selected the generated URL and
copied it, move into internal/static/generator.js and are attached
with addEventListener. The bundled Tailwind script, which built styles
in the browser and injected them at runtime, is replaced by a small
hand-written internal/static/style.css holding only the rules the
login and generator pages use; the templates carry a few plain class
names in place of Tailwind's. No build step. The pages keep their
layout, not every pixel of it.

Model: opus-5-5
 2026-10-04 18:58:40 +02:00
clawbot 58d601ea48 Replace the deprecated gomodguard with gomodguard_v2 by re-vendoring .golangci.yml (closes #57)
check / check (push) Failing after 2s
Details 
.golangci.yml is the canonical copy from the main branch of
sneak/prompts, fetched unchanged. It switches off the deprecated
gomodguard, whose deprecation warning was printed on every lint run,
and turns on its successor gomodguard_v2 with the shared module block
list. It also turns on depguard with the rule that keeps
net/http/httptest out of files that are not tests. pixa has no deny
entries of its own to carry forward, and the tree needs no code changes
under the new linters. The owner approved this config in sneak/prompts.

Model: opus-5-5
 2026-10-04 18:34:54 +02:00
clawbot 48f21d4ecf Abort startup on a config file pixa cannot read (closes #176)
check / check (push) Failing after 4s
Details 
Of the places pixa looks for its config file on its own, it passed over
any place where os.Stat failed, so a file in a directory pixa may not
enter was skipped without a word and pixa started on a later file or on
the environment and defaults. Now only a path that does not exist, or
that runs through a file (such as under a HOME of /dev/null), is passed
over; any other error aborts startup naming the file, as a file that
does not parse already did. README.md says so where it gives the search
order. A config.yml that links to itself tests this as root too.

Model: opus-5-5
 2026-10-04 18:24:43 +02:00
clawbot f8c437b83f Merge TODO.md with git's union merge (closes #190)
check / check (push) Failing after 3s
Details 
Every PR adds an entry at the top of Completed Steps in TODO.md, so each
merge to next left the other open PRs conflicting there. A root
.gitattributes, copied from sneak/prompts, marks TODO.md merge=union: two
branches that each add an entry at the same place merge without a conflict
and keep both. Git then never reports a conflict in TODO.md, so the
Workflow now says to read the merged entries after every merge or rebase.

Model: opus-5-5
 2026-10-04 17:58:41 +02:00
clawbot 04093f53ad Stop TestEvictionRunsOnPeriodicSchedule racing the evictor (closes #183)
check / check (push) Failing after 1s
Details 
The test wrote each variant file and then inserted its accounting row by
hand while the evictor was running. A reconciliation pass between the two
steps adopted the file first, and the hand insert failed on the unique key.

The test now writes the files only, while it holds the test database's
only connection, so the evictor's startup pass waits after walking the
still empty variant directory. A periodic reconciliation pass then adopts
the files and the eviction pass after it evicts them; no write-pressure
notification fires. The test waits until two of the three files are gone,
then checks that usage is within the limit and that no row points at a
missing file.

Model: opus-5-5
 2026-10-04 16:58:34 +02:00
clawbot be6c715b36 Write the deployment guide and an example Caddy config (closes #89)
check / check (push) Failing after 2s
Details 
README.md gains a "Deployment" section: what the reverse proxy in front
of pixa must do (terminate TLS, pass Host, Origin and Referer on
unchanged, set X-Forwarded-For with trusted_proxies to match, wait at
least downstream_timeout, optionally refuse /metrics) and what pixa does
itself; that the state directory needs a persistent volume, what
cache_max_bytes counts and why to set it; the health check for a load
balancer; what SIGTERM does and the exit codes; and what running outside
Docker needs. configs/Caddyfile is the example, as Caddy needs no
settings beyond the host name and pixa's address.

Model: opus-5-5
 2026-10-04 15:08:03 +02:00
clawbot 604b51eea6 Test metrics auth, CORS preflight, login logging and metrics (closes #79)
check / check (push) Failing after 1s
Details 
New tests only. MetricsAuth on its own answers 401 with a challenge
without credentials or with a wrong username or password, and lets the
configured ones through. A CORS preflight request gets the same
Access-Control-Allow-Origin as a GET. A POST / carrying the signing key
leaves the key out of the request log line, and the login handler's own
log lines leave out the submitted key. The metrics middleware on its own
records a request it served; the router records nothing while no metrics
username is set.

Not tested through the router: the basic auth in front of /metrics and
recording with a metrics username set (#180).

The pinned basicauth-go compares the password in constant time.

Model: opus-5-5
 2026-10-04 14:39:27 +02:00
clawbot ba5a716223 Test the image route's signature check and error answers (closes #76)
check / check (push) Failing after 1s
Details 
New tests in internal/handlers, with no network: the status and JSON
error body the image route answers for a missing, wrong, unpadded,
upper-case or expired signature on a host not on the allowlist, or a
valid one sent for its parent domain, a sibling host, a subdomain or
the host with another domain appended; an unparseable path, localhost
as the upstream host, and an upstream error; that an allowlisted host
is served without a signature and another host only with a valid one;
and the answers of /robots.txt and the health check. An expired
signature is answered 401, as the code and README.md say, where the
issue body expected 410. No code changes.

Model: opus-5-5
 2026-10-04 13:58:29 +02:00
clawbot c7173c47d8 Return and pass on request IDs, and give /v1/e/ ETag, 304 and HEAD (closes #84)
check / check (push) Failing after 2s
Details 
Every response carries X-Request-Id, the upstream fetch sends it, and
the "upstream fetched", "image converted" and "image served" lines log
it as request_id. pixa's own RequestID middleware keeps a request's own
ID only when it is at most 64 letters, digits, '-', '_' or '.', and
otherwise makes a random one with crypto/rand, so nothing a client
chooses freely and nothing about the host reaches upstream. /v1/e/ now
sets ETag, answers a matching If-None-Match with 304 and is routed for
HEAD, through notModified, which both image handlers call. No Vary is
added: go-chi/cors already sends Vary: Origin.

Model: opus-5-5
 2026-10-04 12:41:54 +02:00
clawbot 363774c058 Document every route, encrypted URLs and the config file search (closes #75)
check / check (push) Failing after 2s
Details 
README.md "Routes" lists every route pixa registers with its method,
purpose, what it needs and the status codes it answers with, read from
the handlers, says q and fit are part of what is cached, and says the
login and generator forms need HTTPS unless debug is on. A new
"Encrypted URLs" section covers logging in with the signing key, making
a URL on the generator page, how long it lasts, and the 410 once it has
expired. "Configuration" gives the order in which pixa looks for its
config file. config.example.yml now lists db_url and env and gives every
key's default. scripts/manual-test.sh is left to #97.

Model: opus-5-5
 2026-10-04 09:58:36 +02:00
clawbot 1616e91a6a Stop cache eviction in progress at shutdown (closes #102)
check / check (push) Failing after 2s
Details 
StartEviction runs the eviction goroutine with its own context, which
StopEviction cancels in place of the old stop channel, so a pass in
progress stops at its next database call, file, row or eviction
candidate instead of running to completion, and no new pass starts.
StopEviction takes a context: when it ends before the goroutine exits,
StopEviction stops waiting and returns an error wrapping it. The
handlers' stop hook passes fx's stop context, so an eviction still
running at fx's stop deadline fails the stop and the exit code is 1.
A stop logs at most one warning.

Model: opus-5-5
 2026-10-04 09:24:42 +02:00
clawbot 6830bdc5de Remove unimplemented Purge and three unused interfaces (closes #73)
check / check (push) Failing after 2s
Details 
Purge only returned an error and nothing called it, so it is gone from
the ImageCache interface and from Service, along with its error value.
It can be added back when something needs it; eviction reclaims disk
space meanwhile. The SignatureValidator, Allowlist and Storage
interfaces in imgcache.go had no implementers and no users, and
described types that look different from the real ones, so they are
deleted. No behaviour changes.

Model: opus-5-5
 2026-10-04 08:41:37 +02:00
clawbot 5b17d1f555 Remove idle host semaphores and delete .meta with its variant (closes #87)
check / check (push) Successful in 10m10s
Details 
Each upstream host's semaphore now counts the fetches holding or waiting
for one of its slots, and is removed from hostSems when the last of them
gives its slot back or stops waiting, so a long-running pixad no longer
keeps one semaphore per host it ever fetched from.

VariantStorage.Delete removes the variant's .meta file too, a missing one
not being an error; DeleteWithMeta, which eviction called for that, is
gone.

Model: opus-5-5
 2026-10-04 07:11:31 +02:00
clawbot 3a274aaa44 Make the README's storage, formats, TLS and metrics match the code (closes #74)
check / check (push) Successful in 10m10s
Details 
"Storage" names the cache directories pixa uses (cache/sources,
cache/metadata, cache/variants) and how files are named in each; the
schema comments name the same paths, and the output_content comment says
the table is not written. Routes and the signature section give one list
of output formats, jpg and original included, and say how those two are
signed. The TLS sentence names allow_http as its exception. "Metrics"
says what exists: generic HTTP and Go runtime metrics at /metrics,
measured and served only when the metrics username and password are set.

Model: opus-5-5
 2026-10-04 06:24:36 +02:00
clawbot 00da62db2c Exit with the shutdown's code and wait for image processing (closes #86)
check / check (push) Successful in 9m56s
Details 
fx alone handles SIGINT and SIGTERM; the server's own handler, which
only cancelled a context that fx's stop did not wait for, is gone.
fx's Run exits with the shutdown's code: the one a shutdown request
carries, 0 for a signal, 1 when the app fails to start or stop.
A listen error asks fx to shut down with exit code 1. A Sentry DSN that
cannot be used fails the server's start hook, so fx stops what had
already started. The server's stop hook stops the HTTP server, then
waits for the images still being processed, both within
ShutdownTimeout; images still being processed after that are logged and
fail the stop, so the exit code is 1.

Model: opus-5-5
 2026-10-04 04:59:30 +02:00
clawbot b402eaf88c Run the checks on every script/cibuild and script/docker build (closes #101)
check / check (push) Successful in 12m55s
Details 
Both scripts pass a new CHECK_EPOCH, which the Dockerfile's make
fmt-check, make lint and make test steps name in their commands. On an
unchanged tree Docker used to serve those steps from its build cache, so
a run could pass without checking anything. The script/bootstrap steps
stay cached. A plain docker build . still works, as upaas builds the
image that way: it leaves CHECK_EPOCH empty and reuses the check steps
only for an identical build context.

Model: opus-5-5
 2026-10-04 03:58:35 +02:00
clawbot 697c14633b Share one fetch and transcode among concurrent misses (closes #65)
check / check (push) Successful in 6m19s
Details 
Requests that missed the same variant at once each fetched and
transcoded it. They now share one call through
golang.org/x/sync/singleflight, keyed on the variant cache key. The
first request processes the variant with a context that ignores its
cancellation but keeps its deadline; the others wait for its result,
holding no connection or processing slot, and return as soon as their
own context ends. The processing request waits even then, up to its
deadline. Each request counts one miss; the processing counts its fetch
and transcode once. A panic while processing is reported through the
request's Sentry hub, when there is one, and becomes an error instead
of stopping pixad.

Model: opus-5-5
 2026-10-04 01:58:48 +02:00
clawbot 021516e099 Send CORS headers only from the image routes (closes #98)
check / check (push) Successful in 4m34s
Details 
The CORS middleware with the `access_control_allow_origin` origin wrapped every route from the router root, so the login and URL generator pages and `/metrics` sent `Access-Control-Allow-Origin` too. It now wraps only `/v1/image/` and `/v1/e/`, which form a `/v1` subrouter so that a browser's preflight `OPTIONS` request still gets its answer; the maintenance mode group moved inside it unchanged. Every other route sends no CORS headers. A new test checks both image routes, a preflight included, and the login and URL generator pages. `README.md` and `config.example.yml` say the setting covers the image routes only.

Unverified by test: `/metrics`, whose middleware registers with the process-wide Prometheus registry.

Model: opus-5-5
 2026-10-03 17:49:43 +02:00
clawbot 869b5ba67f Stamp the tag or short commit in a plain docker build (closes #166)
check / check (push) Successful in 4m4s
Details 
.dockerignore now lets .git into the build context, without
.git/config, which can hold a remote URL with a credential. ARG VERSION
has no default: given none, the build stage takes the version from
git describe --tags --always, and fails if the context carries .git
and no version comes out. pixad now logs its name, version and
architecture as its first log line, through the existing
Logger.Identify, which nothing called.

Model: opus-5-5
 2026-10-02 06:01:40 +02:00
clawbot 3a2eb1f4d2 Read the architecture at run time, not via a Buildarch ldflag (closes #164)
check / check (push) Successful in 14s
Details 
CONVENTIONS.md no longer passes the build architecture in through the
Makefile. The Buildarch variable, globals field and BUILDARCH Makefile
lines are removed from every example, and the logger's Identify example
logs "arch", runtime.GOARCH, as internal/logger already does. Wording
matches the HTTP server conventions in sneak/prompts.

Model: opus-5-5
 2026-10-02 01:17:33 +02:00
clawbot fd7d7ed205 Container makes /var/lib/pixa usable before starting pixad (closes #159)
check / check (push) Successful in 22s
Details 
The entrypoint now creates /var/lib/pixa if it is missing. When the
directory or one of its top-level entries belongs to another user or
group, it gives the whole tree to pixad (uid and gid 65532); it then
sets the directory's mode to 750 and runs the server as pixad as
before. Data left by a run under another uid is taken over this way.
Only the top level is checked, so a normal start does not walk the
cache; the tree is changed deepest first, so an interrupted start is
finished by the next one.

"Running under upaas" in README.md no longer tells the operator to
create or chown the host directory.

Model: opus-5-5
 2026-09-29 12:44:37 +02:00
clawbot bce8860c2e Keep variant content types in memory for cache hits (closes #70)
check / check (push) Successful in 14s
Details 
Cache.metaCache was declared and never used, so every cache hit read
and parsed the variant's .meta file. It is now an LRU
(github.com/hashicorp/golang-lru/v2) of up to 10,000 variants' content
types, filled by StoreVariant and by a read of a .meta file, so a hit
for a variant it holds skips the .meta read. Only a type from a .meta
file or a store ever enters memory, never the application/octet-stream
fallback, and a stored type is never replaced by an older one from
disk. The variant file itself is still opened on every hit, so nothing
is served from memory alone.

Model: opus-5-5
 2026-09-29 12:00:10 +02:00
clawbot 99735f479b Answer image requests with 503 in maintenance mode (closes #71)
check / check (push) Successful in 13s
Details 
maintenance_mode was only reported by the health check; every request
was still served. One middleware in routes.go, applied to /v1/image/
and /v1/e/ only, now answers them with 503, a Retry-After of
MaintenanceRetryAfterSeconds and the JSON error body while it is on.
It calls Server.MaintenanceMode(), which had no caller.

The health check stays 200 and reports maintenance_mode: the image's
Docker HEALTHCHECK requests it, a 503 there would make the container
unhealthy, and upaas marks a deploy failed when its container is
unhealthy. The login and URL generator pages and /metrics keep working.
Documented in README.md and config.example.yml.

Model: opus-5-5
 2026-09-29 11:01:30 +02:00
clawbot baf457d21e Bound concurrent image processing and upstream fetches (closes #64)
check / check (push) Successful in 17s
Details 
Nothing bounded total in-flight work, so a burst of cache misses across
hosts could exhaust memory. Two settings now do: max_concurrent_processing
(default the CPUs Go uses) and upstream_connections (default 64, beside
the per-host limit). A request that finds either full waits up to 10
seconds, then gets 503; a slot is released on every path. No request
holds source bytes while it waits: a cached source is read only after
the processing slot is taken, and a fetched one only while it holds its
upstream connection. libvips runs one worker thread per image with its
operation cache off. Both waits count toward downstream_timeout, as the
README says.

Model: opus-5-5
 2026-09-29 10:32:16 +02:00
clawbot 0c99be939a Install Dockerfile build dependencies through script/bootstrap (closes #95)
check / check (push) Successful in 3m29s
Details 
The Dockerfile lint and build stages and Dockerfile.lint each carried
their own apk add list, a copy of what script/bootstrap installs. They
now copy script/, go.mod and go.sum and run script/bootstrap, so that
layer is reused until one of those changes. script/bootstrap gains a C
compiler check: the golang image has none, and cgo needs one.

The build adds -trimpath and -s -w; CGO_ENABLED=1 stays, as govips
links libvips. ARG VERSION moves to just above the build, so a new
version reruns neither script/bootstrap nor the tests.

Model: opus-5-5
 2026-09-29 09:11:20 +02:00
clawbot 56217cbf4a Add the four settings the README documented but pixa lacked (closes #61)
check / check (push) Successful in 15s
Details 
README.md documented access_control_allow_origin,
upstream_fetch_timeout, upstream_max_response_size and
downstream_timeout, but pixa did not know them, so a config following
the README aborted startup. Each is now a setting with its PIXA_
variable, defaulting to the value that was fixed in the code: *, 30s,
50 MiB and 60s. Durations are Go duration strings and must be positive;
the size is whole bytes, at most 1 GiB. The origin is * or one http or
https origin written exactly as a browser sends it; anything else
aborts startup. downstream_timeout sets both the server's write timeout
and the per-request timeout. The owner approved the edits to existing
tests.

Model: opus-5-5
 2026-09-29 08:49:18 +02:00
clawbot 46a55ec15d Move migrations to internal/db/migrations (closes #96)
check / check (push) Successful in 14s
Details 
REPO_POLICIES.md puts migrations in internal/db/migrations/ as
000_migration.sql and 001_schema.sql. The two files move there with
their contents unchanged. go:embed cannot reach outside its own
package, so internal/db/migrations has a small package that embeds
them, and internal/database reads them through its FS(). The database
package stays where CONVENTIONS.md puts it; moving it would change
existing test files in other packages.

The version still comes from the filename prefix, so a database that
has recorded versions 0 and 1 runs neither again. A new test applies
the migrations twice to one database file and checks that the second
run applies nothing.

Model: opus-5-5
 2026-09-29 07:42:05 +02:00
clawbot 1b920fe000 Correct trusted_proxies advice and state signature padding (closes #150)
check / check (push) Successful in 14s
Details 
The README told operators to set trusted_proxies to the proxy's own
address. A proxy on the Docker host that connects over 127.0.0.1 reaches
pixa from the Docker network's gateway, so that advice made pixa count
every user as one client for the login limit. The login-limit paragraph,
the trusted_proxies entry and config.example.yml now say to use the
address pixa sees for requests through the proxy, that a proxy connecting
through another host address is seen with that address, and how to read
it from the request log.

The signature section now says sig is base64url with the = padding
kept, since pixa compares it exactly, and shows the example's sig for a
stated key, computed with pixa's signer.

Model: opus-5-5
 2026-09-29 06:05:44 +02:00
clawbot e98b998cb6 Make the cache stats count what is cached, fetched and transcoded (closes #56)
check / check (push) Successful in 18s
Details 
Cache.Stats read request_cache and output_content, which nothing
writes, so TotalItems and TotalSizeBytes were always 0. They now count
source_content plus variant_content and use UsageBytes; a disabled disk
cache reports 0 for both. The upstream fetch count and bytes and the
transform count never moved: Get now passes the bytes it fetched
(including those read before a failed body read) and counts each
successful transcode. Hits, misses and these counters are written with
context.WithoutCancel, so a client disconnect or the request timeout no
longer loses them. The unused tables stay; metaCache is #70.

Model: opus-5-5
 2026-09-29 05:25:10 +02:00
clawbot ed3f8770e6 Give pixad a fixed uid and gid 65532 (closes #151)
check / check (push) Successful in 20s
Details 
adduser took the first free uid, 1000, and the entrypoint gives a
bind-mounted /var/lib/pixa to pixad, so on the host a person's login
account ended up owning pixa's database and cache. The image now creates
the pixad group with gid 65532 and the pixad user with uid 65532, which
host login and system accounts do not use. The first-run step of
"Running under upaas" in README.md names the uid and gid.

Model: opus-5-5
 2026-09-29 04:44:49 +02:00
clawbot 2afe61e301 Keep max-age within an expiring image URL's lifetime (closes #63)
check / check (push) Successful in 12s
Details 
Both image routes sent Cache-Control: public, max-age=31536000,
immutable unconditionally, so a browser or proxy could keep serving an
image for a year after its signed or encrypted URL had expired. max-age
is now the whole seconds left until the URL expires, never negative and
at most one year; a URL with no expiry keeps one year. The 304 answer
uses the same value. An encrypted URL's expiry now reaches
ImageRequest.Expires through ToImageRequest. immutable stays: freshness
now ends no later than the URL's expiry. README.md documents the header.

