fix(telemetry): write a streamed request's access-log line when the stream ends, not when its head does - #1192
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…tream ends, not when its head does A streaming handler returns the moment the response head exists — often minutes before the request ends — and it wrote the request's access-log line there. So a stream the caller abandoned logged `200` beside its own `499` usage event, a delivered stream's line carried neither the token counts nor the provider response id, and one request read as two records under two statuses. Six families did this: chat, messages, responses, audio's two transcription routes, and a2a. Passthrough already wrote its line at the stream's end and is the shape the others now follow. A streaming handler no longer writes the line at all. It parks the fields only it can resolve on the request's attribution cell (`attribution::PendingAccessLog`), and the line goes out from `usage_attr::emit_usage` with the request's TERMINAL usage event — whichever of the stream's three endings produced it: delivered, abandoned mid-flight, or dropped before its first poll. Taking the parked line out of the cell is also the interlock, so however many terminal emitters race, exactly one line is written. The line and the row therefore agree on `status`, `error_class` and `error_message` by construction rather than by each family remembering to, and the streamed line now carries the counts and `provider_request_id` that only exist once the upstream has answered. Two supporting changes make that reachable: the response body is polled inside the request's attribution scope (the delivered ending runs there), and the cancel guard installs the cell around its own emit (the two abandoned endings run from `Drop`, outside every scope). Every access-log line also gains `duration_ms`, how long the request occupied the gateway. `latency_ms` keeps its meaning — what the CALLER waited for, time-to-first-token on a stream (AISIX-Cloud#1394) — so the two differ by the length of the stream and coincide on everything buffered. Passthrough's streamed line now reports its first relayed frame in `latency_ms` for the same reason, instead of the whole relay. `/v1/completions` refuses `stream: true`, so it only gains the new field. `/v1/audio/speech` relays bytes but meters at its tail, so it keeps writing its line there. On `/a2a` and the audio transcription relay, `latency_ms` equals the whole-stream figure their usage event already reports as the caller's wait; reporting a time-to-first-frame there would mean changing what `downstream_latency_ms` means, which this does not touch. Ref api7/AISIX-Cloud#1571
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Included review availability: Your plan provides up to 5 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe change adds separate access-log latency and duration fields. Streaming requests now defer access-log emission until terminal usage events, including cancellation and abandoned streams. Proxy endpoints and shared tests adopt and verify this behavior. ChangesStreaming access-log attribution
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant Client
participant StreamingEndpoint
participant RequestAttribution
participant UsageEmitter
participant AccessLog
Client->>StreamingEndpoint: start streaming request
StreamingEndpoint->>RequestAttribution: park access log
StreamingEndpoint-->>Client: stream response frames
Client->>StreamingEndpoint: complete or abandon stream
UsageEmitter->>RequestAttribution: finalize terminal usage event
RequestAttribution->>AccessLog: emit one deferred access-log line
Suggested reviewers: Merge Risk: ⚪ Minimal · up to The telemetry changes have no identified merge-blocking risk in the reviewed scope. 🚥 Pre-merge checks | ✅ 5 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (5 passed)
Full details: E2e Test Quality ReviewExplanation The PR adds valid end-to-end coverage for the binary, etcd configuration, mock upstreams, and SLS usage records. Rust tests also cover delivered, mid-stream abandoned, and unread endings across the affected families. However, the new mid-stream E2E test reads Resolution Poll for the access-log line for the exact ✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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…response id The line is written at the stream's end now, so the claim this spec was built on — that the id lands after the request's access-log line — no longer holds. Assert the line carries it, and keep the per-attempt line for what only it can say: one row per provider call of a retried or failed-over request. Ref api7/AISIX-Cloud#1571
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In `@crates/aisix-proxy/src/test_log.rs`:
- Around line 172-175: Update the stream-ending checks around body.next() so
both the initial frame assertion and the subsequent drain reject axum::Error
values rather than treating Some(Err(_)) as successful delivery. Preserve the
existing timing and exhaustion behavior while explicitly asserting each yielded
item is Ok.
In `@tests/e2e/src/cases/client-cancel-usage-1571-e2e.test.ts`:
- Line 406: Update the reader cancellation cleanup around reader.cancel() so it
tolerates only the expected fetch-body AbortError after controller.abort(),
while propagating any other cancellation failure; preserve the successful
cancellation path when reader.cancel() resolves.
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crates/aisix-obs/src/access_log.rscrates/aisix-proxy/AGENTS.mdcrates/aisix-proxy/src/a2a.rscrates/aisix-proxy/src/attribution.rscrates/aisix-proxy/src/audio.rscrates/aisix-proxy/src/cancel.rscrates/aisix-proxy/src/chat.rscrates/aisix-proxy/src/completions.rscrates/aisix-proxy/src/count_tokens.rscrates/aisix-proxy/src/embeddings.rscrates/aisix-proxy/src/images.rscrates/aisix-proxy/src/jobs.rscrates/aisix-proxy/src/lib.rscrates/aisix-proxy/src/mcp.rscrates/aisix-proxy/src/messages.rscrates/aisix-proxy/src/passthrough_route.rscrates/aisix-proxy/src/realtime.rscrates/aisix-proxy/src/reject.rscrates/aisix-proxy/src/rerank.rscrates/aisix-proxy/src/responses.rscrates/aisix-proxy/src/test_log.rscrates/aisix-proxy/src/usage_attr.rscrates/aisix-proxy/src/videos.rstests/e2e/src/cases/client-cancel-usage-1571-e2e.test.ts
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…d take the caller's wait verbatim
Three review findings on the deferred access-log line, all in what the line
reports rather than where it is written.
