clawbot
bbcc7d921d
check / check (push) Successful in 12s
The root Dockerfile builds the only image; Dockerfile.backend is gone. Its stages: lint, a Go stage that runs the tests and builds netwatch-server, the node stage, and an nginx runtime. nginx serves dist/ on 8080 and proxies /api/ and /.well-known/healthcheck to the backend on 127.0.0.1:8081. bin/entrypoint.sh starts both, turns TERM or INT into a stop of both, and exits non-zero when either exits on its own. The backend runs as user netwatch and keeps reports on the /data volume. New setting BIND_ADDRESS (empty: every interface). STOPSIGNAL is SIGTERM, since the nginx image's SIGQUIT would miss the entrypoint. script/docker is the org model verbatim. Model: opus-5-5
120 lines
5.2 KiB
Markdown
120 lines
5.2 KiB
Markdown
netwatch-server is an MIT-licensed Go HTTP backend by
|
|
[@sneak](https://sneak.berlin) that receives telemetry reports from the NetWatch
|
|
SPA and persists them as zstd-compressed JSONL files on disk.
|
|
|
|
## Getting Started
|
|
|
|
From this directory:
|
|
|
|
```bash
|
|
# Build and run locally
|
|
make run
|
|
```
|
|
|
|
From the repo root, whose `Dockerfile` builds the one image that ships this
|
|
backend behind nginx (see [Container image](#container-image)):
|
|
|
|
```bash
|
|
# Run tests, lint, and format check over the frontend and this backend
|
|
make check
|
|
|
|
# Build the image: nginx, the frontend and this backend
|
|
make docker
|
|
docker run -p 8080:8080 netwatch
|
|
```
|
|
|
|
## Entrypoints
|
|
|
|
This directory follows the same
|
|
[Scripts to Rule Them All](https://github.com/github/scripts-to-rule-them-all)
|
|
pattern as the repo root: the targets in `backend/Makefile` are thin shims over
|
|
`backend/script/`. The root `Dockerfile` runs them, and the root scripts call
|
|
`test`, `fmt` and `fmt-check`:
|
|
|
|
- `script/build` — compile the static `netwatch-server` binary with its version
|
|
and architecture stamped in. The version is `VERSION` from the environment;
|
|
when that is unset or empty, it falls back to `git describe` inside a git
|
|
checkout, then to `dev`
|
|
- `script/test` — run the Go tests under a 30-second timeout
|
|
- `script/lint` — check `.golangci.yml` against its pinned sha256, then run
|
|
golangci-lint. It runs inside the golangci-lint image of the lint stage of
|
|
the root `Dockerfile`; from a checkout, run `make lint` at the repo root,
|
|
which builds that stage
|
|
- `script/fmt` — format the Go sources (writes)
|
|
- `script/fmt-check` — check Go formatting (read-only)
|
|
- `script/run` — build and run the server locally
|
|
- `script/clean` — remove build artifacts
|
|
|
|
There is no `check`, `hooks` or `docker` target here: the root `make check`
|
|
covers this directory, the root `make hooks` installs the repo's only pre-commit
|
|
hook, and the root `make docker` builds the image that contains this backend.
|
|
|
|
## Rationale
|
|
|
|
The NetWatch frontend collects latency measurements from the browser but has no
|
|
way to persist or aggregate them. This backend provides a minimal
|
|
`POST /api/v1/reports` endpoint that buffers incoming reports in memory and
|
|
flushes them to compressed files on disk for later analysis.
|
|
|
|
## Design
|
|
|
|
The server is structured as an `fx`-wired Go application under `cmd/netwatch-server/`.
|
|
Internal packages in `internal/` follow standard Go project layout:
|
|
|
|
- **`config`**: Loads configuration from environment variables and config files
|
|
via Viper.
|
|
- **`handlers`**: HTTP request handlers for the API (health check, report
|
|
ingestion).
|
|
- **`reportbuf`**: In-memory buffer that accumulates JSONL report lines and
|
|
flushes to zstd-compressed files when the buffer reaches 10 MiB or every 60
|
|
seconds.
|
|
- **`server`**: Chi-based HTTP server with middleware wiring and route
|
|
registration.
|
|
- **`healthcheck`**, **`middleware`**, **`logger`**, **`globals`**: Supporting
|
|
infrastructure.
|
|
|
|
### Configuration
|
|
|
|
| Variable | Default | Description |
|
|
| ----------------- | -------------------- | -------------------------------------------------------------------------------------------------------- |
|
|
| `BIND_ADDRESS` | empty | IP address to listen on; empty listens on every interface |
|
|
| `PORT` | `8080` | HTTP listen port |
|
|
| `DATA_DIR` | `./data/reports` | Directory for compressed reports |
|
|
| `DEBUG` | `false` | Enable debug logging |
|
|
| `TRUSTED_PROXIES` | loopback + RFC1918 | Comma-separated CIDRs whose `X-Forwarded-For` / `X-Real-IP` headers are trusted for client IP resolution |
|
|
|
|
`TRUSTED_PROXIES` defaults to `127.0.0.1/32,::1/128,10.0.0.0/8,172.16.0.0/12,192.168.0.0/16`.
|
|
The loopback entries cover the reverse proxy that shares the container; the
|
|
RFC1918 ranges match `nginx.conf`. A request whose direct peer is outside this
|
|
set has its forwarded headers ignored, and the direct peer is logged instead.
|
|
|
|
### Container image
|
|
|
|
The root `Dockerfile` builds one image in which nginx listens on the public port
|
|
8080, serves the frontend, and proxies `/api/` and `/.well-known/healthcheck` to
|
|
this server. The image's entrypoint, `bin/entrypoint.sh`, starts the server as
|
|
user `netwatch` (uid 1000) with `BIND_ADDRESS=127.0.0.1` and `PORT=8081`, so
|
|
only nginx reaches it. `DATA_DIR` is `/data/reports`, on the `/data` volume,
|
|
which `netwatch` owns.
|
|
|
|
### Report storage
|
|
|
|
Reports are written as `reports-<timestamp>.jsonl.zst` files in `DATA_DIR`.
|
|
Each file contains one JSON object per line, compressed with zstd. Files are
|
|
created with `O_EXCL` to prevent overwrites.
|
|
|
|
## TODO
|
|
|
|
- Add integration test that POSTs a report and verifies the compressed output
|
|
- Add report decompression/query endpoint
|
|
- Add metrics (Prometheus) for buffer size, flush count, report count
|
|
- Add retention policy to prune old report files
|
|
|
|
## License
|
|
|
|
MIT. See [LICENSE](LICENSE).
|
|
|
|
## Author
|
|
|
|
[@sneak](https://sneak.berlin)
|