Model: opus-5-5
 2026-09-29 03:51:58 +02:00
89 changed files with 8706 additions and 2550 deletions
Expand all files Collapse all files
.dockerignore
+5 -1
View File
@@ -1,4 +1,8 @@
.git
# .git is sent without its config. Without a VERSION build argument the
# stage that compiles runs `git describe --tags --always` on .git, which
# does not need .git/config; that file can hold a credential, such as a
# password in a remote URL or the token the CI checkout step stores there.
.git/config
.gitignore
.DS_Store
.env*
.gitattributes
+4
View File
@@ -0,0 +1,4 @@
# Every PR adds an entry at the top of TODO.md's Completed Steps; union keeps
# both sides instead of conflicting. Git never reports a conflict here: read
# the merged entries after every merge or rebase.
TODO.md merge=union
.golangci.yml
+66 -2
View File
@@ -10,14 +10,20 @@ run:
linters:
default: all
enable:
# Successor to the deprecated gomodguard. Named explicitly, rather than
# left to `default: all`, because it carries the module policy below.
- gomodguard_v2
disable:
# Genuinely incompatible with project patterns
- exhaustruct # Requires all struct fields
- depguard # Dependency allow/block lists
- godot # Requires comments to end with periods
- wsl # Deprecated, replaced by wsl_v5
- wrapcheck # Too verbose for internal packages
- varnamelen # Short names like db, id are idiomatic Go
# Deprecated: the warning is attached to the old name, so it is
# silenced by disabling that name, not by enabling the successor.
- wsl # Deprecated, replaced by wsl_v5
- gomodguard # Deprecated, replaced by gomodguard_v2
settings:
lll:
line-length: 88
@@ -28,6 +34,64 @@ linters:
max-complexity: 15
dupl:
threshold: 100
depguard:
# Test-support code must not be compiled into the shipped binary. A
# test-support package exists to hand a test privileges the program
# itself must never have, so a file that is not a test must not import
# one. Test files, and the files inside a package whose directory name
# ends in `test`, are where that code belongs, and are exempt.
#
# The deny list below is the one part of this file a repository is
# expected to extend, and the only part it may. depguard matches an
# import path against a list of prefixes, so it cannot be told "any path
# whose last segment ends in test"; a repository's own test-support
# packages have to be named here one at a time, by full import path,
# under a module path that differs from repository to repository. Add
# them; change nothing else.
rules:
test-support:
list-mode: lax
files:
- "$all"
- "!$test"
- "!**/*test/**"
deny:
- pkg: net/http/httptest
desc: >-
Test-support code belongs in test files and in packages whose
directory name ends in test, not in the shipped binary.
# Only decisions already recorded in the Go package defaults are
# listed here. Every entry matches the module path exactly.
gomodguard_v2:
blocked:
- module: github.com/rs/zerolog
recommendations:
- log/slog
reason: "Structured logging is stdlib log/slog."
# One entry per pre-fork module path, because the later releases
# are separate paths. A prefix match would be shorter but would
# also reach github.com/go-redis/redismock, the test double for
# the successor these entries recommend.
- module: github.com/go-redis/redis
recommendations:
- github.com/redis/go-redis/v9
reason: "Pre-fork module; use the maintained go-redis v9."
- module: github.com/go-redis/redis/v7
recommendations:
- github.com/redis/go-redis/v9
reason: "Pre-fork module; use the maintained go-redis v9."
- module: github.com/go-redis/redis/v8
recommendations:
- github.com/redis/go-redis/v9
reason: "Pre-fork module; use the maintained go-redis v9."
- module: github.com/sergi/go-diff
recommendations:
- github.com/aymanbagabas/go-udiff
reason: "No unified diff output; use go-udiff."
- module: github.com/hexops/gotextdiff
recommendations:
- github.com/aymanbagabas/go-udiff
reason: "Unmaintained fork; use go-udiff."
issues:
max-issues-per-linter: 0
CONVENTIONS.md
-1267
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File diff suppressed because it is too large Load Diff
Dockerfile
+44 -24
View File
@@ -3,13 +3,14 @@
# golangci/golangci-lint:v2.12.2-alpine, 2026-08-07
FROM golangci/golangci-lint:v2.12.2-alpine@sha256:91b27804074a0bacea298707f016911e60cf0cdbc6c7bf5ccacb5f0606d18d60 AS lint
RUN apk add --no-cache make build-base vips-dev libheif-dev pkgconfig
WORKDIR /src
# Copy go mod files first for better layer caching
# script/bootstrap installs the build dependencies and downloads the Go
# modules. Only script/, go.mod and go.sum are copied first, so this
# layer is reused until one of them changes.
COPY script/ ./script/
COPY go.mod go.sum ./
RUN go mod download
RUN script/bootstrap
# Copy source code
COPY . .
@@ -17,9 +18,14 @@ COPY . .
# Tells script/lint it is inside a container, so it runs the linter.
ENV container=docker
# Run formatting check and linter
RUN make fmt-check
RUN make lint
# Run formatting check and linter. script/cibuild and script/docker pass
# a new CHECK_EPOCH on every run, and each check step names it in its
# command, so a new value reruns the step instead of reusing a cached
# success that checked nothing. A plain `docker build .` leaves it empty
# and reuses the check steps only for an identical build context.
ARG CHECK_EPOCH
RUN echo "check epoch: ${CHECK_EPOCH}" && make fmt-check
RUN echo "check epoch: ${CHECK_EPOCH}" && make lint
# Build stage
# golang:1.25.4-alpine, 2026-02-25
@@ -28,29 +34,39 @@ FROM golang:1.25.4-alpine@sha256:d3f0cf7723f3429e3f9ed846243970b20a2de7bae6a5b66
# Depend on lint stage passing
COPY --from=lint /src/go.sum /dev/null
ARG VERSION=dev
# Install build dependencies for CGO image libraries
RUN apk add --no-cache \
build-base \
vips-dev \
libheif-dev \
pkgconfig
WORKDIR /src
# Copy go mod files first for better layer caching
# Build dependencies and Go modules, as in the lint stage
COPY script/ ./script/
COPY go.mod go.sum ./
RUN GOTOOLCHAIN=auto go mod download
RUN script/bootstrap
# Copy source code
COPY . .
# Run tests
RUN make test
# Run tests; a new CHECK_EPOCH reruns them, as in the lint stage.
ARG CHECK_EPOCH
RUN echo "check epoch: ${CHECK_EPOCH}" && make test
# Build with CGO enabled
RUN CGO_ENABLED=1 GOTOOLCHAIN=auto go build -ldflags "-X main.Version=${VERSION}" -o /pixad ./cmd/pixad
# VERSION is declared here, not earlier: a new value reruns only the
# build, not script/bootstrap or the tests. Given none, the version is
# `git describe --tags --always` of the .git in the build context (git
# comes from script/bootstrap): the tag on a tagged commit, tag-N-gHASH
# after one, the short commit when no tag is reachable. A context that
# carries .git and still yields no version fails the build; one without
# .git, as from a source tarball, stamps an empty version. CGO stays
# enabled for govips; -trimpath keeps build paths out of the binary, and
# -s -w leave out the symbol table and debug information.
ARG VERSION
RUN version="${VERSION:-$(git describe --tags --always)}"; \
if [ -e .git ] && { [ -z "$version" ] || [ "$version" = dev ] || \
[ "$version" = unknown ]; }; then \
echo "the build context carries .git but yields no version" >&2; \
exit 1; \
fi; \
CGO_ENABLED=1 GOTOOLCHAIN=auto go build -trimpath \
-ldflags "-s -w -X main.Version=${version}" \
-o /pixad ./cmd/pixad
# Runtime stage
# alpine:3.21, 2026-02-25
@@ -68,8 +84,12 @@ RUN apk add --no-cache \
COPY --from=builder /pixad /usr/local/bin/pixad
COPY deploy/docker-entrypoint.sh /usr/local/bin/docker-entrypoint.sh
# Create non-root user, config directory, and data directory
RUN adduser -D -H -s /sbin/nologin pixad && \
# Create non-root user, config directory, and data directory. pixad
# gets uid and gid 65532, which host login and system accounts do not
# use: a bind-mounted /var/lib/pixa is given to pixad, and on the host
# it must not belong to a person's account.
RUN addgroup -g 65532 pixad && \
adduser -D -H -s /sbin/nologin -u 65532 -G pixad pixad && \
mkdir -p /var/lib/pixa /etc/pixa && \
chown pixad:pixad /var/lib/pixa
Dockerfile.lint
+7 -7
View File
@@ -6,16 +6,16 @@
# golangci/golangci-lint:v2.12.2-alpine, 2026-08-07
FROM golangci/golangci-lint:v2.12.2-alpine@sha256:91b27804074a0bacea298707f016911e60cf0cdbc6c7bf5ccacb5f0606d18d60
# pixa is CGO/libvips: the type-aware linters compile every package, so
# this image needs the same C libraries the build does.
RUN apk add --no-cache build-base vips-dev libheif-dev pkgconfig
WORKDIR /src
# Modules first for layer caching; go.mod/go.sum settle this layer's
# result, so it may safely be reused between runs.
# pixa is CGO/libvips: the type-aware linters compile every package, so
# this image needs the same C libraries the build does. script/bootstrap
# installs them and downloads the Go modules. Only script/, go.mod and
# go.sum are copied first; they settle this layer's result, so it may
# safely be reused between runs.
COPY script/ ./script/
COPY go.mod go.sum ./
RUN go mod download
RUN script/bootstrap
COPY . .
README.md
+323 -46
View File
@@ -18,7 +18,7 @@ make build
# run with a config file: copy the example and set a real signing key
# (the example placeholder is refused at startup), e.g. with
# openssl rand -base64 32
cp config.example.yml config.yml
cp configs/config.example.yml config.yml
$EDITOR config.yml # replace the signing_key placeholder
./bin/pixad --config config.yml
@@ -34,15 +34,74 @@ else has a built-in default. A config file mounted at `/etc/pixa/config.yml`
is optional: it is read when present, and an environment variable wins over
the same setting in it.
## Deployment
pixa listens on plain HTTP and runs behind a reverse proxy that terminates TLS.
[`configs/Caddyfile`](configs/Caddyfile) is an example for Caddy, chosen because
it is the smallest correct one: Caddy gets the TLS certificate itself and does
everything in this list without further settings. The reverse proxy must:
- terminate TLS, as the login and generator pages work only over HTTPS (see
Routes);
- pass the `Host`, `Origin` and `Referer` headers on unchanged, as pixa refuses
a form from those pages unless `Origin` or `Referer` names the host in `Host`,
and builds encrypted URLs from `Host`;
- set `X-Forwarded-For` to the client's address, with `trusted_proxies` set to
the address pixa sees the proxy's requests come from, so the login limit
counts each client by its own address (see `trusted_proxies` under
Configuration);
- wait for pixa's answer for at least `downstream_timeout` (default `60s`), the
longest pixa takes to fetch, convert and send an image.
It may also refuse `/metrics`, as the example does, so that only a scraper that
reaches pixa directly can read it; pixa itself asks for the metrics username and
password there.
pixa does the rest itself: it checks signatures and encrypted URLs, applies the
allowlist, refuses upstream hosts with private or local addresses, limits login
attempts, upstream response size and image dimensions, and sends the security
headers, `Strict-Transport-Security` included, with every response.
The state directory (`state_dir`, `/var/lib/pixa` in the container) holds the
database and the disk cache:
- It needs a persistent volume: without one, every restart starts with an empty
cache. In the container, the startup script gives the directory to the user
pixa runs as (uid 65532) and sets its mode to `750`; outside it, that user
must be able to write the directory.
- `cache_max_bytes` limits the source and transformed images together. The
database, the metadata files, the `.meta` file beside each transformed image
and files still being written come on top, and eviction runs in the
background, so the cache can pass the limit for a while: leave room on the
volume beyond it.
- Set `cache_max_bytes` for a lasting deployment. Its default, worked out each
time pixa starts, is 75% of the sum of the space free on the volume and the
space the cached images already take, so a restart keeps the limit the cache
had, but anything else that fills or frees space on the volume moves it.
A load balancer's health check can request `/.well-known/healthcheck.json`,
which answers 200 whenever pixa is running, in maintenance mode too (see
`maintenance_mode`).
On SIGTERM or SIGINT pixa stops accepting connections, gives the requests in
progress and the images being processed 5 seconds to finish, and exits: with 0,
or with 1 when images were still being processed after those 5 seconds or
another part of pixa failed to stop. A request not finished by then is cut off.
`docker stop` waits 10 seconds before it kills the container.
Outside Docker, pixa needs libvips (the image has 8.15) and libheif to run, as
it uses libvips through CGO; building it also needs their development files,
`pkg-config` and a C compiler. `script/bootstrap` installs all of these with
nix, apt, brew or apk.
## Running under upaas
What the [upaas](https://git.eeqj.de/sneak/upaas) app for pixa needs:
- **Port:** pixa listens on container port `8080`.
- **Volume:** container path `/var/lib/pixa`, where pixa keeps its
database and cache. upaas bind-mounts the host path it is given and
does not create it, so the host directory must exist before the first
deploy.
database and cache. Creating the host directory when it is missing is
upaas's job, tracked in https://git.eeqj.de/sneak/upaas/issues/235.
- **Environment variables:**
- `PIXA_SIGNING_KEY` (required): secret for signed and encrypted URLs
and login, 32+ characters, for example from
@@ -50,7 +109,7 @@ What the [upaas](https://git.eeqj.de/sneak/upaas) app for pixa needs:
- `PIXA_ALLOWLIST_HOSTS`: upstream hosts served without a signature,
comma-separated
- `PIXA_CACHE_MAX_BYTES`: disk cache limit in bytes; `0` disables it;
default 75% of free space
default 75% of (free space + what the cache holds)
- the rest are in the table under Configuration below
- **Health check:** the image's `HEALTHCHECK` requests
`/.well-known/healthcheck.json`. upaas reads the container's health 60
@@ -58,8 +117,6 @@ What the [upaas](https://git.eeqj.de/sneak/upaas) app for pixa needs:
`healthy`. The probe uses the port from `PORT` (default `8080`), so a
port changed only in a mounted config file is not seen by it: change
the port with `PORT`.
- **First run:** create the host directory. It may be owned by root: the
container gives it to its `pixad` user when it starts.
## Rationale
@@ -74,42 +131,185 @@ prevent abuse, and allowlisted source hosts for open access.
### Storage
- **Source content**:
`<statedir>/cache/src-content/<ab>/<cd>/<sha256 of source content>`
`<state_dir>/cache/sources/<ab>/<cd>/<sha256 of source content>`
- **Source metadata**:
`<statedir>/cache/src-metadata/<hostname>/<sha256 of path>.json`
(fetch time, original headers, request, content hash)
- **Database**: `<statedir>/state.sqlite3` (SQLite)
- **Output documents**:
`<statedir>/cache/dst-content/<ab>/<cd>/<sha256 of output content>`
`<state_dir>/cache/metadata/<hostname>/<sha256 of path and query>.json`
(host, path and query, content hash, upstream status and headers, fetch time)
- **Database**: `<state_dir>/state.sqlite3` (SQLite)
- **Transformed images**:
`<state_dir>/cache/variants/<ab>/<cd>/<sha256 of host, path, query, size, format, quality and fit>`,
each with a `.meta` file beside it holding its content type
`<ab>` and `<cd>` are the first and second pairs of characters of the file's
name.
Multiple source paths may reference the same content blob; the
database tracks references rather than using filesystem refcounting.
In-process caching of request-to-output mappings targets 1-5k r/s.
Toward a target of 1-5k r/s, pixa keeps in memory the content types of
the 10,000 transformed images most recently cached or served, so a
cache hit on one of them reads only the image file from disk and not
the metadata file stored beside it.
### Routes
pixa answers these routes; any other path answers 404. A path in this list asked
with a method the list does not give answers 405, except `/static/<file>`, which
answers any method as it answers `GET`. A browser's CORS preflight request
(`OPTIONS` with `Origin` and `Access-Control-Request-Method` headers) to any
path under `/v1/` answers 200, in maintenance mode too.
- `GET /` — the login page, or the URL generator page with a login session
(see Encrypted URLs). Needs: nothing. Answers: 200.
- `POST /` — log in with the signing key typed into the login page. Needs: the
login page's form (below). Answers: 303 to `/` with a login session cookie
that lasts 30 days for the right key; 200 with the login page and an error for
a wrong key; 429 over the login limit (below).
- `POST /generate` — make an encrypted URL from the generator page's form.
Needs: a login session and the generator page's form (below); without a login
session it answers 303 to `/`. Answers: 200 with the page showing the URL; 400
with the page naming a field that is not valid; 500 when the URL cannot be
made.
- `GET /logout` — end the login session. Needs: nothing. Answers: 303 to `/`.
- `GET` or `HEAD` `/v1/image/<host>/<path>/<size>.<format>` — an image, fetched,
resized and converted (below). Needs: a signature, unless the host is
allowlisted (see Source Hosts). Answers: 200; 304 when `If-None-Match` matches
the image's `ETag`; 400 for a URL or parameter that is not valid; 401 for a
missing or wrong signature, a missing `exp` or an `exp` in the past; 403 when
the upstream host, or a host it redirects to, is `localhost`, ends in
`.localhost` or `.local`, or has an address in a blocked network (see
`blocked_networks`); 502 when the upstream answered with an error status, and
for 5 minutes after that for the same source URL; 503 when pixa is busy or in
maintenance mode; 500 for any other failure.
- `GET` or `HEAD` `/v1/e/<token>/<name>` — an image through an encrypted URL
(see Encrypted URLs). Needs: nothing but the URL. Answers: 200; 304 when
`If-None-Match` matches the image's `ETag`; 400 for a token that does not
decrypt, or that asks for a size or fit that is not valid; 410 once it has
expired; 504 when the upstream has not sent its response headers within
`upstream_fetch_timeout`, but 500 when that time runs out while the image
itself is still arriving; 403, 502, 503 and 500 as for `/v1/image/`.
- `GET /robots.txt` — asks every crawler to stay away (`Disallow: /`). Needs:
nothing. Answers: 200.
- `GET /.well-known/healthcheck.json` — JSON with `status` (`ok`), `now`,
`uptime_seconds`, `uptime_human`, `version`, `appname` and
`maintenance_mode`. Needs: nothing. Answers: 200, always.
- `GET /static/<file>` — the stylesheet and script the login and generator
pages load. Needs: nothing. Answers: 200, or 404 for a file that does not
exist.
- `GET /metrics` — Prometheus metrics (see Architecture). Needs: HTTP basic
authentication with `metrics.username` and `metrics.password`. Answers: 200;
401 without them; 404 when they are not set, as the route then does not exist.
Every response carries an `X-Request-ID` header holding the request's ID, which
a client can quote when reporting a problem: the request's own `X-Request-ID`,
as a reverse proxy in front of pixa may send, when it is at most 64 letters,
digits, `-`, `_` or `.`; otherwise a random one pixa makes for the request,
which tells nothing about the machine or the other requests. pixa's log line for
the request carries the same ID as `request_id`, and so do the lines it logs
when it fetches, converts and serves an image; the fetch sends it to the
upstream host as `X-Request-ID`.
Both `POST` routes accept only a form that pixa's own page served: the page puts
a token in the form and sets a cookie to match, and a request without both is
refused with 403, so another site cannot submit the form from a visitor's
browser. The login and generator pages are meant to be opened over HTTPS: while
`debug` is off, a form sent from a page opened over plain HTTP is refused with
403, and while it is on, so is one sent from a page opened over HTTPS. Plain
HTTP is for development on the browser's own machine: the login session cookie
is always marked `Secure`, and over plain HTTP a browser keeps such a cookie
only for its own machine (`localhost`), if at all. A form is also refused with
403 when the page's host is not the `Host` header pixa receives, so a reverse
proxy in front of pixa must pass that header on unchanged. A form body over
1 MiB is refused with 413. The image routes answer the errors listed for them
with JSON holding `error`, `status` and `timestamp`.
An image URL has this form:
```
/v1/image/<host>/<path>/<size>.<format>?sig=<signature>&exp=<expiration>
/v1/image/<host>/<path>/<size>.<format>?sig=<signature>&exp=<expiration>&q=<quality>&fit=<fit>
```
Images are only fetched from origins using TLS with valid certificates.
Images are only fetched from origins using TLS with valid certificates, unless
`allow_http` is set: then pixa fetches every image over plain HTTP, which is for
testing only.
A request whose query string cannot be decoded, or gives any parameter more
than once, is refused with 400.
- `<format>`: one of `orig`, `png`, `jpeg`, `webp`
- `<format>`: one of `orig` (or `original`), `jpeg` (or `jpg`), `png`, `webp`,
`avif`, `gif`
- `<size>`: `orig` or `<width>x<height>` (e.g. `800x600`)
- `sig` and `exp`: the signature and its expiry, needed unless the host is
allowlisted (see Signature Specification)
- `q` and `fit`: the output quality and how the image is fitted to `<size>`,
both optional (values under Signature Specification). Both are part of what
is cached, so each value of either is a separate cached image.
An image is served with `Cache-Control: public, max-age=<seconds>, immutable`.
When the URL has an expiry (an `exp`, or the TTL of an encrypted URL),
`max-age` is the whole seconds left until then, at most one year, so no browser
or proxy cache keeps the image after pixa would refuse the URL. A URL with no
expiry gets one year. `immutable` only stops a client revalidating while its
copy is fresh.
When several requests for the same image, size, format, quality and fit miss
the cache at once, they share one upstream fetch (or one read of the cached
source) and one transcode: the first request does the work, and the others wait
for its image or its error, holding no upstream connection or processing slot
of their own. A waiting request stops waiting when its own client goes away.
The work goes on for the others even if the first request's client goes away,
until that request's `downstream_timeout` ends. The shared fetch sends the first
request's ID upstream, and the lines logged for the fetch and the transcode
carry that ID.
The login form (`POST /`) is limited to 5 attempts per minute per client
address, counting an IPv6 client by its /64; an attempt over the limit is
refused with 429 and a `Retry-After` header. Behind a reverse proxy the client
address comes from `X-Forwarded-For` only when the proxy's address is in
`trusted_proxies`; otherwise all users behind the proxy are counted as one
client. With the default `trusted_proxies` (the RFC 1918 ranges), a client
with a private address can choose the address it is counted by through its own
`X-Forwarded-For`, whether it connects directly or through the proxy, because
its own address is trusted too. Setting `trusted_proxies` to the proxy's own
address closes this.
address comes from `X-Forwarded-For` only when the address pixa sees for
requests that come through the proxy is in `trusted_proxies`; otherwise all
users behind the proxy are counted as one client. That address is not always
the proxy's own: a proxy on the Docker host that connects to pixa over
`127.0.0.1` is seen as the gateway of the container's Docker network, such as
`172.17.0.1` on the default bridge, and one that connects through another of the
host's addresses is seen with that address. To be sure, read it as `remoteIP` in
pixa's request log while it is not in `trusted_proxies` (see `trusted_proxies`
under Configuration). With the default `trusted_proxies` (the RFC 1918 ranges),
a client with a private address can choose the address it is counted by through
its own `X-Forwarded-For`, whether it connects directly or through the proxy,
because its own address is trusted too. Setting `trusted_proxies` to only the
address pixa sees for requests that come through the proxy closes this.
### Encrypted URLs
An encrypted URL is an image URL made on pixa's own web page by someone who
knows the signing key. It works for any upstream host, allowlisted or not,
without a signature, and whoever gets it can neither read the source URL from it
nor change what it asks for.
1. Open `/` in a browser over HTTPS (or over plain HTTP while `debug` is on, see
Routes) and log in with the signing key (`signing_key`). The login session
lasts 30 days, or until `/logout`.
2. On the generator page, give the source image's URL, the width and height, the
format, quality and fit, and how long the URL lasts, then submit the form
(`POST /generate`). Width and height both empty or `0` keep the original
size; if only one of them is empty or `0`, that side is scaled to keep the
image's proportions.
3. The page shows the URL, `https://<host>/v1/e/<token>/img.<format>`, and when
it expires. `<host>` is the host the page was opened on, and the URL starts
with `http` instead while `debug` is on. The name after the token is ignored
and only gives the URL a file extension, `jpg` for `orig`.
The token holds the source's host, path and query and the size, format,
quality, fit and expiry, encrypted with a key derived from `signing_key`. The
source URL's scheme is not kept: the image is fetched like any other (see
Routes), and the blocked networks still apply.
How long the URL lasts is chosen on the page, from 1 minute to 1 year, or
never. The expiry is fixed in the token when the URL is made and cannot be
changed or revoked afterwards. Until then the image is served with a `max-age`
that ends at the expiry (see Routes); after it the URL answers 410
`URL has expired`. A URL made to last forever stops working only when
`signing_key` changes: changing it makes every encrypted URL already handed out
answer 400, and ends every login session.
### Image Metadata
@@ -152,7 +352,8 @@ Where:
- `query` — source query string, empty string if none
- `width` — requested width in pixels, `0` for original
- `height` — requested height in pixels, `0` for original
- `format` — output format (jpeg, png, webp, avif, gif, orig)
- `format` — output format, one of those listed under Routes, with `original`
signed as `orig` and `jpg` as `jpeg`
- `expiration` — the URL's `exp` query parameter, the Unix timestamp when
the signature expires; a request whose `exp` is not a whole number, an
empty `exp=` included, is refused with 400
@@ -163,19 +364,27 @@ Where:
outside), or `cover` when the URL has no `fit`; a request whose `fit` is
anything else, an empty `fit=` included, is refused with 400
**Example:** resize `https://cdn.example.com/photos/cat.jpg` to 800x600
WebP with expiration 1704067200, default quality and fit:
The URL's `sig` is the HMAC-SHA256 result in base64url (the URL-safe alphabet
of RFC 4648) with the trailing `=` padding kept, 44 characters in all. pixa
compares it exactly, so a signature encoded without padding, as Node's
`base64url` and Go's `base64.RawURLEncoding` do, is refused with 401.
**Example:** with the signing key `example-signing-key-for-documentation`,
resize `https://cdn.example.com/photos/cat.jpg` to 800x600 WebP with
expiration 1704067200, default quality and fit:
1. Build input:
`cdn.example.com:/photos/cat.jpg::800:600:webp:1704067200:85:cover`
2. Compute HMAC-SHA256 with your secret key
3. Base64URL-encode the result
2. Compute HMAC-SHA256 of it with the signing key
3. Base64URL-encode the result, keeping the `=` padding:
`-ay7KHpfqmtIGbibDGbUuBDkymi-Ymdn0NkC6j5EJag=`
4. URL:
`/v1/image/cdn.example.com/photos/cat.jpg/800x600.webp?sig=<base64url>&exp=1704067200`
`/v1/image/cdn.example.com/photos/cat.jpg/800x600.webp?sig=-ay7KHpfqmtIGbibDGbUuBDkymi-Ymdn0NkC6j5EJag=&exp=1704067200`
For the same image at quality 40 with fit `contain`, the input ends in
`:40:contain` and the URL is
`/v1/image/cdn.example.com/photos/cat.jpg/800x600.webp?sig=<base64url>&exp=1704067200&q=40&fit=contain`.
`:40:contain`, the signature is `5IwXUx6vf7yefhaUvFzgXZvG2o0Df4RJxPTK3pKq5VU=`,
and the URL is
`/v1/image/cdn.example.com/photos/cat.jpg/800x600.webp?sig=5IwXUx6vf7yefhaUvFzgXZvG2o0Df4RJxPTK3pKq5VU=&exp=1704067200&q=40&fit=contain`.
**Allowlist patterns:**
@@ -200,27 +409,52 @@ startup naming it, as an unknown config key does. The one other accepted
name is `PIXA_CONFIG_PATH`, the config file's path (like `--config`). The
variables set by the file's `env:` section are checked the same way.
pixa reads at most one config file: the one given with `--config` (or `-c`),
otherwise the one `PIXA_CONFIG_PATH` names, otherwise the first of these that
pixa finds: `/etc/pixa/config.yml`, `/etc/pixa/config.yaml`,
`~/.config/pixa/config.yml`, `~/.config/pixa/config.yaml`, then `config.yml`
and `config.yaml` in the working directory. A named file that does not exist,
cannot be read or does not parse aborts startup. Of the files pixa looks for on
its own, only one that does not exist is passed over, without a message. One
that pixa cannot read or parse aborts startup, naming the file. So does one in a
directory pixa may not enter, whether or not it is there, since pixa cannot
tell. With no file, pixa uses the environment and the defaults.
| Variable | Config key | Meaning |
| ------------------------------------ | ------------------------------- | ---------------------------------------------------------------------------- |
| `PIXA_SIGNING_KEY` | `signing_key` | Required: secret for signed and encrypted URLs and login, 32+ characters |
| `PORT` | `port` | Port to listen on; default `8080` |
| `PIXA_STATE_DIR` | `state_dir` | Directory for the database and the disk cache; default `/var/lib/pixa` |
| `PIXA_DB_URL` | `db_url` | SQLite database URL; default `state.sqlite3` in the state directory |
| `PIXA_CACHE_MAX_BYTES` | `cache_max_bytes` | Disk cache limit in bytes; `0` disables it; default 75% of free space |
| `PIXA_CACHE_MAX_BYTES` | `cache_max_bytes` | Disk cache limit in bytes; `0` disables it; default 75% of (free + cached) |
| `PIXA_ALLOWLIST_HOSTS` | `allowlist_hosts` | Upstream hosts served without a signature |
| `PIXA_BLOCKED_NETWORKS` | `blocked_networks` | CIDR ranges never fetched from, on top of the built-in ones |
| `PIXA_TRUSTED_PROXIES` | `trusted_proxies` | CIDR ranges of proxies whose `X-Forwarded-For` is believed; default RFC 1918 |
| `PIXA_ALLOW_HTTP` | `allow_http` | Allow plain-HTTP upstreams, for testing only; default `false` |
| `PIXA_UPSTREAM_CONNECTIONS_PER_HOST` | `upstream_connections_per_host` | Concurrent connections per upstream host; default `20` |
| `PIXA_UPSTREAM_CONNECTIONS` | `upstream_connections` | Concurrent connections to all upstream hosts together; default `64` |
| `PIXA_MAX_CONCURRENT_PROCESSING` | `max_concurrent_processing` | Images processed at once; default the number of CPUs |
| `PIXA_UPSTREAM_FETCH_TIMEOUT` | `upstream_fetch_timeout` | Time allowed for one fetch from an upstream host; default `30s` |
| `PIXA_UPSTREAM_MAX_RESPONSE_SIZE` | `upstream_max_response_size` | Largest upstream response accepted, in bytes; default 50 MiB |
| `PIXA_DOWNSTREAM_TIMEOUT` | `downstream_timeout` | Time allowed for answering one client request; default `60s` |
| `PIXA_ACCESS_CONTROL_ALLOW_ORIGIN` | `access_control_allow_origin` | CORS origin allowed to read image responses: `*` or one origin; default `*` |
| `PIXA_METRICS_USERNAME` | `metrics.username` | Username for `/metrics`, which is served only when both are set |
| `PIXA_METRICS_PASSWORD` | `metrics.password` | Password for `/metrics`; set together with the username |
| `PIXA_SENTRY_DSN` | `sentry_dsn` | Sentry DSN for error reporting; empty disables it |
| `PIXA_DEBUG` | `debug` | Debug logging and plain-HTTP local development; default `false` |
| `PIXA_MAINTENANCE_MODE` | `maintenance_mode` | Maintenance flag reported by the health check; default `false` |
| `PIXA_MAINTENANCE_MODE` | `maintenance_mode` | Answer image requests with 503; the health check stays 200; default `false` |
Key settings in more detail:
- `access_control_allow_origin` — CORS origin
- `access_control_allow_origin` — the origin a browser lets read the responses
of the image routes, `/v1/image/` and `/v1/e/`, sent as the CORS
`Access-Control-Allow-Origin` header; no other route sends it. `*`, the
default, is any site; otherwise one `http` or `https` origin such as
`https://example.com`, whose host is a lowercase host name (letters,
digits, hyphens and dots, with a letter in its last part) or an IP address
(IPv6 in brackets, in its shortest form), with an optional port 1-65535
that has no leading zero and is not the scheme's default. Any other value,
including another scheme such as a browser extension's, aborts startup
- `allowlist_hosts` — list of allowed upstream hosts
- `blocked_networks` — list of CIDR ranges to refuse for SSRF protection,
added to the always-enforced built-in ranges (loopback, private,
@@ -237,17 +471,56 @@ Key settings in more detail:
`172.16.0.0/12`, `192.168.0.0/16`), since pixa is deployed behind a
proxy on a private network; an explicitly empty list (`[]`) trusts no
one, and an explicit list replaces the default. An invalid CIDR aborts
startup. Set this to your proxy's address range if it is not already
covered by the defaults
- `upstream_fetch_timeout` — timeout for origin requests
- `upstream_max_response_size` — max origin response size
- `downstream_timeout` — client response timeout
startup. Set this to the address pixa sees for requests that come through
your proxy, such as `172.17.0.1/32`, when the defaults do not cover it, or
to trust nothing else (see the login limit under Routes). For a proxy on
the Docker host that connects to pixa over `127.0.0.1`, that address is the
gateway of the container's Docker network (`172.17.0.1` on the default
bridge), not the proxy's own address; a proxy that connects through another of
the host's addresses is seen with that address. To be sure which address it
is, set this to `[]` (or `PIXA_TRUSTED_PROXIES` to empty), send a request
through the proxy, and read `remoteIP` in pixa's request log line for it
- `upstream_fetch_timeout` — time allowed for one fetch from an upstream
host, as a duration such as `30s` (the default) or `2m`
- `upstream_max_response_size` — largest upstream response accepted, in
bytes; default `52428800` (50 MiB). It also limits the image data pixa
decodes
- `downstream_timeout` — time allowed for answering one client request, as a
duration; default `60s`. The upstream fetch counts toward it, and so do the
waits for an upstream connection and for a processing slot (up to 10 seconds
each), so keep it longer than `upstream_fetch_timeout` plus 20 seconds
- `signing_key` — HMAC secret for URL signatures
- `db_url` — the SQLite database to open; omitted, it is
`file:<state_dir>/state.sqlite3?_pragma=journal_mode(WAL)`, which keeps the
database in WAL mode. pixa adds `_pragma=busy_timeout(5000)` to any `db_url`,
so a write that finds another in progress waits up to five seconds for it
instead of failing. WAL mode comes only from the URL: keep
`_pragma=journal_mode(WAL)` in one you set
- `cache_max_bytes` — disk cache size limit in bytes; `0` disables the
disk cache entirely; omitted defaults to 75% of the free space on
the filesystem containing `<state_dir>/cache/` (minimum 500 MiB)
disk cache entirely; omitted defaults to 75% of the sum of the free space on
the filesystem containing `<state_dir>/cache/` and the bytes of source and
transformed images the cache already holds, worked out at startup (minimum
500 MiB)
- `upstream_connections` — the most connections to upstream hosts at once, all
hosts together, on top of `upstream_connections_per_host`; default `64`. A
fetch holds its connection until its image has been processed. A fetch that
finds all of them in use waits up to 10 seconds for one to free up; if none
does, and `downstream_timeout` has not ended first, the request is answered
503 with the error `server busy, try again later`
- `max_concurrent_processing` — the most images decoded and encoded at once;
default the number of CPUs pixa can use (`GOMAXPROCS`), which follows a
container's CPU limit. A request that finds all of them in use waits up to 10
seconds for one to free up; if none does, and `downstream_timeout` has not
ended first, it is answered 503 the same way
- `maintenance_mode` — while `true`, the image routes (`/v1/image/` and
`/v1/e/`) answer every request for an image with 503, a `Retry-After` header
and a JSON error body. The health check (`/.well-known/healthcheck.json`)
still answers 200 and reports `"maintenance_mode": true`. It stays 200
because the image's Docker `HEALTHCHECK` requests it: a 503 there would make
the container unhealthy, and upaas marks a deploy failed when its container
is unhealthy. The login and URL generator pages and `/metrics` keep working
See `config.example.yml` for all options with defaults.
See `configs/config.example.yml` for all options with defaults.
### Architecture
@@ -256,7 +529,10 @@ See `config.example.yml` for all options with defaults.
- **Image processing**: govips (CGO wrapper for libvips)
- **Database**: SQLite via modernc.org/sqlite
- **Static assets**: embedded via `//go:embed`
- **Metrics**: Prometheus
- **Metrics**: Prometheus, at `/metrics`: generic HTTP request metrics
(duration, response size, requests in flight) and the Go runtime and process
metrics; requests are measured and `/metrics` is served only when
`metrics.username` and `metrics.password` are set
- **Logging**: stdlib slog
## Entrypoints
@@ -279,8 +555,9 @@ them. We provide:
- `script/check` — run test, lint, and fmt-check
- `script/docker` — build the Docker image tagged via `script/projectname`
- `script/docker-smoke` — build the image, start it, wait for it to be healthy
- `script/cibuild` — CI entrypoint: `docker build .` (the Dockerfile
runs the checks, so a green build implies a green repo)
- `script/cibuild` — CI entrypoint: `docker build .` with a new
`CHECK_EPOCH` on every run, so the Dockerfile's checks run instead of
coming from the build cache, and a green run implies a green repo
- `script/precommit` — pre-commit checks (`go mod tidy` guard, then
`script/check`)
- `script/install-precommit` — install the git pre-commit hook that
TODO.md
+320 -11
View File
@@ -3,6 +3,8 @@
* branch per issue from `next`
* do the work in Next Step
* move Next Step to the top of Completed Steps
* `TODO.md` merges with git's union merge (`.gitattributes`), which never
reports a conflict: read the merged entries after every merge or rebase
* move the top item of Future Steps into Next Step
* commit (`TODO.md` changes in the same commit as the work)
* open a PR based on `next`
@@ -25,11 +27,327 @@ The disk cache is now size-bounded with LRU eviction
# Next Step
P1: rate limit global concurrent upstream fetches to prevent resource
exhaustion
P2: security: referer blacklist
# Completed Steps
- 2026-10-04 an integration test of the image proxy flow (closes #80):
`TestImageProxyFlow` in `internal/server` starts the database, handlers and
middleware from the constructors `pixad` uses, with a fresh state directory,
and replaces only the upstream origin with a local test server. For a resize
with a change to JPEG and for `orig`, the first request goes through the
router, the real fetcher, libvips, the disk cache and SQLite and answers 200
with the right content type and size and `X-Pixa-Cache: MISS`; the second
answers `HIT` with the same image and the upstream has had one request; the
source and the converted image are then in `cache/sources` and
`cache/variants`, with their rows in `source_content`, `source_metadata` and
`variant_content`. Two optional fields make this possible, which `pixad` does
not set and the config file and environment cannot:
`httpfetcher.Config.DialContext` connects in place of the dialer that refuses
internal addresses, the URL and redirect checks still running, and
`handlers.Params.Fetcher` replaces the fetcher the handlers build.
- 2026-10-04 fewer files in the repository root (closes #97):
`config.example.yml` moved unchanged to `configs/config.example.yml`, and
`README.md`, the comments in `internal/config/config.go` and the startup error
for the placeholder signing key name the new path; `scripts/manual-test.sh`
and its directory are deleted, as the handler tests in `internal/handlers`
cover every check it made except two: fetching a real image from the
internet, and a URL made on the generator page with a `ttl` answering 410 once
the `ttl` has passed (https://git.eeqj.de/sneak/pixa/issues/199);
`CONVENTIONS.md` is deleted, as `REPO_POLICIES.md` links the canonical Go HTTP
server conventions.
- 2026-10-04 SQLite writes no longer fail with "database is locked" (closes
#198): pixa adds `_pragma=busy_timeout(5000)` to every `db_url`, so a write
that finds another in progress on another connection waits up to five seconds
for it, and the default `db_url` turns on WAL mode with
`_pragma=journal_mode(WAL)`. The old default's `_journal_mode=WAL` is not a
parameter the driver reads, so the database was never in WAL mode.
- 2026-10-04 `TestPeriodicReconciliationAdoptsFileThatAppearsAfterStartup`
only passes through a periodic pass (closes #189): it slept for three
eviction intervals before writing its file, and a startup pass still running
then could adopt the file itself. It now holds the test database's only
connection until the startup pass waits for it after walking the empty
variant directory, writes the file and lets the connection go, as
`TestEvictionRunsOnPeriodicSchedule` does, so only a periodic reconciliation
pass can adopt the file. Test only.
- 2026-10-04 logging in, logging out, the URL generator and `/v1/e/` have
handler tests (closes #77): new tests in `internal/handlers`, with no
network, check that `GET /` without a login session shows the login form; a
wrong key shows it again with an error and sets no session cookie; the right
key answers 303 to `/` with a session cookie marked `Secure`, `HttpOnly` and
`SameSite=Strict`, with which `GET /` shows the generator page; `GET /logout`
answers 303 to `/` with an empty session cookie sent with `Max-Age=0`;
`POST /generate` without a login session answers 303 to `/`; `/v1/e/` serves
the image for a valid token, answers 410 for an expired one and 400 for one
with a character changed, cut short or made with another signing key; and a
URL made on the generator page is served by `/v1/e/`. No code changes.
- 2026-10-04 `TODO.md` merges with git's union merge (closes #190): a root
`.gitattributes`, copied from `sneak/prompts`, marks it `merge=union`, so two
branches that each add an entry at the top of Completed Steps merge without a
conflict and keep both entries. Git now never reports a conflict in
`TODO.md`: a real one keeps both versions of the lines, and two entries that
share an identical line can end up one inside the other, which a rebase can
do to an entry already on `next`. The Workflow above says to read the merged
entries after every merge or rebase.
- 2026-10-04 the default `cache_max_bytes` no longer shrinks as the cache fills
(closes #184): for an omitted key, the cache works out the limit when it
opens, after the database is open, as 75% of the sum of the free space on the
filesystem containing `<state_dir>/cache/` and what the cache already holds by
its own size accounting, at least 500 MiB, so a cache filled to its limit
keeps that limit across a restart. The computation and its tests moved from
`internal/config` to `internal/imgcache`; the config only records whether the
key was set.
- 2026-10-04 `TestEvictionRunsOnPeriodicSchedule` no longer races the evictor
(closes #183): it wrote each variant file and then inserted its accounting row
by hand, and a reconciliation pass between the two adopted the file first, so
the insert failed. It now writes the files only, while holding the test
database's only connection so the evictor's startup pass waits after walking
the empty variant directory; a periodic reconciliation pass then adopts the
files and the eviction pass after it evicts them. No other test in
`internal/imgcache` inserts a row by hand after starting the evictor. Test
only.
- 2026-10-04 a config file pixa cannot read aborts startup (closes #176): of the
places pixa looks for its config file on its own, only one where the file does
not exist is passed over; any other error, such as a directory on the path
that pixa may not enter, aborts startup naming the file, as a file that does
not parse already did.
- 2026-10-04 `.golangci.yml` re-vendored from the canonical copy (closes #57):
the deprecated `gomodguard` is switched off, so lint runs print no
deprecation warning; its successor `gomodguard_v2` runs with the shared
module block list, and `depguard` keeps `net/http/httptest` out of files that
are not tests. The tree needed no code changes.
- 2026-10-04 the Content-Security-Policy allows no inline script or style
(closes #125): `script-src` and `style-src` are `'self'` only. The generator
page's two inline `onclick` handlers moved into
`internal/static/generator.js`, attached with `addEventListener`; the bundled
Tailwind script, which built styles in the browser, is replaced by a small
hand-written `internal/static/style.css` with only the rules the login and
generator pages use, the templates carrying a few plain class names in place
of Tailwind's. No build step. The pages keep their layout, not every pixel of
it.
- 2026-10-04 deployment guide and example Caddy config (closes #89):
"Deployment" in `README.md` says what the reverse proxy in front of pixa must
do (terminate TLS; pass `Host`, `Origin` and `Referer` on unchanged; set
`X-Forwarded-For`, with `trusted_proxies` to match; wait at least
`downstream_timeout`; optionally refuse `/metrics`) and what pixa does itself,
that the state directory needs a persistent volume and what `cache_max_bytes`
counts, the health check for a load balancer, what a stop does and its exit
codes, and what running outside Docker needs; `configs/Caddyfile` is the
example, checked with `caddy validate`.
- 2026-10-04 the metrics basic auth, CORS preflight, request logging and
metrics recording have tests (closes #79): `MetricsAuth` on its own answers
401 with a challenge without credentials or with a wrong username or password
and lets the configured ones through; a preflight request gets `*` for any
origin when `access_control_allow_origin` is `*` and no
`Access-Control-Allow-Origin` from another origin than the configured one; a
`POST /` carrying the signing key leaves no trace of it in the request log
line, and the login handler's own log lines leave out the submitted key; the
metrics middleware on its own records a request it served, and the router
records nothing while no metrics username is set. Not tested: that the router
puts the basic auth in front of `/metrics` and records requests when a
metrics username is set. Only one test per package can set up `/metrics`, and
in `internal/server` that is `TestMaintenanceModeKeepsOtherRoutes`, which
needs the owner's approval to change; #180 holds it. Tests only; the basic
auth library already compares the password in constant time.
- 2026-10-04 the image route's signature check and error answers are tested
(closes #76): new tests in `internal/handlers`, with no network, check the
status and JSON error body for a missing, wrong, unpadded, upper-case or
expired signature on a host not on the allowlist, or a valid one sent for
its parent domain, a sibling host, a subdomain or the host with another
domain appended (401), an unparseable path (400), `localhost` as the
upstream host (403) and an upstream error (502); that an allowlisted host is
served without a signature, another host only with a valid one; and the
answers of `/robots.txt` and the health check. No code changes.
- 2026-10-04 request IDs returned and passed on, and `/v1/e/` revalidates
(closes #84): pixa's own `RequestID` middleware, in place of chi's, gives each
request an ID, its own `X-Request-ID` when that is at most 64 letters, digits,
`-`, `_` or `.` and a random one otherwise, stores it where chi's did and
sends it back as `X-Request-ID` on every response; the upstream fetch sends
that ID, and the "upstream fetched", "image converted" and "image served" log
lines carry it as `request_id`, a fetch shared by several requests carrying
the first request's; `/v1/e/` sets `ETag`, answers a matching `If-None-Match`
with 304 and is routed for `HEAD`, the `ETag` and 304 code being
`notModified`, which `/v1/image/` calls too; its token checks moved unchanged
into `parseImageEncRequest` to keep `HandleImageEnc` within the line limit; no
`Vary` is added, as no response depends on a request header except the image
routes' CORS headers, for which `go-chi/cors` already sends `Vary: Origin`;
`Vary: Accept` is left to #88.
- 2026-10-04 routes, encrypted URLs and config file documented (closes #75):
"Routes" in `README.md` lists every route with its method, purpose, what it
needs and the status codes it answers with, and says `q` and `fit` are part
of what is cached; "Encrypted URLs" covers logging in, making one on the
generator page, how long it lasts and the 410 once it has expired;
"Configuration" gives the order in which pixa looks for its config file;
`config.example.yml` lists `db_url` and `env` and gives every key's default;
`scripts/manual-test.sh` is left to #97.
- 2026-10-04 shutdown stops cache eviction in progress (closes #102):
`StartEviction` runs the eviction goroutine with its own context, which
`StopEviction` cancels, so a pass in progress stops at its next database
call, file, row or eviction candidate instead of running to completion, and
no pass starts after it, so a stop logs at most one warning;
`StopEviction` takes a context and, when that context ends before the
goroutine exits, stops waiting and returns its error; the handlers' stop hook
passes fx's stop context, so an eviction still running when fx's stop
deadline ends fails the stop and makes the exit code 1.
- 2026-10-04 dead code in `internal/imgcache` is gone (closes #73): `Purge`,
which only returned an error and which nothing called, is no longer part of
the `ImageCache` interface or `Service`; the `SignatureValidator`,
`Allowlist` and `Storage` interfaces, which nothing implemented or used, are
deleted. Nothing else changes.
- 2026-10-04 upstream host semaphores and variant `.meta` files no longer
outlive their use (closes #87): the fetcher counts the fetches holding or
waiting for a slot of each upstream host's semaphore and removes the host's
semaphore once none is left, so fetches from many hosts no longer leave one
semaphore each until restart; `VariantStorage.Delete` removes the variant's
`.meta` file along with it, a missing `.meta` file not being an error, and
`DeleteWithMeta`, which eviction called for that, is gone.
- 2026-10-04 `README.md` matches the code (closes #74): "Storage" names the
cache directories pixa uses (`cache/sources`, `cache/metadata`,
`cache/variants`) and how files are named in each, and the comments in
`001_schema.sql` name the same paths; the routes and the signature section
list the same output formats, `jpg` and `original` included; the TLS
sentence names `allow_http` as its exception; "Metrics" says only generic
HTTP and Go runtime metrics exist, measured and served only when the metrics
username and password are set.
- 2026-10-03 shutdown sets the exit code and waits for image processing
(closes #86): fx alone handles SIGINT and SIGTERM, and the server's own
signal handler is gone; fx's `Run` in `cmd/pixad` exits with the shutdown's
code: 0 for a signal, 1 when the HTTP server cannot listen or the app fails
to start or to stop; the server's stop hook, which fx waits for, stops the
HTTP server, waits for the images still being processed, both within 5
seconds, then flushes Sentry; images still being processed after that are
logged with their count and make the exit code 1; a Sentry DSN that cannot be
used fails startup, so the stop hooks of what had already started run,
instead of exiting the process from a goroutine; the eviction loop is left to
#102.
- 2026-10-03 every `script/cibuild` and `script/docker` run executes the checks
(closes #101): the `Dockerfile` declares `CHECK_EPOCH` above `make fmt-check`
and `make lint` in the lint stage and above `make test` in the build stage,
and each of those steps names it in its command; both scripts pass a new value
on every run, so Docker runs the checks instead of reusing cached results,
while the `script/bootstrap` steps stay cached; a plain `docker build .` still
works, leaves it empty, and reuses the check steps only for an identical build
context; the `script/cibuild` comment and `README.md` no longer say that any
successful build implies a green repo.
- 2026-09-29 share concurrent misses (closes #65): requests that miss the same
variant at once (the same cache key, so quality and fit included) share one
upstream fetch or cached source read and one transcode through
`golang.org/x/sync/singleflight`; the first request's processing ignores its
cancellation but keeps its deadline, and the others wait for its image or
error holding no upstream connection or processing slot, and stop waiting
when their own context ends; the request doing the processing waits for it
even then, up to its deadline; a request whose context has already ended
starts nothing; each request counts one miss, and the processing counts its
fetch and transcode once; a panic while processing is reported to Sentry when
`sentry_dsn` is set and becomes an error for every waiting request instead of
stopping pixad; documented in `README.md`.
- 2026-09-29 only the image routes send CORS headers (closes #98): the CORS
middleware, with the `access_control_allow_origin` origin, moved from the
router root onto a `/v1` subrouter holding `/v1/image/` and `/v1/e/`, where it
still answers a preflight `OPTIONS` request; the login and URL generator
pages, `/metrics` and the other routes send no `Access-Control-Allow-Origin`;
documented in `README.md` and `config.example.yml`.
