Description
RespondJSON logged every Encode failure as Failed to encode JSON response at error level. The encoder writes straight to the socket, so a client that drops mid-response (closed tab, proxy timeout, canceled fetch) looked like a serialization fault.
Now a write failure caused by the peer going away logs Client disconnected before the JSON response was written at debug. Everything else keeps the error line. Status and body are unchanged.
- Moved the SSE manager's
isClientDisconnectlogic intohttphelpers.IsClientDisconnectso there is one definition. The SSE one now just calls it. I addederrors.Ischecks forsyscall.EPIPE/syscall.ECONNRESETon top of the existingnet.ErrClosed, context and message checks (the message matches still cover the Windows aborted / forcibly closed forms). RespondJSONskips the debug path forjson.MarshalerError,UnsupportedTypeErrorandUnsupportedValueError, so a real serialization failure stays at error even if its message happens to look like a disconnect.
Fixes #2713
Behaviour change
None for users apart from less error-level log noise on client disconnects.
How has this been tested?
CI-level only. New tests cover wrapped EPIPE and ECONNRESET, both Windows forms, channel / NaN / failing MarshalJSON still at error, an unrelated writer error still at error, and the 204 / 304 / nil-data paths logging nothing. go test -race passes for pkg/httphelpers and internal/api/sse. In internal/api/handlers the only failure is TestSeasonPackApply_Returns500ForFailedApplyResponse, which fails the same way on develop without this change.
Performance
No measurable cost. The only new work is on the error path of Encode (a few errors.Is / errors.As calls and a lowercase of the error string), which already ends in a log line. The success path is untouched, so no before/after measurement.
Checklist
- My PR title follows the Conventional Commits format (it becomes the squashed commit message)
- If this changes the database schema, I have added migrations for both SQLite and PostgreSQL (no schema change)
- I completed the mandatory performance checks and recorded the outcome in Performance
AI disclosure
Yes. The change was written with an AI coding agent working under my direction; I reviewed the diff and ran the tests locally.
Activity
6
coderabbitai[bot]26d agoActionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @pkg/httphelpers/disconnect.go:
- Line 40: Remove the unconditional `strings.Contains(msg, "wsasend:")` match in
the disconnect-error detection and match only Windows error messages that
specifically indicate a client disconnect, so unrelated `wsasend` failures
continue to be reported as errors by `RespondJSON`.
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📥 Commits
Reviewing files that changed from the base of the PR and between d96201b6b56bb806bb7fcdf23a192e0b26afc1b2 and 2b603090c3274718e9304057fd65cfbcb8decfbb.
📒 Files selected for processing (5)
internal/api/handlers/helpers.gointernal/api/handlers/helpers_test.gointernal/api/sse/manager.gopkg/httphelpers/disconnect.gopkg/httphelpers/disconnect_test.go
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cestercian25d agoGood catch, dropped the blanket wsasend: match. The two Windows disconnect messages are still caught by their own text, and I added a case so wsasend: An invalid argument was supplied stays an error.
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62c97702-f300-4b62-ba31-b377fe3702ab📥 Commits
Reviewing files that changed from the base of the PR and between 2b603090c3274718e9304057fd65cfbcb8decfbb and e25380cf94dc2042743ca8e4c3a48e15e5ad14bd.
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pkg/httphelpers/disconnect.gopkg/httphelpers/disconnect_test.go🚧 Files skipped from review as they are similar to previous changes (2)
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📝 Walkthrough
Walkthrough
The change adds
httphelpers.IsClientDisconnectand updates the SSE manager to use it.RespondJSONnow logs recognized client disconnects at debug level when the error is not a JSON serialization failure. Serialization failures and unrelated write errors remain error-level logs. Tests cover disconnect errors, serialization failures, unrelated writer errors, and response paths that produce no logs.Priority: ⬇️ Low
Severity of issue fixed: Low
Merge Risk: ⚪ Minimal · up to
e2538The change appears ready to merge after normal checks: recognized client disconnects receive debug-level logging, while the inspected serialization and unrelated-write failures retain error-level logging.
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