EnsureCompressedImageCache passed the arriving caller's request context into
the singleflight body, which runs once for every concurrent requester of that
cache key. If the first client disconnected, gin canceled the context, the
shared generation aborted, and every follower received that failure and fell
back to the uncompressed original. Detach cancellation with
context.WithoutCancel so trace values still propagate but the shared work
outlives any single requester.
ServeFileByID and DownloadFile duplicated the lookup failure mapping and
each used an unchecked *strconv.NumError assertion that cannot match a
wrapped error. One helper now classifies 404 vs 400 via errors.As; each
endpoint keeps its own fallback for unclassified failures. ErrInvalidUploadID
became unused once both sites report ErrInvalidFileID for a malformed ID.
Five sites used == against sentinels (redis.Nil, ingest.ErrForbidden,
errs.ErrDatabaseUninitialized). The neighbouring not-found checks already
went through errors.Is helpers, so a wrapped error would silently downgrade
a 403 to a 400 and a 500 to a 400.
- Purify core micro-kernel by removing context hardcoded helpers and reverse dependencies
- Eliminate init() side effects in infra plugins with reversible lifecycle disposal
- Completely isolate plugins by removing cross-plugin imports and using core/contracts
- Introduce TaskService and RiskControlService contracts for unified cross-plugin APIs
- Regenerate Swagger documentation and update developer guide matrix
- Achieve 0 violations in check_cordis_architecture.sh and 100% test pass
- Relocated go.mod and go.sum into backend/ root directory
- Stripped redundant backend/ segments from all Go imports (github.com/Rain-kl/Wavelet/...)
- Unified Makefile, swagger, and build-test to execute in backend/ module context
- Ensured 100% build-test, code-check, format, and swagger pass
ryan