- 2026-10-02 a plain `docker build .` stamps the tag or short commit, not
`dev` (closes #166): `.dockerignore` lets `.git` into the build context,
without `.git/config`; with no `VERSION` build argument the `Dockerfile`
takes the version from `git describe --tags --always`, and fails the build if
the context carries `.git` and no version comes out; `ARG VERSION` has no
default; pixad logs its version, with its name and architecture, as its first
log line at startup.
- 2026-09-29 the container makes `/var/lib/pixa` usable by itself (closes
#159): `deploy/docker-entrypoint.sh` creates the directory if it is missing,
gives the directory and everything in it to `pixad` when the directory or one
of its top-level entries belongs to another user or group, sets its mode to
`750`, then runs the server as `pixad`; data left by an earlier run under
another uid is taken over this way; "Running under upaas" in `README.md` no
longer tells the operator to create or chown the host directory.
- 2026-09-29 variant content types kept in memory (closes #70):
`Cache.metaCache` holds the content types of up to 10,000 variants in an LRU
(`github.com/hashicorp/golang-lru/v2`), filled by `StoreVariant` and by
`GetVariant` after it reads a `.meta` file, where a type `StoreVariant` added
meanwhile is kept over the one read, and never with the
`application/octet-stream` served for a variant without one; for a variant it
holds, `GetVariant` skips the `.meta` read, still opening the variant file and
taking the size from it; eviction removes the entry before deleting the files,
and `GetVariant` removes it when the file will not open; the cap is a
constant, not a setting; the unused `variantMeta` type is gone; `README.md`
describes it.
- 2026-09-29 maintenance mode refuses image requests (closes #71): while
`maintenance_mode` is on, `/v1/image/` and `/v1/e/` answer 503 with a
`Retry-After` header and the JSON error body, from one middleware in
`internal/server/routes.go`; the health check stays 200 and reports
`maintenance_mode`, as the image's Docker `HEALTHCHECK` requests it and upaas
marks a deploy failed when its container is unhealthy; the login and URL
generator pages and `/metrics` keep working; documented in `README.md` and
`config.example.yml`.
- 2026-09-29 bound concurrent image processing and upstream fetches (closes
#64): `max_concurrent_processing` (default the number of CPUs pixa can use)
limits the images decoded and encoded at once, and `upstream_connections`
(default 64) the connections to all upstream hosts together, on top of
`upstream_connections_per_host`; a fetch holds its connection until its image
has been processed, and a request whose source is cached reads it only once it
has a processing slot; a request that finds either limit reached waits up to
10 seconds for a free one, then gets 503 `server busy, try again later`;
libvips runs one worker thread per image with its operation cache off;
documented in `README.md` and `config.example.yml`.
- 2026-09-29 Dockerfiles install through `script/bootstrap` (closes #95): the
`Dockerfile` lint and build stages and `Dockerfile.lint` copy `script/`,
`go.mod` and `go.sum`, then run `script/bootstrap` in place of their own
`apk add` lines, so the build dependencies are listed in one place;
`script/bootstrap` now also installs a C compiler when `gcc` is missing; the
build uses `-trimpath` and `-s -w` and keeps `CGO_ENABLED=1` for govips;
`ARG VERSION` sits just above the build, so a new version reruns neither
`script/bootstrap` nor the tests.
- 2026-09-29 migrations at the path `REPO_POLICIES.md` sets (closes #96): the
migration files moved, contents unchanged, from `internal/database/schema/`
to `internal/db/migrations/` as `000_migration.sql` and `001_schema.sql`; the
`internal/db/migrations` package embeds them and `internal/database` reads
them through its `FS()`; the `internal/database` package itself stays; the
version still comes from the filename prefix, so a database that has recorded
versions 0 and 1 runs neither again.
- 2026-09-29 `trusted_proxies` advice and signature padding in `README.md`
(closes #150): the login-limit paragraph, the `trusted_proxies` entry and
`config.example.yml` say to set `trusted_proxies` to the address pixa sees for
requests that come through the proxy, which the request log shows as
`remoteIP` while it is not trusted; for a proxy on the Docker host that
connects over `127.0.0.1` that is the Docker network's gateway, not the
proxy's own address; the signature section says `sig` is base64url with the
`=` padding kept, and gives the example's `sig` for a stated signing key.
- 2026-09-29 fixed uid and gid for `pixad` (closes #151): the image creates the
`pixad` group with gid 65532 and the `pixad` user with uid 65532, instead of
the first free uid 1000, so a bind-mounted `/var/lib/pixa` given to `pixad`
is not owned on the host by a person's login account; the first-run step of
"Running under upaas" in `README.md` names the uid and gid.
- 2026-09-29 `max-age` never outlives an expiring URL (closes #63): both image
routes build `Cache-Control` from the request's `Expires`, which an encrypted
URL's expiry now fills too; `max-age` is one year, or the whole seconds left
until the `exp` of a `/v1/image/` URL or the expiry of an encrypted URL when
that is sooner, never negative; an allowlisted host's URL that has an `exp`
follows it too; `immutable` stays, as freshness now ends at the expiry;
documented in `README.md`.
- 2026-09-28 add the four settings `README.md` documented but pixa did not
have, which aborted startup as unknown keys (closes #61):
`access_control_allow_origin` (default `*`, the CORS origin),
`upstream_fetch_timeout` (default `30s`), `upstream_max_response_size`
(default 50 MiB) and `downstream_timeout` (default `60s`, both the
server's write timeout and the per-request timeout); each has a
`PIXA_` variable; durations are positive Go duration strings, the size a
whole number of bytes up to 1 GiB, the origin `*` or one `http` or
`https` origin as `README.md` describes it; an invalid value
aborts startup naming the key and the value; documented in
`config.example.yml` and `README.md`.
- 2026-09-28 cache stats report real numbers (closes #56): `Cache.Stats`
counts the cached source images and processed variants (`source_content`
plus `variant_content`) and takes their size from `Cache.UsageBytes`,
instead of reading `request_cache` and `output_content`, which nothing
writes; those two tables are left in the schema; a disabled disk cache
reports no items and no size. A hit is counted even when the request
context has ended. A miss is counted after it is served or fails, also
when the request context has ended by then, with the bytes it read from
upstream, so `upstream_fetch_count` and `upstream_fetch_bytes` move,
including for an upstream body that fails partway or a fetched source
that then fails the magic byte check; `transform_count` counts each image
the image processor transcodes.
- 2026-09-28 strip metadata from processed images (closes #82): every output is
exported with govips' `StripMetadata`, so it carries no EXIF, XMP, IPTC or ICC
profile; the image is first turned upright with `AutoRotate` (before sizes are
@@ -258,25 +576,16 @@ exhaustion
# Future Steps
- P2: security
- referer blacklist
- per-IP rate limiting on the image routes
- per-origin rate limiting
- P2: HTTP response handling
- Last-Modified headers
- Vary header for content negotiation
- X-Request-ID propagation
- P2: auto format selection (format=auto based on Accept header)
- P2: configuration
- add all configuration options from README
- YAML config file support
- P2: operational
- optional Sentry error reporting
- comprehensive request logging
- Prometheus performance metrics
- integration tests for the image proxy flow
- load tests to verify the 1k to 5k req/s target
- P2: documentation
- configuration options
- API endpoints
- deployment guide
- example nginx or caddy reverse proxy config
cmd/pixad/main.go
+9 -1
View File
@@ -4,6 +4,8 @@ package main
import (
"fmt"
"os"
"os/signal"
"syscall"
"github.com/spf13/cobra"
"go.uber.org/fx"
@@ -45,6 +47,9 @@ func run(_ *cobra.Command, _ []string) {
_ = os.Setenv("PIXA_CONFIG_PATH", configPath)
}
// A write to a closed stdout or stderr must not end the process.
signal.Ignore(syscall.SIGPIPE)
fx.New(
fx.Provide(
config.New,
@@ -56,6 +61,9 @@ func run(_ *cobra.Command, _ []string) {
middleware.New,
healthcheck.New,
),
fx.Invoke(func(*server.Server) {}),
fx.Invoke(
func(log *logger.Logger) { log.Identify() },
func(*server.Server) {},
),
).Run()
}
config.example.yml
-77
View File
@@ -1,77 +0,0 @@
# Pixa Example Configuration
#
# Every key can also be set by an environment variable, which wins over
# this file: PIXA_ plus the key in upper case, with "." written as "_"
# (state_dir is PIXA_STATE_DIR, metrics.username is
# PIXA_METRICS_USERNAME). The one exception is port, which is set by
# PORT. In a variable, a list is comma-separated. A variable named in
# this file's env: section is set while the file loads, so it overrides
# both the environment the process was started with and this file's own
# key.
# Server settings
port: 8080
debug: false
maintenance_mode: false
# Data directory for SQLite database and cache files
state_dir: ./data
# Image proxy settings
# HMAC signing key for URL signatures (required, at least 32 characters)
# Generate with: openssl rand -base64 32
signing_key: "CHANGE_ME_generate_with_openssl_rand_base64_32"
# Hosts that don't require signatures
# Use "." prefix for wildcard subdomain matching (e.g., ".example.com" matches "cdn.example.com")
allowlist_hosts:
- s3.sneak.cloud
- static.sneak.cloud
- sneak.berlin
- github.com
- user-images.githubusercontent.com
# Additional CIDR ranges to refuse when fetching upstream, extending the
# SSRF protection. These are added to the always-enforced built-in ranges
# (loopback, RFC 1918 private, link-local, CGNAT, benchmark, NAT64, and
# similar), never replacing them. Each entry must be a valid CIDR in IPv4
# or IPv6 form; an invalid entry aborts startup.
# blocked_networks:
# - 100.64.0.0/10
# - 2001:db8::/32
# CIDR ranges of the reverse proxies in front of pixa. X-Forwarded-For
# is believed only when the direct peer is inside one of these ranges;
# the client address in the access log and login records is then the
# rightmost forwarded entry that is not itself a trusted proxy. A client
# connecting directly (peer outside these ranges) cannot spoof its
# address: the header is ignored and the peer address is used. When
# omitted, this defaults to the RFC 1918 private ranges (10.0.0.0/8,
# 172.16.0.0/12, 192.168.0.0/16), since pixa is deployed behind a proxy on
# a private network. An explicitly empty list ([]) trusts no one; an
# explicit list replaces the default. An invalid CIDR aborts startup.
# Uncomment to override the defaults with your proxy's address range.
# trusted_proxies:
# - 10.0.0.0/8
# - 2001:db8::/32
# Allow HTTP upstream (only for testing, always use HTTPS in production)
allow_http: false
# Maximum concurrent connections per upstream host (default: 20)
upstream_connections_per_host: 20
# Maximum disk cache size in bytes. Explicit values are used exactly as
# given; 0 disables the disk cache entirely (every request fetches and
# processes uncached). When omitted, the default is 75% of the free
# space on the filesystem containing <state_dir>/cache/ at startup,
# with a minimum of 500 MiB.
# cache_max_bytes: 10737418240
# Sentry error reporting (optional)
sentry_dsn: ""
# Metrics endpoint authentication (optional)
# metrics:
# username: "admin"
# password: "secret"
configs/Caddyfile
+17
View File
@@ -0,0 +1,17 @@
# Example Caddy config for running pixa behind Caddy; see "Deployment" in
# README.md. Replace images.example.com with pixa's public host name, and
# 127.0.0.1:8080 with the address Caddy reaches pixa on.
#
# Caddy gets and renews the TLS certificate for the host name, passes the
# Host, Origin and Referer headers on unchanged, sets X-Forwarded-For to the
# client's address, and waits for pixa's answer with no time limit of its
# own, so pixa's downstream_timeout is what ends a slow request.
images.example.com
# pixa asks for metrics.username and metrics.password on /metrics. This
# line also keeps it off the public address, for a scraper that reaches
# pixa directly; remove it to read /metrics through Caddy.
respond /metrics 404
reverse_proxy 127.0.0.1:8080
configs/config.example.yml
+150
View File
@@ -0,0 +1,150 @@
# Pixa Example Configuration
#
# Every key can also be set by an environment variable, which wins over
# this file: PIXA_ plus the key in upper case, with "." written as "_"
# (state_dir is PIXA_STATE_DIR, metrics.username is
# PIXA_METRICS_USERNAME). The one exception is port, which is set by
# PORT. In a variable, a list is comma-separated. A variable named in
# this file's env: section is set while the file loads, so it overrides
# both the environment the process was started with and this file's own
# key.
#
# Durations are Go duration strings such as 30s or 2m and must be
# positive; a bare number has no unit and aborts startup. Sizes are a
# whole number of bytes.
#
# A key left out takes the default its comment gives.
# Port to listen on (default: 8080)
port: 8080
# Debug logging and plain-HTTP local development (default: false)
debug: false
# While true, the image routes (/v1/image/ and /v1/e/) answer every request
# for an image with 503 and a Retry-After header. The health check keeps
# answering 200 and reports maintenance_mode as true. It stays 200 because
# the image's Docker HEALTHCHECK requests it: a 503 there would make the
# container unhealthy, and upaas marks a deploy failed when its container is
# unhealthy. (default: false)
maintenance_mode: false
# Data directory for SQLite database and cache files
# (default: /var/lib/pixa)
state_dir: ./data
# SQLite database URL (default:
# file:<state_dir>/state.sqlite3?_pragma=journal_mode(WAL)). pixa adds
# _pragma=busy_timeout(5000) to it. An empty value aborts startup; leave the
# key out to use the default.
# db_url: "file:./data/state.sqlite3?_pragma=journal_mode(WAL)"
# Image proxy settings
# HMAC signing key for URL signatures (required, at least 32 characters)
# Generate with: openssl rand -base64 32
signing_key: "CHANGE_ME_generate_with_openssl_rand_base64_32"
# Hosts that don't require signatures (default: none)
# Use "." prefix for wildcard subdomain matching (e.g., ".example.com" matches "cdn.example.com")
allowlist_hosts:
- s3.sneak.cloud
- static.sneak.cloud
- sneak.berlin
- github.com
- user-images.githubusercontent.com
# Additional CIDR ranges to refuse when fetching upstream, extending the
# SSRF protection. These are added to the always-enforced built-in ranges
# (loopback, RFC 1918 private, link-local, CGNAT, benchmark, NAT64, and
# similar), never replacing them. Each entry must be a valid CIDR in IPv4
# or IPv6 form; an invalid entry aborts startup. (default: none)
# blocked_networks:
# - 100.64.0.0/10
# - 2001:db8::/32
# CIDR ranges of the reverse proxies in front of pixa. X-Forwarded-For
# is believed only when the direct peer is inside one of these ranges;
# the client address in the access log and login records is then the
# rightmost forwarded entry that is not itself a trusted proxy. A client
# connecting directly (peer outside these ranges) cannot spoof its
# address: the header is ignored and the peer address is used. When
# omitted, this defaults to the RFC 1918 private ranges (10.0.0.0/8,
# 172.16.0.0/12, 192.168.0.0/16), since pixa is deployed behind a proxy on
# a private network. An explicitly empty list ([]) trusts no one; an
# explicit list replaces the default. An invalid CIDR aborts startup.
# Uncomment to override the defaults with the address pixa sees for
# requests that come through your proxy. That is not always the proxy's own
# address: a proxy on the Docker host that connects over 127.0.0.1 is seen
# as the gateway of the container's Docker network (172.17.0.1 on the
# default bridge), and one that connects through another host address is
# seen with that address. To be sure, look it up in the request log as the
# trusted_proxies entry in README.md describes.
# trusted_proxies:
# - 10.0.0.0/8
# - 2001:db8::/32
# Allow HTTP upstream (only for testing, always use HTTPS in production)
# (default: false)
allow_http: false
# Maximum concurrent connections per upstream host (default: 20)
upstream_connections_per_host: 20
# Maximum concurrent connections to all upstream hosts together, on top of
# the per-host limit (default: 64). A fetch holds its connection until its
# image has been processed. A fetch that finds none free waits up to 10
# seconds for one, and if none frees up the request is answered 503, unless
# downstream_timeout has ended first.
upstream_connections: 64
# Maximum number of images decoded and encoded at once (default: the
# number of CPUs pixa can use, which follows a container's CPU limit). A
# request that finds none free waits up to 10 seconds for one, and if none
# frees up it is answered 503, unless downstream_timeout has ended first.
# max_concurrent_processing: 4
# Time allowed for one fetch from an upstream host (default: 30s)
upstream_fetch_timeout: 30s
# Largest upstream response accepted, in bytes, at most 1073741824
# (1 GiB) (default: 52428800, 50 MiB)
upstream_max_response_size: 52428800
# Time allowed for answering one client request (default: 60s). The
# upstream fetch counts toward it, and so do the waits for an upstream
# connection and for a processing slot (up to 10 seconds each), so keep it
# longer than upstream_fetch_timeout plus 20 seconds.
downstream_timeout: 60s
# The origin a browser lets read the responses of the image routes,
# /v1/image/ and /v1/e/, sent as the CORS Access-Control-Allow-Origin
# header; no other route sends it. "*" (the default) is any site;
# otherwise one http or https origin such as https://example.com, whose
# host is a lowercase host name (letters, digits, hyphens and dots, with a
# letter in its last part) or an IP address (IPv6 in brackets, in its
# shortest form), with an optional port 1-65535 that has no leading zero
# and is not the scheme's default. Any other value, including another
# scheme such as a browser extension's, aborts startup.
access_control_allow_origin: "*"
# Maximum disk cache size in bytes. Explicit values are used exactly as
# given; 0 disables the disk cache entirely (every request fetches and
# processes uncached). When omitted, the default is 75% of the sum of
# the free space on the filesystem containing <state_dir>/cache/ and
# the bytes of images the cache already holds, worked out at startup,
# with a minimum of 500 MiB.
# cache_max_bytes: 10737418240
# Sentry DSN for error reporting (default: empty, which turns it off)
sentry_dsn: ""
# Username and password for /metrics, set together (default: unset). Metrics
# are measured and /metrics is served only when both are set.
# metrics:
# username: "admin"
# password: "secret"
# Environment variables set while this file loads, as described at the top
# (default: none)
# env:
# PIXA_DEBUG: "true"
deploy/docker-entrypoint.sh
+13 -5
View File
@@ -1,14 +1,22 @@
#!/bin/sh
# deploy/docker-entrypoint.sh: the Docker image's ENTRYPOINT. It runs as
# root only to give /var/lib/pixa to pixad: a host directory
# bind-mounted there keeps its host owner, often root, and pixad could
# not write to it. The server itself always runs as pixad.
# root only to make /var/lib/pixa usable by pixad: a host directory
# bind-mounted there keeps its host owner, often root, and data from an
# earlier run may belong to another uid. The server itself always runs
# as pixad.
set -eu
main() {
if [ "$(stat -c %U /var/lib/pixa)" != pixad ]; then
chown pixad:pixad /var/lib/pixa
mkdir -p /var/lib/pixa
# Only the directory and its top-level entries are checked, so a
# normal start does not walk the cache. -depth gives each directory
# to pixad after its contents, so a start stopped part way leaves
# something at the top for the next start to find; -h changes a
# symlink itself, never the file it points to.
if [ -n "$(find /var/lib/pixa -maxdepth 1 \( ! -user pixad -o ! -group pixad \))" ]; then
find /var/lib/pixa -depth -exec chown -h pixad:pixad {} +
fi
chmod 750 /var/lib/pixa
exec su-exec pixad /usr/local/bin/pixad "$@"
}
go.mod
+2 -1
View File
@@ -14,11 +14,13 @@ require (
github.com/go-chi/httprate v0.16.0
github.com/gorilla/csrf v1.7.3
github.com/gorilla/securecookie v1.1.2
github.com/hashicorp/golang-lru/v2 v2.0.7
github.com/prometheus/client_golang v1.23.2
github.com/slok/go-http-metrics v0.13.0
github.com/spf13/cobra v1.10.2
go.uber.org/fx v1.24.0
golang.org/x/crypto v0.41.0
golang.org/x/sync v0.19.0
modernc.org/sqlite v1.42.2
)
@@ -133,7 +135,6 @@ require (
golang.org/x/image v0.34.0 // indirect
golang.org/x/net v0.43.0 // indirect
golang.org/x/oauth2 v0.30.0 // indirect
golang.org/x/sync v0.19.0 // indirect
golang.org/x/sys v0.36.0 // indirect
golang.org/x/term v0.34.0 // indirect
golang.org/x/text v0.32.0 // indirect
go.sum
+2
View File
@@ -228,6 +228,8 @@ github.com/hashicorp/go-version v1.2.1/go.mod h1:fltr4n8CU8Ke44wwGCBoEymUuxUHl09
github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
github.com/hashicorp/golang-lru v0.5.4 h1:YDjusn29QI/Das2iO9M0BHnIbxPeyuCHsjMW+lJfyTc=
github.com/hashicorp/golang-lru v0.5.4/go.mod h1:iADmTwqILo4mZ8BN3D2Q6+9jd8WM5uGBxy+E8yxSoD4=
github.com/hashicorp/golang-lru/v2 v2.0.7 h1:a+bsQ5rvGLjzHuww6tVxozPZFVghXaHOwFs4luLUK2k=
github.com/hashicorp/golang-lru/v2 v2.0.7/go.mod h1:QeFd9opnmA6QUJc5vARoKUSoFhyfM2/ZepoAG6RGpeM=
github.com/hashicorp/hcl v1.0.1-vault-7 h1:ag5OxFVy3QYTFTJODRzTKVZ6xvdfLLCA1cy/Y6xGI0I=
github.com/hashicorp/hcl v1.0.1-vault-7/go.mod h1:XYhtn6ijBSAj6n4YqAaf7RBPS4I06AItNorpy+MoQNM=
github.com/hashicorp/logutils v1.0.0/go.mod h1:QIAnNjmIWmVIIkWDTG1z5v++HQmx9WQRO+LraFDTW64=
internal/config/cache_max_bytes_internal_test.go
+13 -154
View File
@@ -1,26 +1,10 @@
package config
import (
"errors"
"log/slog"
"os"
"path/filepath"
"strings"
"testing"
)
// Static errors returned by the stub free-space probes below.
var (
errTestStatfsFailed = errors.New("statfs failed")
errTestProbeNotExpected = errors.New("probe must not be called")
)
// discardLogger returns a logger that swallows all output, for tests
// that exercise code paths which log.
func discardLogger() *slog.Logger {
return slog.New(slog.DiscardHandler)
}
// TestCacheMaxBytesExplicitValueUsedWithoutFloor verifies that an
// explicitly configured cache_max_bytes value is used exactly as
// given: the 500 MiB floor applies only to the computed default, never
@@ -151,155 +135,30 @@ func TestCacheMaxBytesInvalidValuesAbortStartup(t *testing.T) {
}
}
// TestComputeDefaultCacheMaxBytesUses75PercentOfFreeSpace verifies the
// computed default is 75% of the probed free space when that exceeds
// the floor.
func TestComputeDefaultCacheMaxBytesUses75PercentOfFreeSpace(t *testing.T) {
// TestCacheMaxBytesExplicitIsRecorded verifies that an omitted
// cache_max_bytes is recorded as not explicit, so the cache works out
// the default when it opens, and that an explicit zero is recorded as
// explicit, so it disables the disk cache instead.
func TestCacheMaxBytesExplicitIsRecorded(t *testing.T) {
t.Parallel()
// 4 GiB free -> 3 GiB default.
probe := func(string) (uint64, error) { return 4294967296, nil }
signingKeyLine := "signing_key: " + validTestSigningKey + "\n"
got, err := ComputeDefaultCacheMaxBytes(t.TempDir(), probe)
if err != nil {
t.Fatalf("ComputeDefaultCacheMaxBytes returned error: %v", err)
}
if got != 3221225472 {
t.Errorf("ComputeDefaultCacheMaxBytes = %d, want 3221225472 (75%% of 4 GiB)",
got)
}
}
// TestComputeDefaultCacheMaxBytesAppliesFloorToComputedDefault
// verifies that when 75% of free space is below 500 MiB, the computed
// default is floored at DefaultCacheMaxBytesFloor.
func TestComputeDefaultCacheMaxBytesAppliesFloorToComputedDefault(t *testing.T) {
t.Parallel()
cases := []struct {
name string
freeBytes uint64
}{
{name: "100 MiB free", freeBytes: 104857600},
{name: "zero free", freeBytes: 0},
{name: "just below floor threshold", freeBytes: 699050665},
}
for _, tc := range cases {
t.Run(tc.name, func(t *testing.T) {
t.Parallel()
probe := func(string) (uint64, error) { return tc.freeBytes, nil }
got, err := ComputeDefaultCacheMaxBytes(t.TempDir(), probe)
if err != nil {
t.Fatalf("ComputeDefaultCacheMaxBytes returned error: %v", err)
}
if got != DefaultCacheMaxBytesFloor {
t.Errorf("ComputeDefaultCacheMaxBytes = %d, want floor %d",
got, DefaultCacheMaxBytesFloor)
}
})
}
}
// TestComputeDefaultCacheMaxBytesPropagatesProbeError verifies that a
// failing free-space probe produces an error naming the config key,
// instead of a silently wrong default.
func TestComputeDefaultCacheMaxBytesPropagatesProbeError(t *testing.T) {
t.Parallel()
probe := func(string) (uint64, error) { return 0, errTestStatfsFailed }
_, err := ComputeDefaultCacheMaxBytes(t.TempDir(), probe)
if err == nil {
t.Fatal("probe failure must produce an error, got nil")
}
t.Logf("got expected error: %v", err)
if !strings.Contains(err.Error(), keyCacheMaxBytes) {
t.Errorf("error %q does not name the config key cache_max_bytes", err.Error())
}
}
// TestResolveCacheMaxBytesComputesDefaultWhenOmitted verifies that an
// omitted cache_max_bytes key resolves to the computed default, that
// the probe is pointed at <state_dir>/cache/ (which must be created
// first so statfs measures the right filesystem), and that the result
// lands on the Config.
func TestResolveCacheMaxBytesComputesDefaultWhenOmitted(t *testing.T) {
t.Parallel()
c, err := configFromYAML(t, "signing_key: "+validTestSigningKey+"\n")
omitted, err := configFromYAML(t, signingKeyLine)
if err != nil {
t.Fatalf("minimal config should be valid, got error: %v", err)
}
c.StateDir = t.TempDir()
wantCacheDir := filepath.Join(c.StateDir, "cache")
var probedPath string
// 4 GiB free -> 3 GiB default.
probe := func(path string) (uint64, error) {
probedPath = path
return 4294967296, nil
if omitted.CacheMaxBytesExplicit {
t.Error("omitted cache_max_bytes recorded as explicit")
}
err = c.resolveCacheMaxBytes(discardLogger(), probe)
zero, err := configFromYAML(t, signingKeyLine+"cache_max_bytes: 0\n")
if err != nil {
t.Fatalf("resolveCacheMaxBytes returned error: %v", err)
t.Fatalf("cache_max_bytes: 0 must be accepted, got error: %v", err)
}
if c.CacheMaxBytes != 3221225472 {
t.Errorf("CacheMaxBytes = %d, want computed default 3221225472",
c.CacheMaxBytes)
}
if probedPath != wantCacheDir {
t.Errorf("free space probed at %q, want cache directory %q",
probedPath, wantCacheDir)
}
info, err := os.Stat(wantCacheDir)
if err != nil || !info.IsDir() {
t.Errorf("cache directory %q was not created before probing: info=%v err=%v",
wantCacheDir, info, err)
}
}
// TestResolveCacheMaxBytesDoesNotOverrideExplicitValue verifies that
// an explicitly configured value survives resolution untouched and
// that the free-space probe is never consulted for it.
func TestResolveCacheMaxBytesDoesNotOverrideExplicitValue(t *testing.T) {
t.Parallel()
yamlContent := "signing_key: " + validTestSigningKey + "\ncache_max_bytes: 1024\n"
c, err := configFromYAML(t, yamlContent)
if err != nil {
t.Fatalf("explicit cache_max_bytes must be accepted, got error: %v", err)
}
c.StateDir = t.TempDir()
probe := func(string) (uint64, error) {
t.Error("free-space probe must not be consulted for explicit values")
return 0, errTestProbeNotExpected
}
err = c.resolveCacheMaxBytes(discardLogger(), probe)
if err != nil {
t.Fatalf("resolveCacheMaxBytes returned error: %v", err)
}
if c.CacheMaxBytes != 1024 {
t.Errorf("CacheMaxBytes = %d, want explicit 1024 (no floor, no recompute)",
c.CacheMaxBytes)
if !zero.CacheMaxBytesExplicit {
t.Error("cache_max_bytes: 0 not recorded as explicit")
}
}
internal/config/cachesize.go
-116
View File
@@ -1,116 +0,0 @@
package config
import (
"fmt"
"log/slog"
"math"
"os"
"path/filepath"
"syscall"
)
// DefaultCacheMaxBytesFloor is the minimum computed default for the
// cache_max_bytes setting: 500 MiB. The floor applies only to the
// computed default (when the key is omitted from the configuration),
// never to explicitly configured values.
const DefaultCacheMaxBytesFloor int64 = 524288000
// cacheDirPerms is the permission mode for the cache directory created
// before probing free space, matching the state directory permissions.
const cacheDirPerms = 0o750
// freeSpaceFractionNumerator and freeSpaceFractionDenominator express
// the 75% share of free space used for the computed default limit as
// integer arithmetic (dividing before multiplying avoids overflow).
const (
freeSpaceFractionNumerator uint64 = 3
freeSpaceFractionDenominator uint64 = 4
)
// FreeSpaceProbeFunc reports the number of free bytes available on the
// filesystem containing path. It is a function type so tests can
// inject a fake probe instead of depending on the host disk.
type FreeSpaceProbeFunc func(path string) (uint64, error)
// defaultFreeSpaceProbe reports free filesystem bytes via statfs on
// the given path, as available to unprivileged processes.
func defaultFreeSpaceProbe(path string) (uint64, error) {
var stat syscall.Statfs_t
err := syscall.Statfs(path, &stat)
if err != nil {
return 0, err
}
if stat.Bsize < 0 {
return 0, fmt.Errorf("%w %d for %q", errNegativeBlockSize, stat.Bsize, path)
}
blockSize := uint64(stat.Bsize)
return stat.Bavail * blockSize, nil
}
// ComputeDefaultCacheMaxBytes returns the default cache size limit for
// the filesystem containing cacheDir: 75% of the free bytes reported
// by probe, with a floor of DefaultCacheMaxBytesFloor.
func ComputeDefaultCacheMaxBytes(
cacheDir string, probe FreeSpaceProbeFunc,
) (int64, error) {
freeBytes, err := probe(cacheDir)
if err != nil {
return 0, fmt.Errorf("config key %q: cannot determine free space for %q: %w",
"cache_max_bytes", cacheDir, err)
}
computed := freeBytes / freeSpaceFractionDenominator * freeSpaceFractionNumerator
computed = min(computed, math.MaxInt64)
// gosec cannot see that min() above bounds computed, so it reads
// this conversion as potentially overflowing. It cannot: computed is
// at most math.MaxInt64 on every path here.
//nolint:gosec // G115: clamped to MaxInt64 by min above
limit := int64(computed)
limit = max(limit, DefaultCacheMaxBytesFloor)
return limit, nil
}
// resolveCacheMaxBytes finalizes CacheMaxBytes after state_dir
// validation: an explicitly configured value is kept as-is (no floor
// applies), while an omitted key receives the computed default based
// on free space in <state_dir>/cache/. The cache directory is created
// first so statfs measures the filesystem that will actually hold the
// cache. The effective limit is logged either way.
func (c *Config) resolveCacheMaxBytes(
log *slog.Logger, probe FreeSpaceProbeFunc,
) error {
if !c.cacheMaxBytesExplicit {
cacheDir := filepath.Join(c.StateDir, "cache")
err := os.MkdirAll(cacheDir, cacheDirPerms)
if err != nil {
return fmt.Errorf("config key %q: cannot create cache directory %q: %w",
keyCacheMaxBytes, cacheDir, err)
}
limit, err := ComputeDefaultCacheMaxBytes(cacheDir, probe)
if err != nil {
return err
}
c.CacheMaxBytes = limit
log.Info("computed default cache size limit from free space",
"cache_max_bytes", limit,
"cache_dir", cacheDir,
)
}
log.Info("effective cache size limit",
"cache_max_bytes", c.CacheMaxBytes,
"cache_disabled", c.CacheMaxBytes == 0,
)
return nil
}
internal/config/concurrency_limits_internal_test.go
+162
View File
@@ -0,0 +1,162 @@
package config
import (
"runtime"
"testing"
)
// The variables that set the two concurrency limits.
const (
testMaxConcurrentProcessingVar = "PIXA_MAX_CONCURRENT_PROCESSING"
testUpstreamConnectionsVar = "PIXA_UPSTREAM_CONNECTIONS"
)
// TestOmittedConcurrencyLimitsUseDefaults checks that an omitted
// max_concurrent_processing is the number of CPUs Go uses and an omitted
// upstream_connections is 64.
func TestOmittedConcurrencyLimitsUseDefaults(t *testing.T) {
t.Parallel()
c, err := configFromYAML(t, signingKeyLine)
if err != nil {
t.Fatalf("minimal config should be valid, got error: %v", err)
}
if c.MaxConcurrentProcessing != runtime.GOMAXPROCS(0) {
t.Errorf("MaxConcurrentProcessing = %d, want %d, one per CPU",
c.MaxConcurrentProcessing, runtime.GOMAXPROCS(0))
}
if c.UpstreamConnections != 64 {
t.Errorf("UpstreamConnections = %d, want 64", c.UpstreamConnections)
}
}
// TestExplicitConcurrencyLimitsAreUsed checks that valid values for the
// two limits are used as given.
func TestExplicitConcurrencyLimitsAreUsed(t *testing.T) {
t.Parallel()
c, err := configFromYAML(t, signingKeyLine+
"max_concurrent_processing: 3\nupstream_connections: 10\n")
if err != nil {
t.Fatalf("valid config should load, got error: %v", err)
}
if c.MaxConcurrentProcessing != 3 {
t.Errorf("MaxConcurrentProcessing = %d, want 3", c.MaxConcurrentProcessing)
}
if c.UpstreamConnections != 10 {
t.Errorf("UpstreamConnections = %d, want 10", c.UpstreamConnections)
}
}
// TestInvalidConcurrencyLimitAbortsStartup checks that a limit that is
// not a whole number of at least 1, or is null, aborts startup naming the
// key and the value, and the variable too where the value could have come
// from it.
func TestInvalidConcurrencyLimitAbortsStartup(t *testing.T) {
t.Parallel()
processing := keyMaxConcurrentProcessing
connections := keyUpstreamConnections
runAbortCases(t, []abortCase{
{
name: "max_concurrent_processing zero",
yaml: signingKeyLine + processing + ": 0\n",
wantErrSubstrings: []string{
processing, testMaxConcurrentProcessingVar, "value 0",
},
},
{
name: "max_concurrent_processing negative",
yaml: signingKeyLine + processing + ": -2\n",
wantErrSubstrings: []string{
processing, testMaxConcurrentProcessingVar, "value -2",
},
},
{
name: "max_concurrent_processing not a number",
yaml: signingKeyLine + processing + ": lots\n",
wantErrSubstrings: []string{
processing, testMaxConcurrentProcessingVar, "lots",
},
},
{
name: "max_concurrent_processing fractional",
yaml: signingKeyLine + processing + ": 1.5\n",
wantErrSubstrings: []string{processing, "1.5"},
},
{
name: "max_concurrent_processing null",
yaml: signingKeyLine + processing + ": null\n",
wantErrSubstrings: []string{processing, nullValueText},
},
{
name: "upstream_connections zero",
yaml: signingKeyLine + connections + ": 0\n",
wantErrSubstrings: []string{
connections, testUpstreamConnectionsVar, "value 0",
},
},
{
name: "upstream_connections negative",
yaml: signingKeyLine + connections + ": -5\n",
wantErrSubstrings: []string{
connections, testUpstreamConnectionsVar, "value -5",
},
},
{
name: "upstream_connections not a number",
yaml: signingKeyLine + connections + ": many\n",
wantErrSubstrings: []string{
connections, testUpstreamConnectionsVar, "many",
},
},
{
name: "upstream_connections null",
yaml: signingKeyLine + connections + ": null\n",
wantErrSubstrings: []string{connections, nullValueText},
},
})
}
// TestConcurrencyLimitsFromEnvironment checks that the two variables set
// the limits over the config file, and that an invalid value in either
// aborts startup naming the variable and the value.
func TestConcurrencyLimitsFromEnvironment(t *testing.T) {
t.Setenv(testMaxConcurrentProcessingVar, "3")
t.Setenv(testUpstreamConnectionsVar, "10")
c, err := configFromYAML(t, signingKeyLine+
"max_concurrent_processing: 5\nupstream_connections: 50\n")
if err != nil {
t.Fatalf("limits from the environment should load: %v", err)
}
if c.MaxConcurrentProcessing != 3 || c.UpstreamConnections != 10 {
t.Errorf("limits = %d and %d, want 3 and 10 from the environment",
c.MaxConcurrentProcessing, c.UpstreamConnections)
}
cases := []struct {
variable string
value string
}{
{testMaxConcurrentProcessingVar, "lots"},
{testMaxConcurrentProcessingVar, "0"},
{testUpstreamConnectionsVar, "-1"},
{testUpstreamConnectionsVar, "ten"},
}
for _, tc := range cases {
t.Run(tc.variable+"="+tc.value, func(t *testing.T) {
t.Setenv(tc.variable, tc.value)
_, err := configFromYAML(t, signingKeyLine)
wantStartupError(t, err, tc.variable, tc.value)
})
}
}
internal/config/config.go
+282 -49
View File
@@ -4,15 +4,19 @@ package config
import (
"errors"
"fmt"
"io/fs"
"log/slog"
"math"
"net/netip"
"net/url"
"os"
"path/filepath"
"runtime"
"sort"
"strconv"
"strings"
"syscall"
"time"
"git.eeqj.de/sneak/smartconfig"
"go.uber.org/fx"
@@ -24,6 +28,11 @@ const (
DefaultPort = 8080
DefaultStateDir = "/var/lib/pixa"
DefaultUpstreamConnectionsPerHost = 20
DefaultUpstreamConnections = 64
DefaultAccessControlAllowOrigin = "*"
DefaultUpstreamFetchTimeout = 30 * time.Second
DefaultUpstreamMaxResponseSize = 50 << 20 // 50 MiB
DefaultDownstreamTimeout = 60 * time.Second
)
// Configuration key names.
@@ -41,13 +50,19 @@ const (
keyAllowlistHosts = "allowlist_hosts"
keyAllowHTTP = "allow_http"
keyUpstreamConnectionsPerHost = "upstream_connections_per_host"
keyUpstreamConnections = "upstream_connections"
keyMaxConcurrentProcessing = "max_concurrent_processing"
keyCacheMaxBytes = "cache_max_bytes"
keyBlockedNetworks = "blocked_networks"
keyTrustedProxies = "trusted_proxies"
keyAccessControlAllowOrigin = "access_control_allow_origin"
keyUpstreamFetchTimeout = "upstream_fetch_timeout"
keyUpstreamMaxResponseSize = "upstream_max_response_size"
keyDownstreamTimeout = "downstream_timeout"
)
// placeholderSigningKey is the dummy signing_key shipped in
// config.example.yml. It is 45 characters, so it passes the length
// configs/config.example.yml. It is 45 characters, so it passes the length
// check, but it is public in this repository and must be rejected at
// startup so no deployment ever signs URLs with it.
const placeholderSigningKey = "CHANGE_ME_generate_with_openssl_rand_base64_32"
@@ -69,23 +84,26 @@ var (
errEmptyEntry = errors.New("contains an empty entry")
errNotAValidURL = errors.New("not a valid URL")
errPortOutOfRange = errors.New("outside the valid port range")
errTooFewConnections = errors.New("must be at least 1")
errSizeOutOfRange = errors.New("outside the accepted range")
errMustBeAtLeastOne = errors.New("must be at least 1")
errValueTooShort = errors.New("value too short")
errPlaceholderKey = errors.New(
"is the placeholder from config.example.yml; " +
"is the placeholder from configs/config.example.yml; " +
"generate a real key with: openssl rand -base64 32")
errMustBeSetTogether = errors.New("must be set together")
errMustNotBeNegative = errors.New("must not be negative")
errOverflowsInt64 = errors.New("overflows a 64-bit integer")
errNegativeBlockSize = errors.New(
"statfs reported negative block size")
errValueNull = errors.New(
errValueNull = errors.New(
"value is null; omit the key entirely to use the default")
errValuesNull = errors.New(
"value is null; omit a key entirely to use its default")
errNotBareHostname = errors.New(
"must be a bare hostname without scheme, path, or whitespace")
errNoHostnameLabels = errors.New("contains no hostname labels")
errNotADuration = errors.New("not a duration such as 30s or 2m")
errMustBePositive = errors.New("must be positive")
errNotAnOrigin = errors.New(
`not "*" or an origin such as https://example.com`)
)
// Params defines dependencies for Config.
@@ -112,6 +130,29 @@ type Config struct {
AllowHTTP bool // Allow non-TLS upstream (testing only)
UpstreamConnectionsPerHost int // Max concurrent connections per upstream host
// UpstreamConnections is the most concurrent connections to all
// upstream hosts together, on top of the per-host limit.
// MaxConcurrentProcessing is the most images processed at once.
UpstreamConnections int
MaxConcurrentProcessing int
// UpstreamFetchTimeout is the time allowed for one fetch from an
// upstream host. UpstreamMaxResponseSize is the largest upstream
// response accepted, in bytes, and also the image processor's input
// limit.
UpstreamFetchTimeout time.Duration
UpstreamMaxResponseSize int64
// AccessControlAllowOrigin is the origin the CORS middleware allows
// to read responses: "*" for any, or one origin such as
// https://example.com.
AccessControlAllowOrigin string
// DownstreamTimeout bounds how long answering one client request may
// take. It is both the HTTP server's write timeout and the deadline
// of the per-request timeout middleware.
DownstreamTimeout time.Duration
// BlockedNetworks are operator-supplied CIDR ranges to refuse in
// addition to the built-in SSRF blocklist. Enforced by the upstream
// fetcher's dialer; the built-in ranges always apply.
@@ -128,18 +169,19 @@ type Config struct {
// address, and an explicit list replaces the default.
TrustedProxies []netip.Prefix
// CacheMaxBytes is the disk cache size limit in bytes. Zero
// disables the disk cache entirely. When cache_max_bytes is
// omitted from the configuration, this holds the computed default
// (75% of free space on the filesystem containing
// <state_dir>/cache/, floored at DefaultCacheMaxBytesFloor).
// CacheMaxBytes is the disk cache size limit in bytes. Only an
// explicit zero (CacheMaxBytesExplicit true) disables the disk
// cache. Zero with CacheMaxBytesExplicit false means
// cache_max_bytes was omitted, and the cache works out the default
// limit when it opens.
CacheMaxBytes int64
// cacheMaxBytesExplicit records whether cache_max_bytes was
// CacheMaxBytesExplicit records whether cache_max_bytes was
// explicitly set, in the environment or the configuration file.
// Explicit values are used exactly as given; only an omitted key
// gets the computed default (and its floor) in resolveCacheMaxBytes.
cacheMaxBytesExplicit bool
// Explicit values are used exactly as given; for an omitted key the
// cache works out the default limit when it opens (see
// imgcache.CacheConfig.UseDefaultMaxBytes).
CacheMaxBytesExplicit bool
}
// New creates a new Config instance from the environment and the
@@ -176,9 +218,13 @@ func New(_ fx.Lifecycle, params Params) (*Config, error) {
return nil, err
}
err = c.resolveCacheMaxBytes(log, defaultFreeSpaceProbe)
if err != nil {
return nil, err
// An omitted cache_max_bytes is worked out and logged when the
// cache opens.
if c.CacheMaxBytesExplicit {
log.Info("effective cache size limit",
"cache_max_bytes", c.CacheMaxBytes,
"cache_disabled", c.CacheMaxBytes == 0,
)
}
if c.Debug {
@@ -195,14 +241,12 @@ func New(_ fx.Lifecycle, params Params) (*Config, error) {
// unparseable or invalid is an error: defaults apply only to omitted
// keys, never to invalid explicit values.
func newFromSmartConfig(sc *smartconfig.Config) (*Config, error) {
if sc != nil {
err := validateKnownKeys(sc)
if err != nil {
return nil, err
}
err := validateKnownKeys(sc)
if err != nil {
return nil, err
}
err := validateAllowlistHostsValue(sc)
err = validateAllowlistHostsValue(sc)
if err != nil {
return nil, err
}
@@ -240,16 +284,30 @@ func newFromSmartConfig(sc *smartconfig.Config) (*Config, error) {
AllowHTTP: loader.boolVal(keyAllowHTTP, false),
UpstreamConnectionsPerHost: loader.intVal(
keyUpstreamConnectionsPerHost, DefaultUpstreamConnectionsPerHost),
UpstreamConnections: loader.intVal(
keyUpstreamConnections, DefaultUpstreamConnections),
// Decoding and encoding are CPU-bound, so the default is one image
// per CPU Go uses, which follows a container's CPU limit.
MaxConcurrentProcessing: loader.intVal(
keyMaxConcurrentProcessing, runtime.GOMAXPROCS(0)),
UpstreamFetchTimeout: loader.durationVal(
keyUpstreamFetchTimeout, DefaultUpstreamFetchTimeout),
UpstreamMaxResponseSize: loader.int64Val(
keyUpstreamMaxResponseSize, DefaultUpstreamMaxResponseSize),
AccessControlAllowOrigin: loader.stringVal(
keyAccessControlAllowOrigin, DefaultAccessControlAllowOrigin),
DownstreamTimeout: loader.durationVal(
keyDownstreamTimeout, DefaultDownstreamTimeout),
CacheMaxBytes: loader.int64Val(keyCacheMaxBytes, 0),
BlockedNetworks: blockedNetworks,
TrustedProxies: trustedProxies,
}
// The computed default for cache_max_bytes needs a validated
// state_dir, so it is resolved later (resolveCacheMaxBytes); here
// we only record whether the operator set the key explicitly.
// The default for an omitted cache_max_bytes is worked out when
// the cache opens; here we only record whether the operator set
// the key explicitly.
if _, present := lookupValue(sc, keyCacheMaxBytes); present {
c.cacheMaxBytesExplicit = true
c.CacheMaxBytesExplicit = true
}
// Build DBURL from StateDir if not explicitly set. The derived URL
@@ -262,7 +320,8 @@ func newFromSmartConfig(sc *smartconfig.Config) (*Config, error) {
settingName(keyDBURL), errValueEmpty)
}
c.DBURL = fmt.Sprintf("file:%s/state.sqlite3?_journal_mode=WAL", c.StateDir)
// The driver sets the journal mode only through a _pragma parameter.
c.DBURL = fmt.Sprintf("file:%s/state.sqlite3?_pragma=journal_mode(WAL)", c.StateDir)
}
if loader.err != nil {
@@ -282,8 +341,13 @@ func newFromSmartConfig(sc *smartconfig.Config) (*Config, error) {
// being silently ignored, and rejects keys that are explicitly set to
// null: a null is a SET value, never an omission, so it must not
// silently take the default. The env section is permitted because
// smartconfig consumes it for environment variable injection.
// smartconfig consumes it for environment variable injection. A nil sc
// means no config file, which has no keys to check.
func validateKnownKeys(sc *smartconfig.Config) error {
if sc == nil {
return nil
}
var unknown, nullKeys []string
for key, value := range sc.Data() {
@@ -353,8 +417,10 @@ func isKnownConfigKey(key string) bool {
switch key {
case keyDebug, keyMaintenanceMode, keyPort, keyStateDir, keySentryDSN,
keyDBURL, keyMetrics, keySigningKey, keyAllowlistHosts, keyAllowHTTP,
keyUpstreamConnectionsPerHost, keyCacheMaxBytes, keyBlockedNetworks,
keyTrustedProxies, "env":
keyUpstreamConnectionsPerHost, keyUpstreamConnections,
keyMaxConcurrentProcessing, keyCacheMaxBytes, keyBlockedNetworks,
keyTrustedProxies, keyAccessControlAllowOrigin, keyUpstreamFetchTimeout,
keyUpstreamMaxResponseSize, keyDownstreamTimeout, "env":
return true
}
@@ -379,9 +445,15 @@ func envVarNames() map[string]string {
keyAllowlistHosts: "PIXA_ALLOWLIST_HOSTS",
keyAllowHTTP: "PIXA_ALLOW_HTTP",
keyUpstreamConnectionsPerHost: "PIXA_UPSTREAM_CONNECTIONS_PER_HOST",
keyUpstreamConnections: "PIXA_UPSTREAM_CONNECTIONS",
keyMaxConcurrentProcessing: "PIXA_MAX_CONCURRENT_PROCESSING",
keyCacheMaxBytes: "PIXA_CACHE_MAX_BYTES",
keyBlockedNetworks: "PIXA_BLOCKED_NETWORKS",
keyTrustedProxies: "PIXA_TRUSTED_PROXIES",
keyAccessControlAllowOrigin: "PIXA_ACCESS_CONTROL_ALLOW_ORIGIN",
keyUpstreamFetchTimeout: "PIXA_UPSTREAM_FETCH_TIMEOUT",
keyUpstreamMaxResponseSize: "PIXA_UPSTREAM_MAX_RESPONSE_SIZE",
keyDownstreamTimeout: "PIXA_DOWNSTREAM_TIMEOUT",
}
}
@@ -482,8 +554,8 @@ func (c *Config) ensureStateDirWritable() error {
}
// validateSigningKey checks that the signing key is present, long
// enough, and not the public placeholder from config.example.yml. The
// key value itself is never echoed in error messages.
// enough, and not the public placeholder from configs/config.example.yml.
// The key value itself is never echoed in error messages.
func (c *Config) validateSigningKey() error {
if c.SigningKey == "" {
return fmt.Errorf("%s: %w", settingName(keySigningKey), errValueRequired)
@@ -518,10 +590,9 @@ func (c *Config) validate() error {
settingName(keyPort), c.Port, errPortOutOfRange, maxPort)
}
if c.UpstreamConnectionsPerHost < 1 {
return fmt.Errorf("%s: value %d %w",
settingName(keyUpstreamConnectionsPerHost),
c.UpstreamConnectionsPerHost, errTooFewConnections)
err = c.validateConcurrencyLimits()
if err != nil {
return err
}
if c.StateDir == "" {
@@ -535,6 +606,11 @@ func (c *Config) validate() error {
settingName(keyCacheMaxBytes), c.CacheMaxBytes, errMustNotBeNegative)
}
err = c.validateUpstreamMaxResponseSize()
if err != nil {
return err
}
for _, host := range c.AllowlistHosts {
err := validateAllowlistHost(host)
if err != nil {
@@ -556,6 +632,106 @@ func (c *Config) validate() error {
errMustBeSetTogether)
}
return c.validateAccessControlAllowOrigin()
}
// validateUpstreamMaxResponseSize checks that upstream_max_response_size
// is from 1 byte to 1 GiB. An upstream response is read whole into
// memory, and the image processor reads one byte past this limit, which
// must not overflow.
func (c *Config) validateUpstreamMaxResponseSize() error {
const maxUpstreamMaxResponseSize = 1 << 30 // 1 GiB
if c.UpstreamMaxResponseSize < 1 ||
c.UpstreamMaxResponseSize > maxUpstreamMaxResponseSize {
return fmt.Errorf("%s: value %d is %w 1-%d",
settingName(keyUpstreamMaxResponseSize), c.UpstreamMaxResponseSize,
errSizeOutOfRange, maxUpstreamMaxResponseSize)
}
return nil
}
// validateAccessControlAllowOrigin accepts "*" or an origin exactly as a browser
// sends it: http or https, an IP address as netip writes it or a lowercase name
// with a letter in its last part, and an optional port 1-65535, not the default.
func (c *Config) validateAccessControlAllowOrigin() error {
origin := c.AccessControlAllowOrigin
if origin == "*" {
return nil
}
errOrigin := fmt.Errorf("%s: value %q is %w",
settingName(keyAccessControlAllowOrigin), origin, errNotAnOrigin)
parsed, err := url.Parse(origin)
if err != nil {
return errOrigin
}
defaultPort := map[string]string{"http": "80", "https": "443"}[parsed.Scheme]
if defaultPort == "" {
return errOrigin
}
const letters = "abcdefghijklmnopqrstuvwxyz"
host := parsed.Hostname()
lastPart := host[strings.LastIndex(host, ".")+1:]
addr, err := netip.ParseAddr(host)
switch {
case err == nil && addr.Is6():
host = "[" + addr.String() + "]"
case err == nil:
host = addr.String()
case strings.Trim(host, letters+"0123456789-.") != "": // a character other than these
return errOrigin
case !strings.ContainsAny(lastPart, letters):
return errOrigin
}
// The value must be exactly the origin rebuilt from its parts.
rebuilt := parsed.Scheme + "://" + host
port := parsed.Port()
if port != "" {
_, err := strconv.ParseUint(port, 10, 16)
if err != nil || port[0] == '0' || port == defaultPort {
return errOrigin
}
rebuilt += ":" + port
}
if rebuilt != origin {
return errOrigin
}
return nil
}
// validateConcurrencyLimits checks that the two upstream connection limits
// and the image processing limit are at least 1.
func (c *Config) validateConcurrencyLimits() error {
if c.UpstreamConnectionsPerHost < 1 {
return fmt.Errorf("%s: value %d %w",
settingName(keyUpstreamConnectionsPerHost),
c.UpstreamConnectionsPerHost, errMustBeAtLeastOne)
}
if c.UpstreamConnections < 1 {
return fmt.Errorf("%s: value %d %w",
settingName(keyUpstreamConnections),
c.UpstreamConnections, errMustBeAtLeastOne)
}
if c.MaxConcurrentProcessing < 1 {
return fmt.Errorf("%s: value %d %w",
settingName(keyMaxConcurrentProcessing),
c.MaxConcurrentProcessing, errMustBeAtLeastOne)
}
return nil
}
@@ -608,19 +784,27 @@ func loadConfigFile(log *slog.Logger, appName string) (*smartconfig.Config, erro
for _, path := range configPaths {
cleanPath := filepath.Clean(path)
// Only a config file that does not exist is skipped, including
// one whose path runs through a file, such as under a HOME of
// /dev/null. One that cannot be read or does not parse is a
// fatal startup error.
_, statErr := os.Stat(cleanPath)
if statErr == nil {
// A config file that exists but does not parse is a fatal
// startup error, never something to skip over.
sc, err := smartconfig.NewFromConfigPath(path)
if err != nil {
return nil, fmt.Errorf("failed to parse config file %s: %w", path, err)
}
log.Info("loaded config file", "path", path)
return sc, nil
if errors.Is(statErr, fs.ErrNotExist) || errors.Is(statErr, syscall.ENOTDIR) {
continue
}
if statErr != nil {
return nil, fmt.Errorf("failed to read config file %s: %w", path, statErr)
}
sc, err := smartconfig.NewFromConfigPath(path)
if err != nil {
return nil, fmt.Errorf("failed to parse config file %s: %w", path, err)
}
log.Info("loaded config file", "path", path)
return sc, nil
}
return nil, nil //nolint:nilnil // nil config is valid (use defaults)
@@ -673,6 +857,19 @@ func (l *strictLoader) int64Val(key string, defaultVal int64) int64 {
return val
}
func (l *strictLoader) durationVal(key string, defaultVal time.Duration) time.Duration {
if l.err != nil {
return 0
}
val, err := getDuration(l.sc, key, defaultVal)
if err != nil {
l.err = err
}
return val
}
func (l *strictLoader) boolVal(key string, defaultVal bool) bool {
if l.err != nil {
return false
@@ -794,6 +991,42 @@ func getInt64(sc *smartconfig.Config, key string, defaultVal int64) (int64, erro
}
}
// getDuration returns the duration value for key, or defaultVal if the
// key is omitted. A present value must be a positive Go duration string
// such as "30s" or "2m", read with time.ParseDuration; a bare number has
// no unit and is an error, as is an explicit null.
func getDuration(
sc *smartconfig.Config, key string, defaultVal time.Duration,
) (time.Duration, error) {
raw, ok := lookupValue(sc, key)
if !ok {
return defaultVal, nil
}
if raw == nil {
return 0, errNullConfigValue(key)
}
str, ok := raw.(string)
if !ok {
return 0, fmt.Errorf("config key %q: value %v (%T) is %w",
key, raw, raw, errNotADuration)
}
parsed, err := time.ParseDuration(strings.TrimSpace(str))
if err != nil {
return 0, fmt.Errorf("%s: value %q is %w",
settingName(key), str, errNotADuration)
}
if parsed <= 0 {
return 0, fmt.Errorf("%s: value %q %w",
settingName(key), str, errMustBePositive)
}
return parsed, nil
}
// getBool returns the boolean value for key, or defaultVal if the key
// is omitted. A present value that is not a boolean (or a ParseBool-able
// string), or is explicitly null, is an error; numbers are not accepted
internal/config/config_validation_internal_test.go
+387 -1
View File
@@ -1,13 +1,17 @@
package config
import (
"database/sql"
"log/slog"
"os"
"path/filepath"
"strings"
"testing"
"time"
"git.eeqj.de/sneak/smartconfig"
_ "modernc.org/sqlite" // SQLite driver registration
)
// validTestSigningKey is a 32-character signing key that satisfies the
@@ -93,12 +97,43 @@ func TestOmittedValuesUseDefaults(t *testing.T) {
t.Errorf("AllowlistHosts = %v, want empty", c.AllowlistHosts)
}
wantDBURL := "file:" + DefaultStateDir + "/state.sqlite3?_journal_mode=WAL"
wantDBURL := "file:" + DefaultStateDir +
"/state.sqlite3?_pragma=journal_mode(WAL)"
if c.DBURL != wantDBURL {
t.Errorf("DBURL = %q, want derived default %q", c.DBURL, wantDBURL)
}
}
// TestDefaultDBURLOpensTheDatabaseInWALMode opens the db_url derived from
