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fix(claude): log a stalled or over-cap passthrough stream as a 502 incomplete row - #6354
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…complete row tapAnthropicSseForLog ended a body stall or byte-cap overflow with an Anthropic error frame but finalized the row as status 200 with only closeReason body_stall / body_overflow. usage.jsonl persists failure diagnostics only for rows at status >= 400 or with a non-completed terminalStatus, so these cut-short turns reached it as plain 200 rows with no closeReason and no reason: anything reading usage.jsonl counted them as successes. The Responses relay logs the same events (a stall-timeout incomplete) as 502 with terminalStatus "incomplete"; httpStatusForRequestLogTerminal maps only a max_output_tokens incomplete to 200. The tap now does the same: 502, terminalStatus "incomplete", the existing closeReason, and the proxy's own message in upstreamError. A mid-stream reset stays 502 / failed, so the two differ only in terminalStatus. The client stream is unchanged. This settles the status split raised in the lidge-jun#6235 review.
…ed turn Review follow-up. failBody did not check whether the turn's own terminal (message_stop or an upstream error event) had already gone through, unlike the read-error branch. An upstream that sent message_stop and then idled past bodyStallSec, or kept sending past the byte cap, got an error frame appended after message_stop and, with the 502 row, would have counted as a failed turn the client had fully received. It now logs 200 / terminal and closes without a frame. Tests: A1/A2 compare the full finalize meta; the managed lane gains a streaming stall case that checks terminalStatus and the tap's reason, and its fold test pins terminalStatus. The structure doc limits the Responses parity claim to the stall and describes the byte cap as matching the non-stream passthrough's 502.
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Navigate logical layers of code changes, visualize relationships, and explore their blast radius. No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: Repository: lidge-jun/opencodex/.coderabbit.yaml Review profile: ASSERTIVE Plan: Advanced Run ID: 📒 Files selected for processing (3)
Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 8 remain after this review. 📝 WalkthroughWalkthroughStalled or oversized streams that have not emitted an Anthropic terminal event now finalize with status 502 and terminal status ChangesClaude stream finalization
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix Suggested reviewers: Merge Risk: ⚪ Minimal · up to Incomplete Claude streams are logged as 502 while completed turns remain successful without an appended error frame. No actionable merge-blocking risk is established from the supplied evidence; normal checks should still pass before merging. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The change improves reporting of interrupted streams while preserving existing limits and cancellation controls. No expanded access or privilege was identified. Incomplete validation of downstream behavior leaves low residual risk. Retained concerns Security review detailsSecurity Blast Radius
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Full details: Docstring CoverageExplanation Docstring coverage is 75.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 4 files. (1 skipped: 1 unsupported.)
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Review comments at @src/server/claude-messages.ts:
- Line 373: Update the SSE inspection parser that sets terminalSeen to recognize
blank-line delimiters using CRLF, CR, or LF, including delimiters split across
chunks, while preserving the original bytes forwarded by
controller.enqueue(value). Add regression coverage for terminal frames followed
by a stall and by overflow, ensuring both are recognized as complete.
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📒 Files selected for processing (5)
src/server/claude-messages.tsstructure/clients/claude-desktop.mdtests/claude-integration/claude-messages-endpoint.test.tstests/claude-integration/claude-native-passthrough.test.tstests/claude-integration/messages-native.test.ts
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CodeRabbit follow-up. The tap's inspection split frames on "\n\n" only, so a CRLF- or CR-delimited stream never had its frames seen: usage was not read, and with this PR's terminal check a finished turn that then stalled or overflowed would be logged as a 502 incomplete with an error frame after message_stop. The inspection copy is now normalized to LF (forwarded bytes untouched), holding a trailing CR until the next chunk so a CRLF split across chunks stays one line ending. The tail flush the read-error branch already did is now shared with failBody, so a terminal block still in the buffer (an upstream that went quiet right after it, or a held CR) counts there too; the blank line is restored only when the client has not received one.
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Reviewed 97254b5 against dev 6429463, including the terminal/tail/cancellation paths and both native consumers. My isolated Bun 1.4.0 run of tests/claude-integration/claude-native-passthrough.test.ts and tests/claude-integration/messages-native.test.ts passed 80 tests / 721 assertions under CPUQuota=75%, MemoryMax=1536M and fresh application homes. The new stall/overflow rows, post-terminal completion, CR/CRLF and split-delimiter cases pass; no new P0-P2 found in this scoped review. Exact-head hosted CI is now authorized. The author has now marked this same head ready and attested the four readiness boxes. Approval remains pending the in-progress current-head required CI; no merge approval or full-suite success is claimed. The old EOF path remains outside this change, and I did not rerun the broader baseline failures described by the author. No security scan or live account/service change was performed. This overlaps the native helper/document area of #6356; after either lands, retain both terminal diagnostics and the rate-limit header regression when validating the other.
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Approved exact head 97254b5. The previous scoped review and resource-bounded 80-test / 721-assertion run cover both native lanes, stall/overflow persistence, terminal-first completion, CR/CRLF and split delimiters. The valid delimiter finding is resolved; current-head Cross-platform CI 36818324318 and required checks are successful, and readiness is complete. Trusted dev has since advanced two commits to a6114b6; the role/state-snapshot changes do not change these native stream sections. No unchanged test rerun, security scan, live account operation or merge was performed. Preserve the header-family regression in #6356 when integrating either overlapping change.