`total_tokens` summed only the two visible columns. `prompt_tokens` excludes
`cache_creation_tokens` and `cache_read_tokens` on the Anthropic-shaped
paths, so a streamed call with prompt caching logged a total an order of
magnitude under the row it was emitted beside — 89 against 102 in the test
that now pins it. It uses `total_tokens_with_cache`, like every other total
in the crate.
`latency` treated `downstream_latency_ms == 0` as "never stamped" and fell
back to the whole request. It is also a real value: the field is truncated
milliseconds, so a co-located upstream whose first frame lands in under a
millisecond stamps `0` — and the line would then report the length of the
stream as the caller's wait, the exact AISIX-Cloud#1394 misreading. The
figure is now taken verbatim off the event, so the line and the row cannot
report two different waits.
`duration`'s doc claimed "arrival to last byte out" everywhere. That holds
wherever the line is written at completion, but `/v1/audio/speech` and
`/v1/videos/{id}/content` meter at their handler tail and relay an
open-ended body afterwards; theirs ends at the response head. The field says
so.
Also: `/v1/messages` and `/v1/responses` conjoin their own streaming flag
before parking a line, the way chat already does, so reusing
`usage_handled_by_stream` to mean "already emitted" on a buffered path
cannot silently lose a line. The audio tails have no second predicate — the
flag there means the response IS a live relay — and say so.
Review (CodeRabbit): the stream-ending driver treated `Some(Err(_))` as a
delivered frame, so a body that broke on its first poll would have passed as
the delivered ending; and the e2e swallowed every `reader.cancel()`
rejection rather than just the abort's own.
Ref api7/AISIX-Cloud#1571
…ond one beside it A streaming family parks its access-log line at its handler tail and chat then awaits once more — peeking the rate limiter to fill the `x-ratelimit-*` headers. A caller that hangs up in that window leaves the guard in its HEAD phase with the request's line already on the cell, so both emitters spoke: the guard built its own `499` line and `cancel::emit` then wrote the parked one under the same status and the same message. One request read as two near-identical records, and counting `499` lines doubled it. The head phase now stands down when a line is parked. The parked one is the fuller of the two — it names the model, the dispatched target and the routing counts — and it cannot fall between the two emitters: a parked line means the request authenticated on a metering surface, which is the gate `cancel::emit` applies before emitting the terminal event that carries it. Found by review; the window is reachable today on `/v1/chat/completions` with a Redis rate-limit backend, where the peek is a real round trip. Ref api7/AISIX-Cloud#1571
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A streaming handler returns the moment the response head exists — often minutes before the request ends — and it wrote the request's access-log line right there. The consequences were all on the same line: a stream the caller abandoned logged
200beside its own499usage event, a delivered stream's line carried neither the token counts nor the provider response id, and one request read as two records under two statuses.Six families did this:
/v1/chat/completions,/v1/messages,/v1/responses, the two audio transcription routes, and/a2a. Passthrough already wrote its line at the stream's end, and is the shape the others now follow.What changed
A streaming handler no longer writes the line at all. It parks the fields only it can resolve on the request's attribution cell (
attribution::PendingAccessLog), and the line goes out fromusage_attr::emit_usagewith the request's terminal usage event — whichever of the stream's three endings produced it:error_message…while the response was streaming…before the response body was streamedTaking the parked line out of the cell is also the interlock, so however many of a request's terminal emitters race, exactly one line is written. The line and the row now agree on
status,error_classanderror_messageby construction rather than by each family remembering to — and the streamed line carries the token counts,provider_request_id,upstream_modelandprovider_key_idthat only exist once the upstream has answered.Two supporting changes make the cell reachable from where the line is now written: the response body is polled inside the request's attribution scope (the delivered ending runs there), and the cancel guard installs the cell around its own emit (the two abandoned endings run from
Drop, outside every scope).duration_msEvery access-log line gains
duration_ms: how long the request occupied the gateway, arrival to last byte out.latency_mskeeps its meaning — what the caller waited for, time-to-first-token on a stream (AISIX-Cloud#1394) — so on a streamed line the two differ by the length of the stream, and on everything buffered they are the same number. Passthrough's streamed line now reports its first relayed frame inlatency_msfor the same reason, instead of the whole relay.The usage event's shape is unchanged, and no metric changed.
Scope notes
/v1/completionsrefusesstream: true, so it has no stream to defer to and only gains the new field./v1/audio/speechrelays bytes but meters at its own tail, so it keeps writing its line there — there is no later emitter to carry one./a2aand the audio transcription relay,latency_msequals the whole-stream figure their usage event already reports as the caller's wait. Reporting a time-to-first-frame there would mean changing whatdownstream_latency_msmeans on those two surfaces, which this does not touch.telemetry_handled_by_streamis not the same predicate as "the response is a stream" — chat's buffered ensemble sets it to mean "already emitted". The chat tail conjoinsreq.is_streaming(), or that request's line would be parked with nothing left to write it.Tests
Rust, per family (chat, messages, responses, audio, a2a), driving all three stream endings: exactly one line each, the status and failure class the request's usage event reports,
duration_ms >= latency_ms, and the target fields present on the abandoned endings. The chat case additionally compares the line against the usage event field by field./v1/completionspins the buffered regression: one line,duration_ms == latency_ms. The delivered ending holds the stream open after its first frame, so a line reporting the whole stream inlatency_mscannot pass.Mutation-checked: restoring the tail-time write turns the status assertions red on every streamed family; transposing the two duration fields turns three of the five red (audio's two figures are the same span by design, as above).
E2E: a streaming chat request abandoned mid-flight writes exactly one line for its
request_id,status=499/error_kind="client_disconnected", namingmodel,upstream_modelandprovider_key_id— and the mock-SLS row for the same request carries the same status and message.Fixes api7/AISIX-Cloud#1571
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