// state_dir with the SQLite driver pixad uses and checks that the database
// is in WAL mode: the driver ignores any parameter it does not know.
func TestDefaultDBURLOpensTheDatabaseInWALMode(t *testing.T) {
t.Parallel()
c, err := configFromYAML(t, signingKeyLine+"state_dir: "+t.TempDir()+"\n")
if err != nil {
t.Fatalf("config with only state_dir set should be valid, got: %v", err)
}
db, err := sql.Open("sqlite", c.DBURL)
if err != nil {
t.Fatalf("failed to open %q: %v", c.DBURL, err)
}
t.Cleanup(func() { _ = db.Close() })
var journalMode string
err = db.QueryRowContext(t.Context(), "PRAGMA journal_mode").Scan(&journalMode)
if err != nil {
t.Fatalf("failed to read the journal mode of %q: %v", c.DBURL, err)
}
if journalMode != "wal" {
t.Errorf("journal mode of %q = %q, want wal", c.DBURL, journalMode)
}
}
func TestExplicitValidValuesAreUsed(t *testing.T) {
t.Parallel()
@@ -563,6 +598,116 @@ func TestMalformedConfigFileAbortsStartup(t *testing.T) {
t.Logf("got expected error: %v", err)
}
// TestConfigFileInDirectoryPixaMayNotEnterAbortsStartup checks that a
// config file pixa cannot read because it may not enter its directory
// aborts startup instead of being passed over.
func TestConfigFileInDirectoryPixaMayNotEnterAbortsStartup(t *testing.T) {
if os.Geteuid() == 0 {
t.Skip("root may enter any directory")
}
home := t.TempDir()
configDir := filepath.Join(home, ".config", "pixa-test-nonexistent-app")
configPath := filepath.Join(configDir, "config.yml")
err := os.MkdirAll(configDir, 0o700)
if err != nil {
t.Fatalf("failed to create config directory: %v", err)
}
err = os.WriteFile(configPath, []byte(signingKeyLine), 0o600)
if err != nil {
t.Fatalf("failed to write config: %v", err)
}
err = os.Chmod(configDir, 0)
if err != nil {
t.Fatalf("failed to remove the config directory's permissions: %v", err)
}
// Give the directory back its permissions so t.TempDir can remove it.
t.Cleanup(func() {
//nolint:gosec // G302: a directory needs its execute bit to be removed
_ = os.Chmod(configDir, 0o700)
})
// The ~/.config candidate is the only one that exists: the appname
// rules out /etc, and the working directory is empty.
t.Setenv("PIXA_CONFIG_PATH", "")
t.Setenv("HOME", home)
t.Chdir(t.TempDir())
log := slog.New(slog.DiscardHandler)
sc, err := loadConfigFile(log, "pixa-test-nonexistent-app")
if err == nil {
t.Fatalf("config file pixa cannot read must abort startup, got config: %v",
sc)
}
t.Logf("got expected error: %v", err)
if !strings.Contains(err.Error(), configPath) {
t.Errorf("error %q does not name the config file %s", err.Error(), configPath)
}
}
// TestConfigFileLinkingToItselfAbortsStartup checks that a config file
// pixa cannot read for a reason other than not existing aborts startup,
// as root too: a symbolic link to itself fails with "too many levels of
// symbolic links".
func TestConfigFileLinkingToItselfAbortsStartup(t *testing.T) {
workDir := t.TempDir()
err := os.Symlink("config.yml", filepath.Join(workDir, "config.yml"))
if err != nil {
t.Fatalf("failed to create symbolic link: %v", err)
}
// Only the working directory's config.yml is there: the appname rules
// out /etc, and HOME is empty.
t.Setenv("PIXA_CONFIG_PATH", "")
t.Setenv("HOME", t.TempDir())
t.Chdir(workDir)
log := slog.New(slog.DiscardHandler)
sc, err := loadConfigFile(log, "pixa-test-nonexistent-app")
if err == nil {
t.Fatalf("config file pixa cannot read must abort startup, got config: %v",
sc)
}
t.Logf("got expected error: %v", err)
if !strings.Contains(err.Error(), "config.yml") {
t.Errorf("error %q does not name the config file config.yml", err.Error())
}
}
// TestConfigPathThroughFileIsPassedOver checks that a config file path
// that runs through a file, such as one under a HOME of /dev/null, is
// passed over like one that does not exist, since no file can be there.
func TestConfigPathThroughFileIsPassedOver(t *testing.T) {
// No config file is there: the appname rules out /etc, HOME is
// /dev/null, and the working directory is empty.
t.Setenv("PIXA_CONFIG_PATH", "")
t.Setenv("HOME", os.DevNull)
t.Chdir(t.TempDir())
log := slog.New(slog.DiscardHandler)
sc, err := loadConfigFile(log, "pixa-test-nonexistent-app")
if err != nil {
t.Fatalf("a config path through a file must be passed over, got error: %v",
err)
}
if sc != nil {
t.Errorf("expected no config file, got config: %v", sc)
}
}
func TestEnsureStateDirCreatesDirectory(t *testing.T) {
t.Parallel()
@@ -599,3 +744,244 @@ func TestEnsureStateDirFailsOnUncreatablePath(t *testing.T) {
t.Errorf("error %q does not name the offending key state_dir", err.Error())
}
}
// TestOmittedOriginTimeoutsAndSizeUseDefaults checks that the CORS
// origin, the upstream fetch timeout, the upstream response size limit
// and the downstream timeout default to the values pixa used before they
// could be configured.
func TestOmittedOriginTimeoutsAndSizeUseDefaults(t *testing.T) {
t.Parallel()
c, err := configFromYAML(t, signingKeyLine)
if err != nil {
t.Fatalf("minimal config should be valid, got error: %v", err)
}
if c.AccessControlAllowOrigin != "*" {
t.Errorf("AccessControlAllowOrigin = %q, want *", c.AccessControlAllowOrigin)
}
if c.UpstreamFetchTimeout != 30*time.Second {
t.Errorf("UpstreamFetchTimeout = %v, want 30s", c.UpstreamFetchTimeout)
}
if c.UpstreamMaxResponseSize != 50<<20 {
t.Errorf("UpstreamMaxResponseSize = %d, want %d (50 MiB)",
c.UpstreamMaxResponseSize, 50<<20)
}
if c.DownstreamTimeout != 60*time.Second {
t.Errorf("DownstreamTimeout = %v, want 60s", c.DownstreamTimeout)
}
}
// TestExplicitOriginTimeoutsAndSizeAreUsed checks that valid values for
// the CORS origin, the two timeouts and the response size limit are used
// as given. The size is the largest accepted, 1 GiB.
func TestExplicitOriginTimeoutsAndSizeAreUsed(t *testing.T) {
t.Parallel()
c, err := configFromYAML(t, signingKeyLine+`
access_control_allow_origin: https://app.example.com
upstream_fetch_timeout: 10s
upstream_max_response_size: 1073741824
downstream_timeout: 2m
`)
if err != nil {
t.Fatalf("valid config should load, got error: %v", err)
}
if c.AccessControlAllowOrigin != "https://app.example.com" {
t.Errorf("AccessControlAllowOrigin = %q, want https://app.example.com",
c.AccessControlAllowOrigin)
}
if c.UpstreamFetchTimeout != 10*time.Second {
t.Errorf("UpstreamFetchTimeout = %v, want 10s", c.UpstreamFetchTimeout)
}
if c.UpstreamMaxResponseSize != 1073741824 {
t.Errorf("UpstreamMaxResponseSize = %d, want 1073741824",
c.UpstreamMaxResponseSize)
}
if c.DownstreamTimeout != 2*time.Minute {
t.Errorf("DownstreamTimeout = %v, want 2m", c.DownstreamTimeout)
}
}
// TestOriginWithPortOrAnyOriginIsAccepted checks the other accepted forms
// of access_control_allow_origin: "*", an origin with a port, and origins
// whose host is an IPv4 or IPv6 address.
func TestOriginWithPortOrAnyOriginIsAccepted(t *testing.T) {
t.Parallel()
for _, origin := range []string{
"*", "http://localhost:3000", "http://192.0.2.1", "http://[2001:db8::1]:8080",
} {
c, err := configFromYAML(t, signingKeyLine+
"access_control_allow_origin: \""+origin+"\"\n")
if err != nil {
t.Fatalf("origin %q should be accepted, got error: %v", origin, err)
}
if c.AccessControlAllowOrigin != origin {
t.Errorf("AccessControlAllowOrigin = %q, want %q",
c.AccessControlAllowOrigin, origin)
}
}
}
// invalidTimeoutCases are configs where upstream_fetch_timeout or
// downstream_timeout is not a positive Go duration string; each must
// abort startup naming the key and the value.
func invalidTimeoutCases() []abortCase {
return []abortCase{
{
name: "upstream_fetch_timeout not a duration",
yaml: signingKeyLine + "upstream_fetch_timeout: soon\n",
wantErrSubstrings: []string{keyUpstreamFetchTimeout, "soon"},
},
{
name: "upstream_fetch_timeout number without a unit",
yaml: signingKeyLine + "upstream_fetch_timeout: 45\n",
wantErrSubstrings: []string{keyUpstreamFetchTimeout, "45"},
},
{
name: "upstream_fetch_timeout zero",
yaml: signingKeyLine + "upstream_fetch_timeout: 0s\n",
wantErrSubstrings: []string{keyUpstreamFetchTimeout, "0s"},
},
{
name: "upstream_fetch_timeout negative",
yaml: signingKeyLine + "upstream_fetch_timeout: -5s\n",
wantErrSubstrings: []string{keyUpstreamFetchTimeout, "-5s"},
},
{
name: "upstream_fetch_timeout null",
yaml: signingKeyLine + "upstream_fetch_timeout: null\n",
wantErrSubstrings: []string{keyUpstreamFetchTimeout, nullValueText},
},
{
name: "downstream_timeout not a duration",
yaml: signingKeyLine + "downstream_timeout: 1 minute\n",
wantErrSubstrings: []string{keyDownstreamTimeout, "1 minute"},
},
{
name: "downstream_timeout zero",
yaml: signingKeyLine + "downstream_timeout: 0s\n",
wantErrSubstrings: []string{keyDownstreamTimeout, "0s"},
},
{
name: "downstream_timeout negative",
yaml: signingKeyLine + "downstream_timeout: -1m\n",
wantErrSubstrings: []string{keyDownstreamTimeout, "-1m"},
},
{
name: "downstream_timeout null",
yaml: signingKeyLine + "downstream_timeout:\n",
wantErrSubstrings: []string{keyDownstreamTimeout, nullValueText},
},
}
}
// invalidSizeAndOriginCases are configs where upstream_max_response_size
// is not a whole number of bytes from 1 to 1 GiB, or
// access_control_allow_origin is neither "*" nor an origin; each must
// abort startup naming the key and the value.
func invalidSizeAndOriginCases() []abortCase {
badOrigins := []string{
"", // empty
"example.com", // no scheme
"https://example.com/images", // a path
"https://example.com/", // a trailing slash
// The CORS middleware reads a * inside an origin as a pattern
// that lets other sites read responses.
"https://*",
"https://*.example.com",
"https://*example.com",
"https://a.com,b.com", // two hosts
"https://example.com:", // an empty port
"https://:8443", // no host
"https://example.com:0", // a port below 1
"https://example.com:99999", // a port above 65535
"https://exämple.com", // a host name that is not ASCII
"https://example.com:443", // the default port for https
"http://example.com:80", // the default port for http
"https://example.com:08080", // a port with a leading zero
"https://01.2.3.4", // an IPv4 address with a leading zero
"https://10.0.0", // an IPv4 address with three parts
"https://192.168.1.256", // an IPv4 address part above 255
"https://example.123", // a host name whose last part is a number
"https://[0:0:0:0:0:0:0:1]", // an IPv6 address not in its shortest form
"file://example.com", // a scheme other than http or https
"HTTPS://example.com", // a scheme in upper case
"https://Example.com", // a host name in upper case
}
cases := make([]abortCase, 0, len(badOrigins))
for _, origin := range badOrigins {
cases = append(cases, abortCase{
name: "access_control_allow_origin " + origin,
yaml: signingKeyLine +
"access_control_allow_origin: \"" + origin + "\"\n",
wantErrSubstrings: []string{keyAccessControlAllowOrigin, origin},
})
}
return append(cases, []abortCase{
{
name: "access_control_allow_origin null",
yaml: signingKeyLine + "access_control_allow_origin: null\n",
wantErrSubstrings: []string{keyAccessControlAllowOrigin, nullValueText},
},
{
name: "upstream_max_response_size with a unit",
yaml: signingKeyLine + "upstream_max_response_size: 50MB\n",
wantErrSubstrings: []string{keyUpstreamMaxResponseSize, "50MB"},
},
{
name: "upstream_max_response_size fractional",
yaml: signingKeyLine + "upstream_max_response_size: 1.5\n",
wantErrSubstrings: []string{keyUpstreamMaxResponseSize, "1.5"},
},
{
name: "upstream_max_response_size zero",
yaml: signingKeyLine + "upstream_max_response_size: 0\n",
wantErrSubstrings: []string{keyUpstreamMaxResponseSize, "0"},
},
{
name: "upstream_max_response_size negative",
yaml: signingKeyLine + "upstream_max_response_size: -1\n",
wantErrSubstrings: []string{keyUpstreamMaxResponseSize, "-1"},
},
{
name: "upstream_max_response_size null",
yaml: signingKeyLine + "upstream_max_response_size: null\n",
wantErrSubstrings: []string{keyUpstreamMaxResponseSize, nullValueText},
},
{
name: "upstream_max_response_size above 1 GiB",
yaml: signingKeyLine + "upstream_max_response_size: 1073741825\n",
wantErrSubstrings: []string{keyUpstreamMaxResponseSize, "1073741825"},
},
{
name: "upstream_max_response_size largest 64-bit integer",
yaml: signingKeyLine +
"upstream_max_response_size: 9223372036854775807\n",
wantErrSubstrings: []string{
keyUpstreamMaxResponseSize, "9223372036854775807",
},
},
}...)
}
// TestInvalidOriginTimeoutOrSizeAbortsStartup verifies the
// no-silent-fallback rule for the CORS origin, the two timeouts and the
// response size limit: a value that does not parse or is out of range
// aborts startup naming the key and the value.
func TestInvalidOriginTimeoutOrSizeAbortsStartup(t *testing.T) {
t.Parallel()
runAbortCases(t, append(invalidTimeoutCases(), invalidSizeAndOriginCases()...))
}
internal/config/env_internal_test.go
+38 -1
View File
@@ -8,6 +8,7 @@ import (
"slices"
"strings"
"testing"
"time"
"sneak.berlin/go/pixa/internal/globals"
"sneak.berlin/go/pixa/internal/logger"
@@ -66,9 +67,15 @@ func TestEnvironmentSetsEveryKey(t *testing.T) {
t.Setenv("PIXA_ALLOWLIST_HOSTS", "s3.sneak.cloud,.example.com")
t.Setenv("PIXA_ALLOW_HTTP", "true")
t.Setenv("PIXA_UPSTREAM_CONNECTIONS_PER_HOST", "5")
t.Setenv("PIXA_UPSTREAM_CONNECTIONS", "10")
t.Setenv("PIXA_MAX_CONCURRENT_PROCESSING", "3")
t.Setenv("PIXA_CACHE_MAX_BYTES", "1024")
t.Setenv("PIXA_BLOCKED_NETWORKS", "203.0.113.0/24")
t.Setenv("PIXA_TRUSTED_PROXIES", "192.0.2.0/24")
t.Setenv("PIXA_ACCESS_CONTROL_ALLOW_ORIGIN", "https://app.example.com")
t.Setenv("PIXA_UPSTREAM_FETCH_TIMEOUT", "10s")
t.Setenv("PIXA_UPSTREAM_MAX_RESPONSE_SIZE", "1048576")
t.Setenv("PIXA_DOWNSTREAM_TIMEOUT", "2m")
c, err := newFromSmartConfig(nil)
if err != nil {
@@ -88,10 +95,16 @@ func TestEnvironmentSetsEveryKey(t *testing.T) {
AllowlistHosts: []string{testHostS3, ".example.com"},
AllowHTTP: true,
UpstreamConnectionsPerHost: 5,
UpstreamConnections: 10,
MaxConcurrentProcessing: 3,
CacheMaxBytes: 1024,
cacheMaxBytesExplicit: true,
CacheMaxBytesExplicit: true,
BlockedNetworks: []netip.Prefix{netip.MustParsePrefix("203.0.113.0/24")},
TrustedProxies: []netip.Prefix{netip.MustParsePrefix("192.0.2.0/24")},
AccessControlAllowOrigin: "https://app.example.com",
UpstreamFetchTimeout: 10 * time.Second,
UpstreamMaxResponseSize: 1048576,
DownstreamTimeout: 2 * time.Minute,
}
if !reflect.DeepEqual(*c, want) {
@@ -280,6 +293,30 @@ func TestInvalidDebugFromEnvironmentAbortsStartup(t *testing.T) {
wantStartupError(t, err, "PIXA_DEBUG", "maybe")
}
// TestInvalidOriginTimeoutOrSizeFromEnvironmentAbortsStartup checks that
// an invalid CORS origin, timeout or response size limit in its variable
// aborts startup naming the variable and the value.
func TestInvalidOriginTimeoutOrSizeFromEnvironmentAbortsStartup(t *testing.T) {
cases := []struct {
variable string
value string
}{
{"PIXA_ACCESS_CONTROL_ALLOW_ORIGIN", "example.com"},
{"PIXA_UPSTREAM_FETCH_TIMEOUT", "soon"},
{"PIXA_UPSTREAM_MAX_RESPONSE_SIZE", "50MB"},
{"PIXA_DOWNSTREAM_TIMEOUT", "0s"},
}
for _, tc := range cases {
t.Run(tc.variable, func(t *testing.T) {
t.Setenv(tc.variable, tc.value)
_, err := configFromYAML(t, signingKeyLine)
wantStartupError(t, err, tc.variable, tc.value)
})
}
}
// TestConfigFileAloneBehavesAsBefore checks that with no variables set
// (TestMain unsets them) the config file's values are used and omitted
// keys take their defaults.
internal/database/concurrent_writes_internal_test.go
+153
View File
@@ -0,0 +1,153 @@
package database
import (
"context"
"database/sql"
"fmt"
"log/slog"
"path/filepath"
"sync"
"testing"
"sneak.berlin/go/pixa/internal/config"
)
// TestConcurrentWritesAllSucceed opens a database the way pixad does and
// writes to it from several goroutines at once, so the writes run on
// separate connections, as one request's writes and the background eviction
// pass do. Every write must succeed, none failing with "database is locked",
// whether or not db_url already has parameters, and the parameters it has
// must still apply.
func TestConcurrentWritesAllSucceed(t *testing.T) {
t.Parallel()
tests := []struct {
name string
query string
wantJournalMode string
}{
{
name: "db_url without parameters",
query: "",
wantJournalMode: "delete",
},
{
name: "db_url with the WAL parameter",
query: "?_pragma=journal_mode(WAL)",
wantJournalMode: "wal",
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
t.Parallel()
dbURL := "file:" + filepath.Join(t.TempDir(), "state.sqlite3") + tt.query
d := &Database{
log: slog.New(slog.DiscardHandler),
config: &config.Config{DBURL: dbURL},
}
err := d.connect(t.Context())
if err != nil {
t.Fatalf("failed to connect to %q: %v", dbURL, err)
}
t.Cleanup(func() { _ = d.db.Close() })
writeConcurrently(t, d.db)
var journalMode string
err = d.db.QueryRowContext(t.Context(), "PRAGMA journal_mode").
Scan(&journalMode)
if err != nil {
t.Fatalf("failed to read the journal mode: %v", err)
}
if journalMode != tt.wantJournalMode {
t.Errorf("journal mode = %q, want %q", journalMode, tt.wantJournalMode)
}
})
}
}
// writeConcurrently runs writeLikeOneRequest from several goroutines at once
// and checks that every write was made.
func writeConcurrently(t *testing.T, db *sql.DB) {
t.Helper()
const (
writers = 4
requestsEach = 20
totalRequests = writers * requestsEach
)
ctx := t.Context()
var wg sync.WaitGroup
for writer := range writers {
wg.Go(func() {
for request := range requestsEach {
key := fmt.Sprintf("%d-%d", writer, request)
err := writeLikeOneRequest(ctx, db, key)
if err != nil {
t.Errorf("writer %d: %v", writer, err)
return
}
}
})
}
wg.Wait()
var hits, sources int
err := db.QueryRowContext(ctx, `
SELECT hit_count, (SELECT COUNT(*) FROM source_content)
FROM cache_stats WHERE id = 1
`).Scan(&hits, &sources)
if err != nil {
t.Fatalf("failed to count the writes: %v", err)
}
if hits != totalRequests || sources != totalRequests {
t.Errorf("hit_count = %d and %d source_content rows, want %d of each",
hits, sources, totalRequests)
}
}
// writeLikeOneRequest makes the writes one request and the eviction pass
// make: it counts a cache hit, stores a source, records a transformed image
// and deletes that record again.
func writeLikeOneRequest(ctx context.Context, db *sql.DB, key string) error {
_, err := db.ExecContext(ctx,
`UPDATE cache_stats SET hit_count = hit_count + 1 WHERE id = 1`)
if err != nil {
return fmt.Errorf("counting a cache hit: %w", err)
}
_, err = db.ExecContext(ctx, `INSERT INTO source_content
(content_hash, content_type, size_bytes) VALUES (?, 'image/png', 1)`, key)
if err != nil {
return fmt.Errorf("storing a source: %w", err)
}
_, err = db.ExecContext(ctx, `INSERT INTO variant_content
(cache_key, size_bytes, content_type) VALUES (?, 1, 'image/png')`, key)
if err != nil {
return fmt.Errorf("recording a transformed image: %w", err)
}
_, err = db.ExecContext(ctx,
`DELETE FROM variant_content WHERE cache_key = ?`, key)
if err != nil {
return fmt.Errorf("evicting a transformed image: %w", err)
}
return nil
}
internal/database/database.go
+26 -18
View File
@@ -4,9 +4,9 @@ package database
import (
"context"
"database/sql"
"embed"
"errors"
"fmt"
"io/fs"
"log/slog"
"path/filepath"
"sort"
@@ -15,14 +15,12 @@ import (
"go.uber.org/fx"
"sneak.berlin/go/pixa/internal/config"
"sneak.berlin/go/pixa/internal/db/migrations"
"sneak.berlin/go/pixa/internal/logger"
_ "modernc.org/sqlite" // SQLite driver registration
)
//go:embed schema/*.sql
var schemaFS embed.FS
// bootstrapVersion is the migration that creates the schema_migrations
// table itself. It is applied before the normal migration loop.
const bootstrapVersion = 0
@@ -113,29 +111,29 @@ func New(lc fx.Lifecycle, params Params) (*Database, error) {
return s, nil
}
// collectMigrations reads the embedded schema directory and returns
// collectMigrations reads the embedded migrations directory and returns
// migration filenames sorted lexicographically.
func collectMigrations() ([]string, error) {
entries, err := schemaFS.ReadDir("schema")
entries, err := fs.ReadDir(migrations.FS(), ".")
if err != nil {
return nil, fmt.Errorf("failed to read schema directory: %w", err)
return nil, fmt.Errorf("failed to read migrations directory: %w", err)
}
var migrations []string
var filenames []string
for _, entry := range entries {
if !entry.IsDir() && strings.HasSuffix(entry.Name(), ".sql") {
migrations = append(migrations, entry.Name())
filenames = append(filenames, entry.Name())
}
}
sort.Strings(migrations)
sort.Strings(filenames)
return migrations, nil
return filenames, nil
}
// bootstrapMigrationsTable ensures the schema_migrations table exists
// by applying 000.sql if the table is missing.
// by applying 000_migration.sql if the table is missing.
func bootstrapMigrationsTable(ctx context.Context, db *sql.DB, log *slog.Logger) error {
var tableExists int
@@ -150,9 +148,9 @@ func bootstrapMigrationsTable(ctx context.Context, db *sql.DB, log *slog.Logger)
return nil
}
content, err := schemaFS.ReadFile("schema/000.sql")
content, err := fs.ReadFile(migrations.FS(), "000_migration.sql")
if err != nil {
return fmt.Errorf("failed to read bootstrap migration 000.sql: %w", err)
return fmt.Errorf("failed to read bootstrap migration 000_migration.sql: %w", err)
}
if log != nil {
@@ -177,12 +175,12 @@ func ApplyMigrations(ctx context.Context, db *sql.DB, log *slog.Logger) error {
return err
}
migrations, err := collectMigrations()
filenames, err := collectMigrations()
if err != nil {
return err
}
for _, migration := range migrations {
for _, migration := range filenames {
version, parseErr := ParseMigrationVersion(migration)
if parseErr != nil {
return parseErr
@@ -208,7 +206,7 @@ func ApplyMigrations(ctx context.Context, db *sql.DB, log *slog.Logger) error {
}
// Read and apply migration.
content, readErr := schemaFS.ReadFile(filepath.Join("schema", migration))
content, readErr := fs.ReadFile(migrations.FS(), migration)
if readErr != nil {
return fmt.Errorf("failed to read migration %s: %w", migration, readErr)
}
@@ -245,7 +243,17 @@ func (s *Database) DB() *sql.DB {
}
func (s *Database) connect(ctx context.Context) error {
dbURL := s.config.DBURL
// Requests and the eviction pass write on separate connections. With
// a busy timeout, a write that finds another one in progress waits up
// to five seconds for it instead of failing at once with "database is
// locked". The driver runs each _pragma parameter on every connection
// it opens.
separator := "?"
if strings.Contains(s.config.DBURL, "?") {
separator = "&"
}
dbURL := s.config.DBURL + separator + "_pragma=busy_timeout(5000)"
s.log.Info("connecting to database", "url", dbURL)
internal/database/migrations_internal_test.go
+54
View File
@@ -0,0 +1,54 @@
package database
import (
"bytes"
"database/sql"
"log/slog"
"path/filepath"
"strings"
"testing"
_ "modernc.org/sqlite" // SQLite driver registration
)
// TestApplyMigrations_SecondRunAppliesNothing applies the migrations twice
// to one database file, as happens when pixad starts again on the database
// it created, and checks that the second run applies none of them.
// ApplyMigrations logs a message starting with "applying" before it runs
// any migration, the bootstrap one included.
func TestApplyMigrations_SecondRunAppliesNothing(t *testing.T) {
t.Parallel()
ctx := t.Context()
db, err := sql.Open("sqlite", filepath.Join(t.TempDir(), "state.sqlite3"))
if err != nil {
t.Fatalf("failed to open test db: %v", err)
}
t.Cleanup(func() { _ = db.Close() })
var firstLog bytes.Buffer
err = ApplyMigrations(ctx, db, slog.New(slog.NewTextHandler(&firstLog, nil)))
if err != nil {
t.Fatalf("first ApplyMigrations failed: %v", err)
}
if !strings.Contains(firstLog.String(), "applying") {
t.Fatalf("first ApplyMigrations logged no applied migration:\n%s",
firstLog.String())
}
var secondLog bytes.Buffer
err = ApplyMigrations(ctx, db, slog.New(slog.NewTextHandler(&secondLog, nil)))
if err != nil {
t.Fatalf("second ApplyMigrations failed: %v", err)
}
if strings.Contains(secondLog.String(), "applying") {
t.Errorf("second ApplyMigrations ran a migration again:\n%s",
secondLog.String())
}
}
internal/database/schema/000.sql → internal/db/migrations/000_migration.sql
View File
internal/database/schema/001_initial_schema.sql → internal/db/migrations/001_schema.sql
+4 -3
View File
@@ -2,7 +2,7 @@
-- Creates all tables for the pixa caching image proxy
-- Source content blobs
-- Files stored at: cache/src-content/<ab>/<cd>/<sha256>
-- Files stored at: cache/sources/<ab>/<cd>/<sha256>
-- last_accessed_at is NULL until the first LRU touch; eviction falls
-- back to fetched_at for rows that have never been touched.
CREATE TABLE IF NOT EXISTS source_content (
@@ -16,7 +16,7 @@ CREATE INDEX IF NOT EXISTS idx_source_content_last_accessed
ON source_content(last_accessed_at);
-- Source URL metadata - maps URLs to content hashes
-- JSON stored at: cache/src-metadata/<hostname>/<path_hash>.json
-- JSON stored at: cache/metadata/<hostname>/<path_hash>.json
CREATE TABLE IF NOT EXISTS source_metadata (
id INTEGER PRIMARY KEY AUTOINCREMENT,
source_host TEXT NOT NULL,
@@ -56,7 +56,8 @@ CREATE INDEX IF NOT EXISTS idx_variant_content_last_accessed
ON variant_content(last_accessed_at);
-- Output/transformed content blobs
-- Files stored at: cache/dst-content/<ab>/<cd>/<sha256>
-- Not written: transformed images are stored in cache/variants and
-- tracked in variant_content above.
CREATE TABLE IF NOT EXISTS output_content (
content_hash TEXT PRIMARY KEY,
content_type TEXT NOT NULL,
internal/db/migrations/migrations.go
+15
View File
@@ -0,0 +1,15 @@
// Package migrations provides the embedded SQL migration files.
package migrations
import (
"embed"
"io/fs"
)
//go:embed *.sql
var files embed.FS
// FS returns the embedded filesystem containing the migration files.
func FS() fs.FS {
return files
}
internal/encurl/encurl.go
+8 -1
View File
@@ -103,7 +103,8 @@ func (g *Generator) Parse(token string) (*Payload, error) {
}
// ToImageRequest converts the payload to an ImageRequest.
// Applies default values for omitted optional fields.
// Applies default values for omitted optional fields. An ExpiresAt of 0, a URL
// that never expires, gives the zero Expires.
func (p *Payload) ToImageRequest() *imgcache.ImageRequest {
format := p.Format
if format == "" {
@@ -120,6 +121,11 @@ func (p *Payload) ToImageRequest() *imgcache.ImageRequest {
fitMode = DefaultFitMode
}
var expires time.Time
if p.ExpiresAt != 0 {
expires = time.Unix(p.ExpiresAt, 0)
}
return &imgcache.ImageRequest{
SourceHost: p.SourceHost,
SourcePath: p.SourcePath,
@@ -131,6 +137,7 @@ func (p *Payload) ToImageRequest() *imgcache.ImageRequest {
Format: format,
Quality: quality,
FitMode: fitMode,
Expires: expires,
}
}
internal/handlers/auth_login_log_internal_test.go
+59
View File
@@ -0,0 +1,59 @@
package handlers
import (
"bytes"
"log/slog"
"net/http"
"net/http/httptest"
"net/url"
"strings"
"testing"
"sneak.berlin/go/pixa/internal/config"
"sneak.berlin/go/pixa/internal/session"
)
// TestLoginLogLeavesOutSubmittedKey verifies that the log lines for a
// failed and for a successful login do not contain the submitted key.
func TestLoginLogLeavesOutSubmittedKey(t *testing.T) {
t.Parallel()
const wrongKey = "wrong-signing-key-fedcba9876543210"
var buf bytes.Buffer
sessMgr, err := session.NewManager(testSigningKey)
if err != nil {
t.Fatalf("session.NewManager() error = %v", err)
}
h := &Handlers{
log: slog.New(slog.NewJSONHandler(&buf, nil)),
config: &config.Config{SigningKey: testSigningKey},
sessMgr: sessMgr,
}
submittedKeys := []string{wrongKey, testSigningKey}
for _, key := range submittedKeys {
form := url.Values{loginKeyField: {key}}
req := httptest.NewRequestWithContext(
t.Context(), http.MethodPost, "/",
strings.NewReader(form.Encode()))
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
h.handleLoginPost(httptest.NewRecorder(), req)
}
for _, msg := range []string{"failed login attempt", "successful login"} {
if !strings.Contains(buf.String(), msg) {
t.Fatalf("log missing %q; got %q", msg, buf.String())
}
}
for _, key := range submittedKeys {
if strings.Contains(buf.String(), key) {
t.Errorf("log contains submitted key %q; got %q", key, buf.String())
}
}
}
internal/handlers/auth_session_internal_test.go
+243
View File
@@ -0,0 +1,243 @@
package handlers
import (
"log/slog"
"net/http"
"net/http/httptest"
"net/url"
"regexp"
"strings"
"testing"
"sneak.berlin/go/pixa/internal/imgcache"
"sneak.berlin/go/pixa/internal/session"
)
// formatField is the generator form's format field name.
const formatField = "format"
// Markers telling the login page from the generator page.
const (
loginForm = `action="/"`
loginKeyInput = `name="key"`
generatorForm = `action="/generate"`
)
// generatedURLPattern extracts the path of the URL the generator page shows.
// The test router runs with debug on, so the URL starts with http, and its
// host is httptest's default request host.
var generatedURLPattern = regexp.MustCompile(
`value="http://example\.com(/v1/e/[^"]+)"`)
// findSessionCookie returns the session cookie rec sets, or nil if it sets
// none.
func findSessionCookie(rec *httptest.ResponseRecorder) *http.Cookie {
for _, c := range rec.Result().Cookies() {
if c.Name == session.CookieName {
return c
}
}
return nil
}
// TestHandleRoot_NoSession_ShowsLoginForm verifies that GET / without a
// login session shows the login form.
func TestHandleRoot_NoSession_ShowsLoginForm(t *testing.T) {
t.Parallel()
_, srv := newCSRFTestRouter(t)
rec := httptest.NewRecorder()
srv.ServeHTTP(rec, httptest.NewRequestWithContext(
t.Context(), http.MethodGet, "/", nil))
if rec.Code != http.StatusOK {
t.Fatalf("status = %d, want %d", rec.Code, http.StatusOK)
}
body := rec.Body.String()
if !strings.Contains(body, loginForm) || !strings.Contains(body, loginKeyInput) {
t.Errorf("page is not the login form: %s", body)
}
}
// TestLoginPost_WrongKey_ShowsErrorWithoutSession verifies that a wrong key
// shows the login form again with an error, and sets no session cookie.
func TestLoginPost_WrongKey_ShowsErrorWithoutSession(t *testing.T) {
t.Parallel()
_, srv := newCSRFTestRouter(t)
cookies, token := csrfCredentials(t, srv, nil)
rec := postForm(srv, "/", cookies, url.Values{
loginKeyField: {"wrong-signing-key-fedcba9876543210"},
csrfTokenField: {token},
})
if rec.Code != http.StatusOK {
t.Fatalf("status = %d, want %d", rec.Code, http.StatusOK)
}
body := rec.Body.String()
if !strings.Contains(body, loginForm) || !strings.Contains(body, loginKeyInput) {
t.Errorf("page is not the login form: %s", body)
}
if !strings.Contains(body, "Invalid signing key") {
t.Error("login form does not show the error")
}
if c := findSessionCookie(rec); c != nil {
t.Errorf("wrong key set a session cookie: %s", c)
}
}
// TestLoginPost_RightKey_SetsSessionCookie verifies that the right key answers
// 303 to / with a session cookie marked Secure, HttpOnly and SameSite=Strict,
// and that GET / with that cookie shows the generator page.
func TestLoginPost_RightKey_SetsSessionCookie(t *testing.T) {
t.Parallel()
_, srv := newCSRFTestRouter(t)
cookies, token := csrfCredentials(t, srv, nil)
rec := postForm(srv, "/", cookies, url.Values{
loginKeyField: {testSigningKey},
csrfTokenField: {token},
})
if rec.Code != http.StatusSeeOther || rec.Header().Get("Location") != "/" {
t.Fatalf("status = %d, Location = %q, want %d to /",
rec.Code, rec.Header().Get("Location"), http.StatusSeeOther)
}
sessionCookie := findSessionCookie(rec)
if sessionCookie == nil {
t.Fatal("right key set no session cookie")
}
t.Logf("Set-Cookie: %s", sessionCookie)
if !sessionCookie.Secure {
t.Error("session cookie is not Secure")
}
if !sessionCookie.HttpOnly {
t.Error("session cookie is not HttpOnly")
}
if sessionCookie.SameSite != http.SameSiteStrictMode {
t.Errorf("session cookie SameSite = %v, want Strict", sessionCookie.SameSite)
}
req := httptest.NewRequestWithContext(t.Context(), http.MethodGet, "/", nil)
req.AddCookie(sessionCookie)
rec = httptest.NewRecorder()
srv.ServeHTTP(rec, req)
if rec.Code != http.StatusOK ||
!strings.Contains(rec.Body.String(), generatorForm) {
t.Errorf("GET / with the session cookie: status = %d, "+
"want %d and the generator page", rec.Code, http.StatusOK)
}
}
// TestHandleLogout_ClearsSessionCookie verifies that GET /logout answers 303
// to / and replaces the session cookie with an empty one sent with
// Max-Age=0, which makes the browser delete it.
func TestHandleLogout_ClearsSessionCookie(t *testing.T) {
t.Parallel()
h, _ := newCSRFTestRouter(t)
req := httptest.NewRequestWithContext(
t.Context(), http.MethodGet, "/logout", nil)
req.AddCookie(newSessionCookie(t, h))
rec := httptest.NewRecorder()
h.HandleLogout().ServeHTTP(rec, req)
if rec.Code != http.StatusSeeOther || rec.Header().Get("Location") != "/" {
t.Fatalf("status = %d, Location = %q, want %d to /",
rec.Code, rec.Header().Get("Location"), http.StatusSeeOther)
}
t.Logf("Set-Cookie: %s", rec.Header().Get("Set-Cookie"))
sessionCookie := findSessionCookie(rec)
if sessionCookie == nil {
t.Fatal("logout did not set the session cookie")
}
if sessionCookie.Value != "" {
t.Errorf("session cookie value = %q, want empty", sessionCookie.Value)
}
// net/http reads a Max-Age=0 attribute back as MaxAge -1.
if sessionCookie.MaxAge != -1 {
t.Errorf("session cookie MaxAge = %d, want -1 (Max-Age=0)",
sessionCookie.MaxAge)
}
}
// TestGeneratePost_NoSession_RedirectsToLogin verifies that POST /generate
// with a valid CSRF token but no login session answers 303 to / and makes no
// URL.
func TestGeneratePost_NoSession_RedirectsToLogin(t *testing.T) {
t.Parallel()
_, srv := newCSRFTestRouter(t)
cookies, token := csrfCredentials(t, srv, nil)
rec := postForm(srv, "/generate", cookies, url.Values{
sourceURLField: {testSourceURL},
csrfTokenField: {token},
})
if rec.Code != http.StatusSeeOther || rec.Header().Get("Location") != "/" {
t.Fatalf("status = %d, Location = %q, want %d to /",
rec.Code, rec.Header().Get("Location"), http.StatusSeeOther)
}
if strings.Contains(rec.Body.String(), "/v1/e/") {
t.Error("a URL was made without a login session")
}
}
// TestGeneratePost_URLServesImage verifies that the URL the generator page
// makes is served by /v1/e/. The image route runs on handlers of its own,
// made with the same signing key.
func TestGeneratePost_URLServesImage(t *testing.T) {
t.Parallel()
_, imageSrv := newSignedHostServer(t, slog.New(slog.DiscardHandler))
rec := generatePost(t, url.Values{
sourceURLField: {"https://" + signedHost + photoPath},
widthField: {"50"},
heightField: {"50"},
formatField: {string(imgcache.FormatJPEG)},
})
if rec.Code != http.StatusOK {
t.Fatalf("POST /generate status = %d, want %d", rec.Code, http.StatusOK)
}
match := generatedURLPattern.FindStringSubmatch(rec.Body.String())
if match == nil {
t.Fatalf("generator page shows no URL: %s", rec.Body.String())
}
t.Logf("generated URL path: %s", match[1])
imageRec := httptest.NewRecorder()
imageSrv.ServeHTTP(imageRec, httptest.NewRequestWithContext(
t.Context(), http.MethodGet, match[1], nil))
requireServedPhoto(t, imageRec)
}
internal/handlers/cache_max_bytes_internal_test.go
+147
View File
@@ -0,0 +1,147 @@
package handlers
import (
"os"
"path/filepath"
"testing"
"go.uber.org/fx/fxtest"
"sneak.berlin/go/pixa/internal/config"
"sneak.berlin/go/pixa/internal/database"
"sneak.berlin/go/pixa/internal/globals"
"sneak.berlin/go/pixa/internal/logger"
)
// TestNewCacheConfigFromCacheMaxBytes checks the cache configuration
// built from cache_max_bytes: omitted, the cache works out the default
// limit; 0 turns the disk cache off; a positive value is the limit,
// unchanged.
func TestNewCacheConfigFromCacheMaxBytes(t *testing.T) {
t.Parallel()
const oneGiB = 1 << 30
cases := []struct {
name string
cacheMaxBytes int64
cacheMaxBytesExplicit bool
wantMaxBytes int64
wantUseDefaultMaxBytes bool
wantDisableDiskCache bool
}{
{
name: "cache_max_bytes omitted",
cacheMaxBytes: 0,
cacheMaxBytesExplicit: false,
wantMaxBytes: 0,
wantUseDefaultMaxBytes: true,
wantDisableDiskCache: false,
},
{
name: "cache_max_bytes: 0",
cacheMaxBytes: 0,
cacheMaxBytesExplicit: true,
wantMaxBytes: 0,
wantUseDefaultMaxBytes: false,
wantDisableDiskCache: true,
},
{
name: "cache_max_bytes: 1 GiB",
cacheMaxBytes: oneGiB,
cacheMaxBytesExplicit: true,
wantMaxBytes: oneGiB,
wantUseDefaultMaxBytes: false,
wantDisableDiskCache: false,
},
}
for _, tc := range cases {
t.Run(tc.name, func(t *testing.T) {
t.Parallel()
cfg := &config.Config{
CacheMaxBytes: tc.cacheMaxBytes,
CacheMaxBytesExplicit: tc.cacheMaxBytesExplicit,
}
got := newCacheConfig(cfg, nil)
t.Logf("MaxBytes = %d, UseDefaultMaxBytes = %v, DisableDiskCache = %v",
got.MaxBytes, got.UseDefaultMaxBytes, got.DisableDiskCache)
if got.MaxBytes != tc.wantMaxBytes {
t.Errorf("MaxBytes = %d, want %d", got.MaxBytes, tc.wantMaxBytes)
}
if got.UseDefaultMaxBytes != tc.wantUseDefaultMaxBytes {
t.Errorf("UseDefaultMaxBytes = %v, want %v",
got.UseDefaultMaxBytes, tc.wantUseDefaultMaxBytes)
}
if got.DisableDiskCache != tc.wantDisableDiskCache {
t.Errorf("DisableDiskCache = %v, want %v",
got.DisableDiskCache, tc.wantDisableDiskCache)
}
})
}
}
// TestDiskCacheOffOnlyForExplicitZeroCacheMaxBytes starts the handlers
// once with cache_max_bytes omitted and once with cache_max_bytes: 0,
// and checks by whether the cache directories were created that the
// disk cache is on in the first case and off in the second.
func TestDiskCacheOffOnlyForExplicitZeroCacheMaxBytes(t *testing.T) {
t.Parallel()
cases := []struct {
name string
cacheMaxBytesExplicit bool
wantDiskCache bool
}{
{name: "cache_max_bytes omitted", cacheMaxBytesExplicit: false, wantDiskCache: true},
{name: "cache_max_bytes: 0", cacheMaxBytesExplicit: true, wantDiskCache: false},
}
for _, tc := range cases {
t.Run(tc.name, func(t *testing.T) {
t.Parallel()
stateDir := t.TempDir()
cfg := &config.Config{
SigningKey: testSigningKey,
StateDir: stateDir,
DBURL: "file:" + filepath.Join(stateDir, "state.sqlite3"),
CacheMaxBytes: 0,
CacheMaxBytesExplicit: tc.cacheMaxBytesExplicit,
}
lc := fxtest.NewLifecycle(t)
log, err := logger.New(lc, logger.Params{Globals: &globals.Globals{}})
if err != nil {
t.Fatalf("logger.New() error = %v", err)
}
db, err := database.New(lc, database.Params{Logger: log, Config: cfg})
if err != nil {
t.Fatalf("database.New() error = %v", err)
}
_, err = New(lc, Params{Logger: log, Database: db, Config: cfg})
if err != nil {
t.Fatalf("New() error = %v", err)
}
lc.RequireStart()
t.Cleanup(lc.RequireStop)
_, err = os.Stat(filepath.Join(stateDir, "cache", "variants"))
gotDiskCache := err == nil
if gotDiskCache != tc.wantDiskCache {
t.Errorf("cache directories created = %v, want %v",
gotDiskCache, tc.wantDiskCache)
}
})
}
}
internal/handlers/fetcher_internal_test.go
+61
View File
@@ -0,0 +1,61 @@
package handlers
import (
"net/http"
"net/netip"
"path/filepath"
"testing"
"time"
"github.com/go-chi/chi/v5"
"go.uber.org/fx"
"go.uber.org/fx/fxtest"
"sneak.berlin/go/pixa/internal/config"
"sneak.berlin/go/pixa/internal/database"
"sneak.berlin/go/pixa/internal/globals"
"sneak.berlin/go/pixa/internal/healthcheck"
"sneak.berlin/go/pixa/internal/logger"
)
// TestHandlersBuildTheirOwnFetcherWhenNoneIsProvided builds the handlers as
// pixad does, in an fx app that provides no fetcher, and requests an image
// from 192.0.2.10, which is on the allowlist and in blocked_networks. The URL
// check accepts that address; only the dialer that refuses internal
// addresses checks blocked_networks, so the answer is 403 only if the
// fetcher the handlers build from the config connects with that dialer. Any
// other dialer would try to connect until the upstream fetch timeout, which
// is short so that the test then fails quickly.
func TestHandlersBuildTheirOwnFetcherWhenNoneIsProvided(t *testing.T) {
t.Parallel()
const host = "192.0.2.10"
stateDir := t.TempDir()
cfg := &config.Config{
SigningKey: testSigningKey,
StateDir: stateDir,
DBURL: "file:" + filepath.Join(stateDir, "state.sqlite3"),
AllowlistHosts: []string{host},
BlockedNetworks: []netip.Prefix{netip.MustParsePrefix("192.0.2.0/24")},
UpstreamFetchTimeout: 2 * time.Second,
// With no connection slots, the fetch would fail before dialing.
UpstreamConnections: config.DefaultUpstreamConnections,
}
var h *Handlers
app := fxtest.New(t,
fx.Supply(cfg),
fx.Provide(globals.New, logger.New, database.New, healthcheck.New, New),
fx.Populate(&h),
)
app.RequireStart()
t.Cleanup(app.RequireStop)
r := chi.NewRouter()
r.Get("/v1/image/*", h.HandleImage())
rec := sendGet(t, r, photoURL(host))
checkErrorBody(t, rec, http.StatusForbidden, "forbidden")
}
internal/handlers/handlers.go
+47 -28
View File
@@ -27,6 +27,11 @@ type Params struct {
Healthcheck *healthcheck.Healthcheck
Database *database.Database
Config *config.Config
// Fetcher, when provided, fetches upstream images in place of the
// fetcher the handlers build from the config. Only tests provide one;
// pixad does not.
Fetcher httpfetcher.Fetcher `optional:"true"`
}
// Handlers provides HTTP request handlers.
@@ -35,6 +40,7 @@ type Handlers struct {
hc *healthcheck.Healthcheck
db *database.Database
config *config.Config
fetcher httpfetcher.Fetcher
imgSvc *imgcache.Service
imgCache *imgcache.Cache
sessMgr *session.Manager
@@ -54,45 +60,52 @@ func New(lc fx.Lifecycle, params Params) (*Handlers, error) {
hc: params.Healthcheck,
db: params.Database,
config: params.Config,
fetcher: params.Fetcher,
csrfProtect: csrfProtect,
}
lc.Append(fx.Hook{
// The eviction goroutine must outlive OnStart, so it cannot
// inherit this hook's context. It makes its own instead, which
// leaves it uncancellable: an in-flight pass runs to completion
// during OnStop regardless of the shutdown deadline. Making the
// loop cancellable changes shutdown semantics and is tracked
// separately in issue #102, rather than being folded into the
// lint-conformance change that surfaced it.
//nolint:contextcheck // see issue #102
//nolint:contextcheck // the eviction loop outlives OnStart; OnStop cancels it
OnStart: func(_ context.Context) error {
return s.initImageService()
},
OnStop: func(_ context.Context) error {
if s.imgCache != nil {
s.imgCache.StopEviction()
OnStop: func(ctx context.Context) error {
if s.imgCache == nil {
return nil
}
return nil
return s.imgCache.StopEviction(ctx)
},
})
return s, nil
}
// WaitForProcessing waits until no image is being processed, or until ctx
// ends, and returns how many images were still being processed then.
func (s *Handlers) WaitForProcessing(ctx context.Context) int {
return s.imgSvc.WaitForProcessing(ctx)
}
// newCacheConfig builds the image cache's configuration from cfg.
// cache_max_bytes: 0 disables the disk cache entirely; any other value
// is the eviction limit in bytes; when it is omitted, the cache works
// out the default limit itself.
func newCacheConfig(cfg *config.Config, log *slog.Logger) imgcache.CacheConfig {
return imgcache.CacheConfig{
StateDir: cfg.StateDir,
CacheTTL: imgcache.DefaultCacheTTL,
NegativeTTL: imgcache.DefaultNegativeTTL,
MaxBytes: cfg.CacheMaxBytes,
UseDefaultMaxBytes: !cfg.CacheMaxBytesExplicit,
DisableDiskCache: cfg.CacheMaxBytesExplicit && cfg.CacheMaxBytes == 0,
Logger: log,
}
}
// initImageService initializes the image cache and service.
func (s *Handlers) initImageService() error {
// Create the cache. cache_max_bytes: 0 disables the disk cache
// entirely; any other value is the eviction limit in bytes.
cache, err := imgcache.NewCache(s.db.DB(), imgcache.CacheConfig{
StateDir: s.config.StateDir,
CacheTTL: imgcache.DefaultCacheTTL,
NegativeTTL: imgcache.DefaultNegativeTTL,
MaxBytes: s.config.CacheMaxBytes,
DisableDiskCache: s.config.CacheMaxBytes == 0,
Logger: s.log,
})
cache, err := imgcache.NewCache(s.db.DB(), newCacheConfig(s.config, s.log))
if err != nil {
return err
}
@@ -106,20 +119,26 @@ func (s *Handlers) initImageService() error {
// Create the fetcher config
fetcherCfg := httpfetcher.DefaultConfig()
fetcherCfg.AllowHTTP = s.config.AllowHTTP
fetcherCfg.Timeout = s.config.UpstreamFetchTimeout
fetcherCfg.MaxResponseSize = s.config.UpstreamMaxResponseSize
if s.config.UpstreamConnectionsPerHost > 0 {
fetcherCfg.MaxConnectionsPerHost = s.config.UpstreamConnectionsPerHost
}
fetcherCfg.MaxConnections = s.config.UpstreamConnections
fetcherCfg.BlockedNetworks = s.config.BlockedNetworks
// Create the service
// Create the service. With no fetcher provided, it builds its own from
// fetcherCfg.
svc, err := imgcache.NewService(&imgcache.ServiceConfig{
Cache: cache,
FetcherConfig: fetcherCfg,
SigningKey: s.config.SigningKey,
Allowlist: s.config.AllowlistHosts,
Logger: s.log,
Cache: cache,
FetcherConfig: fetcherCfg,
Fetcher: s.fetcher,
SigningKey: s.config.SigningKey,
Allowlist: s.config.AllowlistHosts,
MaxConcurrentProcessing: s.config.MaxConcurrentProcessing,
Logger: s.log,
})
if err != nil {
return err
internal/handlers/image.go
+51 -12
View File
@@ -10,8 +10,10 @@ import (
"time"
"github.com/go-chi/chi/v5"
"github.com/go-chi/chi/v5/middleware"
"sneak.berlin/go/pixa/internal/encurl"
"sneak.berlin/go/pixa/internal/httpfetcher"
"sneak.berlin/go/pixa/internal/imageprocessor"
"sneak.berlin/go/pixa/internal/imgcache"
)
@@ -217,9 +219,54 @@ func (s *Handlers) respondImageError(
return
}
if errors.Is(err, httpfetcher.ErrTooManyConnections) ||
errors.Is(err, imageprocessor.ErrTooManyImages) {
s.respondError(w, "server busy, try again later",
http.StatusServiceUnavailable)
return
}
s.respondError(w, "internal error", http.StatusInternalServerError)
}
// cacheControl returns the Cache-Control header for an image served through a
// URL that expires at expires, or never when expires is the zero time. A cache
// may keep the image for a year, but not past the URL's expiry, after which
// pixa refuses the URL. The seconds left are rounded down and never negative.
// immutable only stops revalidation while the image is fresh, so it also ends
// at the expiry.
func cacheControl(expires time.Time) string {
const oneYear = 365 * 24 * time.Hour
maxAge := oneYear
if !expires.IsZero() {
maxAge = min(maxAge, max(time.Until(expires), 0))
}
return fmt.Sprintf("public, max-age=%d, immutable", int64(maxAge/time.Second))
}
// notModified sets the ETag header to etag and, when the request's
// If-None-Match is that ETag, answers 304 Not Modified. It reports whether it
// answered. An empty etag sets no header and never answers.
func notModified(w http.ResponseWriter, r *http.Request, etag string) bool {
if etag == "" {
return false
}
w.Header().Set("ETag", etag)
if r.Header.Get("If-None-Match") != etag {
return false
}
w.WriteHeader(http.StatusNotModified)
return true
}
// writeImageResponse writes headers and streams the image content,
// handling conditional and HEAD requests.
func (s *Handlers) writeImageResponse(
@@ -235,20 +282,11 @@ func (s *Handlers) writeImageResponse(
}
// Cache control headers
w.Header().Set("Cache-Control", "public, max-age=31536000, immutable")
w.Header().Set("Cache-Control", cacheControl(req.Expires))
w.Header().Set("X-Pixa-Cache", string(resp.CacheStatus))
if resp.ETag != "" {
w.Header().Set("ETag", resp.ETag)
// Check for conditional request (If-None-Match)
if ifNoneMatch := r.Header.Get("If-None-Match"); ifNoneMatch != "" {
if ifNoneMatch == resp.ETag {
w.WriteHeader(http.StatusNotModified)
return
}
}
if notModified(w, r, resp.ETag) {
return
}
// Handle HEAD request - return headers only
@@ -271,6 +309,7 @@ func (s *Handlers) writeImageResponse(
// Log cache status and timing after serving
duration := time.Since(startTime)
s.log.Info("image served",
"request_id", middleware.GetReqID(r.Context()),
"cache_key", cacheKey,
"cache_status", resp.CacheStatus,
"duration_ms", duration.Milliseconds(),
internal/handlers/image_cache_control_internal_test.go
+206
View File
@@ -0,0 +1,206 @@
package handlers
import (
"image/color"
"log/slog"
"net/http"
"net/http/httptest"
"strconv"
"strings"
"testing"
"testing/fstest"
"time"
"github.com/go-chi/chi/v5"
"sneak.berlin/go/pixa/internal/encurl"
"sneak.berlin/go/pixa/internal/imgcache"
)
// photoPath is the path of the JPEG that newSignedHostServer serves.
const photoPath = "/images/photo.jpg"
// newSignedHostServer returns a router for both image routes, and the Handlers
// behind it, whose fetcher serves a JPEG at photoPath on signedHost. signedHost
// is not on the allowlist, so a /v1/image/ URL for it is served only with a
// valid signature. The handlers and the image service log to log.
func newSignedHostServer(
t *testing.T, log *slog.Logger,
) (*Handlers, http.Handler) {
t.Helper()
cache, err := imgcache.NewCache(setupTestDB(t), imgcache.CacheConfig{
StateDir: t.TempDir(),
CacheTTL: time.Hour,
NegativeTTL: 5 * time.Minute,
})
if err != nil {
t.Fatalf("imgcache.NewCache() error = %v", err)
}
jpegData := generateTestJPEG(t, 100, 100, color.RGBA{255, 0, 0, 255})
svc, err := imgcache.NewService(&imgcache.ServiceConfig{
Cache: cache,
Fetcher: newMockFetcher(fstest.MapFS{
signedHost + photoPath: &fstest.MapFile{Data: jpegData},
}),
SigningKey: testSigningKey,
Logger: log,
})
if err != nil {
t.Fatalf("imgcache.NewService() error = %v", err)
}
encGen, err := encurl.NewGenerator(testSigningKey)
if err != nil {
t.Fatalf("encurl.NewGenerator() error = %v", err)
}
h := &Handlers{
log: log,
imgSvc: svc,
encGen: encGen,
}
r := chi.NewRouter()
r.Get("/v1/image/*", h.HandleImage())
r.Get("/v1/e/{token}/*", h.HandleImageEnc())
return h, r
}
// getMaxAge sends a GET for target to srv, requires a 200, and returns the
// max-age of the response's Cache-Control header, which must read
// "public, max-age=<seconds>, immutable".
func getMaxAge(t *testing.T, srv http.Handler, target string) int {
t.Helper()
req := httptest.NewRequestWithContext(t.Context(), http.MethodGet, target, nil)
rec := httptest.NewRecorder()
srv.ServeHTTP(rec, req)
header := rec.Header().Get("Cache-Control")
t.Logf("GET %s: %d, Cache-Control: %s", target, rec.Code, header)
if rec.Code != http.StatusOK {
t.Fatalf("status = %d, want %d", rec.Code, http.StatusOK)
}
value, hasPrefix := strings.CutPrefix(header, "public, max-age=")
value, hasSuffix := strings.CutSuffix(value, ", immutable")
maxAge, err := strconv.Atoi(value)
if !hasPrefix || !hasSuffix || err != nil {
t.Fatalf("Cache-Control = %q, want public, max-age=<seconds>, immutable",
header)
}
return maxAge
}
// TestHandleImage_SignedURL_MaxAgeEndsAtExp verifies that an image served
// through a signed URL expiring in 60 seconds may be cached for at most those
// 60 seconds. The lower bound of 50 shows the max-age is the time left, not 0.
func TestHandleImage_SignedURL_MaxAgeEndsAtExp(t *testing.T) {
t.Parallel()
h, srv := newSignedHostServer(t, slog.New(slog.DiscardHandler))
signedURL, err := h.imgSvc.GenerateSignedURL("", &imgcache.ImageRequest{
SourceHost: signedHost,
SourcePath: photoPath,
Size: imgcache.Size{Width: 50, Height: 50},
Format: imgcache.FormatJPEG,
}, time.Minute)
if err != nil {
t.Fatalf("GenerateSignedURL() error = %v", err)
}
maxAge := getMaxAge(t, srv, signedURL)
if maxAge < 50 || maxAge > 60 {
t.Errorf("max-age = %d, want 50 to 60", maxAge)
}
}
// TestHandleImage_AllowlistedHost_MaxAge verifies the max-age of an image from
// an allowlisted host, which is served without checking sig or exp. A URL with
// no exp may be cached for a year. A URL whose exp has passed is the one request
// that reaches the header after its expiry, and must get 0, never less.
func TestHandleImage_AllowlistedHost_MaxAge(t *testing.T) {
t.Parallel()
pastExp := strconv.FormatInt(time.Now().Add(-time.Hour).Unix(), 10)
tests := []struct {
name string
query string
wantMaxAge int
}{
{"no exp", "", 31536000},
{"exp already past", "?exp=" + pastExp, 0},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
t.Parallel()
fix := setupTestHandler(t)
r := chi.NewRouter()
r.Get("/v1/image/*", fix.handler.HandleImage())
maxAge := getMaxAge(t, r,
"/v1/image/"+fix.goodHost+"/images/photo.jpg/50x50.jpeg"+tt.query)
if maxAge != tt.wantMaxAge {
t.Errorf("max-age = %d, want %d", maxAge, tt.wantMaxAge)
}
})
}
}
// TestHandleImageEnc_MaxAge verifies that an image served through an encrypted
// URL with a 60 second TTL may be cached for at most those 60 seconds, that one
// with a two-year TTL may be cached for a year, and that one made without a
// TTL, which never expires, may be cached for a year.
func TestHandleImageEnc_MaxAge(t *testing.T) {
t.Parallel()
tests := []struct {
name string
expiresAt int64
wantAtLeast int
wantAtMost int
}{
{"60 second TTL", time.Now().Add(time.Minute).Unix(), 50, 60},
{"two-year TTL", time.Now().Add(2 * 365 * 24 * time.Hour).Unix(), 31536000, 31536000},
{"no TTL", 0, 31536000, 31536000},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
t.Parallel()
h, srv := newSignedHostServer(t, slog.New(slog.DiscardHandler))
token, err := h.encGen.Generate(&encurl.Payload{
SourceHost: signedHost,
SourcePath: photoPath,
Width: 50,
Height: 50,
Format: imgcache.FormatJPEG,
ExpiresAt: tt.expiresAt,
})
if err != nil {
t.Fatalf("Generate() error = %v", err)
}
maxAge := getMaxAge(t, srv, "/v1/e/"+token+"/img.jpg")
if maxAge < tt.wantAtLeast || maxAge > tt.wantAtMost {
t.Errorf("max-age = %d, want %d to %d",
maxAge, tt.wantAtLeast, tt.wantAtMost)
}
})
}
}
internal/handlers/image_errors_internal_test.go
+267
View File
@@ -0,0 +1,267 @@
package handlers
import (
"encoding/json"
"fmt"
"image/color"
"log/slog"
"net/http"
"net/http/httptest"
"strings"
"testing"
"testing/fstest"
"time"
"github.com/go-chi/chi/v5"
"sneak.berlin/go/pixa/internal/httpfetcher"
"sneak.berlin/go/pixa/internal/imgcache"
"sneak.berlin/go/pixa/internal/signature"
)
// allowlistedHost is the only host on the allowlist of the image route
// newImageRoute builds.
const allowlistedHost = "allowed.example.com"
// newImageRoute returns the image route of a Handlers whose service fetches
// with fetcher and checks signatures with testSigningKey.
func newImageRoute(t *testing.T, fetcher httpfetcher.Fetcher) http.Handler {
t.Helper()
cache, err := imgcache.NewCache(setupTestDB(t), imgcache.CacheConfig{
StateDir: t.TempDir(),
CacheTTL: time.Hour,
NegativeTTL: 5 * time.Minute,
})
if err != nil {
t.Fatalf("failed to create cache: %v", err)
}
svc, err := imgcache.NewService(&imgcache.ServiceConfig{
Cache: cache,
Fetcher: fetcher,
SigningKey: testSigningKey,
Allowlist: []string{allowlistedHost},
})
if err != nil {
t.Fatalf("failed to create service: %v", err)
}
h := &Handlers{imgSvc: svc, log: slog.New(slog.DiscardHandler)}
r := chi.NewRouter()
r.Get("/v1/image/*", h.HandleImage())
return r
}
// newPhotoFetcher returns a mock fetcher that serves a JPEG at photoPath on
// each of hosts, and answers any other URL with an upstream error.