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Summary
When a native Claude passthrough stream stalls (
bodyStallSec) or exceeds the byte cap (bodyMaxBytes),tapAnthropicSseForLog(src/server/claude-messages.ts) ends the body with an Anthropic error frame. The row, however, is finalized as status 200 with onlycloseReason: "body_stall"/"body_overflow".addRequestLogpersists failure diagnostics to usage.jsonl only for rows at status ≥ 400 or with a non-completedterminalStatus(src/server/request-log.ts,failureDiagnostics). So these cut-short turns reach usage.jsonl as plain 200 rows with nocloseReasonand no reason, and everything that reads usage.jsonl counts them as successes. The in-memory/api/logsrow still has thecloseReason.This settles the status split raised in the #6235 review ("stall 200 vs reset 502"). The Responses relay already decided it: a stall-timeout incomplete is logged as 502 with
terminalStatus: "incomplete".httpStatusForRequestLogTerminalmaps only amax_output_tokensincomplete to 200, and its decision log reads "Stall, EOF, and unknown incompletes must remain visible failures" (7fcaa9119).Change
src/server/claude-messages.ts,failBody): finalize with status 502,terminalStatus: "incomplete", the existingcloseReason, and the proxy's own message inupstreamError. The message is proxy-owned text with no upstream content (for exampleanthropic passthrough body stalled: no upstream bytes for 90s). A mid-stream reset stays 502 /failed, so the two now differ only byterminalStatus. The client stream is unchanged.message_stopor an upstreamerrorevent): a stall or overflow is a finished turn. It logs 200 /terminaland closes without an error frame, matching the read-error branch from fix(claude): end a passthrough stream on an upstream reset with an Anthropic error event #6235. Before this PR such a turn also got an error frame appended aftermessage_stop.97254b530): the tap's inspection split frames on\n\nonly, so a CRLF- or CR-delimited stream never had its frames seen. Usage was not read, and a finished turn that then stalled would have logged as a failure. The inspection copy is now normalized to LF, with the forwarded bytes untouched. A trailing CR is held until the next chunk, so a CRLF split across chunks stays one line ending.failBodyshares the read-error branch's tail flush, and the blank line is restored only when the client has not received one.src/server/messages-native.ts): no source change. Its streaming finalize already forwards the tap's meta (fix(claude): end a passthrough stream on an upstream reset with an Anthropic error event #6235), so its rows change the same way, and its non-streaming fold keeps forwarding the tap's meta.structure/clients/claude-desktop.md: the "not uniform" sentence added in fix(claude): end a passthrough stream on an upstream reset with an Anthropic error event #6235 now describes a uniform 502. The Responses parity is claimed for the stall only. The byte cap is described as matching the non-stream passthrough's 502body_overflow, since the Responses side has no byte-cap incomplete.Effects, checked by reading each consumer:
classifyRequestOutcome/ Prometheusincompletebefore and after.errorCodeupstream_server_error, the code the Responses stall row gets.Verification
Head
97254b530ondev64294638a(0 behind), Bun 1.4.0 (package.json).RED first. With
src/server/claude-messages.tsreverted todev, all of the following fail:a stalled native stream logs a 502 incomplete row and keeps its diagnostics in usage.jsonla native stream over the byte cap logs a 502 incomplete row and keeps its diagnostics in usage.jsonla relayed stream over the byte cap is a 502 incomplete row, like the passthrough(managed lane)claude-messages-endpoint.test.ts, which now compare the full finalize meta)Against the first commit
999713197, two more fail, showing the error frame aftermessage_stop:a turn that sent message_stop and then stalls is finished: 200 terminal, no error framebytes past the cap after message_stop do not turn a finished turn into a failureAgainst
abf0b15e5, four CRLF/CR cases fail: CRLF- and CR-delimited turns that then stall (including usage), a CRLF split across chunks, and a CRLF turn followed by bytes past the cap.Also added: a managed-lane streaming stall case that checks
terminalStatusand the tap's reason, and aterminalStatusassertion on the existing fold test.Targeted.
bun test tests/lab/core-lab-boundary.test.ts tests/claude-integration/claude-native-passthrough.test.ts tests/claude-integration/claude-messages-endpoint.test.ts tests/claude-integration/messages-native.test.ts tests/claude-integration/messages-native-oauth.test.ts tests/claude-integration/messages-native-opaque-state.test.ts→ 193 pass, 0 fail.Directories.
bun test tests/claude-integration tests/usage→ 2124 pass, 1 fail. The failure isPOST /v1/messages?beta=true streams an Anthropic-shaped turn end to end, a translated route this does not touch. It fails the same way in a directory run of untoucheddevand passes alone (see fix(claude): end a passthrough stream on an upstream reset with an Anthropic error event #6235).File size.
claude-messages-endpoint.test.tsstays at 1990 lines: the A1/A2 changes are in place, and the new cases live in the sibling passthrough and managed-lane files.Gates.
bun x tsc --noEmit→ exit 0.bun run structure:check→ passed.bun run privacy:scan→ passed.Full suite (
bun run teston a Mac mini with the Codex app not running, at999713197): exit 1 after 643 s with 17 failures, none in this code.dev64294638aon the same machine:deferToNewerServiceRuntime(2) andturning Codex off.claude-management-api.test.ts(Claude Desktop apply/PUT) andclaude-models-discovery.test.ts(Codex discovery / selectors). They include 30 s timeouts, failed the same way in a loadeddevrun during fix(claude): end a passthrough stream on an upstream reset with an Anthropic error event #6235, and pass when rerun at97254b530:bun test tests/claude-integration/claude-management-api.test.ts tests/claude-integration/claude-models-discovery.test.ts tests/claude-integration/claude-native-passthrough.test.ts tests/claude-integration/messages-native.test.ts tests/claude-integration/claude-messages-endpoint.test.ts→ 203 pass, 0 fail.Checklist
Review readiness checklist
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Required local validation passed; commands, results, and any full-suite exception are documented.
I pushed my PR to a recent dev commit (at most 10 behind; a maintainer may still ask for the exact tip before merge).
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