The repodata coalescing tests released the gated build after a fixed 50ms sleep, so a goroutine stalled past that window under -race could miss the in-flight singleflight call, trigger a second build and flake the test.
- add sfWaiters, counting goroutines parked in singleflight Do via runtime.Stack
- release the gate only once every follower is parked on the in-flight call
- drop the trailing sleep from waitFor
Reviewed-on: #177
Co-authored-by: unkin-agent <unkin-agent@unkin.net>
Co-committed-by: unkin-agent <unkin-agent@unkin.net>
github_rpm remotes regenerate repomd and all three gz files from every metadata row on each request, which is expensive for large repos under repeated dnf traffic.
- add a per-remote `cache_repodata` toggle (column, model, v2 API, docs)
- cache built repodata per replica, rebuilt via singleflight when the `count(*)`+`max(id)` row fingerprint moves
- store a build only if no newer build has landed; evict idle entries hourly
- map cached-path DB errors like the uncached path: 503 + Retry-After on cancel/deadline, generic 500 otherwise
- check `cacheEmpty` via the fingerprint for all github_rpm remotes, not only cached ones
Reviewed-on: #168
Co-authored-by: unkin-agent <unkin-agent@unkin.net>
Co-committed-by: unkin-agent <unkin-agent@unkin.net>
unkin-agent