func newPhotoFetcher(t *testing.T, hosts ...string) *httpfetcher.MockFetcher {
t.Helper()
photo := &fstest.MapFile{
Data: generateTestJPEG(t, 100, 100, color.RGBA{255, 0, 0, 255}),
}
files := fstest.MapFS{}
for _, host := range hosts {
files[host+photoPath] = photo
}
return httpfetcher.NewMock(files)
}
// photoURL returns the image route URL of photoPath on host, as a 50x50 JPEG.
func photoURL(host string) string {
return "/v1/image/" + host + photoPath + "/50x50.jpeg"
}
// photoURLWithSig returns photoURL(host) with sig and expires as its sig and
// exp.
func photoURLWithSig(host, sig string, expires time.Time) string {
return fmt.Sprintf("%s?sig=%s&exp=%d", photoURL(host), sig, expires.Unix())
}
// photoSignature returns the signature of photoURL(host) at the default
// quality and fit, made with key and expiring at expires.
func photoSignature(key, host string, expires time.Time) string {
return signature.New(key).Sign(&signature.Request{
SourceHost: host,
SourcePath: photoPath,
Width: 50,
Height: 50,
Format: string(imgcache.FormatJPEG),
Quality: 85,
FitMode: string(imgcache.FitCover),
Expires: expires,
})
}
// sendGet sends a GET for target to route and returns the response.
func sendGet(
t *testing.T, route http.Handler, target string,
) *httptest.ResponseRecorder {
t.Helper()
req := httptest.NewRequestWithContext(t.Context(), http.MethodGet, target, nil)
rec := httptest.NewRecorder()
route.ServeHTTP(rec, req)
t.Logf("GET %s: %d", target, rec.Code)
return rec
}
// checkErrorBody checks that rec has status wantStatus and the JSON error body
// the image route sends: wantError, wantStatus and the time in RFC 3339.
func checkErrorBody(
t *testing.T, rec *httptest.ResponseRecorder, wantStatus int, wantError string,
) {
t.Helper()
if rec.Code != wantStatus {
t.Errorf("status = %d, want %d", rec.Code, wantStatus)
}
if ct := rec.Header().Get("Content-Type"); ct != "application/json" {
t.Errorf("Content-Type = %q, want application/json", ct)
}
var body struct {
Error string `json:"error"`
Status int `json:"status"`
Timestamp string `json:"timestamp"`
}
err := json.NewDecoder(rec.Body).Decode(&body)
if err != nil {
t.Fatalf("decoding response body: %v", err)
}
if body.Error != wantError || body.Status != wantStatus {
t.Errorf("body error and status = %q %d, want %q %d",
body.Error, body.Status, wantError, wantStatus)
}
_, err = time.Parse(time.RFC3339, body.Timestamp)
if err != nil {
t.Errorf("body timestamp: %v", err)
}
}
// TestHandleImage_ErrorAnswers checks the status and the JSON error body the
// image route answers each request below with. The JPEG at photoPath exists on
// signedHost and on each host below that differs from it, so a request refused
// with 401 would otherwise be served.
func TestHandleImage_ErrorAnswers(t *testing.T) {
t.Parallel()
// A signature for signedHost must not verify for any of these.
parentHost := "example.com"
siblingHost := "other.example.com"
subdomainHost := "img." + signedHost
appendedHost := signedHost + ".example.net"
photos := newPhotoFetcher(t,
signedHost, parentHost, siblingHost, subdomainHost, appendedHost)
// The real fetcher refuses localhost before any lookup or connection.
realFetcher := httpfetcher.New(httpfetcher.DefaultConfig())
exp := time.Now().Add(time.Hour)
expired := time.Now().Add(-time.Hour)
sig := photoSignature(testSigningKey, signedHost, exp)
otherKeySig := photoSignature("another-signing-key", signedHost, exp)
expiredSig := photoSignature(testSigningKey, signedHost, expired)
localhostSig := photoSignature(testSigningKey, "localhost", exp)
// The error every request refused for its signature gets.
const unauthorized = "unauthorized"
tests := []struct {
name string
fetcher httpfetcher.Fetcher
target string
wantStatus int
wantError string
}{
{"no sig or exp", photos, photoURL(signedHost),
http.StatusUnauthorized, unauthorized},
{"exp but no sig", photos,
fmt.Sprintf("%s?exp=%d", photoURL(signedHost), exp.Unix()),
http.StatusUnauthorized, unauthorized},
{"sig made with another key", photos,
photoURLWithSig(signedHost, otherKeySig, exp),
http.StatusUnauthorized, unauthorized},
{"sig without its = padding", photos,
photoURLWithSig(signedHost, strings.TrimRight(sig, "="), exp),
http.StatusUnauthorized, unauthorized},
{"sig in upper case", photos,
photoURLWithSig(signedHost, strings.ToUpper(sig), exp),
http.StatusUnauthorized, unauthorized},
{"expired sig", photos, photoURLWithSig(signedHost, expiredSig, expired),
http.StatusUnauthorized, unauthorized},
{"sig sent for the parent domain", photos,
photoURLWithSig(parentHost, sig, exp),
http.StatusUnauthorized, unauthorized},
{"sig sent for a sibling host", photos,
photoURLWithSig(siblingHost, sig, exp),
http.StatusUnauthorized, unauthorized},
{"sig sent for a subdomain", photos,
photoURLWithSig(subdomainHost, sig, exp),
http.StatusUnauthorized, unauthorized},
{"sig sent with another domain appended", photos,
photoURLWithSig(appendedHost, sig, exp),
http.StatusUnauthorized, unauthorized},
{"unparseable path", photos,
"/v1/image/" + allowlistedHost + photoPath + "/big.jpeg",
http.StatusBadRequest, "invalid image URL: invalid size format"},
{"blocked upstream address", realFetcher,
photoURLWithSig("localhost", localhostSig, exp),
http.StatusForbidden, "forbidden"},
{"upstream error", photos,
"/v1/image/" + allowlistedHost + "/images/missing.jpg/50x50.jpeg",
http.StatusBadGateway, "upstream error"},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
t.Parallel()
rec := sendGet(t, newImageRoute(t, tt.fetcher), tt.target)
checkErrorBody(t, rec, tt.wantStatus, tt.wantError)
})
}
}
// TestHandleImage_AllowlistOrSignature checks that the image route serves an
// image without a signature for a host on the allowlist only, and for another
// host only with a valid signature.
func TestHandleImage_AllowlistOrSignature(t *testing.T) {
t.Parallel()
photos := newPhotoFetcher(t, allowlistedHost, signedHost)
exp := time.Now().Add(time.Hour)
sig := photoSignature(testSigningKey, signedHost, exp)
tests := []struct {
name string
target string
wantStatus int
}{
{"allowlisted host, no sig", photoURL(allowlistedHost), http.StatusOK},
{"other host, no sig", photoURL(signedHost), http.StatusUnauthorized},
{"other host, valid sig", photoURLWithSig(signedHost, sig, exp),
http.StatusOK},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
t.Parallel()
rec := sendGet(t, newImageRoute(t, photos), tt.target)
if rec.Code != tt.wantStatus {
t.Errorf("status = %d, want %d", rec.Code, tt.wantStatus)
}
})
}
}
internal/handlers/image_signature_internal_test.go
+3 -3
View File
@@ -14,9 +14,9 @@ import (
)
// signedHost is not on the allowlist setupTestHandler builds, so a request
// for it needs a valid signature. No image is served for it: a request that
// passes the signature check gets 502 from the failed fetch, and one that
// fails the check gets 401.
// for it needs a valid signature. setupTestHandler serves no image for it: a
// request that passes the signature check gets 502 from the failed fetch, and
// one that fails the check gets 401.
const signedHost = "signed.example.com"
// getImage sends a GET for target to the image route of fix and returns the
internal/handlers/imageenc.go
+72 -39
View File
@@ -9,9 +9,11 @@ import (
"time"
"github.com/go-chi/chi/v5"
"github.com/go-chi/chi/v5/middleware"
"sneak.berlin/go/pixa/internal/encurl"
"sneak.berlin/go/pixa/internal/httpfetcher"
"sneak.berlin/go/pixa/internal/imageprocessor"
"sneak.berlin/go/pixa/internal/imgcache"
)
@@ -23,43 +25,8 @@ func (s *Handlers) HandleImageEnc() http.HandlerFunc {
ctx := r.Context()
start := time.Now()
// Extract token from URL
token := chi.URLParam(r, "token")
if token == "" {
s.respondError(w, "missing token", http.StatusBadRequest)
return
}
// Decrypt and validate the payload
payload, err := s.encGen.Parse(token)
if err != nil {
if errors.Is(err, encurl.ErrExpired) {
s.log.Debug("encrypted URL expired", "error", err)
s.respondError(w, "URL has expired", http.StatusGone)
return
}
s.log.Debug("failed to decrypt URL", "error", err)
s.respondError(w, "invalid encrypted URL", http.StatusBadRequest)
return
}
// Convert payload to ImageRequest
req := payload.ToImageRequest()
// Apply the same dimension and fit-mode bounds as the plain image
// route: a sealed payload is trusted for its origin, not for staying
// within limits, so an over-limit size or unknown fit mode is a 400
// here rather than an out-of-memory or a 500 from the processor.
err = imgcache.ValidateImageRequest(req)
if err != nil {
s.log.Debug("encrypted URL failed validation", "error", err)
s.respondError(w, "invalid encrypted URL: "+err.Error(),
http.StatusBadRequest)
req, ok := s.parseImageEncRequest(w, r)
if !ok {
return
}
@@ -89,10 +56,21 @@ func (s *Handlers) HandleImageEnc() http.HandlerFunc {
w.Header().Set("Content-Length", strconv.FormatInt(resp.ContentLength, 10))
}
// Cache headers - encrypted URLs can be cached since they're immutable
w.Header().Set("Cache-Control", "public, max-age=31536000, immutable")
// Cache headers: max-age ends at the URL's expiry
w.Header().Set("Cache-Control", cacheControl(req.Expires))
w.Header().Set("X-Pixa-Cache", string(resp.CacheStatus))
if notModified(w, r, resp.ETag) {
return
}
// A HEAD request gets the headers only
if r.Method == http.MethodHead {
w.WriteHeader(http.StatusOK)
return
}
// Stream the response
written, err := io.Copy(w, resp.Content)
if err != nil {
@@ -104,6 +82,7 @@ func (s *Handlers) HandleImageEnc() http.HandlerFunc {
// Log completion
duration := time.Since(start)
s.log.Info("image served",
"request_id", middleware.GetReqID(ctx),
"cache_key", imgcache.CacheKey(req),
"host", req.SourceHost,
"path", req.SourcePath,
@@ -115,6 +94,56 @@ func (s *Handlers) HandleImageEnc() http.HandlerFunc {
}
}
// parseImageEncRequest decrypts the token of an encrypted image URL into an
// ImageRequest and checks it. On a token that is missing, does not decrypt,
// has expired or asks for something not valid, it writes an error response
// and returns false.
func (s *Handlers) parseImageEncRequest(
w http.ResponseWriter, r *http.Request,
) (*imgcache.ImageRequest, bool) {
// Extract token from URL
token := chi.URLParam(r, "token")
if token == "" {
s.respondError(w, "missing token", http.StatusBadRequest)
return nil, false
}
// Decrypt and validate the payload
payload, err := s.encGen.Parse(token)
if err != nil {
if errors.Is(err, encurl.ErrExpired) {
s.log.Debug("encrypted URL expired", "error", err)
s.respondError(w, "URL has expired", http.StatusGone)
return nil, false
}
s.log.Debug("failed to decrypt URL", "error", err)
s.respondError(w, "invalid encrypted URL", http.StatusBadRequest)
return nil, false
}
// Convert payload to ImageRequest
req := payload.ToImageRequest()
// Apply the same dimension and fit-mode bounds as the plain image
// route: a sealed payload is trusted for its origin, not for staying
// within limits, so an over-limit size or unknown fit mode is a 400
// here rather than an out-of-memory or a 500 from the processor.
err = imgcache.ValidateImageRequest(req)
if err != nil {
s.log.Debug("encrypted URL failed validation", "error", err)
s.respondError(w, "invalid encrypted URL: "+err.Error(),
http.StatusBadRequest)
return nil, false
}
return req, true
}
// handleImageError converts image service errors to HTTP responses.
func (s *Handlers) handleImageError(w http.ResponseWriter, err error) {
switch {
@@ -124,6 +153,10 @@ func (s *Handlers) handleImageError(w http.ResponseWriter, err error) {
s.respondError(w, "upstream error", http.StatusBadGateway)
case errors.Is(err, httpfetcher.ErrUpstreamTimeout):
s.respondError(w, "upstream timeout", http.StatusGatewayTimeout)
case errors.Is(err, httpfetcher.ErrTooManyConnections),
errors.Is(err, imageprocessor.ErrTooManyImages):
s.respondError(w, "server busy, try again later",
http.StatusServiceUnavailable)
default:
s.log.Error("image request failed", "error", err)
s.respondError(w, "internal error", http.StatusInternalServerError)
internal/handlers/imageenc_internal_test.go
+67
View File
@@ -96,3 +96,70 @@ func TestHandleImageEnc_InvalidFitMode_Returns400(t *testing.T) {
t.Fatalf("status = %d, want %d", rec.Code, http.StatusBadRequest)
}
}
// TestHandleImageEnc_IfNoneMatch_Returns304 verifies that an image served
// through an encrypted URL carries an ETag, and that a request whose
// If-None-Match is that ETag is answered 304 Not Modified with no body.
func TestHandleImageEnc_IfNoneMatch_Returns304(t *testing.T) {
t.Parallel()
h, srv := newSignedHostServer(t, slog.New(slog.DiscardHandler))
target := encPhotoURL(t, h)
rec := httptest.NewRecorder()
srv.ServeHTTP(rec, httptest.NewRequestWithContext(
t.Context(), http.MethodGet, target, nil))
etag := rec.Header().Get("ETag")
t.Logf("GET: %d, ETag %q", rec.Code, etag)
if rec.Code != http.StatusOK || etag == "" {
t.Fatalf("GET: status = %d, ETag = %q, want %d and an ETag",
rec.Code, etag, http.StatusOK)
}
req := httptest.NewRequestWithContext(t.Context(), http.MethodGet, target, nil)
req.Header.Set("If-None-Match", etag)
rec = httptest.NewRecorder()
srv.ServeHTTP(rec, req)
t.Logf("GET with If-None-Match: %d, %d body bytes", rec.Code, rec.Body.Len())
if rec.Code != http.StatusNotModified || rec.Body.Len() != 0 {
t.Errorf("status = %d with %d body bytes, want %d with none",
rec.Code, rec.Body.Len(), http.StatusNotModified)
}
}
// TestHandleImageEnc_HEAD_ReturnsHeadersOnly verifies that HEAD on an
// encrypted URL is answered 200 with the headers GET sends and no body.
func TestHandleImageEnc_HEAD_ReturnsHeadersOnly(t *testing.T) {
t.Parallel()
h, _ := newSignedHostServer(t, slog.New(slog.DiscardHandler))
r := chi.NewRouter()
r.Head("/v1/e/{token}/*", h.HandleImageEnc())
rec := httptest.NewRecorder()
r.ServeHTTP(rec, httptest.NewRequestWithContext(
t.Context(), http.MethodHead, encPhotoURL(t, h), nil))
t.Logf("HEAD: %d, headers %v, %d body bytes",
rec.Code, rec.Header(), rec.Body.Len())
if rec.Code != http.StatusOK {
t.Fatalf("status = %d, want %d", rec.Code, http.StatusOK)
}
for _, name := range []string{
"Content-Type", "Content-Length", "Cache-Control", "ETag",
} {
if rec.Header().Get(name) == "" {
t.Errorf("HEAD response has no %s", name)
}
}
if rec.Body.Len() != 0 {
t.Errorf("HEAD response body has %d bytes, want none", rec.Body.Len())
}
}
internal/handlers/imageenc_token_internal_test.go
+126
View File
@@ -0,0 +1,126 @@
package handlers
import (
"image/jpeg"
"log/slog"
"net/http"
"net/http/httptest"
"testing"
"time"
"sneak.berlin/go/pixa/internal/encurl"
)
// requireServedPhoto requires that rec answers 200 with the JPEG at photoPath
// on signedHost at the 50x50 that encPhotoURL and the generator tests ask for.
func requireServedPhoto(t *testing.T, rec *httptest.ResponseRecorder) {
t.Helper()
if rec.Code != http.StatusOK {
t.Fatalf("status = %d, want %d; body %q",
rec.Code, http.StatusOK, rec.Body.String())
}
contentType := rec.Header().Get("Content-Type")
if contentType != "image/jpeg" {
t.Errorf("Content-Type = %q, want image/jpeg", contentType)
}
img, err := jpeg.DecodeConfig(rec.Body)
if err != nil {
t.Fatalf("body is not a JPEG: %v", err)
}
if img.Width != 50 || img.Height != 50 {
t.Errorf("image is %dx%d, want 50x50", img.Width, img.Height)
}
}
// TestHandleImageEnc_ValidToken_ServesImage verifies that a token made with
// the signing key serves the image it asks for.
func TestHandleImageEnc_ValidToken_ServesImage(t *testing.T) {
t.Parallel()
h, srv := newSignedHostServer(t, slog.New(slog.DiscardHandler))
rec := httptest.NewRecorder()
srv.ServeHTTP(rec, httptest.NewRequestWithContext(
t.Context(), http.MethodGet, encPhotoURL(t, h), nil))
requireServedPhoto(t, rec)
}
// TestHandleImageEnc_RejectedToken verifies that a token that has expired
// answers 410, and that a token with one character changed, a token cut
// short, and a token made with another signing key answer 400. The server
// would serve the photo for a token it accepted.
func TestHandleImageEnc_RejectedToken(t *testing.T) {
t.Parallel()
h, srv := newSignedHostServer(t, slog.New(slog.DiscardHandler))
photo := encurl.Payload{
SourceHost: signedHost,
SourcePath: photoPath,
Width: 50,
Height: 50,
}
valid, err := h.encGen.Generate(&photo)
if err != nil {
t.Fatalf("Generate() error = %v", err)
}
expiredPhoto := photo
expiredPhoto.ExpiresAt = time.Now().Add(-time.Minute).Unix()
expired, err := h.encGen.Generate(&expiredPhoto)
if err != nil {
t.Fatalf("Generate() error = %v", err)
}
otherGen, err := encurl.NewGenerator("another-signing-key-fedcba9876543210")
if err != nil {
t.Fatalf("encurl.NewGenerator() error = %v", err)
}
otherKey, err := otherGen.Generate(&photo)
if err != nil {
t.Fatalf("Generate() error = %v", err)
}
// Changing a character in the middle always changes the decoded bytes;
// the last character of unpadded base64 can carry unused bits.
middle := len(valid) / 2
replacement := "A"
if valid[middle] == 'A' {
replacement = "B"
}
changed := valid[:middle] + replacement + valid[middle+1:]
tests := []struct {
name string
token string
wantStatus int
}{
{"expired", expired, http.StatusGone},
{"one character changed", changed, http.StatusBadRequest},
{"cut short", valid[:middle], http.StatusBadRequest},
{"another signing key", otherKey, http.StatusBadRequest},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
t.Parallel()
rec := getEncToken(srv, tt.token)
t.Logf("GET /v1/e/%s/img.jpg: %d %s", tt.token, rec.Code, rec.Body)
if rec.Code != tt.wantStatus {
t.Errorf("status = %d, want %d", rec.Code, tt.wantStatus)
}
})
}
}
internal/handlers/request_id_internal_test.go
+131
View File
@@ -0,0 +1,131 @@
package handlers
import (
"bytes"
"context"
"encoding/json"
"io"
"log/slog"
"net/http"
"net/http/httptest"
"testing"
"time"
"github.com/go-chi/chi/v5/middleware"
"sneak.berlin/go/pixa/internal/encurl"
"sneak.berlin/go/pixa/internal/imgcache"
)
// signedPhotoURL returns a signed /v1/image/ URL, valid for a minute, for the
// JPEG at photoPath on signedHost at 50x50, made with h's image service.
func signedPhotoURL(t *testing.T, h *Handlers) string {
t.Helper()
signedURL, err := h.imgSvc.GenerateSignedURL("", &imgcache.ImageRequest{
SourceHost: signedHost,
SourcePath: photoPath,
Size: imgcache.Size{Width: 50, Height: 50},
Format: imgcache.FormatJPEG,
}, time.Minute)
if err != nil {
t.Fatalf("GenerateSignedURL() error = %v", err)
}
return signedURL
}
// encPhotoURL returns an encrypted /v1/e/ URL, which never expires, for the
// JPEG at photoPath on signedHost at 50x50, made with h's generator.
func encPhotoURL(t *testing.T, h *Handlers) string {
t.Helper()
token, err := h.encGen.Generate(&encurl.Payload{
SourceHost: signedHost,
SourcePath: photoPath,
Width: 50,
Height: 50,
Format: imgcache.FormatJPEG,
})
if err != nil {
t.Fatalf("Generate() error = %v", err)
}
return "/v1/e/" + token + "/img.jpg"
}
// requestIDByMessage reads the JSON log lines in logs and returns the
// request_id of each line, by its message.
func requestIDByMessage(t *testing.T, logs io.Reader) map[string]string {
t.Helper()
logged := make(map[string]string)
dec := json.NewDecoder(logs)
for dec.More() {
var line map[string]any
err := dec.Decode(&line)
if err != nil {
t.Fatalf("decoding log line: %v", err)
}
msg, _ := line["msg"].(string)
requestID, _ := line["request_id"].(string)
logged[msg] = requestID
}
return logged
}
// TestImageLogLinesCarryRequestID verifies that the lines logged when an image
// is fetched, converted and served through either image route carry the
// request's ID as request_id, as the request log line does, so they can be
// found from it.
func TestImageLogLinesCarryRequestID(t *testing.T) {
t.Parallel()
const requestID = "test-request-id"
imageURLs := map[string]func(*testing.T, *Handlers) string{
"/v1/image/": signedPhotoURL,
"/v1/e/": encPhotoURL,
}
for route, imageURL := range imageURLs {
t.Run(route, func(t *testing.T) {
t.Parallel()
var logs bytes.Buffer
h, srv := newSignedHostServer(t,
slog.New(slog.NewJSONHandler(&logs, nil)))
ctx := context.WithValue(t.Context(),
middleware.RequestIDKey, requestID)
rec := httptest.NewRecorder()
srv.ServeHTTP(rec, httptest.NewRequestWithContext(
ctx, http.MethodGet, imageURL(t, h), nil))
if rec.Code != http.StatusOK {
t.Fatalf("status = %d, want %d", rec.Code, http.StatusOK)
}
t.Logf("logged:\n%s", logs.String())
logged := requestIDByMessage(t, &logs)
for _, msg := range []string{
"upstream fetched", "image converted", "image served",
} {
got, ok := logged[msg]
if !ok {
t.Errorf("no %q line logged", msg)
} else if got != requestID {
t.Errorf("%q line has request_id %q, want %q",
msg, got, requestID)
}
}
})
}
}
internal/handlers/robots_healthcheck_internal_test.go
+90
View File
@@ -0,0 +1,90 @@
package handlers
import (
"encoding/json"
"log/slog"
"net/http"
"testing"
"go.uber.org/fx/fxtest"
"sneak.berlin/go/pixa/internal/config"
"sneak.berlin/go/pixa/internal/globals"
"sneak.berlin/go/pixa/internal/healthcheck"
"sneak.berlin/go/pixa/internal/logger"
)
// TestHandleRobotsTxt checks that /robots.txt asks every crawler to stay off
// the whole site.
func TestHandleRobotsTxt(t *testing.T) {
t.Parallel()
h := &Handlers{log: slog.New(slog.DiscardHandler)}
rec := sendGet(t, h.HandleRobotsTxt(), "/robots.txt")
if rec.Code != http.StatusOK {
t.Errorf("status = %d, want %d", rec.Code, http.StatusOK)
}
if ct := rec.Header().Get("Content-Type"); ct != "text/plain" {
t.Errorf("Content-Type = %q, want text/plain", ct)
}
want := "User-agent: *\nDisallow: /\n"
if rec.Body.String() != want {
t.Errorf("body = %q, want %q", rec.Body.String(), want)
}
}
// TestHandleHealthCheck checks that the health check answers 200 with status
// ok, the app's name and version, now, uptime_seconds, uptime_human and
// maintenance_mode, which is true here: the health check stays 200 while
// maintenance mode is on.
func TestHandleHealthCheck(t *testing.T) {
t.Parallel()
lc := fxtest.NewLifecycle(t)
log, err := logger.New(lc, logger.Params{Globals: &globals.Globals{}})
if err != nil {
t.Fatalf("logger.New() error = %v", err)
}
hc, err := healthcheck.New(lc, healthcheck.Params{
Globals: &globals.Globals{Appname: "pixad", Version: "v1.2.3"},
Config: &config.Config{MaintenanceMode: true},
Logger: log,
})
if err != nil {
t.Fatalf("healthcheck.New() error = %v", err)
}
h := &Handlers{hc: hc, log: slog.New(slog.DiscardHandler)}
rec := sendGet(t, h.HandleHealthCheck(), "/.well-known/healthcheck.json")
if rec.Code != http.StatusOK {
t.Errorf("status = %d, want %d", rec.Code, http.StatusOK)
}
if ct := rec.Header().Get("Content-Type"); ct != "application/json" {
t.Errorf("Content-Type = %q, want application/json", ct)
}
var body map[string]any
err = json.NewDecoder(rec.Body).Decode(&body)
if err != nil {
t.Fatalf("decoding response body: %v", err)
}
if body["status"] != "ok" || body["appname"] != "pixad" ||
body["version"] != "v1.2.3" || body["maintenance_mode"] != true {
t.Errorf("body = %v, want status ok, appname pixad, version v1.2.3 "+
"and maintenance_mode true", body)
}
for _, key := range []string{"now", "uptime_seconds", "uptime_human"} {
if _, ok := body[key]; !ok {
t.Errorf("body = %v, has no %s", body, key)
}
}
}
internal/handlers/server_busy_internal_test.go
+49
View File
@@ -0,0 +1,49 @@
package handlers
import (
"fmt"
"log/slog"
"net/http"
"net/http/httptest"
"strings"
"testing"
"sneak.berlin/go/pixa/internal/httpfetcher"
"sneak.berlin/go/pixa/internal/imageprocessor"
"sneak.berlin/go/pixa/internal/imgcache"
)
// TestServerBusyAnswers503 checks that both image routes answer 503 with
// a clear error when the image service gives up waiting for a free upstream
// connection or processing slot, wrapped as the service wraps them.
func TestServerBusyAnswers503(t *testing.T) {
t.Parallel()
h := &Handlers{log: slog.New(slog.DiscardHandler)}
req := &imgcache.ImageRequest{SourceHost: "img.example.com", SourcePath: "/a.jpg"}
for _, err := range []error{
fmt.Errorf("upstream fetch failed: %w", httpfetcher.ErrTooManyConnections),
fmt.Errorf("image processing failed: %w", imageprocessor.ErrTooManyImages),
} {
plain := httptest.NewRecorder()
h.respondImageError(plain, req, err)
encrypted := httptest.NewRecorder()
h.handleImageError(encrypted, err)
for route, rec := range map[string]*httptest.ResponseRecorder{
"/v1/image/": plain, "/v1/e/": encrypted,
} {
if rec.Code != http.StatusServiceUnavailable {
t.Errorf("%s for %v: status = %d, want %d",
route, err, rec.Code, http.StatusServiceUnavailable)
}
if !strings.Contains(rec.Body.String(), "server busy, try again later") {
t.Errorf("%s for %v: body = %q, want the server busy error",
route, err, rec.Body.String())
}
}
}
}
internal/httpfetcher/dial_context_internal_test.go
+66
View File
@@ -0,0 +1,66 @@
package httpfetcher
import (
"errors"
"net"
"testing"
)
// TestNewUsesCheckedDialerWithoutDialContext checks that a fetcher built
// without DialContext, as pixa builds it, refuses to connect to a local
// server.
func TestNewUsesCheckedDialerWithoutDialContext(t *testing.T) {
t.Parallel()
srv := startUpstream(t)
transport := transportOf(t, New(DefaultConfig()))
addr := srv.Listener.Addr().String()
_, err := transport.DialContext(testContext(t), "tcp", addr)
if !errors.Is(err, ErrSSRFBlocked) {
t.Fatalf("DialContext(%s) error = %v, want ErrSSRFBlocked", addr, err)
}
}
// TestDialContextReplacesOnlyTheDialer checks that a fetcher built with
// DialContext connects through it, while the URL check still refuses a
// loopback URL and the redirect check a redirect to a link-local address.
func TestDialContextReplacesOnlyTheDialer(t *testing.T) {
t.Parallel()
srv := startUpstream(t)
dialer := &recordingDialer{target: srv.Listener.Addr().String()}
cfg := DefaultConfig()
cfg.AllowHTTP = true
cfg.DialContext = dialer.dialContext
f := New(cfg)
if body := fetchBody(t, f, "/image"); body != imagePayload {
t.Errorf("body = %q, want %q", body, imagePayload)
}
_, err := f.Fetch(testContext(t), "http://127.0.0.1/image")
if !errors.Is(err, ErrSSRFBlocked) {
t.Errorf("Fetch(loopback URL) error = %v, want ErrSSRFBlocked", err)
}
_, err = f.Fetch(testContext(t), upstreamURL("/redirect/private"))
if !errors.Is(err, ErrSSRFBlocked) {
t.Errorf("Fetch(/redirect/private) error = %v, want ErrSSRFBlocked", err)
}
// The upstream server is reached through DialContext, and nothing else
// is asked of it.
dialed := dialer.dialedAddrs()
if len(dialed) == 0 {
t.Error("DialContext was never called")
}
for _, addr := range dialed {
if addr != net.JoinHostPort(testPublicHost, "80") {
t.Errorf("DialContext was asked to connect to %s", addr)
}
}
}
internal/httpfetcher/fetch_internal_test.go
+17 -1
View File
@@ -191,7 +191,23 @@ func fetchBody(t *testing.T, f *HTTPFetcher, path string) string {
// semLen reports how many per-host semaphore slots are currently held.
func semLen(f *HTTPFetcher, host string) int {
return len(f.getHostSemaphore(host))
f.hostSemMu.Lock()
defer f.hostSemMu.Unlock()
sem, ok := f.hostSems[host]
if !ok {
return 0
}
return len(sem.slots)
}
// hostSemCount reports how many hosts have a semaphore in hostSems.
func hostSemCount(f *HTTPFetcher) int {
f.hostSemMu.Lock()
defer f.hostSemMu.Unlock()
return len(f.hostSems)
}
func TestFetchRedirectToPrivateIPBlocked(t *testing.T) {
internal/httpfetcher/httpfetcher.go
+147 -40
View File
@@ -1,5 +1,6 @@
// Package httpfetcher fetches content from upstream HTTP origins with SSRF
// protection, per-host connection limits, and content-type validation.
// protection, connection limits per host and for all hosts together, and
// content-type validation.
package httpfetcher
import (
@@ -17,6 +18,8 @@ import (
"strings"
"sync"
"time"
"github.com/go-chi/chi/v5/middleware"
)
// Fetcher configuration constants.
@@ -28,8 +31,13 @@ const (
DefaultIdleConnTimeout = 90 * time.Second
DefaultMaxRedirects = 10
DefaultMaxConnectionsPerHost = 20
DefaultMaxConnections = 64
)
// ConnectionWaitTimeout is how long Fetch waits for a free connection when
// MaxConnections fetches are already in progress.
const ConnectionWaitTimeout = 10 * time.Second
// MIME content types.
const (
contentTypeJPEG = "image/jpeg"
@@ -70,6 +78,7 @@ var (
ErrInvalidContentType = errors.New("invalid or unsupported content type")
ErrUpstreamError = errors.New("upstream server error")
ErrUpstreamTimeout = errors.New("upstream request timeout")
ErrTooManyConnections = errors.New("too many concurrent upstream connections")
)
// Internal fetcher errors.
@@ -122,9 +131,17 @@ type Config struct {
AllowHTTP bool
// MaxConnectionsPerHost limits concurrent connections to each upstream host.
MaxConnectionsPerHost int
// MaxConnections limits concurrent connections to all upstream hosts
// together.
MaxConnections int
// BlockedNetworks are operator-supplied CIDR ranges refused by the
// dialer, in addition to the always-enforced built-in ranges.
BlockedNetworks []netip.Prefix
// DialContext, when set, makes the fetcher's connections in place of
// the dialer that refuses internal addresses; the URL and redirect
// checks still run. Only tests set it, to reach a local server; the
// config file and the environment cannot.
DialContext func(ctx context.Context, network, addr string) (net.Conn, error)
}
// DefaultConfig returns a Config with sensible defaults.
@@ -143,15 +160,33 @@ func DefaultConfig() *Config {
},
AllowHTTP: false,
MaxConnectionsPerHost: DefaultMaxConnectionsPerHost,
MaxConnections: DefaultMaxConnections,
}
}
// HTTPFetcher implements Fetcher with SSRF protection and per-host connection limits.
// HTTPFetcher implements Fetcher with SSRF protection and connection limits
// per host and for all hosts together.
type HTTPFetcher struct {
client *http.Client
config *Config
hostSems map[string]chan struct{} // per-host semaphores
hostSemMu sync.Mutex // protects hostSems map
client *http.Client
config *Config
// hostSems holds the semaphore of each host with a fetch holding or
// waiting for one of its slots; the entry is removed when the host's
// last such fetch gives its slot back or stops waiting.
hostSems map[string]*hostSemaphore
hostSemMu sync.Mutex // protects hostSems and each entry's count
// allHostsSemaphore has one slot per connection allowed to all hosts
// together (config.MaxConnections).
allHostsSemaphore chan struct{}
// connectionWaitTimeout is ConnectionWaitTimeout; tests shorten it.
connectionWaitTimeout time.Duration
}
// hostSemaphore is one host's connection slots
// (config.MaxConnectionsPerHost) and the number of fetches holding or
// waiting for one of them.
type hostSemaphore struct {
slots chan struct{}
count int
}
// New creates a new HTTPFetcher with SSRF protection.
@@ -160,13 +195,19 @@ func New(config *Config) *HTTPFetcher {
config = DefaultConfig()
}
// Create transport with SSRF-safe dialer. The dialer re-resolves and
// re-checks at connect time (closing the DNS-rebinding window) against
// both the built-in ranges and the operator-supplied blocklist.
transport := &http.Transport{
DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
// Unless config.DialContext replaces it, the transport connects with
// the SSRF-safe dialer, which re-resolves and re-checks at connect time
// (closing the DNS-rebinding window) against both the built-in ranges
// and the operator-supplied blocklist.
dialContext := config.DialContext
if dialContext == nil {
dialContext = func(ctx context.Context, network, addr string) (net.Conn, error) {
return dialSSRFSafe(ctx, network, addr, config.BlockedNetworks)
},
}
}
transport := &http.Transport{
DialContext: dialContext,
TLSHandshakeTimeout: DefaultTLSTimeout,
MaxIdleConns: DefaultMaxIdleConns,
IdleConnTimeout: DefaultIdleConnTimeout,
@@ -192,13 +233,18 @@ func New(config *Config) *HTTPFetcher {
}
return &HTTPFetcher{
client: client,
config: config,
hostSems: make(map[string]chan struct{}),
client: client,
config: config,
hostSems: make(map[string]*hostSemaphore),
allHostsSemaphore: make(chan struct{}, config.MaxConnections),
connectionWaitTimeout: ConnectionWaitTimeout,
}
}
// Fetch retrieves content from the given URL with SSRF protection.
// Fetch retrieves content from the given URL with SSRF protection. When
// MaxConnections fetches are already in progress, it waits up to
// ConnectionWaitTimeout for one to finish, then fails with
// ErrTooManyConnections.
func (f *HTTPFetcher) Fetch(ctx context.Context, url string) (*FetchResult, error) {
// Validate URL before making request
err := validateURL(ctx, url, f.config.AllowHTTP)
@@ -206,24 +252,17 @@ func (f *HTTPFetcher) Fetch(ctx context.Context, url string) (*FetchResult, erro
return nil, err
}
// Extract host for rate limiting
host := extractHost(url)
// Acquire semaphore slot for this host
sem := f.getHostSemaphore(host)
select {
case sem <- struct{}{}:
// Acquired slot
case <-ctx.Done():
return nil, ctx.Err()
release, err := f.acquireConnection(ctx, extractHost(url))
if err != nil {
return nil, err
}
// If we fail before returning a result, release the slot
// If we fail before returning a result, release the connection
success := false
defer func() {
if !success {
<-sem
release()
}
}()
@@ -241,6 +280,13 @@ func (f *HTTPFetcher) Fetch(ctx context.Context, url string) (*FetchResult, erro
req.Header.Set("User-Agent", f.config.UserAgent)
req.Header.Set("Accept", strings.Join(f.config.AllowedContentTypes, ", "))
// The ID of the request this fetch serves, so the fetch can be found in
// the upstream host's logs
requestID := middleware.GetReqID(ctx)
if requestID != "" {
req.Header.Set(middleware.RequestIDHeader, requestID)
}
// Use httptrace to capture connection details
var remoteAddr string
@@ -267,38 +313,98 @@ func (f *HTTPFetcher) Fetch(ctx context.Context, url string) (*FetchResult, erro
return nil, fmt.Errorf("upstream request failed: %w", err)
}
result, err := f.buildResult(resp, remoteAddr, fetchDuration, sem)
result, err := f.buildResult(resp, remoteAddr, fetchDuration, release)
if err != nil {
return nil, err
}
// Mark success so defer doesn't release the semaphore
// Mark success so defer doesn't release the connection; closing the
// result's Content does
success = true
return result, nil
}
// getHostSemaphore returns the semaphore for a host, creating it if necessary.
// acquireConnection takes a slot for host, then one of the slots shared by
// all hosts, and returns the func that gives both back. The host's slot
// comes first, so fetches queued for one busy host hold no shared slot.
// Only the wait for a shared slot is bounded: after connectionWaitTimeout
// it fails with ErrTooManyConnections.
func (f *HTTPFetcher) acquireConnection(
ctx context.Context, host string,
) (func(), error) {
hostSem := f.getHostSemaphore(host)
select {
case hostSem <- struct{}{}:
case <-ctx.Done():
f.putHostSemaphore(host)
return nil, ctx.Err()
}
select {
case f.allHostsSemaphore <- struct{}{}:
case <-time.After(f.connectionWaitTimeout):
<-hostSem
f.putHostSemaphore(host)
return nil, ErrTooManyConnections
case <-ctx.Done():
<-hostSem
f.putHostSemaphore(host)
return nil, ctx.Err()
}
return func() {
<-hostSem
f.putHostSemaphore(host)
<-f.allHostsSemaphore
}, nil
}
// getHostSemaphore returns the semaphore for a host, creating it if
// necessary, and counts the caller among the fetches using it. The caller
// calls putHostSemaphore once it holds no slot and waits for none.
func (f *HTTPFetcher) getHostSemaphore(host string) chan struct{} {
f.hostSemMu.Lock()
defer f.hostSemMu.Unlock()
sem, ok := f.hostSems[host]
if !ok {
sem = make(chan struct{}, f.config.MaxConnectionsPerHost)
sem = &hostSemaphore{
slots: make(chan struct{}, f.config.MaxConnectionsPerHost),
}
f.hostSems[host] = sem
}
return sem
sem.count++
return sem.slots
}
// putHostSemaphore stops counting the caller among the fetches using the
// host's semaphore, and removes the semaphore when no fetch uses it.
func (f *HTTPFetcher) putHostSemaphore(host string) {
f.hostSemMu.Lock()
defer f.hostSemMu.Unlock()
sem := f.hostSems[host]
sem.count--
if sem.count == 0 {
delete(f.hostSems, host)
}
}
// buildResult validates the upstream response and assembles a FetchResult
// whose Content releases the host semaphore slot when closed.
// whose Content calls release when closed.
func (f *HTTPFetcher) buildResult(
resp *http.Response,
remoteAddr string,
fetchDuration time.Duration,
sem chan struct{},
release func(),
) (*FetchResult, error) {
// Extract HTTP version (strip "HTTP/" prefix)
httpVersion := strings.TrimPrefix(resp.Proto, "HTTP/")
@@ -333,7 +439,7 @@ func (f *HTTPFetcher) buildResult(
}
return &FetchResult{
Content: &semaphoreReleasingReadCloser{limitedBody, resp.Body, sem},
Content: &semaphoreReleasingReadCloser{limitedBody, resp.Body, release},
ContentLength: resp.ContentLength,
ContentType: contentType,
Headers: resp.Header,
@@ -574,17 +680,18 @@ func (r *limitedReader) Read(p []byte) (int, error) {
return n, err
}
// semaphoreReleasingReadCloser releases a semaphore slot when closed.
// semaphoreReleasingReadCloser releases the fetch's connection slots when
// closed.
type semaphoreReleasingReadCloser struct {
*limitedReader
closer io.Closer
sem chan struct{}
closer io.Closer
release func()
}
func (r *semaphoreReleasingReadCloser) Close() error {
err := r.closer.Close()
<-r.sem // Release semaphore slot
r.release()
return err
}
internal/httpfetcher/max_connections_internal_test.go
+258
View File
@@ -0,0 +1,258 @@
package httpfetcher
import (
"context"
"errors"
"net"
"strconv"
"sync"
"testing"
"time"
)
// imageURLOnPort is the fake upstream's image route on testPublicHost at
// port. Each port is a different host to the per-host limit, while the test
// dialer sends every port to the one test server.
func imageURLOnPort(port int) string {
return "http://" + net.JoinHostPort(testPublicHost, strconv.Itoa(port)) +
"/image"
}
func TestDefaultConfigMaxConnections(t *testing.T) {
t.Parallel()
if got := DefaultConfig().MaxConnections; got != DefaultMaxConnections {
t.Errorf("MaxConnections = %d, want %d", got, DefaultMaxConnections)
}
}
// TestFetchLimitsConnectionsToAllHostsTogether checks that MaxConnections
// counts the fetches to every host together, apart from the per-host
// limit: with MaxConnections at 2 and two responses open from two hosts, a
// fetch from a third host, which has nothing open, waits the whole wait
// timeout and fails with ErrTooManyConnections. Closing one response lets
// it through.
func TestFetchLimitsConnectionsToAllHostsTogether(t *testing.T) {
t.Parallel()
srv := startUpstream(t)
cfg := DefaultConfig()
cfg.MaxConnections = 2
f, _ := newServerFetcher(t, srv, cfg)
f.connectionWaitTimeout = 100 * time.Millisecond
first, err := f.Fetch(testContext(t), imageURLOnPort(81))
if err != nil {
t.Fatalf("first Fetch() error = %v", err)
}
second, err := f.Fetch(testContext(t), imageURLOnPort(82))
if err != nil {
t.Fatalf("second Fetch() error = %v", err)
}
defer func() { _ = second.Content.Close() }()
start := time.Now()
_, err = f.Fetch(testContext(t), imageURLOnPort(83))
if !errors.Is(err, ErrTooManyConnections) {
t.Fatalf("third Fetch() error = %v, want ErrTooManyConnections", err)
}
if waited := time.Since(start); waited < f.connectionWaitTimeout {
t.Errorf("third Fetch() failed after %v, before waiting %v",
waited, f.connectionWaitTimeout)
}
if held := semLen(f, testPublicHost+":83"); held != 0 {
t.Errorf("the refused fetch kept its host's slot: %d held", held)
}
err = first.Content.Close()
if err != nil {
t.Fatalf("close first body: %v", err)
}
third, err := f.Fetch(testContext(t), imageURLOnPort(83))
if err != nil {
t.Fatalf("Fetch() after a response was closed: error = %v", err)
}
_ = third.Content.Close()
}
// TestFetchFreesHostSlotWhenContextEndsWaitingForConnection checks that a
// fetch whose request context ends while it waits for a connection shared
// by all hosts gives its host's slot back. With MaxConnections at 1 and one
// response open, a fetch from another host takes that host's slot and waits;
// its context ends long before the 10 second wait timeout.
func TestFetchFreesHostSlotWhenContextEndsWaitingForConnection(t *testing.T) {
t.Parallel()
srv := startUpstream(t)
cfg := DefaultConfig()
cfg.MaxConnections = 1
f, _ := newServerFetcher(t, srv, cfg)
first, err := f.Fetch(testContext(t), imageURLOnPort(81))
if err != nil {
t.Fatalf("first Fetch() error = %v", err)
}
defer func() { _ = first.Content.Close() }()
ctx, cancel := context.WithTimeout(t.Context(), 100*time.Millisecond)
defer cancel()
_, err = f.Fetch(ctx, imageURLOnPort(82))
if !errors.Is(err, context.DeadlineExceeded) {
t.Fatalf("second Fetch() error = %v, want context.DeadlineExceeded", err)
}
if held := semLen(f, testPublicHost+":82"); held != 0 {
t.Errorf("the fetch kept its host's slot after its context ended: "+
"%d held", held)
}
}
// TestFetchRemovesIdleHostSemaphores checks that a host's semaphore is
// removed once no fetch holds or waits for one of its slots: after 100
// concurrent fetches from 50 hosts have all finished, no semaphore is left.
func TestFetchRemovesIdleHostSemaphores(t *testing.T) {
t.Parallel()
srv := startUpstream(t)
f, _ := newServerFetcher(t, srv, nil)
ctx := testContext(t)
var wg sync.WaitGroup
for i := range 100 {
wg.Go(func() {
res, err := f.Fetch(ctx, imageURLOnPort(1+i%50))
if err != nil {
t.Errorf("Fetch() error = %v", err)
return
}
_ = res.Content.Close()
})
}
wg.Wait()
if n := hostSemCount(f); n != 0 {
t.Errorf("%d host semaphores left after every fetch finished, want 0", n)
}
}
// TestFetchRemovesHostSemaphoreWhenNoConnection checks that a fetch that
// ends without a connection leaves no semaphore behind: when it is refused
// after waiting for a connection shared by all hosts, when its context ends
// while it waits for its host's slot, and when its context ends while it
// waits for a connection shared by all hosts, long before the 10 second
// wait timeout.
func TestFetchRemovesHostSemaphoreWhenNoConnection(t *testing.T) {
t.Parallel()
srv := startUpstream(t)
cfg := DefaultConfig()
cfg.MaxConnections = 1
cfg.MaxConnectionsPerHost = 1
f, _ := newServerFetcher(t, srv, cfg)
f.connectionWaitTimeout = 100 * time.Millisecond
open, err := f.Fetch(testContext(t), imageURLOnPort(81))
if err != nil {
t.Fatalf("first Fetch() error = %v", err)
}
_, err = f.Fetch(testContext(t), imageURLOnPort(82))
if !errors.Is(err, ErrTooManyConnections) {
t.Fatalf("Fetch() from another host: error = %v, "+
"want ErrTooManyConnections", err)
}
ctx, cancel := context.WithTimeout(t.Context(), 100*time.Millisecond)
defer cancel()
_, err = f.Fetch(ctx, imageURLOnPort(81))
if !errors.Is(err, context.DeadlineExceeded) {
t.Fatalf("Fetch() from the busy host: error = %v, "+
"want context.DeadlineExceeded", err)
}
// Back to the 10 second wait, so the next fetch's context ends first.
f.connectionWaitTimeout = ConnectionWaitTimeout
ctx, cancel = context.WithTimeout(t.Context(), 100*time.Millisecond)
defer cancel()
_, err = f.Fetch(ctx, imageURLOnPort(83))
if !errors.Is(err, context.DeadlineExceeded) {
t.Fatalf("Fetch() from a host with nothing open: error = %v, "+
"want context.DeadlineExceeded", err)
}
err = open.Content.Close()
if err != nil {
t.Fatalf("close first body: %v", err)
}
if n := hostSemCount(f); n != 0 {
t.Errorf("%d host semaphores left after every fetch finished, want 0", n)
}
}
// TestFetchReleasesConnectionOnError checks that a fetch that fails after
// taking its connection gives it back: with MaxConnections at 1, the slot
// must be free after the failure and the next fetch must succeed.
func TestFetchReleasesConnectionOnError(t *testing.T) {
t.Parallel()
cases := []struct {
name string
url string
want error
}{
{"upstream answers 500", upstreamURL("/status/500"), ErrUpstreamError},
{"upstream sends HTML", upstreamURL("/html"), ErrInvalidContentType},
// 198.51.100.7 (TEST-NET-2) passes the SSRF checks, and the test
// dialer refuses every host but testPublicHost.
{"connecting fails", "http://198.51.100.7/image", errUnexpectedDial},
}
for _, tc := range cases {
t.Run(tc.name, func(t *testing.T) {
t.Parallel()
srv := startUpstream(t)
cfg := DefaultConfig()
cfg.MaxConnections = 1
f, _ := newServerFetcher(t, srv, cfg)
f.connectionWaitTimeout = 100 * time.Millisecond
_, err := f.Fetch(testContext(t), tc.url)
if !errors.Is(err, tc.want) {
t.Fatalf("Fetch() error = %v, want %v", err, tc.want)
}
if held := len(f.allHostsSemaphore); held != 0 {
t.Fatalf("connection still held after the error: %d held", held)
}
res := fetchImage(t, f, "/image")
_ = res.Content.Close()
})
}
}
internal/httpfetcher/request_id_internal_test.go
+50
View File
@@ -0,0 +1,50 @@
package httpfetcher
import (
"context"
"io"
"net/http"
"net/http/httptest"
"testing"
"github.com/go-chi/chi/v5/middleware"
)
// TestFetchSendsRequestID verifies that a fetch sends the ID of the request
// it serves, which the RequestID middleware stores in the request context,
// to the upstream host as X-Request-Id, so the fetch can be found in that
// host's logs.
func TestFetchSendsRequestID(t *testing.T) {
t.Parallel()
const requestID = "test-request-id"
received := make(chan string, 1)
srv := httptest.NewServer(http.HandlerFunc(
func(w http.ResponseWriter, r *http.Request) {
received <- r.Header.Get("X-Request-Id")
w.Header().Set("Content-Type", contentTypeJPEG)
_, _ = io.WriteString(w, imagePayload)
}))
t.Cleanup(srv.Close)
f, _ := newServerFetcher(t, srv, nil)
ctx := context.WithValue(testContext(t), middleware.RequestIDKey, requestID)
res, err := f.Fetch(ctx, upstreamURL("/image"))
if err != nil {
t.Fatalf("Fetch() error = %v", err)
}
_ = res.Content.Close()
got := <-received
t.Logf("upstream received X-Request-Id %q", got)
if got != requestID {
t.Errorf("upstream X-Request-Id = %q, want %q", got, requestID)
}
}
internal/imageprocessor/imageprocessor.go
+99 -5
View File
@@ -7,7 +7,9 @@ import (
"errors"
"fmt"
"io"
"runtime"
"sync"
"time"
"github.com/davidbyttow/govips/v2/vips"
)
@@ -17,11 +19,21 @@ import (
//nolint:gochecknoglobals // package-level sync.Once for one-time vips init
var vipsOnce sync.Once
// initVips initializes libvips with quiet logging.
// initVips initializes libvips with quiet logging, one worker thread per
// image and no operation cache. Process already works on one image per CPU
// by default, so more threads per image would only compete for the CPUs.
// Each request decodes different source bytes, so the operation cache
// would rarely be hit and would hold memory outside MaxConcurrentProcessing;
// repeated requests are served from pixa's disk cache instead.
func initVips() {
vipsOnce.Do(func() {
vips.LoggingSettings(nil, vips.LogLevelError)
vips.Startup(nil)
vips.Startup(&vips.Config{
ConcurrencyLevel: 1,
MaxCacheSize: 0,
MaxCacheMem: 0,
MaxCacheFiles: 0,
})
})
}
@@ -106,9 +118,23 @@ var ErrInputDataTooLarge = errors.New("input data exceeds maximum allowed size")
// not supported.
var ErrUnsupportedOutputFormat = errors.New("unsupported output format")
// ErrTooManyImages is returned when MaxConcurrentProcessing images are being
// processed and none finishes within ProcessingWaitTimeout.
var ErrTooManyImages = errors.New("too many images being processed at once")
// ProcessingWaitTimeout is how long Process waits for a free slot when
// MaxConcurrentProcessing images are already being processed.
const ProcessingWaitTimeout = 10 * time.Second
// ImageProcessor implements image transformation using libvips via govips.
type ImageProcessor struct {
maxInputBytes int64
// processingSemaphore has one slot per image that may be processed at
// once. Process holds a slot from before it reads its input until it
// returns, so the input, the decoded image and the output all count.
processingSemaphore chan struct{}
// processingWaitTimeout is ProcessingWaitTimeout; tests shorten it.
processingWaitTimeout time.Duration
}
// Params holds configuration for creating an ImageProcessor.
@@ -117,6 +143,9 @@ type Params struct {
// MaxInputBytes is the maximum allowed input size in bytes.
// If <= 0, DefaultMaxInputBytes is used.
MaxInputBytes int64
// MaxConcurrentProcessing is the most images processed at once.
// If <= 0, the number of CPUs Go uses (runtime.GOMAXPROCS(0)) is used.
MaxConcurrentProcessing int
}
// New creates a new image processor with the given parameters.
@@ -129,17 +158,34 @@ func New(params Params) *ImageProcessor {
maxInputBytes = DefaultMaxInputBytes
}
maxConcurrentProcessing := params.MaxConcurrentProcessing
if maxConcurrentProcessing <= 0 {
maxConcurrentProcessing = runtime.GOMAXPROCS(0)
}
return &ImageProcessor{
maxInputBytes: maxInputBytes,
maxInputBytes: maxInputBytes,
processingSemaphore: make(chan struct{}, maxConcurrentProcessing),
processingWaitTimeout: ProcessingWaitTimeout,
}
}
// Process transforms an image according to the request.
// Process transforms an image according to the request. When
// MaxConcurrentProcessing images are already being processed, it waits up
// to ProcessingWaitTimeout for one to finish, then fails with
// ErrTooManyImages.
func (p *ImageProcessor) Process(
_ context.Context,
ctx context.Context,
input io.Reader,
req *Request,
) (*Result, error) {
release, err := p.acquireSlot(ctx)
if err != nil {
return nil, err
}
defer release()
// Read input with a size limit to prevent unbounded memory consumption.
// We read at most maxInputBytes+1 so we can detect if the input exceeds
// the limit without consuming additional memory.
@@ -285,6 +331,54 @@ func FormatToMIME(format Format) string {
}
}
// WaitForProcessing waits until no image is being processed, or until ctx
// ends, and returns how many images were still being processed then. It
// waits by taking each slot in processingSemaphore as it frees up until it
// holds them all, or until ctx ends, then gives back the slots it took.
func (p *ImageProcessor) WaitForProcessing(ctx context.Context) int {
taken := 0
defer func() {
for range taken {
<-p.processingSemaphore
}
}()
for taken < cap(p.processingSemaphore) {
select {
case p.processingSemaphore <- struct{}{}:
taken++
case <-ctx.Done():
return len(p.processingSemaphore) - taken
}
}
return 0
}
// acquireSlot takes a slot in processingSemaphore, waiting at most
// processingWaitTimeout for one to free up, and returns the func that gives
// it back. A free slot is taken even when ctx has ended; only the wait for
// one stops when ctx ends, as the rest of Process does not check ctx.
func (p *ImageProcessor) acquireSlot(ctx context.Context) (func(), error) {
release := func() { <-p.processingSemaphore }
select {
case p.processingSemaphore <- struct{}{}:
return release, nil
default:
}
select {
case p.processingSemaphore <- struct{}{}:
return release, nil
case <-time.After(p.processingWaitTimeout):
return nil, ErrTooManyImages
case <-ctx.Done():
return nil, ctx.Err()
}
}
// detectFormat returns the format string from a vips image.
func (p *ImageProcessor) detectFormat(img *vips.ImageRef) string {
format := img.Format()
internal/imageprocessor/max_concurrent_processing_internal_test.go
+368
View File
@@ -0,0 +1,368 @@
package imageprocessor
import (
"bytes"
"context"
"errors"
"io"
"runtime"
"strings"
"sync"
"testing"
"testing/iotest"
"time"
)
// errTestReadFailed is the error the unreadable test input returns.
var errTestReadFailed = errors.New("test input cannot be read")
// readingCounter counts the Process calls reading their input at the same
// time and remembers the most there ever were.
type readingCounter struct {
mu sync.Mutex
reading int
most int
}
func (c *readingCounter) start() {
c.mu.Lock()
defer c.mu.Unlock()
c.reading++
c.most = max(c.most, c.reading)
}
func (c *readingCounter) stop() {
c.mu.Lock()
defer c.mu.Unlock()
c.reading--
}
func (c *readingCounter) mostReading() int {
c.mu.Lock()
defer c.mu.Unlock()
return c.most
}
// gatedReader is a Process input. Its first Read counts the call in,
// reports it on entered and blocks until gate is closed; it counts the call
// out when it returns io.EOF. Process reads its input only while it holds a
// processing slot, so the count never goes above MaxConcurrentProcessing.
type gatedReader struct {
data *bytes.Reader
gate <-chan struct{}
entered chan<- struct{}
counter *readingCounter
started bool
}
func (r *gatedReader) Read(p []byte) (int, error) {
if !r.started {
r.started = true
r.counter.start()
r.entered <- struct{}{}
<-r.gate
}
n, err := r.data.Read(p)
if errors.Is(err, io.EOF) {
r.counter.stop()
}
return n, err
}
// smallJPEGRequest asks for a 5x5 JPEG.
func smallJPEGRequest() *Request {
return &Request{
Size: Size{Width: 5, Height: 5},
Format: FormatJPEG,
Quality: 85,
FitMode: FitCover,
}
}
// processInBackground runs Process on reader in a new goroutine and sends
// its error on results.
func processInBackground(
proc *ImageProcessor, reader *gatedReader, results chan<- error,
) {
go func() {
result, err := proc.Process(context.Background(), reader, smallJPEGRequest())
if err == nil {
_ = result.Content.Close()
}
results <- err
}()
}
// waitForEntries fails the test unless count Process calls report on
// entered within a few seconds.
func waitForEntries(t *testing.T, entered <-chan struct{}, count int) {
t.Helper()
for range count {
select {
case <-entered:
case <-time.After(5 * time.Second):
t.Fatal("Process calls did not start reading their input")
}
}
}
func TestNewDefaultsMaxConcurrentProcessingToCPUs(t *testing.T) {
t.Parallel()
for _, limit := range []int{0, -1} {
proc := New(Params{MaxConcurrentProcessing: limit})
if got := cap(proc.processingSemaphore); got != runtime.GOMAXPROCS(0) {
t.Errorf("MaxConcurrentProcessing %d: %d slots, want %d, one per CPU",
limit, got, runtime.GOMAXPROCS(0))
}
}
proc := New(Params{MaxConcurrentProcessing: 3})
if got := cap(proc.processingSemaphore); got != 3 {
t.Errorf("MaxConcurrentProcessing 3: %d slots, want 3", got)
}
}
// TestProcessNeverExceedsMaxConcurrentProcessing starts more Process calls
// than MaxConcurrentProcessing allows and holds the first ones inside
// Process until the test lets them go. No more than the limit may be
// working at once, and the calls held back must wait for a slot and then
// succeed.
func TestProcessNeverExceedsMaxConcurrentProcessing(t *testing.T) {
t.Parallel()
const (
limit = 2
calls = 6
)
proc := New(Params{MaxConcurrentProcessing: limit})
input := createTestJPEG(t, 50, 50)
counter := &readingCounter{}
gate := make(chan struct{})
entered := make(chan struct{}, calls)
results := make(chan error, calls)
openGate := sync.OnceFunc(func() { close(gate) })
t.Cleanup(openGate)
for range calls {
processInBackground(proc, &gatedReader{
