The five counts the cache_stats table held are now Prometheus counters in
memory, in internal/imgcache/counters.go, on the default registry that
/metrics serves. The Increment methods add to them, so counting makes no
database call.
cache_stats, Cache.Stats, Service.Stats, CacheStats and the pending counts
are gone, with their tests. The background goroutine now writes only access
times, and its names say so: StartPendingAccessTimeWrites,
StopPendingAccessTimeWrites and pendingaccesstimes.go.
The counters count for the whole process, so the tests that check how much
they rose do not call t.Parallel. Two stop tests whose write under way was a
hit count now use an access time.
Model: opus-5-5
A hit opens the variant file and nothing else: its content type comes
from the file's first bytes, and a file in no output format is a miss.
Its access time and count, and the access time of a cached source a
miss uses, go without waiting to one background goroutine that writes
them once a second; each kind of access time waits in a channel of
10,000 that drops the rest. Expired negative cache rows are left to
CleanExpired. The .meta files, metaCache, Lookup and golang-lru go,
with their tests; the two reconciliation walks, identical without the
.meta skip, share one. make bench runs a parallel cache hit benchmark
on the host, outside make check.
Model: opus-5-5
sneak
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