Share one fetch and transcode among concurrent misses (closes #65)

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Author	SHA1	Message	Date
clawbot	4009490242	Share one fetch and transcode among concurrent misses (closes #65 ) check / check (push) Waiting to run 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 does not end with its own; 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, as before. Each request counts one miss; the processing counts its fetch and transcode once. A panic while processing becomes an error instead of stopping pixad. Model: opus-5-5	2026-09-29 11:02:03 +00:00
clawbot	bcd5363d99	Test that concurrent misses for one variant share one fetch (closes #65 ) Requests that miss the same variant while its fetch is held must make one fetch and one transcode between them, all get the same image and each count one miss. Variants differing only in quality or fit stay apart. A waiting request whose context ends returns at once; the first request's client leaving does not stop the work. A shared failure reaches every request, the negative cache answers the next one, and an uncached failure is fetched again. A request that has already ended fetches nothing, and a panic comes back as an error. All but the variants test fail on next. Model: opus-5-5	2026-09-29 11:01:33 +00:00

Author

SHA1

Message

Date

clawbot

4009490242

Share one fetch and transcode among concurrent misses (closes #65 )

check / check (push) Waiting to run

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 does not end
with its own; 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, as before. Each request counts one
miss; the processing counts its fetch and transcode once. A panic
while processing becomes an error instead of stopping pixad.

Model: opus-5-5

2026-09-29 11:02:03 +00:00

clawbot

bcd5363d99

Test that concurrent misses for one variant share one fetch (closes #65 )

Requests that miss the same variant while its fetch is held must make
one fetch and one transcode between them, all get the same image and
each count one miss. Variants differing only in quality or fit stay
apart. A waiting request whose context ends returns at once; the first
request's client leaving does not stop the work. A shared failure
reaches every request, the negative cache answers the next one, and an
uncached failure is fetched again. A request that has already ended
fetches nothing, and a panic comes back as an error. All but the
variants test fail on next.

Model: opus-5-5

2026-09-29 11:01:33 +00:00

Share one fetch and transcode among concurrent misses (closes #65) #160