data: bytes.NewReader(input), gate: gate, entered: entered,
counter: counter,
}, results)
}
waitForEntries(t, entered, limit)
// A call beyond the limit would start reading its input now.
select {
case <-entered:
t.Fatalf("a Process call started while %d were already working", limit)
case <-time.After(100 * time.Millisecond):
}
openGate()
for range calls {
err := <-results
if err != nil {
t.Errorf("Process() error = %v, want nil once a slot is free", err)
}
}
if most := counter.mostReading(); most > limit {
t.Errorf("%d Process calls worked at once, want at most %d", most, limit)
}
}
// TestProcessWaitsThenFailsWhenNoSlotFrees holds the only slot and checks
// that another call waits the whole wait timeout, then fails with
// ErrTooManyImages instead of processing anyway.
func TestProcessWaitsThenFailsWhenNoSlotFrees(t *testing.T) {
t.Parallel()
proc := New(Params{MaxConcurrentProcessing: 1})
proc.processingWaitTimeout = 100 * time.Millisecond
input := createTestJPEG(t, 10, 10)
gate := make(chan struct{})
entered := make(chan struct{}, 1)
held := make(chan error, 1)
openGate := sync.OnceFunc(func() { close(gate) })
t.Cleanup(openGate)
processInBackground(proc, &gatedReader{
data: bytes.NewReader(input), gate: gate, entered: entered,
counter: &readingCounter{},
}, held)
waitForEntries(t, entered, 1)
start := time.Now()
_, err := proc.Process(context.Background(), bytes.NewReader(input),
smallJPEGRequest())
if !errors.Is(err, ErrTooManyImages) {
t.Fatalf("Process() error = %v, want ErrTooManyImages", err)
}
if waited := time.Since(start); waited < proc.processingWaitTimeout {
t.Errorf("Process() failed after %v, before waiting %v",
waited, proc.processingWaitTimeout)
}
openGate()
err = <-held
if err != nil {
t.Errorf("Process() holding the slot: error = %v, want nil", err)
}
}
// TestProcessReleasesSlotOnError checks that Process gives its slot back
// when it fails, whether it fails early or late: with one slot, the slot
// must be free after the failure and the next call must succeed.
func TestProcessReleasesSlotOnError(t *testing.T) {
t.Parallel()
valid := createTestJPEG(t, 10, 10)
unsupported := smallJPEGRequest()
unsupported.Format = "bmp"
cases := []struct {
name string
input io.Reader
req *Request
// want is the error Process must return; nil means any error.
want error
}{
{
name: "input cannot be read",
input: iotest.ErrReader(errTestReadFailed),
req: smallJPEGRequest(),
want: errTestReadFailed,
},
{
name: "input over the byte limit",
input: bytes.NewReader(createTestJPEG(t, 800, 600)),
req: smallJPEGRequest(),
want: ErrInputDataTooLarge,
},
{
name: "input not an image",
input: strings.NewReader("not an image"),
req: smallJPEGRequest(),
},
{
name: "output format not supported",
input: bytes.NewReader(valid),
req: unsupported,
want: ErrUnsupportedOutputFormat,
},
}
for _, tc := range cases {
t.Run(tc.name, func(t *testing.T) {
t.Parallel()
proc := New(Params{MaxInputBytes: 4096, MaxConcurrentProcessing: 1})
proc.processingWaitTimeout = 100 * time.Millisecond
_, err := proc.Process(context.Background(), tc.input, tc.req)
if err == nil || (tc.want != nil && !errors.Is(err, tc.want)) {
t.Fatalf("Process() error = %v, want %v", err, tc.want)
}
if held := len(proc.processingSemaphore); held != 0 {
t.Fatalf("slot still held after the error: %d held", held)
}
result, err := proc.Process(context.Background(), bytes.NewReader(valid),
smallJPEGRequest())
if err != nil {
t.Fatalf("Process() after the error = %v, want nil", err)
}
_ = result.Content.Close()
})
}
}
// TestWaitForProcessing holds a processing slot with a Process call that
// cannot finish reading its input. WaitForProcessing must report that image
// when its context ends first, wait for it otherwise, return 0 once it has
// finished, and give back the slots it took while waiting.
func TestWaitForProcessing(t *testing.T) {
t.Parallel()
proc := New(Params{MaxConcurrentProcessing: 2})
gate := make(chan struct{})
entered := make(chan struct{}, 1)
results := make(chan error, 1)
openGate := sync.OnceFunc(func() { close(gate) })
t.Cleanup(openGate)
processInBackground(proc, &gatedReader{
data: bytes.NewReader(createTestJPEG(t, 10, 10)), gate: gate,
entered: entered, counter: &readingCounter{},
}, results)
waitForEntries(t, entered, 1)
ctx, cancel := context.WithTimeout(t.Context(), 100*time.Millisecond)
defer cancel()
stillProcessing := proc.WaitForProcessing(ctx)
t.Logf("WaitForProcessing() after its context ended: %d", stillProcessing)
if stillProcessing != 1 {
t.Errorf("WaitForProcessing() after its context ended = %d, want 1",
stillProcessing)
}
waited := make(chan int, 1)
go func() { waited <- proc.WaitForProcessing(t.Context()) }()
select {
case got := <-waited:
t.Fatalf("WaitForProcessing() = %d while an image was being processed",
got)
case <-time.After(100 * time.Millisecond):
}
openGate()
err := <-results
if err != nil {
t.Errorf("Process() error = %v, want nil", err)
}
select {
case got := <-waited:
if got != 0 {
t.Errorf("WaitForProcessing() once processing finished = %d, want 0",
got)
}
case <-time.After(5 * time.Second):
t.Fatal("WaitForProcessing() did not return once processing finished")
}
if held := len(proc.processingSemaphore); held != 0 {
t.Errorf("%d slots still held after WaitForProcessing() returned", held)
}
}
internal/imgcache/cache.go
+150 -49
View File
@@ -11,9 +11,9 @@ import (
"io"
"log/slog"
"path/filepath"
"sync"
"time"
lru "github.com/hashicorp/golang-lru/v2"
"sneak.berlin/go/pixa/internal/httpfetcher"
)
@@ -26,6 +26,10 @@ var (
// HTTP status code for successful fetch.
const httpStatusOK = 200
// metaCacheSize is how many variants' content types metaCache holds. A
// variant not among them is served as before, reading its .meta file.
const metaCacheSize = 10000
// CacheConfig holds cache configuration.
type CacheConfig struct {
StateDir string
@@ -33,11 +37,16 @@ type CacheConfig struct {
NegativeTTL time.Duration
// MaxBytes is the disk cache size limit in bytes that eviction
// enforces. Zero means no limit is enforced (no eviction). The
// config layer supplies the computed default when the operator
// omits cache_max_bytes.
// enforces. Zero means no limit is enforced (no eviction).
MaxBytes int64
// UseDefaultMaxBytes makes NewCache replace MaxBytes with the
// default limit: 75% of the sum of the space free on the filesystem
// holding the cache and the bytes the cache already holds, at least
// DefaultCacheMaxBytesFloor. The config layer sets this when the
// operator omits cache_max_bytes.
UseDefaultMaxBytes bool
// DisableDiskCache turns the disk cache off entirely: no cache
// directories are created, lookups always miss, stores are
// no-ops, and no eviction machinery runs. The config layer sets
@@ -49,12 +58,6 @@ type CacheConfig struct {
Logger *slog.Logger
}
// variantMeta stores content type for fast cache hits without reading .meta file.
type variantMeta struct {
ContentType string
Size int64
}
// Cache implements the caching layer for the image proxy.
type Cache struct {
db *sql.DB
@@ -70,15 +73,16 @@ type Cache struct {
// Eviction machinery. The channels are created in NewCache so
// stores can signal write pressure without racing StartEviction.
// evictionCancel, set by StartEviction, cancels the eviction
// goroutine's context.
evictionPressure chan struct{}
evictionStop chan struct{}
evictionDone chan struct{}
evictionStarted bool
evictionStopOnce sync.Once
evictionCancel context.CancelFunc
// In-memory cache of variant metadata (content type, size) to avoid
// reading .meta files
metaCache map[VariantKey]variantMeta
// metaCache holds the content types of the variants most recently
// stored or served, so a hit does not read the variant's .meta file.
// It never stands in for the variant file, which is always opened.
metaCache *lru.Cache[VariantKey, string]
// contentLocks serializes StoreSource and evictSourceBlob per
// content hash, closing the race window between an eviction's row
@@ -96,20 +100,32 @@ type Cache struct {
// NewCache creates a new cache instance.
func NewCache(db *sql.DB, config CacheConfig) (*Cache, error) {
return newCache(db, config, defaultFreeSpaceProbe)
}
// newCache is NewCache with the free-space probe passed in, so tests
// can fake the free space the default limit is worked out from.
func newCache(
db *sql.DB, config CacheConfig, probe FreeSpaceProbeFunc,
) (*Cache, error) {
log := config.Logger
if log == nil {
log = slog.Default()
}
metaCache, err := lru.New[VariantKey, string](metaCacheSize)
if err != nil {
return nil, fmt.Errorf("failed to create variant content type cache: %w", err)
}
c := &Cache{
db: db,
config: config,
log: log,
disabled: config.DisableDiskCache,
evictionPressure: make(chan struct{}, 1),
evictionStop: make(chan struct{}),
evictionDone: make(chan struct{}),
metaCache: make(map[VariantKey]variantMeta),
metaCache: metaCache,
contentLocks: newContentLock(),
}
@@ -142,6 +158,20 @@ func NewCache(db *sql.DB, config CacheConfig) (*Cache, error) {
c.variants = variants
c.srcMetadata = srcMetadata
if config.UseDefaultMaxBytes {
limit, err := c.computeDefaultMaxBytes(context.Background(), probe)
if err != nil {
return nil, err
}
c.config.MaxBytes = limit
log.Info("computed default cache size limit from free space and cache contents",
"cache_max_bytes", limit,
"cache_dir", filepath.Join(config.StateDir, "cache"),
)
}
return c, nil
}
@@ -177,13 +207,30 @@ func (c *Cache) Lookup(ctx context.Context, req *ImageRequest) (*LookupResult, e
}, nil
}
// GetVariant returns a reader, size, and content type for a cached variant.
// GetVariant returns a reader, size, and content type for a cached
// variant. The content type comes from metaCache, or else from the
// variant's .meta file and is then kept in metaCache. A variant with
// no .meta file is served as application/octet-stream, which is not
// kept.
func (c *Cache) GetVariant(cacheKey VariantKey) (io.ReadCloser, int64, string, error) {
if c.disabled {
return nil, 0, "", ErrNotFound
}
return c.variants.LoadWithMeta(cacheKey)
contentType, known := c.metaCache.Get(cacheKey)
if !known {
return c.loadVariantWithMeta(cacheKey)
}
reader, size, err := c.variants.LoadWithSize(cacheKey)
if err != nil {
// The file is gone, e.g. deleted outside pixa
c.metaCache.Remove(cacheKey)
return nil, 0, "", err
}
return reader, size, contentType, nil
}
// StoreSource stores fetched source content and metadata. On a
@@ -286,6 +333,8 @@ func (c *Cache) StoreVariant(
return err
}
c.metaCache.Add(cacheKey, contentType)
_, err = c.db.ExecContext(ctx, `
INSERT INTO variant_content (cache_key, size_bytes, content_type)
VALUES (?, ?, ?)
@@ -383,13 +432,16 @@ func (c *Cache) GetSourceMetadataID(
return id, nil
}
// GetSourceContent returns a reader for cached source content by its hash.
func (c *Cache) GetSourceContent(contentHash ContentHash) (io.ReadCloser, error) {
// GetSourceContent returns a reader for cached source content by its hash,
// and the content's size in bytes.
func (c *Cache) GetSourceContent(
contentHash ContentHash,
) (io.ReadCloser, int64, error) {
if c.disabled {
return nil, ErrNotFound
return nil, 0, ErrNotFound
}
return c.srcContent.Load(contentHash)
return c.srcContent.LoadWithSize(contentHash)
}
// CleanExpired removes expired entries from the cache.
@@ -419,19 +471,21 @@ func (c *Cache) Stats(ctx context.Context) (*CacheStats, error) {
return nil, fmt.Errorf("failed to get cache stats: %w", err)
}
// Get actual item count and total size from content tables
err = c.db.QueryRowContext(ctx,
`SELECT COUNT(*) FROM request_cache`,
).Scan(&stats.TotalItems)
if err != nil {
c.log.Warn("failed to count cache items for stats", "error", err)
}
// Count and size the cached source images and processed variants. A
// disabled cache holds none, whatever rows an earlier run left.
if !c.disabled {
err = c.db.QueryRowContext(ctx, `
SELECT (SELECT COUNT(*) FROM source_content)
+ (SELECT COUNT(*) FROM variant_content)
`).Scan(&stats.TotalItems)
if err != nil {
c.log.Warn("failed to count cache items for stats", "error", err)
}
err = c.db.QueryRowContext(ctx,
`SELECT COALESCE(SUM(size_bytes), 0) FROM output_content`,
).Scan(&stats.TotalSizeBytes)
if err != nil {
c.log.Warn("failed to sum cache size for stats", "error", err)
stats.TotalSizeBytes, err = c.UsageBytes(ctx)
if err != nil {
c.log.Warn("failed to sum cache size for stats", "error", err)
}
}
// Compute hit rate as a ratio
@@ -442,7 +496,8 @@ func (c *Cache) Stats(ctx context.Context) (*CacheStats, error) {
return &stats, nil
}
// IncrementStats increments cache statistics.
// IncrementStats counts a cache hit or miss, and an upstream fetch that read
// fetchBytes bytes, as IncrementUpstreamFetch does.
func (c *Cache) IncrementStats(ctx context.Context, hit bool, fetchBytes int64) {
var err error
@@ -466,19 +521,65 @@ func (c *Cache) IncrementStats(ctx context.Context, hit bool, fetchBytes int64)
c.log.Warn("failed to count cache hit or miss", "hit", hit, "error", err)
}
if fetchBytes > 0 {
_, err = c.db.ExecContext(ctx, `
UPDATE cache_stats
SET upstream_fetch_count = upstream_fetch_count + 1,
upstream_fetch_bytes = upstream_fetch_bytes + ?,
last_updated_at = CURRENT_TIMESTAMP
WHERE id = 1
`, fetchBytes)
if err != nil {
c.log.Warn("failed to count upstream fetch",
"fetch_bytes", fetchBytes, "error", err)
}
c.IncrementUpstreamFetch(ctx, fetchBytes)
}
// IncrementUpstreamFetch counts one upstream fetch that read fetchBytes bytes.
// A fetch that read no bytes is not counted.
func (c *Cache) IncrementUpstreamFetch(ctx context.Context, fetchBytes int64) {
if fetchBytes <= 0 {
return
}
_, err := c.db.ExecContext(ctx, `
UPDATE cache_stats
SET upstream_fetch_count = upstream_fetch_count + 1,
upstream_fetch_bytes = upstream_fetch_bytes + ?,
last_updated_at = CURRENT_TIMESTAMP
WHERE id = 1
`, fetchBytes)
if err != nil {
c.log.Warn("failed to count upstream fetch",
"fetch_bytes", fetchBytes, "error", err)
}
}
// IncrementTransformCount counts one image transcoded by the image processor.
func (c *Cache) IncrementTransformCount(ctx context.Context) {
_, err := c.db.ExecContext(ctx, `
UPDATE cache_stats
SET transform_count = transform_count + 1,
last_updated_at = CURRENT_TIMESTAMP
WHERE id = 1
`)
if err != nil {
c.log.Warn("failed to count transform", "error", err)
}
}
// loadVariantWithMeta is GetVariant for a variant metaCache does not
// hold: it reads the content type from the variant's .meta file and
// keeps it in metaCache, unless a StoreVariant has put one there
// meanwhile, as the store's is newer. A read that finds no .meta file,
// as one can between a store's writing of the variant file and of its
// .meta file, serves application/octet-stream and keeps nothing, so
// metaCache only ever holds a type read from a .meta file or passed to
// StoreVariant.
func (c *Cache) loadVariantWithMeta(
cacheKey VariantKey,
) (io.ReadCloser, int64, string, error) {
reader, size, contentType, err := c.variants.LoadWithMeta(cacheKey)
if err != nil {
return nil, 0, "", err
}
if contentType == "" {
return reader, size, fallbackContentType, nil
}
c.metaCache.ContainsOrAdd(cacheKey, contentType)
return reader, size, contentType, nil
}
// writeMetadataSidecar writes the JSON metadata sidecar of a stored source.
internal/imgcache/cachesize.go
+89
View File
@@ -0,0 +1,89 @@
package imgcache
import (
"context"
"errors"
"fmt"
"math"
"path/filepath"
"syscall"
)
// DefaultCacheMaxBytesFloor is the minimum computed default for the
// cache_max_bytes setting: 500 MiB. The floor applies only to the
// computed default (when the key is omitted from the configuration),
// never to explicitly configured values.
const DefaultCacheMaxBytesFloor int64 = 524288000
// freeSpaceFractionNumerator and freeSpaceFractionDenominator express
// the 75% share used for the computed default limit as integer
// arithmetic (dividing before multiplying avoids overflow).
const (
freeSpaceFractionNumerator uint64 = 3
freeSpaceFractionDenominator uint64 = 4
)
var errNegativeBlockSize = errors.New("statfs reported negative block size")
// FreeSpaceProbeFunc reports the number of free bytes available on the
// filesystem containing path. It is a function type so tests can
// inject a fake probe instead of depending on the host disk.
type FreeSpaceProbeFunc func(path string) (uint64, error)
// defaultFreeSpaceProbe reports free filesystem bytes via statfs on
// the given path, as available to unprivileged processes.
func defaultFreeSpaceProbe(path string) (uint64, error) {
var stat syscall.Statfs_t
err := syscall.Statfs(path, &stat)
if err != nil {
return 0, err
}
if stat.Bsize < 0 {
return 0, fmt.Errorf("%w %d for %q", errNegativeBlockSize, stat.Bsize, path)
}
blockSize := uint64(stat.Bsize)
return stat.Bavail * blockSize, nil
}
// computeDefaultMaxBytes returns the default cache size limit: 75% of
// the sum of the free bytes probe reports for <state_dir>/cache/ and
// the bytes the cache already holds, with a floor of
// DefaultCacheMaxBytesFloor. Counting what the cache holds keeps the
// limit from shrinking as the cache fills.
func (c *Cache) computeDefaultMaxBytes(
ctx context.Context, probe FreeSpaceProbeFunc,
) (int64, error) {
cacheDir := filepath.Join(c.config.StateDir, "cache")
freeBytes, err := probe(cacheDir)
if err != nil {
return 0, fmt.Errorf(
"default cache_max_bytes: cannot determine free space for %q: %w",
cacheDir, err)
}
usedBytes, err := c.UsageBytes(ctx)
if err != nil {
return 0, err
}
// Both terms are at most math.MaxInt64, so the sum cannot overflow.
//nolint:gosec // G115: UsageBytes sums file sizes, never negative
spaceBytes := min(freeBytes, math.MaxInt64) + uint64(usedBytes)
computed := spaceBytes / freeSpaceFractionDenominator * freeSpaceFractionNumerator
computed = min(computed, math.MaxInt64)
// gosec cannot see that min() above bounds computed, so it reads
// this conversion as potentially overflowing. It cannot: computed is
// at most math.MaxInt64 on every path here.
//nolint:gosec // G115: clamped to MaxInt64 by min above
limit := int64(computed)
limit = max(limit, DefaultCacheMaxBytesFloor)
return limit, nil
}
internal/imgcache/cachesize_internal_test.go
+188
View File
@@ -0,0 +1,188 @@
package imgcache
import (
"errors"
"os"
"path/filepath"
"strings"
"testing"
)
// Static errors returned by the stub free-space probes below.
var (
errTestStatfsFailed = errors.New("statfs failed")
errTestProbeNotExpected = errors.New("probe must not be called")
)
// TestComputeDefaultMaxBytesCountsWhatTheCacheHolds verifies that the
// default limit is 75% of the free space plus what the cache already
// holds, so a cache filled to its limit keeps that limit across a
// restart instead of shrinking to 75% of the space left free.
func TestComputeDefaultMaxBytesCountsWhatTheCacheHolds(t *testing.T) {
t.Parallel()
cache, _ := newEvictionTestCache(t, 1<<30)
// Empty cache, 4 GiB free -> 3 GiB default.
got, err := cache.computeDefaultMaxBytes(t.Context(),
func(string) (uint64, error) { return 4294967296, nil })
if err != nil {
t.Fatalf("computeDefaultMaxBytes returned error: %v", err)
}
t.Logf("default for an empty cache with 4 GiB free: %d", got)
if got != 3221225472 {
t.Errorf("default for an empty cache = %d, want 3221225472 (75%% of 4 GiB)",
got)
}
// The cache now holds those 3 GiB, which leaves 1 GiB free.
_, err = cache.db.ExecContext(t.Context(),
`INSERT INTO variant_content (cache_key, size_bytes, content_type)
VALUES (?, ?, ?)`,
string(testVariantKeyOne), 3221225472, testContentTypeWebP,
)
if err != nil {
t.Fatalf("failed to insert variant accounting row: %v", err)
}
got, err = cache.computeDefaultMaxBytes(t.Context(),
func(string) (uint64, error) { return 1073741824, nil })
if err != nil {
t.Fatalf("computeDefaultMaxBytes returned error: %v", err)
}
t.Logf("default for a cache holding 3 GiB with 1 GiB free: %d", got)
if got != 3221225472 {
t.Errorf("default for a cache holding 3 GiB with 1 GiB free = %d, "+
"want 3221225472 (75%% of 1 GiB + 3 GiB)", got)
}
}
// TestComputeDefaultMaxBytesAppliesFloor verifies that when 75% of the
// free space plus what the cache holds is below 500 MiB, the default
// is floored at DefaultCacheMaxBytesFloor.
func TestComputeDefaultMaxBytesAppliesFloor(t *testing.T) {
t.Parallel()
cases := []struct {
name string
freeBytes uint64
}{
{name: "100 MiB free", freeBytes: 104857600},
{name: "zero free", freeBytes: 0},
{name: "just below floor threshold", freeBytes: 699050665},
}
for _, tc := range cases {
t.Run(tc.name, func(t *testing.T) {
t.Parallel()
cache, _ := newEvictionTestCache(t, 1<<30)
got, err := cache.computeDefaultMaxBytes(t.Context(),
func(string) (uint64, error) { return tc.freeBytes, nil })
if err != nil {
t.Fatalf("computeDefaultMaxBytes returned error: %v", err)
}
if got != DefaultCacheMaxBytesFloor {
t.Errorf("computeDefaultMaxBytes = %d, want floor %d",
got, DefaultCacheMaxBytesFloor)
}
})
}
}
// TestComputeDefaultMaxBytesPropagatesProbeError verifies that a
// failing free-space probe produces an error naming cache_max_bytes,
// instead of a silently wrong default.
func TestComputeDefaultMaxBytesPropagatesProbeError(t *testing.T) {
t.Parallel()
cache, _ := newEvictionTestCache(t, 1<<30)
_, err := cache.computeDefaultMaxBytes(t.Context(),
func(string) (uint64, error) { return 0, errTestStatfsFailed })
if err == nil {
t.Fatal("probe failure must produce an error, got nil")
}
t.Logf("got expected error: %v", err)
if !strings.Contains(err.Error(), "cache_max_bytes") {
t.Errorf("error %q does not name cache_max_bytes", err.Error())
}
}
// TestNewCacheComputesDefaultMaxBytesWhenAsked verifies that with
// UseDefaultMaxBytes set, the cache's limit becomes the computed
// default, and that the probe is pointed at <state_dir>/cache/, which
// must be created first so statfs measures the right filesystem.
func TestNewCacheComputesDefaultMaxBytesWhenAsked(t *testing.T) {
t.Parallel()
stateDir := t.TempDir()
wantCacheDir := filepath.Join(stateDir, "cache")
var probedPath string
// 4 GiB free -> 3 GiB default.
probe := func(path string) (uint64, error) {
probedPath = path
info, err := os.Stat(path)
if err != nil || !info.IsDir() {
t.Errorf("cache directory %q was not created before probing: info=%v err=%v",
path, info, err)
}
return 4294967296, nil
}
cache, err := newCache(evictionTestDB(t), CacheConfig{
StateDir: stateDir,
UseDefaultMaxBytes: true,
}, probe)
if err != nil {
t.Fatalf("newCache returned error: %v", err)
}
if cache.config.MaxBytes != 3221225472 {
t.Errorf("MaxBytes = %d, want computed default 3221225472",
cache.config.MaxBytes)
}
if probedPath != wantCacheDir {
t.Errorf("free space probed at %q, want cache directory %q",
probedPath, wantCacheDir)
}
}
// TestNewCacheKeepsExplicitMaxBytes verifies that without
// UseDefaultMaxBytes the cache keeps MaxBytes exactly as given and
// never consults the free-space probe.
func TestNewCacheKeepsExplicitMaxBytes(t *testing.T) {
t.Parallel()
probe := func(string) (uint64, error) {
t.Error("free-space probe must not be consulted for explicit values")
return 0, errTestProbeNotExpected
}
cache, err := newCache(evictionTestDB(t), CacheConfig{
StateDir: t.TempDir(),
MaxBytes: 1024,
}, probe)
if err != nil {
t.Fatalf("newCache returned error: %v", err)
}
if cache.config.MaxBytes != 1024 {
t.Errorf("MaxBytes = %d, want explicit 1024 (no floor, no recompute)",
cache.config.MaxBytes)
}
}
internal/imgcache/concurrent_misses_internal_test.go
+509
View File
@@ -0,0 +1,509 @@
package imgcache
import (
"bytes"
"context"
"errors"
"image/jpeg"
"io"
"io/fs"
"strings"
"sync"
"sync/atomic"
"testing"
"time"
"github.com/getsentry/sentry-go"
"sneak.berlin/go/pixa/internal/httpfetcher"
"sneak.berlin/go/pixa/internal/magic"
)
// arrivalWait is how long a test gives requests it has started to reach the
// point where they wait for a held fetch.
const arrivalWait = 100 * time.Millisecond
// heldFetcher counts the fetches it is asked for and holds each one until
// releaseFetches is called, so that a test can have requests arrive while a
// fetch is in progress. started receives once for every fetch.
type heldFetcher struct {
upstream httpfetcher.Fetcher
fetches atomic.Int32
started chan struct{}
release chan struct{}
releaseOnce sync.Once
}
func (f *heldFetcher) Fetch(
ctx context.Context, url string,
) (*httpfetcher.FetchResult, error) {
f.fetches.Add(1)
f.started <- struct{}{}
select {
case <-f.release:
case <-ctx.Done():
return nil, ctx.Err()
}
return f.upstream.Fetch(ctx, url)
}
// releaseFetches lets every held fetch, and every later one, go on.
func (f *heldFetcher) releaseFetches() {
f.releaseOnce.Do(func() { close(f.release) })
}
// setupHeldFetchService returns a test service whose fetches go through a
// heldFetcher. Its database is limited to one connection: each connection to
// an in-memory SQLite database opens a new, empty one, so requests running at
// once must share the connection that holds the schema.
func setupHeldFetchService(t *testing.T) (*Service, *TestFixtures, *heldFetcher) {
t.Helper()
svc, fixtures := SetupTestService(t)
svc.cache.db.SetMaxOpenConns(1)
fetcher := &heldFetcher{
upstream: svc.fetcher,
started: make(chan struct{}, 100),
release: make(chan struct{}),
}
svc.fetcher = fetcher
t.Cleanup(fetcher.releaseFetches)
return svc, fixtures, fetcher
}
// photoVariant asks for the test photo, 100x100, at 50x25 as a JPEG of the
// given quality and fit mode. Each call returns a new request, as Get writes
// to the request it is given.
func photoVariant(fixtures *TestFixtures, quality int, fit FitMode) *ImageRequest {
return &ImageRequest{
SourceHost: fixtures.GoodHost,
SourcePath: testPathPhoto,
Size: Size{Width: 50, Height: 25},
Format: FormatJPEG,
Quality: quality,
FitMode: fit,
}
}
// getResult is what one Get call returned, with the image read out.
type getResult struct {
image []byte
err error
}
// startGet calls Get in a goroutine of its own and delivers what it returned
// on the channel.
func startGet(
ctx context.Context, svc *Service, req *ImageRequest,
) <-chan getResult {
results := make(chan getResult, 1)
go func() {
resp, err := svc.Get(ctx, req)
if err != nil {
results <- getResult{err: err}
return
}
defer func() { _ = resp.Content.Close() }()
image, err := io.ReadAll(resp.Content)
results <- getResult{image: image, err: err}
}()
return results
}
// jpegSize returns the width and height of the JPEG image in data, or 0 and 0
// if data is not one.
func jpegSize(data []byte) (int, int) {
config, err := jpeg.DecodeConfig(bytes.NewReader(data))
if err != nil {
return 0, 0
}
return config.Width, config.Height
}
// TestService_Get_ConcurrentMissesShareOneFetch starts several requests for
// one uncached variant while the first one's fetch is held. Between them they
// must fetch the source once and transcode it once, every one must be answered
// with the same 50x25 JPEG, and each must count one miss.
func TestService_Get_ConcurrentMissesShareOneFetch(t *testing.T) {
t.Parallel()
svc, fixtures, fetcher := setupHeldFetchService(t)
const requests = 8
pending := make([]<-chan getResult, 0, requests)
for range requests {
pending = append(pending,
startGet(t.Context(), svc, photoVariant(fixtures, 85, FitCover)))
}
<-fetcher.started
time.Sleep(arrivalWait)
fetcher.releaseFetches()
var first []byte
for i, results := range pending {
got := <-results
if got.err != nil {
t.Fatalf("request %d: Get() error = %v", i, got.err)
}
if width, height := jpegSize(got.image); width != 50 || height != 25 {
t.Errorf("request %d: image is %dx%d, want a 50x25 JPEG", i, width, height)
}
if first == nil {
first = got.image
} else if !bytes.Equal(got.image, first) {
t.Errorf("request %d: image differs from request 0's", i)
}
}
if fetches := fetcher.fetches.Load(); fetches != 1 {
t.Errorf("%d requests made %d upstream fetches, want 1", requests, fetches)
}
// NewTestFS builds the same files the test service's fetcher serves.
testFS, _ := NewTestFS(t)
photo, err := fs.ReadFile(testFS, fixtures.GoodHostJPEG)
if err != nil {
t.Fatal(err)
}
want := cacheStatsCounters{0, requests, 1, int64(len(photo)), 1}
if got := readCacheStatsCounters(t, svc.cache); got != want {
t.Errorf("counters = %+v, want %+v", got, want)
}
}
// TestService_Get_ConcurrentVariantsStayApart requests three variants of the
// test photo at once that differ only in quality or fit. Each must be made by
// a fetch and a transcode of its own, and each answer must be its own variant.
func TestService_Get_ConcurrentVariantsStayApart(t *testing.T) {
t.Parallel()
svc, fixtures, fetcher := setupHeldFetchService(t)
cover := startGet(t.Context(), svc, photoVariant(fixtures, 85, FitCover))
lowQuality := startGet(t.Context(), svc, photoVariant(fixtures, 40, FitCover))
contain := startGet(t.Context(), svc, photoVariant(fixtures, 85, FitContain))
for range 3 {
select {
case <-fetcher.started:
case <-time.After(5 * time.Second):
t.Fatal("fewer fetches started than variants requested: " +
"variants differing in quality or fit were merged")
}
}
fetcher.releaseFetches()
images := make(map[string][]byte)
for _, variant := range []struct {
name string
results <-chan getResult
width, height int
}{
{"q=85 fit=cover", cover, 50, 25},
{"q=40 fit=cover", lowQuality, 50, 25},
{"q=85 fit=contain", contain, 25, 25},
} {
got := <-variant.results
if got.err != nil {
t.Fatalf("%s: Get() error = %v", variant.name, got.err)
}
width, height := jpegSize(got.image)
if width != variant.width || height != variant.height {
t.Errorf("%s: image is %dx%d, want a %dx%d JPEG", variant.name,
width, height, variant.width, variant.height)
}
images[variant.name] = got.image
}
if bytes.Equal(images["q=85 fit=cover"], images["q=40 fit=cover"]) {
t.Error("q=40 was answered with the q=85 image")
}
}
// TestService_Get_WaiterStopsWhenItsContextEnds has a second request for a
// variant join the first one's held fetch, then ends the second request's
// context. The second request must return at once with the context's error,
// while the fetch is still held, and the first must still be answered.
func TestService_Get_WaiterStopsWhenItsContextEnds(t *testing.T) {
t.Parallel()
svc, fixtures, fetcher := setupHeldFetchService(t)
first := startGet(t.Context(), svc, photoVariant(fixtures, 85, FitCover))
<-fetcher.started
waiterCtx, cancelWaiter := context.WithCancel(t.Context())
waiter := startGet(waiterCtx, svc, photoVariant(fixtures, 85, FitCover))
time.Sleep(arrivalWait)
cancelWaiter()
select {
case got := <-waiter:
if !errors.Is(got.err, context.Canceled) {
t.Errorf("waiting request: Get() error = %v, want %v",
got.err, context.Canceled)
}
case <-time.After(time.Second):
t.Fatal("waiting request did not return when its context ended")
}
fetcher.releaseFetches()
got := <-first
if got.err != nil {
t.Fatalf("first request: Get() error = %v", got.err)
}
if width, height := jpegSize(got.image); width != 50 || height != 25 {
t.Errorf("first request: image is %dx%d, want a 50x25 JPEG", width, height)
}
if fetches := fetcher.fetches.Load(); fetches != 1 {
t.Errorf("upstream fetches = %d, want 1", fetches)
}
}
// TestService_Get_FirstRequestLeavingKeepsTheWork ends the context of the
// request whose fetch is held, after a second request has joined it. The fetch
// and transcode must go on and answer the second request. The first request
// waits for its own work, as every request did before misses were shared, and
// is answered too.
func TestService_Get_FirstRequestLeavingKeepsTheWork(t *testing.T) {
t.Parallel()
svc, fixtures, fetcher := setupHeldFetchService(t)
firstCtx, cancelFirst := context.WithCancel(t.Context())
first := startGet(firstCtx, svc, photoVariant(fixtures, 85, FitCover))
<-fetcher.started
second := startGet(t.Context(), svc, photoVariant(fixtures, 85, FitCover))
time.Sleep(arrivalWait)
cancelFirst()
fetcher.releaseFetches()
for name, results := range map[string]<-chan getResult{
"first request": first, "second request": second,
} {
got := <-results
if got.err != nil {
t.Fatalf("%s: Get() error = %v", name, got.err)
}
if width, height := jpegSize(got.image); width != 50 || height != 25 {
t.Errorf("%s: image is %dx%d, want a 50x25 JPEG", name, width, height)
}
}
if fetches := fetcher.fetches.Load(); fetches != 1 {
t.Errorf("upstream fetches = %d, want 1", fetches)
}
}
// TestService_Get_ConcurrentMissesShareAFailure has several requests for an
// image that cannot be served arrive while its fetch is held: the one fetch
// answers all of them with its error. The request after them is answered from
// the negative cache when the failure is kept there, and fetches again when it
// is not.
func TestService_Get_ConcurrentMissesShareAFailure(t *testing.T) {
t.Parallel()
tests := []struct {
name string
path string
wantErr error // what every request at once gets
wantNextErr error // what the request after them gets
wantFetches int32 // fetches once the request after them is answered
}{
{"upstream answers 404, kept in the negative cache",
"/images/missing.jpg", httpfetcher.ErrUpstreamError,
ErrNegativeCached, 1},
{"source fails the magic byte check, not kept",
"/images/text.png", magic.ErrUnknownFormat, magic.ErrUnknownFormat, 2},
}
for _, tc := range tests {
t.Run(tc.name, func(t *testing.T) {
t.Parallel()
svc, fixtures, fetcher := setupHeldFetchService(t)
request := func() *ImageRequest {
req := photoVariant(fixtures, 85, FitCover)
req.SourcePath = tc.path
return req
}
pending := make([]<-chan getResult, 0, 4)
for range 4 {
pending = append(pending, startGet(t.Context(), svc, request()))
}
<-fetcher.started
time.Sleep(arrivalWait)
fetcher.releaseFetches()
for i, results := range pending {
if got := <-results; !errors.Is(got.err, tc.wantErr) {
t.Errorf("request %d: Get() error = %v, want %v", i, got.err, tc.wantErr)
}
}
_, err := svc.Get(t.Context(), request())
if !errors.Is(err, tc.wantNextErr) {
t.Errorf("next request: Get() error = %v, want %v", err, tc.wantNextErr)
}
if fetches := fetcher.fetches.Load(); fetches != tc.wantFetches {
t.Errorf("upstream fetches = %d, want %d", fetches, tc.wantFetches)
}
})
}
}
// TestService_Get_EndedRequestFetchesNothing checks that a request whose
// context has already ended when it misses the cache starts no fetch.
func TestService_Get_EndedRequestFetchesNothing(t *testing.T) {
t.Parallel()
svc, fixtures, fetcher := setupHeldFetchService(t)
ctx, cancel := context.WithCancel(t.Context())
cancel()
_, err := svc.Get(ctx, photoVariant(fixtures, 85, FitCover))
if !errors.Is(err, context.Canceled) {
t.Errorf("Get() error = %v, want %v", err, context.Canceled)
}
if fetches := fetcher.fetches.Load(); fetches != 0 {
t.Errorf("upstream fetches = %d, want 0", fetches)
}
}
// TestService_Get_ReturnsByItsDeadline gives a request a deadline and holds
// its fetch until the fetch's context ends, as the fetcher does while it waits
// for a free connection to the host. The request must return by its deadline
// with the deadline's error.
func TestService_Get_ReturnsByItsDeadline(t *testing.T) {
t.Parallel()
svc, fixtures, _ := setupHeldFetchService(t)
const timeout = 200 * time.Millisecond
ctx, cancel := context.WithTimeout(t.Context(), timeout)
defer cancel()
results := startGet(ctx, svc, photoVariant(fixtures, 85, FitCover))
select {
case got := <-results:
if !errors.Is(got.err, context.DeadlineExceeded) {
t.Errorf("Get() error = %v, want %v", got.err, context.DeadlineExceeded)
}
case <-time.After(timeout + time.Second):
t.Fatal("request did not return by its deadline")
}
}
// panickingFetcher panics on every fetch.
type panickingFetcher struct{}
func (panickingFetcher) Fetch(
context.Context, string,
) (*httpfetcher.FetchResult, error) {
panic("upstream fetcher panicked")
}
// TestService_Get_PanicBecomesAnError checks that a panic while a variant is
// being made reaches its request as an error naming the panic, instead of
// being raised again.
func TestService_Get_PanicBecomesAnError(t *testing.T) {
t.Parallel()
svc, fixtures := SetupTestService(t)
svc.fetcher = panickingFetcher{}
var err error
func() {
defer func() {
if recovered := recover(); recovered != nil {
t.Fatalf("Get() panicked: %v", recovered)
}
}()
_, err = svc.Get(t.Context(), photoVariant(fixtures, 85, FitCover))
}()
if err == nil || !strings.Contains(err.Error(), "upstream fetcher panicked") {
t.Errorf("Get() error = %v, want one naming the panic", err)
}
}
// TestService_Get_PanicIsReportedToSentry checks that a panic while a variant
// is being made is reported through the Sentry hub on the request's context,
// where the Sentry middleware puts one when sentry_dsn is set.
func TestService_Get_PanicIsReportedToSentry(t *testing.T) {
t.Parallel()
svc, fixtures := SetupTestService(t)
svc.fetcher = panickingFetcher{}
transport := &sentry.MockTransport{}
client, err := sentry.NewClient(sentry.ClientOptions{
Dsn: "https://abc123@sentry.example.com/42",
Transport: transport,
})
if err != nil {
t.Fatal(err)
}
ctx := sentry.SetHubOnContext(t.Context(),
sentry.NewHub(client, sentry.NewScope()))
func() {
defer func() {
if recovered := recover(); recovered != nil {
t.Fatalf("Get() panicked: %v", recovered)
}
}()
_, _ = svc.Get(ctx, photoVariant(fixtures, 85, FitCover))
}()
events := transport.Events()
if len(events) != 1 || events[0].Message != "upstream fetcher panicked" {
t.Errorf("Sentry events = %+v, want one for the panic", events)
}
}
internal/imgcache/eviction.go
+72 -27
View File
@@ -39,8 +39,8 @@ const tempFilePrefix = ".tmp-"
// to each variant file.
const variantMetaSuffix = ".meta"
// fallbackContentType is recorded when a reconciled variant file has
// no readable .meta sidecar.
// fallbackContentType is the content type given to a variant file that
// has no readable .meta sidecar, when it is served or reconciled.
const fallbackContentType = "application/octet-stream"
// UsageBytes returns the total number of bytes of cache content
@@ -117,7 +117,10 @@ func (c *Cache) EvictToLimit(ctx context.Context) error {
// evictBatch fetches one batch of LRU candidates across variants and
// source blobs and evicts them oldest-first until excessBytes are
// freed or the batch is exhausted. It returns the bytes freed.
// freed or the batch is exhausted. It returns the bytes freed. A
// candidate that fails once ctx is cancelled (every one started after
// that fails at its first database call) ends the batch with ctx's
// error, without a warning.
func (c *Cache) evictBatch(ctx context.Context, excessBytes int64) (int64, error) {
candidates, err := c.evictionCandidates(ctx)
if err != nil {
@@ -133,6 +136,10 @@ func (c *Cache) evictBatch(ctx context.Context, excessBytes int64) (int64, error
err := c.evictCandidate(ctx, candidate)
if err != nil {
if ctx.Err() != nil {
return freed, ctx.Err()
}
c.log.Warn("failed to evict cache entry",
"cache_key", candidate.cacheKey,
"content_hash", candidate.contentHash,
@@ -271,7 +278,9 @@ func (c *Cache) sourceCandidates(ctx context.Context) ([]evictionCandidate, erro
// evictVariant removes one variant: accounting row first, then the
// content and .meta files, so the database never references a deleted
// file.
// file. The metaCache entry goes before the files; a GetVariant that
// read them just before may put it back, and the next GetVariant then
// fails to open the file and removes it again.
func (c *Cache) evictVariant(ctx context.Context, cacheKey VariantKey) error {
_, err := c.db.ExecContext(ctx,
`DELETE FROM variant_content WHERE cache_key = ?`, string(cacheKey))
@@ -279,7 +288,9 @@ func (c *Cache) evictVariant(ctx context.Context, cacheKey VariantKey) error {
return fmt.Errorf("failed to delete variant accounting row: %w", err)
}
err = c.variants.DeleteWithMeta(cacheKey)
c.metaCache.Remove(cacheKey)
err = c.variants.Delete(cacheKey)
if err != nil {
return err
}
@@ -420,37 +431,44 @@ func (c *Cache) notifyWritePressure() {
// startup and again on every periodic tick thereafter, and evicts to
// the configured limit on the given periodic interval and on
// write-pressure notifications. It is a no-op on a disabled cache or
// when already started.
// when already started. The goroutine outlives the caller, so it runs
// with its own context, which StopEviction cancels.
func (c *Cache) StartEviction(interval time.Duration) {
if c.disabled || c.evictionStarted {
if c.disabled || c.evictionCancel != nil {
return
}
c.evictionStarted = true
ctx, cancel := context.WithCancel(context.Background())
c.evictionCancel = cancel
go c.evictionLoop(interval)
go c.evictionLoop(ctx, interval)
}
// StopEviction stops the background eviction goroutine and waits for
// it to exit. It is safe to call when eviction was never started, and
// safe to call more than once.
func (c *Cache) StopEviction() {
if !c.evictionStarted {
return
// StopEviction cancels the background eviction goroutine, which
// interrupts a pass in progress, and waits for it to exit or for ctx to
// end, whichever comes first. In the second case it returns an error
// wrapping ctx's error. It is safe to call when eviction was never
// started, and safe to call more than once.
func (c *Cache) StopEviction(ctx context.Context) error {
if c.evictionCancel == nil {
return nil
}
c.evictionStopOnce.Do(func() {
close(c.evictionStop)
<-c.evictionDone
})
c.evictionCancel()
select {
case <-c.evictionDone:
return nil
case <-ctx.Done():
return fmt.Errorf("cache eviction still running: %w", ctx.Err())
}
}
// evictionLoop is the body of the background eviction goroutine.
func (c *Cache) evictionLoop(interval time.Duration) {
// evictionLoop is the body of the background eviction goroutine. It
// returns when ctx is cancelled, and starts no pass after that.
func (c *Cache) evictionLoop(ctx context.Context, interval time.Duration) {
defer close(c.evictionDone)
ctx := context.Background()
c.runReconciliationPass(ctx)
c.runEvictionPass(ctx)
@@ -459,7 +477,7 @@ func (c *Cache) evictionLoop(interval time.Duration) {
for {
select {
case <-c.evictionStop:
case <-ctx.Done():
return
case <-ticker.C:
// Reconciliation walks the cache directories, so it only
@@ -480,8 +498,13 @@ func (c *Cache) evictionLoop(interval time.Duration) {
}
// runEvictionPass runs one eviction pass, logging failures instead of
// propagating them (the loop must keep running).
// propagating them (the loop must keep running). It does nothing once
// ctx is cancelled.
func (c *Cache) runEvictionPass(ctx context.Context) {
if ctx.Err() != nil {
return
}
err := c.EvictToLimit(ctx)
if err != nil {
c.log.Warn("cache eviction pass failed", "error", err)
@@ -489,8 +512,13 @@ func (c *Cache) runEvictionPass(ctx context.Context) {
}
// runReconciliationPass runs one reconciliation pass, logging failures
// instead of propagating them (the loop must keep running).
// instead of propagating them (the loop must keep running). It does
// nothing once ctx is cancelled.
func (c *Cache) runReconciliationPass(ctx context.Context) {
if ctx.Err() != nil {
return
}
err := c.reconcileAccounting(ctx)
if err != nil {
c.log.Warn("cache accounting reconciliation failed", "error", err)
@@ -507,7 +535,8 @@ func (c *Cache) runReconciliationPass(ctx context.Context) {
// know (and rows whose files are gone), and sweeps stale temp files
// left behind by crashed writes. Running it periodically, not just
// once, bounds how long such drift can accumulate unaccounted for on a
// long-running process to one eviction interval.
// long-running process to one eviction interval. Once ctx is cancelled,
// it stops at the next file or row and returns ctx's error.
func (c *Cache) reconcileAccounting(ctx context.Context) error {
if c.disabled {
return nil
@@ -542,6 +571,10 @@ func (c *Cache) reconcileVariantFiles(ctx context.Context) error {
return filepath.WalkDir(
c.variants.baseDir,
func(path string, entry fs.DirEntry, err error) error {
if ctx.Err() != nil {
return ctx.Err()
}
if err != nil || entry.IsDir() {
return err
}
@@ -630,6 +663,10 @@ func (c *Cache) reconcileVariantRows(ctx context.Context) error {
}
for _, key := range keys {
if ctx.Err() != nil {
return ctx.Err()
}
if c.variants.Exists(key) {
continue
}
@@ -695,6 +732,10 @@ func (c *Cache) reconcileSourceFiles(ctx context.Context) error {
return filepath.WalkDir(
c.srcContent.baseDir,
func(path string, entry fs.DirEntry, err error) error {
if ctx.Err() != nil {
return ctx.Err()
}
if err != nil || entry.IsDir() {
return err
}
@@ -756,6 +797,10 @@ func (c *Cache) reconcileSourceRows(ctx context.Context) error {
}
for _, hash := range hashes {
if ctx.Err() != nil {
return ctx.Err()
}
if c.srcContent.Exists(hash) {
continue
}
internal/imgcache/eviction_internal_test.go
+320 -27
View File
@@ -4,9 +4,12 @@ import (
"bytes"
"context"
"database/sql"
"errors"
"io/fs"
"log/slog"
"os"
"path/filepath"
"strings"
"testing"
"time"
@@ -657,7 +660,7 @@ func TestEvictionRunsUnderWritePressure(t *testing.T) {
// An interval far longer than the test ensures only write
// pressure can trigger eviction here.
cache.StartEviction(time.Hour)
defer cache.StopEviction()
defer func() { _ = cache.StopEviction(t.Context()) }()
keys := []VariantKey{
testVariantKeyOne, testVariantKeyTwo, testVariantKeyThree,
@@ -678,6 +681,11 @@ func TestEvictionRunsUnderWritePressure(t *testing.T) {
assertNoDanglingReferences(t, cache)
}
// TestEvictionRunsOnPeriodicSchedule writes three variant files straight
// to disk, bypassing StoreVariant, so they have no accounting rows and no
// write-pressure notification fires. Only a periodic reconciliation pass
// can then adopt them, and only the eviction pass that follows it can
// evict them.
func TestEvictionRunsOnPeriodicSchedule(t *testing.T) {
t.Parallel()
@@ -685,12 +693,28 @@ func TestEvictionRunsOnPeriodicSchedule(t *testing.T) {
cache, _ := newEvictionTestCache(t, limit)
// Start the evictor while the cache is empty, then create tracked
// over-limit state WITHOUT going through the store methods, so no
// write-pressure notification fires and only the periodic ticker
// can trigger eviction.
// Hold the test database's only connection, so the startup pass
// waits for it after walking the still empty variant directory: the
// files written while it waits are first seen by a periodic pass.
conn, err := cache.db.Conn(t.Context())
if err != nil {
t.Fatalf("failed to take the database connection: %v", err)
}
defer func() { _ = conn.Close() }()
cache.StartEviction(100 * time.Millisecond)
defer cache.StopEviction()
defer func() { _ = cache.StopEviction(t.Context()) }()
deadline := time.Now().Add(5 * time.Second)
for cache.db.Stats().WaitCount == 0 {
if time.Now().After(deadline) {
t.Fatal("the startup pass never waited for the database")
}
time.Sleep(10 * time.Millisecond)
}
keys := []VariantKey{
testVariantKeyOne, testVariantKeyTwo, testVariantKeyThree,
@@ -700,25 +724,43 @@ func TestEvictionRunsOnPeriodicSchedule(t *testing.T) {
for i, key := range keys {
content := bytes.Repeat([]byte{fills[i]}, 1000)
_, err := cache.variants.Store(key, bytes.NewReader(content), "image/webp")
_, err = cache.variants.Store(key, bytes.NewReader(content), "image/webp")
if err != nil {
t.Fatalf("failed to store variant file: %v", err)
}
}
_, err = cache.db.ExecContext(t.Context(),
`INSERT INTO variant_content (cache_key, size_bytes, content_type)
VALUES (?, ?, ?)`,
string(key), len(content), "image/webp",
)
if err != nil {
t.Fatalf("failed to insert variant accounting row: %v", err)
_ = conn.Close()
// Only one of the 1000-byte files fits under the limit: wait until
// the evictor has removed the other two.
stored := len(keys)
deadline = time.Now().Add(5 * time.Second)
for stored > 1 && time.Now().Before(deadline) {
time.Sleep(25 * time.Millisecond)
stored = 0
for _, key := range keys {
if cache.variants.Exists(key) {
stored++
}
}
}
usage := waitForUsageAtOrBelow(t, cache, limit, 5*time.Second)
if stored > 1 {
t.Fatalf("periodic schedule did not trigger eviction: %d of %d "+
"variant files still on disk, want at most 1", stored, len(keys))
}
usage, err := cache.UsageBytes(t.Context())
if err != nil {
t.Fatalf("UsageBytes failed: %v", err)
}
if usage > limit {
t.Errorf("periodic schedule did not trigger eviction: usage = %d, want <= %d",
usage, limit)
t.Errorf("usage after eviction = %d, want <= %d", usage, limit)
}
assertNoDanglingReferences(t, cache)
@@ -751,7 +793,7 @@ func TestStartEvictionReconcilesAccountingWithDisk(t *testing.T) {
}
cache.StartEviction(time.Hour)
defer cache.StopEviction()
defer func() { _ = cache.StopEviction(t.Context()) }()
deadline := time.Now().Add(5 * time.Second)
@@ -805,15 +847,28 @@ func TestPeriodicReconciliationAdoptsFileThatAppearsAfterStartup(t *testing.T) {
cache, _ := newEvictionTestCache(t, 1<<30)
const interval = 100 * time.Millisecond
// Hold the test database's only connection, so the startup pass
// waits for it after walking the still empty variant directory: the
// file written while it waits is first seen by a periodic pass.
conn, err := cache.db.Conn(t.Context())
if err != nil {
t.Fatalf("failed to take the database connection: %v", err)
}
cache.StartEviction(interval)
defer cache.StopEviction()
defer func() { _ = conn.Close() }()
// Let startup reconciliation run and settle on an empty cache
// before introducing the untracked file, so the adoption we assert
// below can only be the work of a later, periodic pass.
time.Sleep(3 * interval)
cache.StartEviction(100 * time.Millisecond)
defer func() { _ = cache.StopEviction(t.Context()) }()
deadline := time.Now().Add(5 * time.Second)
for cache.db.Stats().WaitCount == 0 {
if time.Now().After(deadline) {
t.Fatal("the startup pass never waited for the database")
}
time.Sleep(10 * time.Millisecond)
}
// Simulate a variant whose accounting insert failed after the
// process was already running and serving requests: the content
@@ -822,14 +877,16 @@ func TestPeriodicReconciliationAdoptsFileThatAppearsAfterStartup(t *testing.T) {
// insert had failed and only the file write had succeeded.
untracked := bytes.Repeat([]byte{0x41}, 900)
_, err := cache.variants.Store(
_, err = cache.variants.Store(
"aabbccdd0099", bytes.NewReader(untracked), "image/webp",
)
if err != nil {
t.Fatalf("failed to store untracked variant file: %v", err)
}
deadline := time.Now().Add(5 * time.Second)
_ = conn.Close()
deadline = time.Now().Add(5 * time.Second)
var usage int64
@@ -862,6 +919,242 @@ func TestPeriodicReconciliationAdoptsFileThatAppearsAfterStartup(t *testing.T) {
}
}
// TestStopEvictionInterruptsPassInProgress holds the test database's
// only connection, so the startup reconciliation pass waits for it, and
// checks that StopEviction stops that pass instead of waiting for the
// connection to come free, and that the stop logs one warning: the
// interrupted reconciliation's, with no eviction pass started after it.
func TestStopEvictionInterruptsPassInProgress(t *testing.T) {
t.Parallel()
cache, _ := newEvictionTestCache(t, 1<<30)
var logBuf bytes.Buffer
cache.log = slog.New(slog.NewJSONHandler(&logBuf, nil))
conn, err := cache.db.Conn(t.Context())
if err != nil {
t.Fatalf("failed to take the database connection: %v", err)
}
defer func() { _ = conn.Close() }()
cache.StartEviction(time.Hour)
// The pass is in progress once it waits for the connection.
deadline := time.Now().Add(5 * time.Second)
for cache.db.Stats().WaitCount == 0 {
if time.Now().After(deadline) {
t.Fatal("the reconciliation pass never waited for the database")
}
time.Sleep(10 * time.Millisecond)
}
ctx, cancel := context.WithTimeout(t.Context(), 5*time.Second)
defer cancel()
err = cache.StopEviction(ctx)
t.Logf("StopEviction() error = %v", err)
if err != nil {
t.Fatalf("StopEviction() error = %v, want nil: the pass waiting for "+
"the database did not stop", err)
}
t.Logf("log output: %s", logBuf.String())
warnings := strings.Count(logBuf.String(), `"level":"WARN"`)
if warnings != 1 {
t.Errorf("the stop logged %d warnings, want 1", warnings)
}
}
// TestEvictToLimitStopsAtNextCandidateOnceCancelled cancels the context
// while the oldest of three source blobs is being evicted, and checks that
// EvictToLimit then returns context.Canceled without evicting the other
// two or logging a warning for either of them.
func TestEvictToLimitStopsAtNextCandidateOnceCancelled(t *testing.T) {
t.Parallel()
cache, _ := newEvictionTestCache(t, 1)
var logBuf bytes.Buffer
cache.log = slog.New(slog.NewJSONHandler(&logBuf, nil))
hashes := []ContentHash{
storeEvictionTestSource(t, cache, "cancel.example.com", "/a.jpg",
bytes.Repeat([]byte{0x61}, 1000)),
storeEvictionTestSource(t, cache, "cancel.example.com", "/b.jpg",
bytes.Repeat([]byte{0x62}, 1000)),
storeEvictionTestSource(t, cache, "cancel.example.com", "/c.jpg",
bytes.Repeat([]byte{0x63}, 1000)),
}
base := time.Now().Add(-time.Hour)
for i, hash := range hashes {
setSourceLastAccessed(t, cache, hash, base.Add(time.Duration(i)*time.Minute))
}
ctx, cancel := context.WithCancel(t.Context())
defer cancel()
cache.evictSourceBlobTestHook = func(ContentHash) { cancel() }
err := cache.EvictToLimit(ctx)
t.Logf("EvictToLimit() error = %v", err)
t.Logf("log output: %s", logBuf.String())
if !errors.Is(err, context.Canceled) {
t.Errorf("EvictToLimit() error = %v, want context.Canceled", err)
}
if cache.srcContent.Exists(hashes[0]) {
t.Errorf("source blob %s, evicted when the context was cancelled, "+
"is still on disk", hashes[0])
}
for _, hash := range hashes[1:] {
if !cache.srcContent.Exists(hash) {
t.Errorf("source blob %s was evicted after the context was cancelled", hash)
}
}
if strings.Contains(logBuf.String(), `"level":"WARN"`) {
t.Errorf("EvictToLimit logged a warning after the context was cancelled")
}
assertNoDanglingReferences(t, cache)
}
// TestStopEvictionReturnsWhenItsContextEnds pauses an eviction pass where
// cancellation cannot reach it, after a source blob's rows are deleted and
// before its file is removed, and checks that StopEviction returns its
// context's error when that context ends instead of waiting for the pass.
// Once the pass goes on, the goroutine exits and no row points at a
// missing file.
func TestStopEvictionReturnsWhenItsContextEnds(t *testing.T) {
t.Parallel()
cache, _ := newEvictionTestCache(t, 1)
paused := make(chan struct{})
resume := make(chan struct{})
cache.evictSourceBlobTestHook = func(ContentHash) {
close(paused)
<-resume
}
hash := storeEvictionTestSource(t, cache, "stop.example.com", "/a.jpg",
bytes.Repeat([]byte{0x61}, 1000))
cache.StartEviction(time.Hour)
select {
case <-paused:
case <-time.After(5 * time.Second):
t.Fatal("the eviction pass never reached the source blob")
}
ctx, cancel := context.WithTimeout(t.Context(), 50*time.Millisecond)
defer cancel()
err := cache.StopEviction(ctx)
t.Logf("StopEviction() error = %v", err)
if !errors.Is(err, context.DeadlineExceeded) {
t.Errorf("StopEviction() error = %v, want context.DeadlineExceeded", err)
}
close(resume)
err = cache.StopEviction(t.Context())
if err != nil {
t.Fatalf("second StopEviction() error = %v, want nil", err)
}
assertNoDanglingReferences(t, cache)
if cache.srcContent.Exists(hash) {
t.Errorf("source blob %s is still on disk after its rows were deleted", hash)
}
}
// TestReconciliationWalksStopOnceCancelled checks that both directory
// walks of a reconciliation pass return the context's error once it is
// cancelled, leaving in place a stale temp file they would otherwise
// remove.
func TestReconciliationWalksStopOnceCancelled(t *testing.T) {
t.Parallel()
cache, _ := newEvictionTestCache(t, 1<<30)
ctx, cancel := context.WithCancel(t.Context())
cancel()
staleTime := time.Now().Add(-2 * staleTempFileAge)
walks := map[string]func(context.Context) error{
cache.variants.baseDir: cache.reconcileVariantFiles,
cache.srcContent.baseDir: cache.reconcileSourceFiles,
}
for dir, walk := range walks {
tempFile := filepath.Join(dir, tempFilePrefix+"stale")
err := os.WriteFile(tempFile, []byte("partial"), 0o600)
if err != nil {
t.Fatalf("failed to write temp file: %v", err)
}
err = os.Chtimes(tempFile, staleTime, staleTime)
if err != nil {
t.Fatalf("failed to backdate temp file: %v", err)
}
err = walk(ctx)
t.Logf("walk of %s: error = %v", dir, err)
if !errors.Is(err, context.Canceled) {
t.Errorf("walk of %s: error = %v, want context.Canceled", dir, err)
}
_, err = os.Stat(tempFile)
if err != nil {
t.Errorf("walk of %s went on after cancellation: %v", dir, err)
}
}
}
// TestReconciliationPassLogsNoWarningOnceCancelled checks that a
// reconciliation pass run with an already cancelled context logs no
// warning, so a periodic tick the loop takes after a stop adds no
// warning to the one from the pass the stop interrupted.
func TestReconciliationPassLogsNoWarningOnceCancelled(t *testing.T) {
t.Parallel()
cache, _ := newEvictionTestCache(t, 1<<30)
var logBuf bytes.Buffer
cache.log = slog.New(slog.NewJSONHandler(&logBuf, nil))
ctx, cancel := context.WithCancel(t.Context())
cancel()
cache.runReconciliationPass(ctx)
t.Logf("log output: %s", logBuf.String())
if strings.Contains(logBuf.String(), `"level":"WARN"`) {
t.Errorf("runReconciliationPass logged a warning with a cancelled context")
}
}
// TestEvictSourceBlobExcludesConcurrentStoreOfIdenticalContent exercises
// the exact TOCTOU window between evictSourceBlob's row-deletion
// transaction commit and its content file unlink: a concurrent
internal/imgcache/imgcache.go
+6 -33
View File
@@ -5,7 +5,6 @@ import (
"context"
"errors"
"io"
"net/url"
"time"
)
@@ -95,7 +94,8 @@ type ImageRequest struct {
FitMode FitMode
// Signature is the HMAC signature for non-allowlisted hosts
Signature string
// Expires is the signature expiration timestamp
// Expires is when the URL expires: the exp of a signed URL, or the expiry
// of an encrypted URL; the zero time if it has none
Expires time.Time
// AllowHTTP indicates whether HTTP (non-TLS) is allowed for this request
AllowHTTP bool
@@ -153,18 +153,17 @@ type ImageCache interface {
// Warm pre-fetches and caches an image without returning it
Warm(ctx context.Context, req *ImageRequest) error
// Purge removes a cached image
Purge(ctx context.Context, req *ImageRequest) error
// Stats returns cache statistics
Stats(ctx context.Context) (*CacheStats, error)
}
// CacheStats contains cache statistics
type CacheStats struct {
// TotalItems is the number of cached items
// TotalItems is the number of cached source images plus processed
// variants
TotalItems int64
// TotalSizeBytes is the total size of cached content
// TotalSizeBytes is the total size of cached source images and
// processed variants
TotalSizeBytes int64
// HitCount is the number of cache hits
HitCount int64
@@ -173,29 +172,3 @@ type CacheStats struct {
// HitRate is HitCount / (HitCount + MissCount)
HitRate float64
}
// SignatureValidator validates request signatures
type SignatureValidator interface {
// Validate checks if the signature is valid for the request
Validate(req *ImageRequest) error
// Generate creates a signature for a request
Generate(req *ImageRequest) string
}
// Allowlist checks if a URL is allowlisted (no signature required)
type Allowlist interface {
// IsAllowlisted returns true if the URL doesn't require a signature
IsAllowlisted(u *url.URL) bool
}
// Storage handles persistent storage of cached content
type Storage interface {
// Store saves content and returns its hash
Store(ctx context.Context, content io.Reader) (hash string, err error)
// Load retrieves content by hash
Load(ctx context.Context, hash string) (io.ReadCloser, error)
// Delete removes content by hash
Delete(ctx context.Context, hash string) error
// Exists checks if content exists
Exists(ctx context.Context, hash string) (bool, error)
}
internal/imgcache/max_concurrent_processing_internal_test.go
+125
View File
@@ -0,0 +1,125 @@
package imgcache
import (
"image/color"
"image/jpeg"
"io"
"os"
"testing"
"time"
"sneak.berlin/go/pixa/internal/imageprocessor"
)
// widthOnlyRequest asks for the test photo at width, its height scaled to
// keep the photo's aspect ratio.
func widthOnlyRequest(fixtures *TestFixtures, width int) *ImageRequest {
return &ImageRequest{
SourceHost: fixtures.GoodHost,
SourcePath: testPathPhoto,
Size: Size{Width: width},
Format: FormatJPEG,
Quality: 85,
FitMode: FitCover,
}
}
// holdProcessingSlot takes one of proc's processing slots and returns the
// func that gives it back. Process takes its slot before it reads its input,
// so once it has read a byte from the pipe it holds the slot, until the pipe
// is closed.
func holdProcessingSlot(
t *testing.T, proc *imageprocessor.ImageProcessor,
) func() {
t.Helper()
input, feed := io.Pipe()
go func() {
_, _ = proc.Process(t.Context(), input, &imageprocessor.Request{})
}()
_, err := feed.Write([]byte{0})
if err != nil {
t.Fatalf("Process call to hold the slot did not start: %v", err)
}
release := func() { _ = feed.Close() }
t.Cleanup(release)
return release
}
// TestService_Get_WaitsForSlotBeforeReadingCachedSource checks that a
// request whose source is cached holds none of it while it waits for a
// processing slot: it reads the cached file only once it has a slot. With
// the only slot held, a request for a new width of the cached 100x100 photo
// waits; the cached file is then rewritten as a 100x50 image before the slot
// is freed, so the request must answer with that image scaled to 40x20.
func TestService_Get_WaitsForSlotBeforeReadingCachedSource(t *testing.T) {
t.Parallel()
svc, fixtures := SetupTestService(t)
svc.processor = imageprocessor.New(
imageprocessor.Params{MaxConcurrentProcessing: 1},
)
// A first request caches the photo as a source.
resp, err := svc.Get(t.Context(), widthOnlyRequest(fixtures, 50))
if err != nil {
t.Fatalf("first Get() error = %v", err)
}
_ = resp.Content.Close()
contentHash, _, err := svc.cache.LookupSource(t.Context(),
widthOnlyRequest(fixtures, 50))
if err != nil || contentHash == "" {
t.Fatalf("LookupSource() = %q, %v; want the cached source",
contentHash, err)
}
release := holdProcessingSlot(t, svc.processor)
var (
waited *ImageResponse
waitedErr error
)
done := make(chan struct{})
go func() {
defer close(done)
waited, waitedErr = svc.Get(t.Context(), widthOnlyRequest(fixtures, 40))
}()
// Give the request time to reach the slot: had it read the cached source
// before waiting, it would have read it by now.
time.Sleep(100 * time.Millisecond)
err = os.WriteFile(svc.cache.srcContent.hashToPath(contentHash),
generateTestJPEG(t, 100, 50, color.RGBA{0, 0, 255, 255}), 0o600)
if err != nil {
t.Fatalf("failed to rewrite the cached source: %v", err)
}
release()
<-done
if waitedErr != nil {
t.Fatalf("Get() error = %v", waitedErr)
}
defer func() { _ = waited.Content.Close() }()
output, err := jpeg.DecodeConfig(waited.Content)
if err != nil {
t.Fatalf("failed to decode the response: %v", err)
}
if output.Width != 40 || output.Height != 20 {
t.Errorf("response is %dx%d, want 40x20: the request read the cached "+
"source before it had a processing slot", output.Width, output.Height)
}
}
internal/imgcache/metacache_internal_test.go
+349
View File
@@ -0,0 +1,349 @@
package imgcache
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"os"
"sync"
"testing"
"time"
)
// webpRequest returns a request for a 100x100 WebP variant of path.
func webpRequest(path string) *ImageRequest {
return &ImageRequest{
SourceHost: testHostCDN,
SourcePath: path,
Size: Size{Width: 100, Height: 100},
Format: FormatWebP,
Quality: 85,
FitMode: FitCover,
}
}
// assertVariantServed checks that GetVariant serves key with the given
// content and the image/webp content type storeEvictionTestVariant stores.
func assertVariantServed(t *testing.T, cache *Cache, key VariantKey, content []byte) {
t.Helper()
reader, size, contentType, err := cache.GetVariant(key)
if err != nil {
t.Fatalf("GetVariant(%s) error = %v", key, err)
}
defer func() { _ = reader.Close() }()
got, err := io.ReadAll(reader)
if err != nil {
t.Fatalf("reading variant %s: %v", key, err)
}
if !bytes.Equal(got, content) {
t.Errorf("GetVariant(%s) content = %q, want %q", key, got, content)
}
if size != int64(len(content)) {
t.Errorf("GetVariant(%s) size = %d, want %d", key, size, len(content))
}
if contentType != testContentTypeWebP {
t.Errorf("GetVariant(%s) content type = %q, want %q",
key, contentType, testContentTypeWebP)
}
}
// assertVariantNotFound checks that GetVariant refuses key with
// ErrNotFound.
func assertVariantNotFound(t *testing.T, cache *Cache, key VariantKey) {
t.Helper()
reader, _, _, err := cache.GetVariant(key)
if err == nil {
_ = reader.Close()
}
if !errors.Is(err, ErrNotFound) {
t.Errorf("GetVariant(%s) error = %v, want ErrNotFound", key, err)
}
}
// assertLookupMisses checks that Lookup reports request as a miss.
func assertLookupMisses(t *testing.T, cache *Cache, request *ImageRequest) {
t.Helper()
lookup, err := cache.Lookup(t.Context(), request)
if err != nil {
t.Fatalf("Lookup(%s) error = %v", request.SourcePath, err)
}
if lookup.Hit {
t.Errorf("Lookup(%s) is a hit, want a miss", request.SourcePath)
}
}
// renameFile renames the file at from to to.
func renameFile(t *testing.T, from, to string) {
t.Helper()
err := os.Rename(from, to)
if err != nil {
t.Fatalf("renaming %s: %v", from, err)
}
}
// TestSecondHitDoesNotReadMetaFile checks that once a variant has been
// stored or read, a hit takes its content type from memory: with the
// .meta file deleted, GetVariant must still return the stored content
// type rather than the application/octet-stream it uses without one.
func TestSecondHitDoesNotReadMetaFile(t *testing.T) {
t.Parallel()
cache, _ := newEvictionTestCache(t, 1<<20)
content := []byte("webp variant bytes")
storeEvictionTestVariant(t, cache, testVariantKeyOne, content)
// A second Cache on the same state directory starts with nothing in
// memory, as pixad does after a restart, so its first read uses the
// .meta file.
restarted, err := NewCache(cache.db, cache.config)
if err != nil {
t.Fatalf("NewCache() error = %v", err)
}
assertVariantServed(t, restarted, testVariantKeyOne, content)
err = os.Remove(cache.variants.keyToPath(testVariantKeyOne) + ".meta")
if err != nil {
t.Fatalf("removing .meta file: %v", err)
}
assertVariantServed(t, cache, testVariantKeyOne, content)
assertVariantServed(t, restarted, testVariantKeyOne, content)
}
// TestReadDuringStoreKeepsStoredContentType checks that a GetVariant
// which began before StoreVariant finished cannot replace the content
// type the store kept in memory. Such a read can find the variant file
// but not yet its .meta file, and so gets application/octet-stream. The
// test deletes the .meta file after the store, then runs the part of
// GetVariant that comes after its check of memory.
func TestReadDuringStoreKeepsStoredContentType(t *testing.T) {
t.Parallel()
cache, _ := newEvictionTestCache(t, 1<<20)
content := []byte("webp variant bytes")
storeEvictionTestVariant(t, cache, testVariantKeyOne, content)
err := os.Remove(cache.variants.keyToPath(testVariantKeyOne) + ".meta")
if err != nil {
t.Fatalf("removing .meta file: %v", err)
}
reader, _, contentType, err := cache.loadVariantWithMeta(testVariantKeyOne)
if err != nil {
t.Fatalf("loadVariantWithMeta(%s) error = %v", testVariantKeyOne, err)
}
_ = reader.Close()
t.Logf("the read without a .meta file got content type %q", contentType)
assertVariantServed(t, cache, testVariantKeyOne, content)
}
// TestReadOfOlderMetaFileKeepsStoredContentType checks that a read
// which got its content type from a .meta file that StoreVariant had
// not yet rewritten cannot replace the type the store kept in memory.
// The test writes such a .meta file, with a different content type,
// after the store, then runs the part of GetVariant that comes after
// its check of memory.
func TestReadOfOlderMetaFileKeepsStoredContentType(t *testing.T) {
t.Parallel()
cache, _ := newEvictionTestCache(t, 1<<20)
content := []byte("webp variant bytes")
storeEvictionTestVariant(t, cache, testVariantKeyOne, content)
olderMeta, err := json.Marshal(VariantMeta{
ContentType: testContentTypeJPEG,
Size: int64(len(content)),
})
if err != nil {
t.Fatalf("encoding .meta file: %v", err)
}
metaPath := cache.variants.keyToPath(testVariantKeyOne) + ".meta"
err = os.WriteFile(metaPath, olderMeta, StorageFilePerm)
if err != nil {
t.Fatalf("writing .meta file: %v", err)
}
reader, _, contentType, err := cache.loadVariantWithMeta(testVariantKeyOne)
if err != nil {
t.Fatalf("loadVariantWithMeta(%s) error = %v", testVariantKeyOne, err)
}
_ = reader.Close()
if contentType != testContentTypeJPEG {
t.Fatalf("loadVariantWithMeta(%s) content type = %q, want %q from the .meta file",
testVariantKeyOne, contentType, testContentTypeJPEG)
}
kept, _ := cache.metaCache.Get(testVariantKeyOne)
if kept != testContentTypeWebP {
t.Errorf("content type in memory = %q, want the stored %q",
kept, testContentTypeWebP)
}
}
// TestFailedReadDuringStoreKeepsStoredContentType checks that a read
// which found no .meta file cannot leave application/octet-stream in
// memory, even when another read has removed the content type
// StoreVariant kept there. In this order: the store; a read that finds
// the variant in memory but cannot open its file, and so removes it
// from memory; a read that opened the variant file before the store
// wrote its .meta file. Later hits must get the stored content type.
func TestFailedReadDuringStoreKeepsStoredContentType(t *testing.T) {
t.Parallel()
cache, _ := newEvictionTestCache(t, 1<<20)
content := []byte("webp variant bytes")
variantPath := cache.variants.keyToPath(testVariantKeyOne)
metaPath := variantPath + ".meta"
storeEvictionTestVariant(t, cache, testVariantKeyOne, content)
renameFile(t, variantPath, variantPath+".hidden")
assertVariantNotFound(t, cache, testVariantKeyOne)
renameFile(t, variantPath+".hidden", variantPath)
renameFile(t, metaPath, metaPath+".hidden")
reader, _, contentType, err := cache.GetVariant(testVariantKeyOne)
if err != nil {
t.Fatalf("GetVariant(%s) error = %v", testVariantKeyOne, err)
}
_ = reader.Close()
t.Logf("the read without a .meta file got content type %q", contentType)
renameFile(t, metaPath+".hidden", metaPath)
assertVariantServed(t, cache, testVariantKeyOne, content)
}
// TestEvictedVariantIsNotServed checks that a variant the evictor
// removed is a miss and cannot be read, although it had been stored
// and served before.
func TestEvictedVariantIsNotServed(t *testing.T) {
t.Parallel()
cache, _ := newEvictionTestCache(t, 1500)
oldRequest := webpRequest("/old.jpg")
newRequest := webpRequest("/new.jpg")
oldKey := CacheKey(oldRequest)
newKey := CacheKey(newRequest)
oldContent := bytes.Repeat([]byte{0x01}, 1000)
newContent := bytes.Repeat([]byte{0x02}, 1000)
storeEvictionTestVariant(t, cache, oldKey, oldContent)
storeEvictionTestVariant(t, cache, newKey, newContent)
assertVariantServed(t, cache, oldKey, oldContent)
setVariantLastAccessed(t, cache, oldKey, time.Now().Add(-time.Hour))
err := cache.EvictToLimit(t.Context())
if err != nil {
t.Fatalf("EvictToLimit() error = %v", err)
}
assertLookupMisses(t, cache, oldRequest)
assertVariantNotFound(t, cache, oldKey)
assertVariantServed(t, cache, newKey, newContent)
}
// TestVariantDeletedFromDiskIsNotServed checks that a variant whose
// file was deleted by something other than the evictor cannot be read,
// and is a miss afterwards.
func TestVariantDeletedFromDiskIsNotServed(t *testing.T) {
t.Parallel()
cache, _ := newEvictionTestCache(t, 1<<20)
request := webpRequest("/deleted.jpg")
key := CacheKey(request)
content := []byte("webp variant bytes")
storeEvictionTestVariant(t, cache, key, content)
assertVariantServed(t, cache, key, content)
err := os.Remove(cache.variants.keyToPath(key))
if err != nil {
t.Fatalf("removing variant file: %v", err)
}
assertVariantNotFound(t, cache, key)
assertLookupMisses(t, cache, request)
}
// TestConcurrentVariantStoreReadAndEvict stores, reads and evicts
// variants from several goroutines at once, for the race detector.
func TestConcurrentVariantStoreReadAndEvict(t *testing.T) {
t.Parallel()
cache, _ := newEvictionTestCache(t, 1<<20)
ctx := t.Context()
var wg sync.WaitGroup
for goroutine := range 8 {
wg.Go(func() {
key := VariantKey(fmt.Sprintf("aabbccdd01%02d", goroutine))
content := []byte(key)
for range 20 {
err := cache.StoreVariant(
ctx, key, bytes.NewReader(content), testContentTypeWebP)
if err != nil {
t.Errorf("StoreVariant(%s) error = %v", key, err)
return
}
reader, _, contentType, err := cache.GetVariant(key)
if err != nil {
t.Errorf("GetVariant(%s) error = %v", key, err)
return
}
_ = reader.Close()
if contentType != testContentTypeWebP {
t.Errorf("GetVariant(%s) content type = %q, want %q",
key, contentType, testContentTypeWebP)
}
err = cache.evictVariant(ctx, key)
if err != nil {
t.Errorf("evictVariant(%s) error = %v", key, err)
return
}
assertVariantNotFound(t, cache, key)
}
})
}
wg.Wait()
}
internal/imgcache/service.go
+188 -65
View File
@@ -8,9 +8,13 @@ import (
"io"
"log/slog"
"net/url"
"runtime/debug"
"time"
"github.com/dustin/go-humanize"
"github.com/getsentry/sentry-go"
"github.com/go-chi/chi/v5/middleware"
"golang.org/x/sync/singleflight"
"sneak.berlin/go/pixa/internal/allowlist"
"sneak.berlin/go/pixa/internal/httpfetcher"
"sneak.berlin/go/pixa/internal/imageprocessor"
@@ -29,13 +33,17 @@ type Service struct {
log *slog.Logger
allowHTTP bool
maxResponseSize int64
// variantsInProgress lets the requests that miss the same variant at the
// same time share one fetch and one transcode.
variantsInProgress singleflight.Group
}
// ServiceConfig holds configuration for the image service.
type ServiceConfig struct {
// Cache is the cache instance
Cache *Cache
// FetcherConfig configures the upstream fetcher (ignored if Fetcher is set)
// FetcherConfig configures the upstream fetcher built when Fetcher is
// not set. Its AllowHTTP and MaxResponseSize are used either way.
FetcherConfig *httpfetcher.Config
// Fetcher is an optional custom fetcher (for testing)
Fetcher httpfetcher.Fetcher
@@ -43,15 +51,17 @@ type ServiceConfig struct {
SigningKey string
// Allowlist is the list of hosts that don't require signatures
Allowlist []string
// MaxConcurrentProcessing is the most images processed at once; zero
// uses the image processor's default, one per CPU
MaxConcurrentProcessing int
// Logger for logging
Logger *slog.Logger
}
// Static errors for service construction and unimplemented operations.
// Static errors for service construction.
var (
errCacheRequired = errors.New("cache is required")
errSigningKeyRequired = errors.New("signing key is required")
errPurgeNotImplemented = errors.New("purge not implemented")
errCacheRequired = errors.New("cache is required")
errSigningKeyRequired = errors.New("signing key is required")
)
// NewService creates a new image service.
@@ -91,9 +101,10 @@ func NewService(cfg *ServiceConfig) (*Service, error) {
}
maxResponseSize := fetcherCfg.MaxResponseSize
processor := imageprocessor.New(
imageprocessor.Params{MaxInputBytes: maxResponseSize},
)
processor := imageprocessor.New(imageprocessor.Params{
MaxInputBytes: maxResponseSize,
MaxConcurrentProcessing: cfg.MaxConcurrentProcessing,
})
return &Service{
cache: cfg.Cache,
@@ -143,7 +154,8 @@ func (s *Service) Get(ctx context.Context, req *ImageRequest) (*ImageResponse, e
s.log.Error("failed to get cached variant", "key", result.CacheKey, "error", err)
// Fall through to re-process
} else {
s.cache.IncrementStats(ctx, true, 0)
// Counted also when the request context has ended meanwhile
s.cache.IncrementStats(context.WithoutCancel(ctx), true, 0)
return &ImageResponse{
Content: reader,
@@ -155,12 +167,13 @@ func (s *Service) Get(ctx context.Context, req *ImageRequest) (*ImageResponse, e
}
}
// Cache miss - check if we have source content cached
cacheKey := CacheKey(req)
// Cache miss - get the variant, processed once for all the requests that
// miss it at the same time, then count this request's miss, also when it
// failed or the request context has ended meanwhile
response, err := s.processOrWait(ctx, req)
s.cache.IncrementStats(ctx, false, 0)
s.cache.IncrementStats(context.WithoutCancel(ctx), false, 0)
response, err := s.processFromSourceOrFetch(ctx, req, cacheKey)
if err != nil {
return nil, err
}
@@ -177,16 +190,17 @@ func (s *Service) Warm(ctx context.Context, req *ImageRequest) error {
return err
}
// Purge removes a cached image. Purging is not implemented yet.
func (s *Service) Purge(_ context.Context, _ *ImageRequest) error {
return errPurgeNotImplemented
}
// Stats returns cache statistics.
func (s *Service) Stats(ctx context.Context) (*CacheStats, error) {
return s.cache.Stats(ctx)
}
// WaitForProcessing waits until no image is being processed, or until ctx
// ends, and returns how many images were still being processed then.
func (s *Service) WaitForProcessing(ctx context.Context) int {
return s.processor.WaitForProcessing(ctx)
}
// ValidateRequest validates the request signature if required.
func (s *Service) ValidateRequest(req *ImageRequest) error {
// Check if host is allowed (no signature required)
@@ -233,38 +247,127 @@ func (s *Service) GenerateSignedURL(
baseURL, path, sig, exp, req.Quality, req.FitMode), nil
}
// loadCachedSource attempts to load source content from cache, returning nil
// if the cached data is unavailable or exceeds maxResponseSize.
func (s *Service) loadCachedSource(contentHash ContentHash) []byte {
reader, err := s.cache.GetSourceContent(contentHash)
// errPanicked is returned when processing a variant panicked.
var errPanicked = errors.New("panic while processing image")
// processOrWait returns the variant req asks for. The first of the requests
// that miss a variant at the same time processes it, and singleflight hands
// its result, or its error, to the others: they fetch nothing, read no source
// and take no upstream connection or processing slot. The processing ignores
// the first request's cancellation, so the others are still served if that
// client goes away, but keeps its deadline.
func (s *Service) processOrWait(
ctx context.Context, req *ImageRequest,
) (*ImageResponse, error) {
// A request that has already ended starts no processing
if ctx.Err() != nil {
return nil, ctx.Err()
}
cacheKey := CacheKey(req)
// Closed when this request's own function runs, which singleflight does
// only when no other request is processing the variant
processing := make(chan struct{})
results := s.variantsInProgress.DoChan(string(cacheKey),
func() (_ any, err error) {
close(processing)
// singleflight would raise a panic again in a goroutine of its
// own, where no handler recovers it, and stop pixad. It is
// reported through the Sentry hub that the Sentry middleware puts
// on the request's context when sentry_dsn is set.
defer func() {
recovered := recover()
if recovered != nil {
s.log.Error("panic while processing image",
"host", req.SourceHost, "path", req.SourcePath,
"panic", recovered, "stack", string(debug.Stack()))
if hub := sentry.GetHubFromContext(ctx); hub != nil {
hub.RecoverWithContext(ctx, recovered)
}
err = fmt.Errorf("%w: %v", errPanicked, recovered)
}
}()
processingCtx := context.WithoutCancel(ctx)
if deadline, ok := ctx.Deadline(); ok {
var cancel context.CancelFunc
processingCtx, cancel = context.WithDeadline(processingCtx, deadline)
defer cancel()
}
return s.processFromSourceOrFetch(processingCtx, req, cacheKey)
})
var result singleflight.Result
select {
case result = <-results:
case <-ctx.Done():
select {
case <-processing:
// This request is processing the variant: it waits for the
// result, as every request did before misses were shared
result = <-results
default:
// Another request is processing the variant, or this request's
// function has not started yet; the processing goes on without it
return nil, ctx.Err()
}
}
if result.Err != nil {
return nil, result.Err
}
variant, _ := result.Val.(*processedVariant)
return &ImageResponse{
Content: io.NopCloser(bytes.NewReader(variant.data)),
ContentLength: int64(len(variant.data)),
ContentType: variant.contentType,
FetchedBytes: variant.fetchedBytes,
ETag: formatETag(cacheKey),
}, nil
}
// loadCachedSource opens source content from cache, without reading it, and
// returns it with its size; nil if the cached data is unavailable, empty or
// exceeds maxResponseSize.
func (s *Service) loadCachedSource(
contentHash ContentHash,
) (io.ReadCloser, int64) {
reader, size, err := s.cache.GetSourceContent(contentHash)
if err != nil {
s.log.Warn("failed to load cached source, fetching", "error", err)
return nil
return nil, 0
}
// Bound the read to maxResponseSize to prevent unbounded memory use
// from unexpectedly large cached files.
limited := io.LimitReader(reader, s.maxResponseSize+1)
data, err := io.ReadAll(limited)
_ = reader.Close()
if size > s.maxResponseSize {
_ = reader.Close()
if err != nil {
s.log.Warn("failed to read cached source, fetching", "error", err)
return nil
}
if int64(len(data)) > s.maxResponseSize {
s.log.Warn("cached source exceeds max response size, discarding",
"hash", contentHash,
"max_bytes", s.maxResponseSize,
)
return nil
return nil, 0
}
return data
if size == 0 {
_ = reader.Close()
return nil, 0
}
return reader, size
}
// processFromSourceOrFetch processes an image, using cached source content
@@ -273,7 +376,7 @@ func (s *Service) processFromSourceOrFetch(
ctx context.Context,
req *ImageRequest,
cacheKey VariantKey,
) (*ImageResponse, error) {
) (*processedVariant, error) {
// Check if we have cached source content
contentHash, _, err := s.cache.LookupSource(ctx, req)
if err != nil {
@@ -281,37 +384,36 @@ func (s *Service) processFromSourceOrFetch(
}
var (
sourceData []byte
fetchBytes int64
source io.ReadCloser
sourceSize int64
)
if contentHash != "" {
s.log.Debug("using cached source", "hash", contentHash)
sourceData = s.loadCachedSource(contentHash)
source, sourceSize = s.loadCachedSource(contentHash)
}
// Fetch from upstream if we don't have source data or it's empty
if len(sourceData) == 0 {
resp, err := s.fetchAndProcess(ctx, req, cacheKey)
if err != nil {
return nil, err
}
return resp, nil
if source == nil {
return s.fetchAndProcess(ctx, req, cacheKey)
}
// Process using cached source
fetchBytes = int64(len(sourceData))
defer func() { _ = source.Close() }()
return s.processAndStore(ctx, req, cacheKey, sourceData, fetchBytes)
// Process using cached source; nothing was fetched from upstream. The
// image processor reads the source only once it has a processing slot,
// so a request waiting for one holds none of it in memory.
return s.processAndStore(ctx, req, cacheKey, source, sourceSize)
}
// fetchAndProcess fetches from upstream, processes, and caches the result.
// It counts the fetch with the bytes read from upstream, including when
// reading the response or a later step fails.
func (s *Service) fetchAndProcess(
ctx context.Context,
req *ImageRequest,
cacheKey VariantKey,
) (*ImageResponse, error) {
) (*processedVariant, error) {
// Fetch from upstream
sourceURL := req.SourceURL()
@@ -333,17 +435,24 @@ func (s *Service) fetchAndProcess(
return nil, fmt.Errorf("upstream fetch failed: %w", err)
}
// Closing the body frees the upstream connection. It is closed only
// after processing, so the fetcher's connection limit also bounds the
// fetched sources held in memory while their requests wait for a
// processing slot.
defer func() { _ = fetchResult.Content.Close() }()
// Read and validate the source content
sourceData, err := io.ReadAll(fetchResult.Content)
fetchBytes := int64(len(sourceData))
// Counted also when the request context has ended meanwhile
s.cache.IncrementUpstreamFetch(context.WithoutCancel(ctx), fetchBytes)
if err != nil {
return nil, fmt.Errorf("failed to read upstream response: %w", err)
}
// Calculate download bitrate
fetchBytes := int64(len(sourceData))
var downloadRate string
if fetchResult.FetchDurationMs > 0 {
@@ -354,6 +463,7 @@ func (s *Service) fetchAndProcess(
// Log upstream fetch details
s.log.Info("upstream fetched",
"request_id", middleware.GetReqID(ctx),
"host", req.SourceHost,
"path", req.SourcePath,
"bytes", fetchBytes,
@@ -378,17 +488,28 @@ func (s *Service) fetchAndProcess(
// Continue even if caching fails
}
return s.processAndStore(ctx, req, cacheKey, sourceData, fetchBytes)
return s.processAndStore(
ctx, req, cacheKey, bytes.NewReader(sourceData), fetchBytes,
)
}
// processAndStore processes an image and stores the result.
// processedVariant is a variant as processAndStore made it. Each request that
// shared its processing serves it through a reader of its own.
type processedVariant struct {
data []byte
contentType string
fetchedBytes int64
}
// processAndStore processes the image read from source and stores the
// result.
func (s *Service) processAndStore(
ctx context.Context,
req *ImageRequest,
cacheKey VariantKey,
sourceData []byte,
source io.Reader,
fetchBytes int64,
) (*ImageResponse, error) {
) (*processedVariant, error) {
// Process the image
processStart := time.Now()
@@ -399,13 +520,16 @@ func (s *Service) processAndStore(
FitMode: imageprocessor.FitMode(req.FitMode),
}
processResult, err := s.processor.Process(ctx, bytes.NewReader(sourceData), processReq)
processResult, err := s.processor.Process(ctx, source, processReq)
if err != nil {
return nil, fmt.Errorf("image processing failed: %w", err)
}
processDuration := time.Since(processStart)
// Counted also when the request context has ended meanwhile
s.cache.IncrementTransformCount(context.WithoutCancel(ctx))
// Read processed content
processedData, err := io.ReadAll(processResult.Content)
_ = processResult.Content.Close()
@@ -424,6 +548,7 @@ func (s *Service) processAndStore(
}
s.log.Info("image converted",
"request_id", middleware.GetReqID(ctx),
"host", req.SourceHost,
"path", req.SourcePath,
"src_format", processResult.InputFormat,
@@ -449,12 +574,10 @@ func (s *Service) processAndStore(
// Continue even if caching fails
}
return &ImageResponse{
Content: io.NopCloser(bytes.NewReader(processedData)),
ContentLength: outputSize,
ContentType: processResult.ContentType,
FetchedBytes: fetchBytes,
ETag: formatETag(cacheKey),
return &processedVariant{
data: processedData,
contentType: processResult.ContentType,
fetchedBytes: fetchBytes,
}, nil
}
internal/imgcache/stats_internal_test.go
+315 -1
View File
@@ -4,6 +4,9 @@ import (
"bytes"
"context"
"database/sql"
"image/color"
"io"
"io/fs"
"log/slog"
"math"
"strings"
@@ -11,6 +14,7 @@ import (
"time"
"sneak.berlin/go/pixa/internal/database"
"sneak.berlin/go/pixa/internal/httpfetcher"
)
func setupStatsTestDB(t *testing.T) *sql.DB {
@@ -125,7 +129,7 @@ func TestStats_LogsFailedCountQueries(t *testing.T) {
}
_, err = db.ExecContext(t.Context(),
`DROP TABLE request_cache; DROP TABLE output_content`)
`DROP TABLE source_content; DROP TABLE variant_content`)
if err != nil {
t.Fatal(err)
}
@@ -183,3 +187,313 @@ func TestIncrementStats_LogsFailedUpdates(t *testing.T) {
}
}
}
// TestStats_TotalsCountSourcesAndVariants verifies that TotalItems and
// TotalSizeBytes cover the stored source images and processed variants.
func TestStats_TotalsCountSourcesAndVariants(t *testing.T) {
t.Parallel()
cache, _ := newEvictionTestCache(t, 1<<30)
storeEvictionTestSource(t, cache, testHostCDN, testPathCat,
bytes.Repeat([]byte{0xAA}, 1000))
storeEvictionTestVariant(t, cache, testVariantKeyOne,
bytes.Repeat([]byte{0xAB}, 500))
storeEvictionTestVariant(t, cache, testVariantKeyTwo,
bytes.Repeat([]byte{0xAC}, 250))
stats, err := cache.Stats(t.Context())
if err != nil {
t.Fatalf("Stats() error = %v", err)
}
if stats.TotalItems != 3 {
t.Errorf("TotalItems = %d, want 3 (1 source, 2 variants)", stats.TotalItems)
}
if stats.TotalSizeBytes != 1750 {
t.Errorf("TotalSizeBytes = %d, want 1750 (1000+500+250)",
stats.TotalSizeBytes)
}
}
// TestStats_DisabledCacheReportsNoItems verifies that a disabled disk cache
// reports no items and no size, even when its database still holds the
// rows of an earlier run with the disk cache enabled.
func TestStats_DisabledCacheReportsNoItems(t *testing.T) {
t.Parallel()
enabled, _ := newEvictionTestCache(t, 1<<30)
storeEvictionTestSource(t, enabled, testHostCDN, testPathCat,
bytes.Repeat([]byte{0xAA}, 1000))
storeEvictionTestVariant(t, enabled, testVariantKeyOne,
bytes.Repeat([]byte{0xAB}, 500))
disabled, err := NewCache(enabled.db, CacheConfig{
StateDir: t.TempDir(),
CacheTTL: time.Hour,
NegativeTTL: 5 * time.Minute,
DisableDiskCache: true,
})
if err != nil {
t.Fatal(err)
}
stats, err := disabled.Stats(t.Context())
if err != nil {
t.Fatalf("Stats() error = %v", err)
}
if stats.TotalItems != 0 || stats.TotalSizeBytes != 0 {
t.Errorf("TotalItems = %d, TotalSizeBytes = %d, want 0 and 0",
stats.TotalItems, stats.TotalSizeBytes)
}
}
// cacheStatsCounters holds the counters of the cache_stats row, in column
// order.
type cacheStatsCounters struct {
hitCount int64
missCount int64
upstreamFetchCount int64
upstreamFetchBytes int64
transformCount int64
}
// readCacheStatsCounters reads the counters of the cache_stats row.
func readCacheStatsCounters(t *testing.T, cache *Cache) cacheStatsCounters {
t.Helper()
var got cacheStatsCounters
err := cache.db.QueryRowContext(t.Context(), `
SELECT hit_count, miss_count, upstream_fetch_count,
upstream_fetch_bytes, transform_count
FROM cache_stats WHERE id = 1
`).Scan(&got.hitCount, &got.missCount, &got.upstreamFetchCount,
&got.upstreamFetchBytes, &got.transformCount)
if err != nil {
t.Fatalf("failed to read cache_stats: %v", err)
}
return got
}
// TestService_Get_CountsStats walks Get through a miss that fetches the
// source, a hit, a miss that reuses the cached source, and two misses whose
// source cannot be used, checking every cache_stats counter after each.
func TestService_Get_CountsStats(t *testing.T) {
t.Parallel()
svc, fixtures := SetupTestService(t)
// NewTestFS builds the same files the test service's fetcher serves.
testFS, _ := NewTestFS(t)
photo, err := fs.ReadFile(testFS, fixtures.GoodHostJPEG)
if err != nil {
t.Fatal(err)
}
fake, err := fs.ReadFile(testFS, fixtures.InvalidFile)
if err != nil {
t.Fatal(err)
}
photoBytes, fakeBytes := int64(len(photo)), int64(len(fake))
// want is hits, misses, upstream fetches, upstream bytes, transforms.
steps := []struct {
name string
path string
size int
wantErr bool
want cacheStatsCounters
}{
{"miss that fetches the source", testPathPhoto, 50, false,
cacheStatsCounters{0, 1, 1, photoBytes, 1}},
{"hit", testPathPhoto, 50, false,
cacheStatsCounters{1, 1, 1, photoBytes, 1}},
{"miss that reuses the cached source", testPathPhoto, 25, false,
cacheStatsCounters{1, 2, 1, photoBytes, 2}},
{"miss whose source fails the magic byte check", "/images/fake.jpg", 50, true,
cacheStatsCounters{1, 3, 2, photoBytes + fakeBytes, 2}},
{"miss whose source is not found", "/images/nonexistent.jpg", 50, true,
cacheStatsCounters{1, 4, 2, photoBytes + fakeBytes, 2}},
}
for _, step := range steps {
resp, err := svc.Get(t.Context(), &ImageRequest{
SourceHost: fixtures.GoodHost,
SourcePath: step.path,
Size: Size{Width: step.size, Height: step.size},
Format: FormatJPEG,
Quality: 85,
FitMode: FitCover,
})
if (err != nil) != step.wantErr {
t.Fatalf("%s: Get() error = %v, want error %t", step.name, err, step.wantErr)
}
if err == nil {
_ = resp.Content.Close()
}
got := readCacheStatsCounters(t, svc.cache)
if got != step.want {
t.Fatalf("after the %s: counters = %+v, want %+v", step.name, got, step.want)
}
}
}
// fakeUpstream answers every fetch with itself as a JPEG body. The body
// serves data, then calls cancel, when set, and returns err; io.EOF ends
// the body normally.
type fakeUpstream struct {
data *bytes.Reader
cancel context.CancelFunc
err error
}
func (u *fakeUpstream) Fetch(
context.Context, string,
) (*httpfetcher.FetchResult, error) {
return &httpfetcher.FetchResult{
Content: io.NopCloser(u),
ContentLength: -1,
ContentType: testContentTypeJPEG,
}, nil
}
func (u *fakeUpstream) Read(p []byte) (int, error) {
if u.data.Len() > 0 {
return u.data.Read(p)
}
if u.cancel != nil {
u.cancel()
}
return 0, u.err
}
// TestService_Get_CountsInterruptedMisses checks every cache_stats counter
// after a miss whose request context ends during or after the upstream
// fetch, and after a miss whose upstream body is over the size limit.
func TestService_Get_CountsInterruptedMisses(t *testing.T) {
t.Parallel()
photo := generateTestJPEG(t, 100, 100, color.RGBA{255, 0, 0, 255})
half := len(photo) / 2
// want is hits, misses, upstream fetches, upstream bytes, transforms.
tests := []struct {
name string
served int // bytes of the photo the upstream body serves
cancel bool // whether the body then ends the request context
readErr error // what the body then returns
wantErr bool
want cacheStatsCounters
}{
{"request context ends during the fetch", half, true, context.Canceled, true,
cacheStatsCounters{0, 1, 1, int64(half), 0}},
{"request context ends after the fetch", len(photo), true, io.EOF, false,
cacheStatsCounters{0, 1, 1, int64(len(photo)), 1}},
{"upstream body over the size limit", half, false,
httpfetcher.ErrResponseTooLarge, true,
cacheStatsCounters{0, 1, 1, int64(half), 0}},
}
for _, tc := range tests {
t.Run(tc.name, func(t *testing.T) {
t.Parallel()
svc, fixtures := SetupTestService(t)
ctx, cancel := context.WithCancel(t.Context())
defer cancel()
upstream := &fakeUpstream{
data: bytes.NewReader(photo[:tc.served]),
err: tc.readErr,
}
if tc.cancel {
upstream.cancel = cancel
}
svc.fetcher = upstream
resp, err := svc.Get(ctx, &ImageRequest{
SourceHost: fixtures.GoodHost,
SourcePath: testPathPhoto,
Size: Size{Width: 50, Height: 50},
Format: FormatJPEG,
Quality: 85,
FitMode: FitCover,
})
t.Logf("Get() error = %v", err)
if (err != nil) != tc.wantErr {
t.Fatalf("Get() error = %v, want error %t", err, tc.wantErr)
}
if err == nil {
_ = resp.Content.Close()
}
got := readCacheStatsCounters(t, svc.cache)
if got != tc.want {
t.Errorf("counters = %+v, want %+v", got, tc.want)
}
})
}
}
// TestService_Get_CountsHitAfterRequestEnds checks every cache_stats counter
// after a hit served with a request context that has already ended: only
// the hit count moves.
func TestService_Get_CountsHitAfterRequestEnds(t *testing.T) {
t.Parallel()
svc, fixtures := SetupTestService(t)
req := &ImageRequest{
SourceHost: fixtures.GoodHost,
SourcePath: testPathPhoto,
Size: Size{Width: 50, Height: 50},
Format: FormatJPEG,
Quality: 85,
FitMode: FitCover,
}
// A first request caches the variant.
resp, err := svc.Get(t.Context(), req)
if err != nil {
t.Fatalf("first Get() error = %v", err)
}
_ = resp.Content.Close()
want := readCacheStatsCounters(t, svc.cache)
want.hitCount++
ctx, cancel := context.WithCancel(t.Context())
cancel()
resp, err = svc.Get(ctx, req)
if err != nil {
t.Fatalf("Get() with an ended request context: error = %v", err)
}
_ = resp.Content.Close()
if resp.CacheStatus != CacheHit {
t.Fatalf("CacheStatus = %v, want %v", resp.CacheStatus, CacheHit)
}
got := readCacheStatsCounters(t, svc.cache)
if got != want {
t.Errorf("counters = %+v, want %+v", got, want)
}
}
internal/imgcache/storage.go
+27 -25
View File
@@ -506,32 +506,44 @@ func (s *VariantStorage) Load(key VariantKey) (io.ReadCloser, error) {
return f, nil
}
// LoadWithMeta returns a reader, size, and content type for the content at
// the given key.
func (s *VariantStorage) LoadWithMeta(
key VariantKey,
) (io.ReadCloser, int64, string, error) {
// LoadWithSize returns a reader and file size for the content at the
// given key.
func (s *VariantStorage) LoadWithSize(key VariantKey) (io.ReadCloser, int64, error) {
path := s.keyToPath(key)
metaPath := path + ".meta"
f, err := os.Open(path) //nolint:gosec // path derived from cache key
if err != nil {
if os.IsNotExist(err) {
return nil, 0, "", ErrNotFound
return nil, 0, ErrNotFound
}
return nil, 0, "", fmt.Errorf("failed to open content: %w", err)
return nil, 0, fmt.Errorf("failed to open content: %w", err)
}
stat, err := f.Stat()
if err != nil {
_ = f.Close()
return nil, 0, "", fmt.Errorf("failed to stat content: %w", err)
return nil, 0, fmt.Errorf("failed to stat content: %w", err)
}
// Load metadata for content type
contentType := "application/octet-stream" // fallback
return f, stat.Size(), nil
}
// LoadWithMeta returns a reader, size, and content type for the content at
// the given key. The content type is read from the .meta file, and is
// empty when that file is missing or unreadable.
func (s *VariantStorage) LoadWithMeta(
key VariantKey,
) (io.ReadCloser, int64, string, error) {
f, size, err := s.LoadWithSize(key)
if err != nil {
return nil, 0, "", err
}
var contentType string
metaPath := s.keyToPath(key) + ".meta"
metaData, err := os.ReadFile(metaPath) //nolint:gosec // path derived from cache key
if err == nil {
@@ -541,7 +553,7 @@ func (s *VariantStorage) LoadWithMeta(
}
}
return f, stat.Size(), contentType, nil
return f, size, contentType, nil
}
// Exists checks if content exists at the given key.
@@ -552,7 +564,8 @@ func (s *VariantStorage) Exists(key VariantKey) bool {
return err == nil
}
// Delete removes content at the given key.
// Delete removes the content at the given key together with its .meta
// sidecar file. A missing file is not an error.
func (s *VariantStorage) Delete(key VariantKey) error {
path := s.keyToPath(key)
@@ -561,18 +574,7 @@ func (s *VariantStorage) Delete(key VariantKey) error {
return fmt.Errorf("failed to delete content: %w", err)
}
return nil
}
// DeleteWithMeta removes the content at the given key together with
// its .meta sidecar file. A missing file is not an error.
func (s *VariantStorage) DeleteWithMeta(key VariantKey) error {
err := s.Delete(key)
if err != nil {
return err
}
metaPath := s.keyToPath(key) + ".meta"
metaPath := path + ".meta"
err = os.Remove(metaPath)
if err != nil && !os.IsNotExist(err) {
internal/imgcache/storage_internal_test.go
+70
View File
@@ -438,3 +438,73 @@ func TestVariantStorage_StoreLogsFailedMetaWrite(t *testing.T) {
t.Errorf("log missing %s; got %q", want, logBuf.String())
}
}
// storeTestVariant stores one variant, with its .meta file, in a new
// VariantStorage and returns the storage and the variant's key.
func storeTestVariant(t *testing.T) (*VariantStorage, VariantKey) {
t.Helper()
storage, err := NewVariantStorage(t.TempDir(), slog.New(slog.DiscardHandler))
if err != nil {
t.Fatalf("NewVariantStorage() error = %v", err)
}
key := CacheKey(&ImageRequest{SourceHost: testHostCDN, SourcePath: testPathCat})
_, err = storage.Store(key, bytes.NewReader([]byte("variant data")), "image/webp")
if err != nil {
t.Fatalf("Store() error = %v", err)
}
return storage, key
}
// TestVariantStorage_DeleteRemovesMeta verifies that Delete removes the
// variant's .meta file along with the variant file.
func TestVariantStorage_DeleteRemovesMeta(t *testing.T) {
t.Parallel()
storage, key := storeTestVariant(t)
metaPath := storage.keyToPath(key) + ".meta"
_, err := os.Stat(metaPath)
if err != nil {
t.Fatalf("Store() wrote no .meta file: %v", err)
}
err = storage.Delete(key)
if err != nil {
t.Fatalf("Delete() error = %v", err)
}
if storage.Exists(key) {
t.Error("Exists() = true after delete, want false")
}
_, err = os.Stat(metaPath)
if !os.IsNotExist(err) {
t.Errorf(".meta file left after Delete() (stat err=%v)", err)
}
}
// TestVariantStorage_DeleteWithoutMeta verifies that Delete succeeds for a
// variant whose .meta file is missing.
func TestVariantStorage_DeleteWithoutMeta(t *testing.T) {
t.Parallel()
storage, key := storeTestVariant(t)
err := os.Remove(storage.keyToPath(key) + ".meta")
if err != nil {
t.Fatalf("removing .meta file: %v", err)
}
err = storage.Delete(key)
if err != nil {
t.Fatalf("Delete() error = %v, want nil", err)
}
if storage.Exists(key) {
t.Error("Exists() = true after delete, want false")
}
}
internal/imgcache/testutil_internal_test.go
+1
View File
@@ -24,6 +24,7 @@ const (
testHostExample = "example.com"
testPathCat = "/photos/cat.jpg"
testContentTypeJPEG = "image/jpeg"
testContentTypeWebP = "image/webp"
testHeaderContentType = "Content-Type"
)
internal/middleware/middleware.go
+33 -7
View File
@@ -2,9 +2,12 @@
package middleware
import (
"context"
"crypto/rand"
"log/slog"
"net/http"
"net/netip"
"regexp"
"time"
basicauth "github.com/99designs/basicauth-go"
@@ -32,13 +35,10 @@ const HSTSValue = "max-age=31536000; includeSubDomains"
// ContentSecurityPolicyValue is the Content-Security-Policy header value.
// default-src 'self' is the baseline and frame-ancestors 'none' is the primary
// clickjacking control. 'unsafe-inline' is required in script-src and style-src
// because the served templates carry inline onclick handlers (generator page)
// and the bundled Tailwind asset injects a runtime <style> element; dropping it
// needs template changes outside this issue's scope.
// clickjacking control.
const ContentSecurityPolicyValue = "default-src 'self'; " +
"script-src 'self' 'unsafe-inline'; " +
"style-src 'self' 'unsafe-inline'; " +
"script-src 'self'; " +
"style-src 'self'; " +
"object-src 'none'; " +
"base-uri 'self'; " +
"form-action 'self'; " +
@@ -115,6 +115,32 @@ func (s *Middleware) RateLimit(
})
}
// requestIDPattern is what a request's own X-Request-Id must look like to be
// kept as its ID: 1 to 64 letters, digits, '-', '_' or '.'.
var requestIDPattern = regexp.MustCompile(`^[A-Za-z0-9._-]{1,64}$`)
// RequestID returns a middleware that gives each request an ID and sends it as
// the X-Request-Id response header, so a client can quote it when reporting a
// problem. The ID is the request's own X-Request-Id when that matches
// requestIDPattern, and otherwise a random one, which tells nothing about the
// machine or the traffic. It is stored in the request context under chi's
// RequestIDKey, where the logging middleware, the handlers and the upstream
// fetch read it.
func (s *Middleware) RequestID() func(http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
id := r.Header.Get(middleware.RequestIDHeader)
if !requestIDPattern.MatchString(id) {
id = rand.Text()
}
w.Header().Set(middleware.RequestIDHeader, id)
ctx := context.WithValue(r.Context(), middleware.RequestIDKey, id)
next.ServeHTTP(w, r.WithContext(ctx))
})
}
}
type loggingResponseWriter struct {
http.ResponseWriter
@@ -172,7 +198,7 @@ func (s *Middleware) Logging() func(http.Handler) http.Handler {
// CORS returns a CORS middleware.
func (s *Middleware) CORS() func(http.Handler) http.Handler {
return cors.Handler(cors.Options{
AllowedOrigins: []string{"*"},
AllowedOrigins: []string{s.config.AccessControlAllowOrigin},
AllowedMethods: []string{"GET", "HEAD", "OPTIONS"},
AllowedHeaders: []string{"Accept", "Authorization", "Content-Type"},
ExposedHeaders: []string{"Link"},
internal/middleware/middleware_internal_test.go
+258 -2
View File
@@ -1,14 +1,263 @@
package middleware
import (
"bytes"
"log/slog"
"net/http"
"net/http/httptest"
"net/url"
"strings"
"testing"
"github.com/prometheus/client_golang/prometheus/promhttp"
"sneak.berlin/go/pixa/internal/config"
)
// TestCORSAnswersWithConfiguredOrigin checks that the CORS middleware
// answers with access_control_allow_origin, where "*" lets any origin read
// responses and a single origin lets only that origin read them.
func TestCORSAnswersWithConfiguredOrigin(t *testing.T) {
t.Parallel()
const appOrigin = "https://app.example.com"
cases := []struct {
configured string
requestOrigin string
want string
}{
{"*", "https://any.example.com", "*"},
{appOrigin, appOrigin, appOrigin},
{appOrigin, "https://other.example.com", ""},
}
testHandler := http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
w.WriteHeader(http.StatusOK)
})
for _, tc := range cases {
mw := &Middleware{
log: slog.Default(),
config: &config.Config{AccessControlAllowOrigin: tc.configured},
}
handler := mw.CORS()(testHandler)
req := httptest.NewRequestWithContext(
t.Context(), http.MethodGet, "/v1/image/example.com/a.jpg/1x1.png", nil)
req.Header.Set("Origin", tc.requestOrigin)
rec := httptest.NewRecorder()
handler.ServeHTTP(rec, req)
got := rec.Header().Get("Access-Control-Allow-Origin")
if got != tc.want {
t.Errorf("configured %q, request from %q: "+
"Access-Control-Allow-Origin = %q, want %q",
tc.configured, tc.requestOrigin, got, tc.want)
}
}
}
// TestCORSAnswersPreflightWithConfiguredOrigin checks that the CORS
// middleware answers a preflight request, which the CORS library handles
// apart from other requests, the same way: "*" lets any origin read
// responses and a single origin lets only that origin read them.
func TestCORSAnswersPreflightWithConfiguredOrigin(t *testing.T) {
t.Parallel()
const appOrigin = "https://app.example.com"
cases := []struct {
configured string
requestOrigin string
want string
}{
{"*", "https://any.example.com", "*"},
{appOrigin, appOrigin, appOrigin},
{appOrigin, "https://other.example.com", ""},
}
testHandler := http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
w.WriteHeader(http.StatusOK)
})
for _, tc := range cases {
mw := &Middleware{
log: slog.Default(),
config: &config.Config{AccessControlAllowOrigin: tc.configured},
}
handler := mw.CORS()(testHandler)
// An OPTIONS request naming the method it asks about is the
// preflight a browser sends before some cross-origin requests.
req := httptest.NewRequestWithContext(
t.Context(), http.MethodOptions, "/v1/image/example.com/a.jpg/1x1.png", nil)
req.Header.Set("Origin", tc.requestOrigin)
req.Header.Set("Access-Control-Request-Method", http.MethodGet)
rec := httptest.NewRecorder()
handler.ServeHTTP(rec, req)
got := rec.Header().Get("Access-Control-Allow-Origin")
if got != tc.want {
t.Errorf("configured %q, preflight from %q: "+
"Access-Control-Allow-Origin = %q, want %q",
tc.configured, tc.requestOrigin, got, tc.want)
}
}
}
// TestMetricsAuthRequiresConfiguredCredentials checks that MetricsAuth on
// its own answers 401 with a challenge to a request without credentials or
// with a wrong username or password, and lets a request with the configured
// username and password through. That the router puts it in front of
// /metrics is not tested.
func TestMetricsAuthRequiresConfiguredCredentials(t *testing.T) {
t.Parallel()
const (
username = "metricsuser"
password = "metricspass"
challenge = `Basic realm="metrics"`
)
// An empty username stands for a request sent without credentials.
cases := []struct {
name string
username string
password string
wantReached bool
}{
{"no credentials", "", "", false},
{"wrong username", "someone", password, false},
{"wrong password", username, "wrongpass", false},
{"configured credentials", username, password, true},
}
for _, tc := range cases {
t.Run(tc.name, func(t *testing.T) {
t.Parallel()
mw := &Middleware{
log: slog.Default(),
config: &config.Config{
MetricsUsername: username,
MetricsPassword: password,
},
}
reached := false
handler := mw.MetricsAuth()(http.HandlerFunc(
func(http.ResponseWriter, *http.Request) {
reached = true
}))
req := httptest.NewRequestWithContext(
t.Context(), http.MethodGet, "/metrics", nil)
if tc.username != "" {
req.SetBasicAuth(tc.username, tc.password)
}
rec := httptest.NewRecorder()
handler.ServeHTTP(rec, req)
if reached != tc.wantReached {
t.Fatalf("request reached /metrics = %v, want %v",
reached, tc.wantReached)
}
if tc.wantReached {
return
}
if rec.Code != http.StatusUnauthorized {
t.Errorf("status = %d, want %d",
rec.Code, http.StatusUnauthorized)
}
if got := rec.Header().Get("WWW-Authenticate"); got != challenge {
t.Errorf("WWW-Authenticate = %q, want %q", got, challenge)
}
})
}
}
// TestMetricsRecordsServedRequest checks that the metrics middleware
// records a request it served, so /metrics reports it. It is the only test
// in this package that sets up the metrics middleware, which registers with
// the process-wide Prometheus registry and can do so only once.
func TestMetricsRecordsServedRequest(t *testing.T) {
t.Parallel()
// The line /metrics shows once one GET /test has been served.
const want = `http_request_duration_seconds_count{` +
`code="200",handler="/test",method="GET",service=""} 1`
mw := &Middleware{log: slog.Default(), config: &config.Config{}}
handler := mw.Metrics()(http.HandlerFunc(
func(w http.ResponseWriter, _ *http.Request) {
w.WriteHeader(http.StatusOK)
}))
handler.ServeHTTP(httptest.NewRecorder(), httptest.NewRequestWithContext(
t.Context(), http.MethodGet, "/test", nil))
rec := httptest.NewRecorder()
promhttp.Handler().ServeHTTP(rec, httptest.NewRequestWithContext(
t.Context(), http.MethodGet, "/metrics", nil))
if !strings.Contains(rec.Body.String(), want) {
t.Errorf("/metrics does not report the GET /test served; "+
"want the line %q in:\n%s", want, rec.Body.String())
}
}
// TestLoggingLeavesOutSubmittedSigningKey checks that a login, a POST /
// whose form carries the signing key, leaves no trace of the key in the
// request's log line.
func TestLoggingLeavesOutSubmittedSigningKey(t *testing.T) {
t.Parallel()
const signingKey = "test-signing-key-0123456789abcdef"
var buf bytes.Buffer
mw := newTestMiddleware(t, &buf)
// The handler reads the key from the form, as the login handler does.
handler := mw.Logging()(http.HandlerFunc(
func(w http.ResponseWriter, r *http.Request) {
if got := r.FormValue("key"); got != signingKey {
t.Errorf("key in form = %q, want %q", got, signingKey)
}
w.WriteHeader(http.StatusSeeOther)
}))
form := url.Values{"key": {signingKey}}
req := httptest.NewRequestWithContext(t.Context(), http.MethodPost, "/",
strings.NewReader(form.Encode()))
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
handler.ServeHTTP(httptest.NewRecorder(), req)
if !strings.Contains(buf.String(), `"method":"POST"`) {
t.Fatalf("no log line for the request; got %q", buf.String())
}
if strings.Contains(buf.String(), signingKey) {
t.Errorf("log output contains the signing key; got %q", buf.String())
}
}
func TestSecurityHeaders(t *testing.T) {
t.Parallel()
@@ -76,6 +325,13 @@ func TestSecurityHeaders_PolicyHeaders(t *testing.T) {
handler.ServeHTTP(rec, req)
// The login and generator pages load their script and stylesheet from
// /static, so the policy allows no inline script or style.
csp := rec.Header().Get("Content-Security-Policy")
if strings.Contains(csp, "unsafe-inline") {
t.Errorf("Content-Security-Policy allows unsafe-inline: %q", csp)
}
tests := []struct {
header string
want string
@@ -84,8 +340,8 @@ func TestSecurityHeaders_PolicyHeaders(t *testing.T) {
{
"Content-Security-Policy",
"default-src 'self'; " +
"script-src 'self' 'unsafe-inline'; " +
"style-src 'self' 'unsafe-inline'; " +
"script-src 'self'; " +
"style-src 'self'; " +
"object-src 'none'; " +
"base-uri 'self'; " +
"form-action 'self'; " +
internal/middleware/request_id_internal_test.go
+118
View File
@@ -0,0 +1,118 @@
package middleware
import (
"log/slog"
"net/http"
"net/http/httptest"
"os"
"strings"
"testing"
"github.com/go-chi/chi/v5/middleware"
"sneak.berlin/go/pixa/internal/config"
)
// sendRequestID sends a request through the RequestID middleware, carrying
// incoming as its X-Request-Id unless that is empty. It returns the ID the
// next handler found in the request context, which the upstream fetch sends
// and the log lines carry, and the X-Request-Id of the response.
func sendRequestID(t *testing.T, incoming string) (string, string) {
t.Helper()
mw := &Middleware{log: slog.Default(), config: &config.Config{}}
var inContext string
handler := mw.RequestID()(http.HandlerFunc(
func(_ http.ResponseWriter, r *http.Request) {
inContext = middleware.GetReqID(r.Context())
}))
req := httptest.NewRequestWithContext(t.Context(), http.MethodGet, "/", nil)
if incoming != "" {
req.Header.Set("X-Request-Id", incoming)
}
rec := httptest.NewRecorder()
handler.ServeHTTP(rec, req)
return inContext, rec.Header().Get("X-Request-Id")
}
// TestRequestIDKeepsShortPlainID verifies that a request's own X-Request-Id of
// at most 64 letters, digits, '-', '_' or '.' is kept as its ID.
func TestRequestIDKeepsShortPlainID(t *testing.T) {
t.Parallel()
for _, incoming := range []string{
"client-request-id",
"A1_b2.c3-d4",
strings.Repeat("a", 64),
} {
inContext, inResponse := sendRequestID(t, incoming)
if inContext != incoming || inResponse != incoming {
t.Errorf("incoming %q: context has %q, response %q, want both %q",
incoming, inContext, inResponse, incoming)
}
}
}
// TestRequestIDReplacesLongOrUnusualID verifies that a request's own
// X-Request-Id that is over 64 characters or holds anything but letters,
// digits, '-', '_' or '.' is neither sent back nor sent upstream: the request
// gets a fresh ID instead.
func TestRequestIDReplacesLongOrUnusualID(t *testing.T) {
t.Parallel()
for _, incoming := range []string{
strings.Repeat("a", 65),
strings.Repeat("a", 9000),
"has space",
"a/b",
"a,b",
"<script>",
"ünicode",
} {
inContext, inResponse := sendRequestID(t, incoming)
t.Logf("incoming %.20q: made up %q", incoming, inResponse)
if inResponse == "" || inResponse == incoming {
t.Errorf("incoming %.20q: response has %q, want a fresh ID",
incoming, inResponse)
}
if inContext != inResponse {
t.Errorf("incoming %.20q: context has %q, want the response's %q",
incoming, inContext, inResponse)
}
}
}
// TestRequestIDMadeUpTellsNothing verifies that the ID made up for a request
// that sent none differs for every request and does not hold the host name.
func TestRequestIDMadeUpTellsNothing(t *testing.T) {
t.Parallel()
hostname, err := os.Hostname()
if err != nil {
t.Fatalf("os.Hostname() error = %v", err)
}
firstInContext, first := sendRequestID(t, "")
_, second := sendRequestID(t, "")
t.Logf("host %q, made up %q and %q", hostname, first, second)
if first == "" || first == second {
t.Errorf("made up %q and %q, want two different IDs", first, second)
}
if firstInContext != first {
t.Errorf("context has %q, want the response's %q", firstInContext, first)
}
if strings.Contains(first, hostname) {
t.Errorf("made-up ID %q holds the host name %q", first, hostname)
}
}
internal/server/cors_internal_test.go
+64
View File
@@ -0,0 +1,64 @@
package server
import (
"net/http"
"net/http/httptest"
"testing"
)
// TestCORSOnlyOnImageRoutes verifies that the image routes answer with the
// configured access_control_allow_origin, a preflight request included, and
// that the login and URL generator pages send no Access-Control-Allow-Origin,
// so no other site can read them. /metrics is left out: its middleware
// registers with the process-wide Prometheus registry, which only one test
// in this package can do.
func TestCORSOnlyOnImageRoutes(t *testing.T) {
t.Parallel()
const appOrigin = "https://app.example.com"
s := newTestServer(t)
s.config.AccessControlAllowOrigin = appOrigin
s.SetupRoutes()
requests := []struct {
method string
path string
want string
}{
{http.MethodGet, unsignedImagePath, appOrigin},
{http.MethodHead, unsignedImagePath, appOrigin},
{http.MethodOptions, unsignedImagePath, appOrigin},
{http.MethodGet, encryptedImagePath, appOrigin},
{http.MethodGet, "/", ""},
{http.MethodOptions, "/", ""},
{http.MethodPost, "/generate", ""},
{http.MethodGet, "/logout", ""},
}
for _, tc := range requests {
t.Run(tc.method+" "+tc.path, func(t *testing.T) {
t.Parallel()
req := httptest.NewRequestWithContext(
t.Context(), tc.method, tc.path, nil)
req.Header.Set("Origin", appOrigin)
// An OPTIONS request naming the method it asks about is the
// preflight a browser sends before some cross-origin requests.
if tc.method == http.MethodOptions {
req.Header.Set("Access-Control-Request-Method", http.MethodGet)
}
rec := httptest.NewRecorder()
s.ServeHTTP(rec, req)
t.Logf("status %d", rec.Code)
got := rec.Header().Get("Access-Control-Allow-Origin")
if got != tc.want {
t.Errorf("Access-Control-Allow-Origin = %q, want %q",
got, tc.want)
}
})
}
}
internal/server/http.go
+9 -8
View File
@@ -5,6 +5,8 @@ import (
"fmt"
"net/http"
"time"
"go.uber.org/fx"
)
// HTTP server configuration constants.
@@ -14,7 +16,6 @@ const (
// short, so a slowloris client dribbling headers is dropped well
// before it ties up a connection for the whole ReadTimeout window.
HTTPReadHeaderTimeout = 10 * time.Second
HTTPWriteTimeout = 60 * time.Second
// HTTPIdleTimeout bounds how long an idle keep-alive connection is
// held open, so idle connections cannot accumulate without limit on a
// service targeting high concurrency.
@@ -30,26 +31,26 @@ func (s *Server) newHTTPServer() *http.Server {
Addr: fmt.Sprintf(":%d", s.config.Port),
ReadTimeout: HTTPReadTimeout,
ReadHeaderTimeout: HTTPReadHeaderTimeout,
WriteTimeout: HTTPWriteTimeout,
WriteTimeout: s.config.DownstreamTimeout,
IdleTimeout: HTTPIdleTimeout,
MaxHeaderBytes: HTTPMaxHeaderBytes,
Handler: s,
}
}
// serveUntilShutdown serves on s.httpServer until it is shut down. When it
// stops for any other reason, such as its port being in use, it asks fx to
// shut down with exit code 1.
func (s *Server) serveUntilShutdown() {
s.httpServer = s.newHTTPServer()
s.SetupRoutes()
s.log.Info("http begin listen", "listenaddr", s.httpServer.Addr)
err := s.httpServer.ListenAndServe()
if err != nil && !errors.Is(err, http.ErrServerClosed) {
s.log.Error("listen error", "error", err)
if s.cancelFunc != nil {
s.cancelFunc()
err = s.shutdowner.Shutdown(fx.ExitCode(1))
if err != nil {
s.log.Error("shutdown request failed", "error", err)
}
}
}
internal/server/http_internal_test.go
+7 -3
View File
@@ -11,11 +11,15 @@ import (
// carries every hardening timeout wired onto it, including the slowloris
// defense (ReadHeaderTimeout) and the keep-alive bound (IdleTimeout). This
// guards against a field being defined but never set on the server, so
// each assertion compares the server field to its constant.
// each assertion compares the server field to its constant, or, for
// WriteTimeout, to downstream_timeout from the config.
func TestNewHTTPServerTimeouts(t *testing.T) {
t.Parallel()
s := &Server{config: &config.Config{Port: 8080}}
s := &Server{config: &config.Config{
Port: 8080,
DownstreamTimeout: 45 * time.Second,
}}
srv := s.newHTTPServer()
@@ -26,7 +30,7 @@ func TestNewHTTPServerTimeouts(t *testing.T) {
}{
{"ReadTimeout", srv.ReadTimeout, HTTPReadTimeout},
{"ReadHeaderTimeout", srv.ReadHeaderTimeout, HTTPReadHeaderTimeout},
{"WriteTimeout", srv.WriteTimeout, HTTPWriteTimeout},
{"WriteTimeout", srv.WriteTimeout, 45 * time.Second},
{"IdleTimeout", srv.IdleTimeout, HTTPIdleTimeout},
}
internal/server/image_proxy_internal_test.go
+302
View File
@@ -0,0 +1,302 @@
package server
import (
"bytes"
"context"
"crypto/sha256"
"database/sql"
"encoding/hex"
"image"
"image/color"
"image/jpeg"
"image/png"
"io"
"net"
"net/http"
"net/http/httptest"
"os"
"path/filepath"
"sync/atomic"
"testing"
"go.uber.org/fx"
"go.uber.org/fx/fxtest"
"sneak.berlin/go/pixa/internal/config"
"sneak.berlin/go/pixa/internal/database"
"sneak.berlin/go/pixa/internal/globals"
"sneak.berlin/go/pixa/internal/handlers"
"sneak.berlin/go/pixa/internal/healthcheck"
"sneak.berlin/go/pixa/internal/httpfetcher"
"sneak.berlin/go/pixa/internal/logger"
"sneak.berlin/go/pixa/internal/middleware"
)
// upstreamHost is the upstream host of the image URLs below. It is a
// documentation address (RFC 5737), which the fetcher's URL check accepts as
// public; the fetcher's dial function connects it to the test upstream server.
const upstreamHost = "192.0.2.10"
// TestImageProxyFlow requests images through pixa's router, handlers,
// upstream fetcher, image processor, disk cache and database, with only the
// upstream origin replaced by a local test server. The first request for a URL
// is fetched and converted; the second is served from the cache without
// another upstream request. The source and the converted image are then on
// disk, with their rows in the database.
func TestImageProxyFlow(t *testing.T) {
t.Parallel()
source := encodeTestPNG(t, 64, 48)
tests := []struct {
name string
sizeFormat string // the <size>.<format> part of the image URL
contentType string
decodeConfig func(io.Reader) (image.Config, error)
width, height int
}{
{"resize and convert to JPEG", "32x24.jpeg", "image/jpeg",
jpeg.DecodeConfig, 32, 24},
{"orig", "orig.orig", "image/png", png.DecodeConfig, 64, 48},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
t.Parallel()
var upstreamRequests atomic.Int32
upstream := httptest.NewServer(http.HandlerFunc(
func(w http.ResponseWriter, _ *http.Request) {
upstreamRequests.Add(1)
w.Header().Set("Content-Type", "image/png")
_, _ = w.Write(source)
}))
t.Cleanup(upstream.Close)
s, db, stateDir := startImageProxy(t, upstream)
target := "/v1/image/" + upstreamHost + "/photo.png/" + tt.sizeFormat
first := getImage(t, s, target)
if got := first.Header().Get("X-Pixa-Cache"); got != "MISS" {
t.Errorf("first X-Pixa-Cache = %q, want MISS", got)
}
if got := first.Header().Get("Content-Type"); got != tt.contentType {
t.Errorf("Content-Type = %q, want %q", got, tt.contentType)
}
decoded, err := tt.decodeConfig(bytes.NewReader(first.Body.Bytes()))
if err != nil {
t.Fatalf("decoding the image: %v", err)
}
if decoded.Width != tt.width || decoded.Height != tt.height {
t.Errorf("image is %dx%d, want %dx%d",
decoded.Width, decoded.Height, tt.width, tt.height)
}
second := getImage(t, s, target)
if got := second.Header().Get("X-Pixa-Cache"); got != "HIT" {
t.Errorf("second X-Pixa-Cache = %q, want HIT", got)
}
if !bytes.Equal(second.Body.Bytes(), first.Body.Bytes()) {
t.Error("the second response is not the image the first served")
}
if got := upstreamRequests.Load(); got != 1 {
t.Errorf("upstream received %d requests, want 1", got)
}
checkSourceCached(t, db, stateDir, source)
checkVariantCached(t, db, stateDir, first.Body.Bytes(), tt.contentType)
})
}
}
// startImageProxy starts the components pixad's fx app builds, from a config
// with a fresh state directory and upstreamHost on the allowlist, and with an
// upstream fetcher that connects every upstream address to upstream. It
// returns the server with its routes, the database and the state directory.
func startImageProxy(
t *testing.T, upstream *httptest.Server,
) (*Server, *sql.DB, string) {
t.Helper()
stateDir := t.TempDir()
cfg := &config.Config{
SigningKey: testSigningKey,
StateDir: stateDir,
DBURL: "file:" + filepath.Join(stateDir, "state.sqlite3"),
AllowlistHosts: []string{upstreamHost},
// The test upstream server has no TLS.
AllowHTTP: true,
// A limit of its own, so the cache does not size itself from the
// host's free disk space.
CacheMaxBytes: 64 << 20,
CacheMaxBytesExplicit: true,
UpstreamMaxResponseSize: config.DefaultUpstreamMaxResponseSize,
DownstreamTimeout: config.DefaultDownstreamTimeout,
}
fetcherCfg := httpfetcher.DefaultConfig()
fetcherCfg.AllowHTTP = true
fetcherCfg.DialContext = func(
ctx context.Context, network, _ string,
) (net.Conn, error) {
var dialer net.Dialer
return dialer.DialContext(ctx, network, upstream.Listener.Addr().String())
}
fetcher := httpfetcher.New(fetcherCfg)
var (
h *handlers.Handlers
mw *middleware.Middleware
db *database.Database
)
app := fxtest.New(t,
fx.Supply(cfg),
fx.Provide(
globals.New,
logger.New,
database.New,
healthcheck.New,
handlers.New,
middleware.New,
func() httpfetcher.Fetcher { return fetcher },
),
fx.Populate(&h, &mw, &db),
)
app.RequireStart()
t.Cleanup(app.RequireStop)
// Requests go straight to the router, as in newTestServer; the server's
// own start hook, which listens on a port, is left out.
s := &Server{config: cfg, mw: mw, h: h}
s.SetupRoutes()
return s, db.DB(), stateDir
}
// getImage sends a GET for target to s and fails unless it answers 200.
func getImage(t *testing.T, s *Server, target string) *httptest.ResponseRecorder {
t.Helper()
rec := httptest.NewRecorder()
s.ServeHTTP(rec, httptest.NewRequestWithContext(
t.Context(), http.MethodGet, target, nil))
t.Logf("GET %s: %d, X-Pixa-Cache %s",
target, rec.Code, rec.Header().Get("X-Pixa-Cache"))
if rec.Code != http.StatusOK {
t.Fatalf("GET %s status = %d, want %d; body %s",
target, rec.Code, http.StatusOK, rec.Body.String())
}
return rec
}
// checkSourceCached checks that source is stored under its SHA-256 in
// cache/sources, recorded in source_content, and that the source URL's row in
// source_metadata points at it.
func checkSourceCached(t *testing.T, db *sql.DB, stateDir string, source []byte) {
t.Helper()
sum := sha256.Sum256(source)
hash := hex.EncodeToString(sum[:])
checkFile(t, filepath.Join(stateDir, "cache", "sources", hash[0:2], hash[2:4], hash),
source)
var rows int
err := db.QueryRowContext(t.Context(),
"SELECT COUNT(*) FROM source_content WHERE content_hash = ?", hash,
).Scan(&rows)
if err != nil || rows != 1 {
t.Errorf("source_content rows for the source = %d (error %v), want 1",
rows, err)
}
var metadataHash string
err = db.QueryRowContext(t.Context(),
`SELECT content_hash FROM source_metadata
WHERE source_host = ? AND source_path = ?`,
upstreamHost, "/photo.png",
).Scan(&metadataHash)
if err != nil || metadataHash != hash {
t.Errorf("source_metadata content_hash = %q (error %v), want %q",
metadataHash, err, hash)
}
}
// checkVariantCached checks that the converted image served is recorded in
// variant_content with contentType, and stored under its cache key in
// cache/variants.
func checkVariantCached(
t *testing.T, db *sql.DB, stateDir string, served []byte, contentType string,
) {
t.Helper()
var cacheKey, storedType string
err := db.QueryRowContext(t.Context(),
"SELECT cache_key, content_type FROM variant_content",
).Scan(&cacheKey, &storedType)
if err != nil {
t.Fatalf("variant_content row: %v", err)
}
if storedType != contentType {
t.Errorf("variant_content content_type = %q, want %q",
storedType, contentType)
}
checkFile(t, filepath.Join(stateDir, "cache", "variants",
cacheKey[0:2], cacheKey[2:4], cacheKey), served)
}
// checkFile checks that the file at path holds want.
func checkFile(t *testing.T, path string, want []byte) {
t.Helper()
//nolint:gosec // G304: a path under the test's state directory
got, err := os.ReadFile(path)
if err != nil {
t.Errorf("reading %s: %v", path, err)
return
}
if !bytes.Equal(got, want) {
t.Errorf("%s holds %d bytes that are not the %d expected",
path, len(got), len(want))
}
}
// encodeTestPNG returns an opaque width x height PNG of one color.
func encodeTestPNG(t *testing.T, width, height int) []byte {
t.Helper()
img := image.NewRGBA(image.Rect(0, 0, width, height))
for y := range height {
for x := range width {
img.Set(x, y, color.RGBA{R: 200, G: 40, B: 40, A: 255})
}
}
var buf bytes.Buffer
err := png.Encode(&buf, img)
if err != nil {
t.Fatalf("encoding the test PNG: %v", err)
}
return buf.Bytes()
}
internal/server/login_rate_limit_internal_test.go
+15 -6
View File
@@ -18,6 +18,7 @@ import (
"sneak.berlin/go/pixa/internal/database"
"sneak.berlin/go/pixa/internal/globals"
"sneak.berlin/go/pixa/internal/handlers"
"sneak.berlin/go/pixa/internal/healthcheck"
"sneak.berlin/go/pixa/internal/logger"
"sneak.berlin/go/pixa/internal/middleware"
)
@@ -51,11 +52,12 @@ func newTestServer(t *testing.T) *Server {
stateDir := t.TempDir()
cfg := &config.Config{
Debug: true,
SigningKey: testSigningKey,
StateDir: stateDir,
DBURL: "file:" + filepath.Join(stateDir, "state.sqlite3"),
TrustedProxies: []netip.Prefix{netip.MustParsePrefix("10.0.0.0/8")},
Debug: true,
SigningKey: testSigningKey,
StateDir: stateDir,
DBURL: "file:" + filepath.Join(stateDir, "state.sqlite3"),
TrustedProxies: []netip.Prefix{netip.MustParsePrefix("10.0.0.0/8")},
DownstreamTimeout: config.DefaultDownstreamTimeout,
}
lc := fxtest.NewLifecycle(t)
@@ -70,8 +72,15 @@ func newTestServer(t *testing.T) *Server {
t.Fatalf("database.New() error = %v", err)
}
hc, err := healthcheck.New(lc, healthcheck.Params{
Globals: &globals.Globals{}, Config: cfg, Logger: log, Database: db,
})
if err != nil {
t.Fatalf("healthcheck.New() error = %v", err)
}
h, err := handlers.New(lc, handlers.Params{
Logger: log, Database: db, Config: cfg,
Logger: log, Healthcheck: hc, Database: db, Config: cfg,
})
if err != nil {
t.Fatalf("handlers.New() error = %v", err)
internal/server/maintenance_internal_test.go
+173
View File
@@ -0,0 +1,173 @@
package server
import (
"encoding/json"
"net/http"
"net/http/httptest"
"strconv"
"testing"
"sneak.berlin/go/pixa/internal/healthcheck"
)
// unsignedImagePath is an image URL that carries no signature.
const unsignedImagePath = "/v1/image/cdn.example.com/cat.jpg/100x100.jpeg"
// encryptedImagePath is an encrypted image URL whose token cannot be
// decrypted.
const encryptedImagePath = "/v1/e/token/cat.jpg"
// TestMaintenanceModeRefusesImageRequests verifies that while maintenance
// mode is on, both image routes answer 503 Service Unavailable with a
// Retry-After header and the JSON error body the image handlers send.
func TestMaintenanceModeRefusesImageRequests(t *testing.T) {
t.Parallel()
s := newTestServer(t)
s.config.MaintenanceMode = true
requests := []struct {
method string
path string
}{
{http.MethodGet, unsignedImagePath},
{http.MethodHead, unsignedImagePath},
{http.MethodGet, encryptedImagePath},
}
for _, tc := range requests {
t.Run(tc.method+" "+tc.path, func(t *testing.T) {
t.Parallel()
rec := httptest.NewRecorder()
s.ServeHTTP(rec, httptest.NewRequestWithContext(
t.Context(), tc.method, tc.path, nil))
t.Logf("status %d, body %s", rec.Code, rec.Body.String())
if rec.Code != http.StatusServiceUnavailable {
t.Fatalf("status = %d, want %d",
rec.Code, http.StatusServiceUnavailable)
}
retryAfter := rec.Header().Get("Retry-After")
seconds, err := strconv.Atoi(retryAfter)
if err != nil || seconds <= 0 {
t.Errorf("Retry-After = %q, want a positive number of seconds",
retryAfter)
}
// A HEAD response carries no body.
if tc.method == http.MethodHead {
return
}
var body struct {
Error string `json:"error"`
Status int `json:"status"`
Timestamp string `json:"timestamp"`
}
err = json.NewDecoder(rec.Body).Decode(&body)
if err != nil {
t.Fatalf("body is not JSON: %v", err)
}
if body.Error == "" || body.Status != http.StatusServiceUnavailable ||
body.Timestamp == "" {
t.Errorf("body = %+v, want an error, status %d and a timestamp",
body, http.StatusServiceUnavailable)
}
})
}
}
// TestImageRequestsServedWithoutMaintenanceMode verifies that while
// maintenance mode is off, image requests reach the image handlers instead
// of the 503. The handlers refuse an unsigned image URL with 401 and a token
// they cannot decrypt with 400, so either status shows a request got through.
func TestImageRequestsServedWithoutMaintenanceMode(t *testing.T) {
t.Parallel()
s := newTestServer(t)
s.config.MaintenanceMode = false
requests := []struct {
method string
path string
want int
}{
{http.MethodGet, unsignedImagePath, http.StatusUnauthorized},
{http.MethodHead, unsignedImagePath, http.StatusUnauthorized},
{http.MethodGet, encryptedImagePath, http.StatusBadRequest},
}
for _, tc := range requests {
t.Run(tc.method+" "+tc.path, func(t *testing.T) {
t.Parallel()
rec := httptest.NewRecorder()
s.ServeHTTP(rec, httptest.NewRequestWithContext(
t.Context(), tc.method, tc.path, nil))
t.Logf("status %d, body %s", rec.Code, rec.Body.String())
if rec.Code != tc.want {
t.Errorf("status = %d, want %d from the image handler",
rec.Code, tc.want)
}
})
}
}
// TestMaintenanceModeKeepsOtherRoutes verifies that while maintenance mode
// is on, the health check still answers 200 and reports it, and the login
// page and /metrics still answer 200. The image's Docker HEALTHCHECK
// requests the health check: a 503 there would make the container
// unhealthy, and upaas marks a deploy failed when its container is
// unhealthy.
func TestMaintenanceModeKeepsOtherRoutes(t *testing.T) {
t.Parallel()
s := newTestServer(t)
s.config.MaintenanceMode = true
// /metrics is routed only when its username is set.
s.config.MetricsUsername = "metrics"
s.config.MetricsPassword = "metrics-password"
s.SetupRoutes()
rec := httptest.NewRecorder()
s.ServeHTTP(rec, httptest.NewRequestWithContext(t.Context(),
http.MethodGet, "/.well-known/healthcheck.json", nil))
t.Logf("health check status %d, body %s", rec.Code, rec.Body.String())
if rec.Code != http.StatusOK {
t.Fatalf("health check status = %d, want %d", rec.Code, http.StatusOK)
}
var health healthcheck.Response
err := json.NewDecoder(rec.Body).Decode(&health)
if err != nil || !health.Maintenance {
t.Errorf("health check maintenance_mode = %v (error %v), want true",
health.Maintenance, err)
}
rec = httptest.NewRecorder()
s.ServeHTTP(rec, clientRequest(t, http.MethodGet, nil, firstClient, ""))
if rec.Code != http.StatusOK {
t.Errorf("login page status = %d, want %d", rec.Code, http.StatusOK)
}
req := httptest.NewRequestWithContext(t.Context(),
http.MethodGet, "/metrics", nil)
req.SetBasicAuth(s.config.MetricsUsername, s.config.MetricsPassword)
rec = httptest.NewRecorder()
s.ServeHTTP(rec, req)
if rec.Code != http.StatusOK {
t.Errorf("/metrics status = %d, want %d", rec.Code, http.StatusOK)
}
}
internal/server/metrics_internal_test.go
+32
View File
@@ -0,0 +1,32 @@
package server
import (
"net/http"
"net/http/httptest"
"strings"
"testing"
"github.com/prometheus/client_golang/prometheus/promhttp"
)
// TestNoMetricsRecordedWithoutMetricsUsername checks that with no metrics
// username set the router records nothing about the requests it serves.
// /metrics is not served then, so the process-wide Prometheus registry is
// read directly. TestMaintenanceModeKeepsOtherRoutes records into the same
// registry, but never a GET /robots.txt.
func TestNoMetricsRecordedWithoutMetricsUsername(t *testing.T) {
t.Parallel()
s := newTestServer(t)
s.ServeHTTP(httptest.NewRecorder(), httptest.NewRequestWithContext(
t.Context(), http.MethodGet, "/robots.txt", nil))
rec := httptest.NewRecorder()
promhttp.Handler().ServeHTTP(rec, httptest.NewRequestWithContext(
t.Context(), http.MethodGet, "/metrics", nil))
if strings.Contains(rec.Body.String(), `handler="/robots.txt"`) {
t.Errorf("with no metrics username GET /robots.txt was recorded:\n%s",
rec.Body.String())
}
}
internal/server/request_id_internal_test.go
+58
View File
@@ -0,0 +1,58 @@
package server
import (
"net/http"
"net/http/httptest"
"testing"
)
// requestIDHeader is the header that carries a request's ID.
const requestIDHeader = "X-Request-Id"
// TestResponsesCarryRequestID verifies that every response, whatever its route
// and status, carries the request's ID as X-Request-Id, so a client can quote
// it when reporting a problem: one pixa made up when the request brought none,
// and the request's own X-Request-Id when it brought one.
func TestResponsesCarryRequestID(t *testing.T) {
t.Parallel()
const clientRequestID = "client-request-id"
s := newTestServer(t)
paths := []string{
"/robots.txt",
"/no-such-path",
unsignedImagePath,
encryptedImagePath,
}
for _, path := range paths {
t.Run(path, func(t *testing.T) {
t.Parallel()
rec := httptest.NewRecorder()
s.ServeHTTP(rec, httptest.NewRequestWithContext(
t.Context(), http.MethodGet, path, nil))
t.Logf("status %d, %s %q",
rec.Code, requestIDHeader, rec.Header().Get(requestIDHeader))
if rec.Header().Get(requestIDHeader) == "" {
t.Errorf("response has no %s", requestIDHeader)
}
req := httptest.NewRequestWithContext(
t.Context(), http.MethodGet, path, nil)
req.Header.Set(requestIDHeader, clientRequestID)
rec = httptest.NewRecorder()
s.ServeHTTP(rec, req)
got := rec.Header().Get(requestIDHeader)
if got != clientRequestID {
t.Errorf("%s = %q, want the request's own %q",
requestIDHeader, got, clientRequestID)
}
})
}
}
internal/server/routes.go
+62 -12
View File
@@ -1,7 +1,9 @@
package server
import (
"encoding/json"
"net/http"
"strconv"
"time"
sentryhttp "github.com/getsentry/sentry-go/http"
@@ -17,12 +19,16 @@ import (
// make per minute; the next is refused with 429 Too Many Requests.
const LoginAttemptsPerMinute = 5
// MaintenanceRetryAfterSeconds is the Retry-After, in seconds, sent with
// the 503 that the image routes answer while maintenance mode is on.
const MaintenanceRetryAfterSeconds = 300
// SetupRoutes configures all HTTP routes.
func (s *Server) SetupRoutes() {
s.router = chi.NewRouter()
s.router.Use(middleware.Recoverer)
s.router.Use(middleware.RequestID)
s.router.Use(s.mw.RequestID())
s.router.Use(s.mw.ClientIP())
s.router.Use(s.mw.SecurityHeaders())
s.router.Use(s.mw.Logging())
@@ -32,8 +38,7 @@ func (s *Server) SetupRoutes() {
s.router.Use(s.mw.Metrics())
}
s.router.Use(s.mw.CORS())
s.router.Use(middleware.Timeout(HTTPWriteTimeout))
s.router.Use(middleware.Timeout(s.config.DownstreamTimeout))
if s.sentryEnabled {
sentryHandler := sentryhttp.New(sentryhttp.Options{
@@ -48,7 +53,7 @@ func (s *Server) SetupRoutes() {
// Robots.txt
s.router.Get("/robots.txt", s.h.HandleRobotsTxt())
// Static files (Tailwind CSS, etc.)
// The login and generator pages' stylesheet and script
s.router.Handle("/static/*", http.StripPrefix("/static/", static.Handler()))
// Login/generator UI. The form routes carry CSRF protection; the
@@ -68,15 +73,33 @@ func (s *Server) SetupRoutes() {
s.router.Get("/logout", s.h.HandleLogout())
// Main image proxy route
// /v1/image/<host>/<path>/<width>x<height>.<format>
s.router.Get("/v1/image/*", s.h.HandleImage())
s.router.Head("/v1/image/*", s.h.HandleImage())
// Image routes, the only ones that send CORS headers, as pages on other
// sites read them. They are a subrouter rather than a group: a group's
// middleware runs only for a request that matches one of its routes,
// and a browser's preflight OPTIONS request matches none, so the CORS
// middleware could not answer it.
s.router.Route("/v1", func(r chi.Router) {
r.Use(s.mw.CORS())
// Encrypted image URL route
// The trailing filename (e.g., /img.jpg) is ignored but helps
// browsers with content type
s.router.Get("/v1/e/{token}/*", s.h.HandleImageEnc())
// Refused while maintenance mode is on. Only these: the image's
// Docker HEALTHCHECK requests the health check, a 503 there would
// make the container unhealthy, and upaas marks a deploy failed
// when its container is unhealthy.
r.Group(func(r chi.Router) {
r.Use(s.refuseDuringMaintenance)
// Main image proxy route
// /v1/image/<host>/<path>/<width>x<height>.<format>
r.Get("/image/*", s.h.HandleImage())
r.Head("/image/*", s.h.HandleImage())
// Encrypted image URL route
// The trailing filename (e.g., /img.jpg) is ignored but helps
// browsers with content type
r.Get("/e/{token}/*", s.h.HandleImageEnc())
r.Head("/e/{token}/*", s.h.HandleImageEnc())
})
})
// Metrics endpoint with auth
if s.config.MetricsUsername != "" {
@@ -86,3 +109,30 @@ func (s *Server) SetupRoutes() {
})
}
}
// refuseDuringMaintenance answers a request with 503 Service Unavailable,
// a Retry-After header and a JSON error body while maintenance mode is on,
// and passes it on otherwise. The body has the fields of the JSON errors
// the image handlers send.
func (s *Server) refuseDuringMaintenance(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if !s.MaintenanceMode() {
next.ServeHTTP(w, r)
return
}
w.Header().Set("Retry-After", strconv.Itoa(MaintenanceRetryAfterSeconds))
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(http.StatusServiceUnavailable)
err := json.NewEncoder(w).Encode(map[string]any{
"error": "down for maintenance, try again later",
"status": http.StatusServiceUnavailable,
"timestamp": time.Now().UTC().Format(time.RFC3339),
})
if err != nil {
s.log.Error("json encode error", "error", err)
}
})
}
internal/server/routes_internal_test.go
+27
View File
@@ -0,0 +1,27 @@
package server
import (
"net/http"
"net/http/httptest"
"testing"
)
// TestEncryptedImageRouteAnswersHEAD verifies that HEAD on the encrypted image
// route reaches its handler, as GET does, instead of being answered 405 Method
// Not Allowed. The handler refuses a token it cannot decrypt with 400, so that
// status shows the request got through.
func TestEncryptedImageRouteAnswersHEAD(t *testing.T) {
t.Parallel()
s := newTestServer(t)
rec := httptest.NewRecorder()
s.ServeHTTP(rec, httptest.NewRequestWithContext(
t.Context(), http.MethodHead, encryptedImagePath, nil))
t.Logf("status %d", rec.Code)
if rec.Code != http.StatusBadRequest {
t.Errorf("status = %d, want %d from the encrypted image handler",
rec.Code, http.StatusBadRequest)
}
}
internal/server/server.go
+52 -63
View File
@@ -3,12 +3,10 @@ package server
import (
"context"
"errors"
"fmt"
"log/slog"
"net/http"
"os"
"os/signal"
"syscall"
"time"
"github.com/getsentry/sentry-go"
@@ -27,6 +25,10 @@ const (
SentryFlushTimeout = 2 * time.Second
)
// errStillProcessing is returned by the server's stop hook when images are
// still being processed once ShutdownTimeout has passed.
var errStillProcessing = errors.New("images still being processed at shutdown")
// Params defines dependencies for Server.
type Params struct {
fx.In
@@ -36,6 +38,7 @@ type Params struct {
Config *config.Config
Middleware *middleware.Middleware
Handlers *handlers.Handlers
Shutdowner fx.Shutdowner
}
// Server is the main HTTP server.
@@ -45,59 +48,58 @@ type Server struct {
globals *globals.Globals
mw *middleware.Middleware
h *handlers.Handlers
shutdowner fx.Shutdowner
startupTime time.Time
exitCode int
sentryEnabled bool
cancelFunc context.CancelFunc
httpServer *http.Server
router *chi.Mux
}
// New creates a new Server instance.
// New creates a new Server instance. Its start hook starts Sentry and the
// HTTP server; its stop hook, which fx runs on SIGINT, SIGTERM or a
// shutdown request, shuts them down.
func New(lc fx.Lifecycle, params Params) (*Server, error) {
s := &Server{
log: params.Logger.Get(),
config: params.Config,
globals: params.Globals,
mw: params.Middleware,
h: params.Handlers,
log: params.Logger.Get(),
config: params.Config,
globals: params.Globals,
mw: params.Middleware,
h: params.Handlers,
shutdowner: params.Shutdowner,
}
lc.Append(fx.Hook{
OnStart: func(ctx context.Context) error {
OnStart: func(_ context.Context) error {
s.startupTime = time.Now()
go s.Run(context.WithoutCancel(ctx))
return nil
},
OnStop: func(_ context.Context) error {
if s.cancelFunc != nil {
s.cancelFunc()
err := s.enableSentry()
if err != nil {
return err
}
s.SetupRoutes()
s.httpServer = s.newHTTPServer()
go s.serveUntilShutdown()
return nil
},
OnStop: s.cleanShutdown,
})
return s, nil
}
// Run starts the server.
func (s *Server) Run(ctx context.Context) {
s.enableSentry()
s.serve(ctx)
}
// MaintenanceMode returns whether maintenance mode is enabled.
func (s *Server) MaintenanceMode() bool {
return s.config.MaintenanceMode
}
func (s *Server) enableSentry() {
func (s *Server) enableSentry() error {
s.sentryEnabled = false
if s.config.SentryDSN == "" {
return
return nil
}
err := sentry.Init(sentry.ClientOptions{
@@ -105,55 +107,42 @@ func (s *Server) enableSentry() {
Release: fmt.Sprintf("%s-%s", s.globals.Appname, s.globals.Version),
})
if err != nil {
s.log.Error("sentry init failure", "error", err)
os.Exit(1)
return fmt.Errorf("sentry init failure: %w", err)
}
s.log.Info("sentry error reporting activated")
s.sentryEnabled = true
return nil
}
func (s *Server) serve(ctx context.Context) int {
ctx, cancelFunc := context.WithCancel(ctx)
s.cancelFunc = cancelFunc
// cleanShutdown stops the HTTP server, waits for the images still being
// processed, then flushes Sentry. The first two share ShutdownTimeout. It
// returns errStillProcessing when images are still being processed after
// that, as their work is abandoned.
func (s *Server) cleanShutdown(ctx context.Context) error {
s.log.Info("shutting down")
go func() {
c := make(chan os.Signal, 1)
signal.Ignore(syscall.SIGPIPE)
signal.Notify(c, os.Interrupt, syscall.SIGTERM)
sig := <-c
s.log.Info("signal received", "signal", sig)
if s.cancelFunc != nil {
s.cancelFunc()
}
}()
go s.serveUntilShutdown()
<-ctx.Done()
s.cleanShutdown(ctx)
return s.exitCode
}
func (s *Server) cleanShutdown(ctx context.Context) {
s.exitCode = 0
ctxShutdown, shutdownCancel := context.WithTimeout(
context.WithoutCancel(ctx), ShutdownTimeout)
ctxShutdown, shutdownCancel := context.WithTimeout(ctx, ShutdownTimeout)
defer shutdownCancel()
if s.httpServer != nil {
err := s.httpServer.Shutdown(ctxShutdown)
if err != nil {
s.log.Error("server clean shutdown failed", "error", err)
}
err := s.httpServer.Shutdown(ctxShutdown)
if err != nil {
s.log.Error("server clean shutdown failed", "error", err)
}
stillProcessing := s.h.WaitForProcessing(ctxShutdown)
if s.sentryEnabled {
sentry.Flush(SentryFlushTimeout)
}
if stillProcessing > 0 {
s.log.Error("images still being processed at shutdown",
"count", stillProcessing)
return errStillProcessing
}
return nil
}
internal/server/shutdown_internal_test.go
+96
View File
@@ -0,0 +1,96 @@
package server
import (
"log/slog"
"net"
"testing"
"time"
"go.uber.org/fx"
"go.uber.org/fx/fxtest"
"sneak.berlin/go/pixa/internal/config"
"sneak.berlin/go/pixa/internal/globals"
"sneak.berlin/go/pixa/internal/logger"
)
// shutdownRecorder is an fx.Shutdowner that sends the options of each
// shutdown request on requests.
type shutdownRecorder struct {
requests chan []fx.ShutdownOption
}
func (r shutdownRecorder) Shutdown(opts ...fx.ShutdownOption) error {
r.requests <- opts
return nil
}
// TestSentryInitFailureFailsStartup checks that a Sentry DSN that cannot be
// used makes the server's start hook fail, so fx stops what has already
// started, instead of the process exiting from a goroutine.
func TestSentryInitFailureFailsStartup(t *testing.T) {
t.Parallel()
lc := fxtest.NewLifecycle(t)
log, err := logger.New(lc, logger.Params{Globals: &globals.Globals{}})
if err != nil {
t.Fatalf("logger.New() error = %v", err)
}
_, err = New(lc, Params{
Logger: log,
Globals: &globals.Globals{Appname: "pixad"},
Config: &config.Config{SentryDSN: "not-a-dsn"},
})
if err != nil {
t.Fatalf("New() error = %v", err)
}
err = lc.Start(t.Context())
t.Logf("Start() error = %v", err)
if err == nil {
t.Fatal("Start() error = nil, want the Sentry initialization error")
}
}
// TestListenErrorRequestsShutdownWithExitCode1 occupies the server's port
// and checks that the listen error asks fx to shut down with exit code 1.
func TestListenErrorRequestsShutdownWithExitCode1(t *testing.T) {
t.Parallel()
busy, err := (&net.ListenConfig{}).Listen(t.Context(), "tcp", ":0")
if err != nil {
t.Fatalf("Listen() error = %v", err)
}
t.Cleanup(func() { _ = busy.Close() })
addr, ok := busy.Addr().(*net.TCPAddr)
if !ok {
t.Fatalf("listener address %v is not a TCP address", busy.Addr())
}
requests := make(chan []fx.ShutdownOption, 1)
s := &Server{
log: slog.New(slog.DiscardHandler),
config: &config.Config{Port: addr.Port},
shutdowner: shutdownRecorder{requests: requests},
}
s.httpServer = s.newHTTPServer()
go s.serveUntilShutdown()
select {
case opts := <-requests:
t.Logf("shutdown options = %v", opts)
if len(opts) != 1 || opts[0] != fx.ExitCode(1) {
t.Errorf("shutdown options = %v, want [fx.ExitCode(1)]", opts)
}
case <-time.After(5 * time.Second):
t.Fatal("no shutdown was requested after the listen error")
}
}
internal/static/generator.js
+10
View File
@@ -0,0 +1,10 @@
// Generator page: a click on the generated URL selects it, and the Copy
// button copies it. Both are on the page only once a URL has been generated.
const generatedURL = document.getElementById("generated-url");
if (generatedURL) {
generatedURL.addEventListener("click", () => generatedURL.select());
document.getElementById("copy-url").addEventListener("click", () => {
navigator.clipboard.writeText(generatedURL.value);
});
}
internal/static/static.go
+1 -1
View File
@@ -7,7 +7,7 @@ import (
"net/http"
)
//go:embed *.js
//go:embed *.css *.js
var files embed.FS
// FS returns the embedded filesystem containing static files.
internal/static/style.css
+190
View File
@@ -0,0 +1,190 @@
/* The login and generator pages. */
* {
box-sizing: border-box;
}
body {
margin: 0;
min-height: 100vh;
background: #f3f4f6;
font-family: system-ui, sans-serif;
line-height: 1.5;
}
h1 {
margin: 0;
font-size: 1.5rem;
line-height: 2rem;
font-weight: 700;
color: #1f2937;
}
label {
display: block;
margin-bottom: 0.25rem;
font-size: 0.875rem;
font-weight: 500;
color: #374151;
}
input,
select {
width: 100%;
padding: 0.5rem 0.75rem;
border: 1px solid #d1d5db;
border-radius: 0.375rem;
box-shadow: 0 1px 2px rgb(0 0 0 / 5%);
font: inherit;
}
input:focus,
select:focus {
outline: none;
border-color: #3b82f6;
box-shadow: 0 0 0 2px #3b82f6;
}
button {
width: 100%;
padding: 0.5rem 1rem;
border: none;
border-radius: 0.375rem;
background: #2563eb;
color: #fff;
font: inherit;
cursor: pointer;
transition: background-color 0.15s;
}
button:hover {
background: #1d4ed8;
}
button:focus {
outline: 2px solid #3b82f6;
outline-offset: 2px;
}
form > * + * {
margin-top: 1rem;
}
.card {
padding: 1.5rem;
border-radius: 0.5rem;
background: #fff;
box-shadow:
0 4px 6px -1px rgb(0 0 0 / 10%),
0 2px 4px -2px rgb(0 0 0 / 10%);
}
.error {
margin-bottom: 1rem;
padding: 0.75rem 1rem;
border: 1px solid #f87171;
border-radius: 0.25rem;
background: #fee2e2;
color: #b91c1c;
}
/* Login page: the card centred on the screen. */
.login {
display: flex;
align-items: center;
justify-content: center;
}
.login .card {
width: 100%;
max-width: 28rem;
padding: 2rem;
}
.login h1 {
margin-bottom: 1.5rem;
text-align: center;
}
/* Generator page. */
.page {
max-width: 42rem;
margin: 0 auto;
padding: 2rem 1rem;
}
header {
display: flex;
justify-content: space-between;
align-items: center;
margin-bottom: 2rem;
}
header a {
font-size: 0.875rem;
color: #4b5563;
}
header a:hover {
color: #1f2937;
}
.result {
margin-bottom: 1.5rem;
padding: 1rem;
border: 1px solid #bbf7d0;
border-radius: 0.5rem;
background: #f0fdf4;
}
.result h2 {
margin: 0 0 0.5rem;
font-size: 0.875rem;
font-weight: 500;
color: #166534;
}
.result div {
display: flex;
gap: 0.5rem;
}
.result input {
flex: 1;
border-color: #86efac;
box-shadow: none;
font-family: ui-monospace, monospace;
font-size: 0.875rem;
}
.result button {
width: auto;
padding: 0.5rem 0.75rem;
background: #16a34a;
font-size: 0.875rem;
}
.result button:hover {
background: #15803d;
}
.result p {
margin: 0.5rem 0 0;
font-size: 0.75rem;
color: #16a34a;
}
.columns {
display: grid;
grid-template-columns: repeat(2, minmax(0, 1fr));
gap: 1rem;
}
.note {
margin-top: 1rem;
font-size: 0.75rem;
color: #6b7280;
text-align: center;
}
internal/static/tailwind.js
-83
View File
File diff suppressed because one or more lines are too long
internal/templates/generator.html
+31 -57
View File
@@ -4,52 +4,47 @@
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Pixa - URL Generator</title>
<script src="/static/tailwind.js"></script>
<link rel="stylesheet" href="/static/style.css">
</head>
<body class="bg-gray-100 min-h-screen">
<div class="max-w-2xl mx-auto py-8 px-4">
<div class="flex justify-between items-center mb-8">
<h1 class="text-2xl font-bold text-gray-800">Pixa URL Generator</h1>
<a href="/logout" class="text-sm text-gray-600 hover:text-gray-800 underline">
<body>
<div class="page">
<header>
<h1>Pixa URL Generator</h1>
<a href="/logout">
Logout
</a>
</div>
</header>
{{if .GeneratedURL}}
<div class="bg-green-50 border border-green-200 rounded-lg p-4 mb-6">
<h2 class="text-sm font-medium text-green-800 mb-2">Generated URL</h2>
<div class="flex gap-2">
<div class="result">
<h2>Generated URL</h2>
<div>
<input
type="text"
readonly
value="{{.GeneratedURL}}"
id="generated-url"
class="flex-1 px-3 py-2 bg-white border border-green-300 rounded-md text-sm font-mono"
onclick="this.select()"
>
<button
onclick="navigator.clipboard.writeText(document.getElementById('generated-url').value)"
class="px-3 py-2 bg-green-600 text-white rounded-md hover:bg-green-700 text-sm"
>
<button id="copy-url">
Copy
</button>
</div>
<p class="text-xs text-green-600 mt-2">
<p>
Expires: {{.ExpiresAt}}
</p>
</div>
{{end}}
{{if .Error}}
<div class="bg-red-100 border border-red-400 text-red-700 px-4 py-3 rounded mb-6">
<div class="error">
{{.Error}}
</div>
{{end}}
<form method="POST" action="/generate" class="bg-white rounded-lg shadow-md p-6 space-y-4">
<form method="POST" action="/generate" class="card">
{{ .CSRFField }}
<div>
<label for="url" class="block text-sm font-medium text-gray-700 mb-1">
<label for="url">
Source URL
</label>
<input
@@ -59,13 +54,12 @@
required
placeholder="https://example.com/image.jpg"
value="{{.FormURL}}"
class="w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-blue-500"
>
</div>
<div class="grid grid-cols-2 gap-4">
<div class="columns">
<div>
<label for="width" class="block text-sm font-medium text-gray-700 mb-1">
<label for="width">
Width
</label>
<input
@@ -76,11 +70,10 @@
max="8192"
value="{{if .FormWidth}}{{.FormWidth}}{{else}}0{{end}}"
placeholder="0 = original"
class="w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-blue-500"
>
</div>
<div>
<label for="height" class="block text-sm font-medium text-gray-700 mb-1">
<label for="height">
Height
</label>
<input
@@ -91,21 +84,16 @@
max="8192"
value="{{if .FormHeight}}{{.FormHeight}}{{else}}0{{end}}"
placeholder="0 = original"
class="w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-blue-500"
>
</div>
</div>
<div class="grid grid-cols-2 gap-4">
<div class="columns">
<div>
<label for="format" class="block text-sm font-medium text-gray-700 mb-1">
<label for="format">
Format
</label>
<select
id="format"
name="format"
class="w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-blue-500"
>
<select id="format" name="format">
<option value="orig" {{if eq .FormFormat "orig"}}selected{{end}}>Original</option>
<option value="jpeg" {{if eq .FormFormat "jpeg"}}selected{{end}}>JPEG</option>
<option value="png" {{if eq .FormFormat "png"}}selected{{end}}>PNG</option>
@@ -115,14 +103,10 @@
</select>
</div>
<div>
<label for="quality" class="block text-sm font-medium text-gray-700 mb-1">
<label for="quality">
Quality
</label>
<select
id="quality"
name="quality"
class="w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-blue-500"
>
<select id="quality" name="quality">
<option value="25" {{if eq .FormQuality "25"}}selected{{end}}>Potato</option>
<option value="50" {{if eq .FormQuality "50"}}selected{{end}}>Low</option>
<option value="70" {{if eq .FormQuality "70"}}selected{{end}}>Medium</option>
@@ -132,16 +116,12 @@
</div>
</div>
<div class="grid grid-cols-2 gap-4">
<div class="columns">
<div>
<label for="fit" class="block text-sm font-medium text-gray-700 mb-1">
<label for="fit">
Fit Mode
</label>
<select
id="fit"
name="fit"
class="w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-blue-500"
>
<select id="fit" name="fit">
<option value="cover" {{if eq .FormFit "cover"}}selected{{end}}>Cover</option>
<option value="contain" {{if eq .FormFit "contain"}}selected{{end}}>Contain</option>
<option value="fill" {{if eq .FormFit "fill"}}selected{{end}}>Fill</option>
@@ -150,14 +130,10 @@
</select>
</div>
<div>
<label for="ttl" class="block text-sm font-medium text-gray-700 mb-1">
<label for="ttl">
Expires In
</label>
<select
id="ttl"
name="ttl"
class="w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-blue-500"
>
<select id="ttl" name="ttl">
<option value="0" {{if or (eq .FormTTL "0") (eq .FormTTL "")}}selected{{end}}>Never</option>
<option value="60" {{if eq .FormTTL "60"}}selected{{end}}>1 minute</option>
<option value="3600" {{if eq .FormTTL "3600"}}selected{{end}}>1 hour</option>
@@ -169,17 +145,15 @@
</div>
</div>
<button
type="submit"
class="w-full bg-blue-600 text-white py-2 px-4 rounded-md hover:bg-blue-700 focus:outline-none focus:ring-2 focus:ring-blue-500 focus:ring-offset-2 transition-colors"
>
<button type="submit">
Generate Encrypted URL
</button>
</form>
<p class="text-xs text-gray-500 mt-4 text-center">
<p class="note">
Generated URLs are encrypted and cannot be modified. They will expire at the specified time.
</p>
</div>
<script src="/static/generator.js"></script>
</body>
</html>
internal/templates/login.html
+8 -12
View File
@@ -4,22 +4,22 @@
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Pixa - Login</title>
<script src="/static/tailwind.js"></script>
<link rel="stylesheet" href="/static/style.css">
</head>
<body class="bg-gray-100 min-h-screen flex items-center justify-center">
<div class="bg-white p-8 rounded-lg shadow-md w-full max-w-md">
<h1 class="text-2xl font-bold text-gray-800 mb-6 text-center">Pixa Image Proxy</h1>
<body class="login">
<div class="card">
<h1>Pixa Image Proxy</h1>
{{if .Error}}
<div class="bg-red-100 border border-red-400 text-red-700 px-4 py-3 rounded mb-4">
<div class="error">
{{.Error}}
</div>
{{end}}
<form method="POST" action="/" class="space-y-4">
<form method="POST" action="/">
{{ .CSRFField }}
<div>
<label for="key" class="block text-sm font-medium text-gray-700 mb-1">
<label for="key">
Signing Key
</label>
<input
@@ -28,15 +28,11 @@
name="key"
required
autocomplete="current-password"
class="w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-blue-500"
placeholder="Enter your signing key"
>
</div>
<button
type="submit"
class="w-full bg-blue-600 text-white py-2 px-4 rounded-md hover:bg-blue-700 focus:outline-none focus:ring-2 focus:ring-blue-500 focus:ring-offset-2 transition-colors"
>
<button type="submit">
Login
</button>
</form>
script/bootstrap
+9 -2
View File
@@ -5,8 +5,10 @@
# or apk (detected in that order); assumes NOTHING is present (not git,
# make, or go). The linter is never installed on the host: golangci-lint
# runs only inside a container, Dockerfile.lint or the Dockerfile lint
# stage (see script/lint). CGO image libraries (pkg-config, vips,
# libheif) are installed for the govips bindings.
# stage (see script/lint). A C compiler and the CGO image libraries
# (pkg-config, vips, libheif) are installed for the govips bindings.
# Both Dockerfiles run this script too, so their build dependencies are
# the ones listed here.
set -eu
ROOT="$(cd "$(dirname "$0")/.." && pwd -P)"
@@ -53,6 +55,11 @@ missing() {
# CGO dependencies for govips (image processing)
ensure_cgo_deps() {
# cgo compiles with gcc on Linux; build-base and build-essential
# also bring the C library headers.
if missing gcc; then
pkg_install gcc build-essential gcc build-base
fi
if missing pkg-config; then
pkg_install pkg-config pkg-config pkg-config pkgconfig
fi
script/cibuild
+7 -4
View File
@@ -1,15 +1,18 @@
#!/bin/sh
# script/cibuild: run the CI build. The Dockerfile runs the checks
# (make fmt-check, lint, test), so a successful build implies a green
# repo. Generic: needs no adaptation. The Gitea workflow runs this on
# push.
# (make fmt-check, lint, test) as build steps. This script passes a new
# CHECK_EPOCH on every run, so Docker runs those steps instead of
# reusing cached results: a successful run means the checks ran and
# passed on this tree. Generic: needs no adaptation. The Gitea workflow
# runs this on push.
set -eu
ROOT="$(cd "$(dirname "$0")/.." && pwd -P)"
main() {
cd "$ROOT"
docker build .
epoch="$(date +%s)$$"
docker build --build-arg CHECK_EPOCH="$epoch" .
}
main "$@"
script/docker
+7 -3
View File
@@ -1,7 +1,9 @@
#!/bin/sh
# script/docker: build the Docker image tagged with the project name.
# Identical in all repos; the tag comes from script/projectname.
# Generic: needs no adaptation.
# Identical in all repos; the tag comes from script/projectname. Like
# script/cibuild, it passes a new CHECK_EPOCH, so the build runs the
# checks instead of reusing cached results. Generic: needs no
# adaptation.
set -eu
SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd -P)"
@@ -9,7 +11,9 @@ ROOT="$(cd "$SCRIPT_DIR/.." && pwd -P)"
main() {
cd "$ROOT"
docker build -t "$("$SCRIPT_DIR/projectname")" .
epoch="$(date +%s)$$"
docker build --build-arg CHECK_EPOCH="$epoch" \
-t "$("$SCRIPT_DIR/projectname")" .
}
main "$@"
scripts/manual-test.sh
-147
View File
@@ -1,147 +0,0 @@
#!/bin/bash
#
# Manual test script for pixa server
# Requires: server running on localhost:8080
#
set -e
BASE_URL="${BASE_URL:-http://localhost:8080}"
SIGNING_KEY="${SIGNING_KEY:-test-signing-key-for-development-only}"
TEST_IMAGE_URL="https://s3.sneak.cloud/sneak-public/2021/2021-04-18.untitled.a7r4.07723.jpg"
COOKIE_JAR=$(mktemp)
cleanup() {
rm -f "$COOKIE_JAR"
}
trap cleanup EXIT
pass() {
echo "✓ PASS: $1"
}
fail() {
echo "✗ FAIL: $1"
exit 1
}
echo "=== Pixa Manual Test Suite ==="
echo "Base URL: $BASE_URL"
echo ""
# Test 1: Healthcheck
echo "--- Test 1: Healthcheck endpoint ---"
HEALTH=$(curl -sf "$BASE_URL/.well-known/healthcheck.json")
if echo "$HEALTH" | grep -q '"status"'; then
pass "Healthcheck returns status"
else
fail "Healthcheck did not return expected response"
fi
# Test 2: Login page displays
echo "--- Test 2: Login page (GET /) ---"
LOGIN_PAGE=$(curl -sf "$BASE_URL/")
if echo "$LOGIN_PAGE" | grep -qi "password\|login\|sign"; then
pass "Login page displays password form"
else
fail "Login page did not display expected content"
fi
# Test 3: Wrong password shows error
echo "--- Test 3: Login with wrong password ---"
WRONG_LOGIN=$(curl -sf -X POST "$BASE_URL/" -d "key=wrong-key" -c "$COOKIE_JAR")
if echo "$WRONG_LOGIN" | grep -qi "invalid\|error\|incorrect\|wrong"; then
pass "Wrong password shows error message"
else
fail "Wrong password did not show error"
fi
# Test 4: Correct password redirects to generator
echo "--- Test 4: Login with correct signing key ---"
curl -sf -X POST "$BASE_URL/" -d "key=$SIGNING_KEY" -c "$COOKIE_JAR" -b "$COOKIE_JAR" -L -o /dev/null
GENERATOR_PAGE=$(curl -sf "$BASE_URL/" -b "$COOKIE_JAR")
if echo "$GENERATOR_PAGE" | grep -qi "generate\|url\|source\|logout"; then
pass "Correct password shows generator page"
else
fail "Generator page not displayed after login"
fi
# Test 5: Generate encrypted URL
echo "--- Test 5: Generate encrypted URL ---"
GEN_RESULT=$(curl -sf -X POST "$BASE_URL/generate" -b "$COOKIE_JAR" \
-d "url=$TEST_IMAGE_URL" \
-d "width=800" \
-d "height=600" \
-d "format=jpeg" \
-d "quality=85" \
-d "fit=cover" \
-d "ttl=3600")
if echo "$GEN_RESULT" | grep -q "/v1/e/"; then
pass "Encrypted URL generated"
# Extract the encrypted URL
ENC_URL=$(echo "$GEN_RESULT" | grep -o '/v1/e/[^"<]*' | head -1)
echo " Generated URL: $ENC_URL"
else
fail "Failed to generate encrypted URL"
fi
# Test 6: Fetch image via encrypted URL
echo "--- Test 6: Fetch image via encrypted URL ---"
if [ -n "$ENC_URL" ]; then
HTTP_CODE=$(curl -sf -o /dev/null -w "%{http_code}" "$BASE_URL$ENC_URL")
if [ "$HTTP_CODE" = "200" ]; then
pass "Encrypted URL returns image (HTTP 200)"
else
fail "Encrypted URL returned HTTP $HTTP_CODE"
fi
else
fail "No encrypted URL to test"
fi
# Test 7: Fetch image via allowlisted host (direct proxy)
echo "--- Test 7: Fetch image via direct proxy (allowlisted host) ---"
# URL format: /v1/image/<host>/<path>/<WxH>.<format>
PROXY_PATH="/v1/image/s3.sneak.cloud/sneak-public/2021/2021-04-18.untitled.a7r4.07723.jpg/400x300.jpeg"
HTTP_CODE=$(curl -sf -o /dev/null -w "%{http_code}" "$BASE_URL$PROXY_PATH")
if [ "$HTTP_CODE" = "200" ]; then
pass "Direct proxy returns image (HTTP 200)"
else
fail "Direct proxy returned HTTP $HTTP_CODE"
fi
# Test 8: Logout
echo "--- Test 8: Logout ---"
curl -sf "$BASE_URL/logout" -b "$COOKIE_JAR" -c "$COOKIE_JAR" -L -o /dev/null
AFTER_LOGOUT=$(curl -sf "$BASE_URL/" -b "$COOKIE_JAR")
if echo "$AFTER_LOGOUT" | grep -qi "password\|login"; then
pass "Logout redirects to login page"
else
fail "Logout did not redirect to login"
fi
# Test 9: Generate short-TTL URL and verify expiration
echo "--- Test 9: Expired URL returns 410 ---"
# Login again
curl -sf -X POST "$BASE_URL/" -d "key=$SIGNING_KEY" -c "$COOKIE_JAR" -b "$COOKIE_JAR" -L -o /dev/null
# Generate URL with 1 second TTL
GEN_RESULT=$(curl -sf -X POST "$BASE_URL/generate" -b "$COOKIE_JAR" \
-d "url=$TEST_IMAGE_URL" \
-d "width=100" \
-d "height=100" \
-d "format=jpeg" \
-d "ttl=1")
SHORT_URL=$(echo "$GEN_RESULT" | grep -o '/v1/e/[^"<]*' | head -1)
if [ -n "$SHORT_URL" ]; then
echo " Waiting 2 seconds for URL to expire..."
sleep 2
HTTP_CODE=$(curl -s -o /dev/null -w "%{http_code}" "$BASE_URL$SHORT_URL")
if [ "$HTTP_CODE" = "410" ]; then
pass "Expired URL returns 410 Gone"
else
fail "Expired URL returned HTTP $HTTP_CODE (expected 410)"
fi
else
fail "Could not generate short-TTL URL"
fi
echo ""
echo "=== All tests passed! ==="