fix: raw hold-cap 128x, full monitor-mode output scans, and a usage event for every request - #1238
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OpenAI streams of CJK output frame at 74-75x their generated content on both Chat Completions and Responses. On the routes that count the upstream's own bytes (native /v1/responses, passthrough routes, native /v1/messages) the 64x raw bound therefore tripped at about 86% of the configured max_buffer_bytes, contradicting the rule that the cap counts generated content. At 128x the content cap binds again. Worst-case memory per held stream at the default 256 KiB goes from 16 MiB to 32 MiB.
… text A monitor-only output chain (EndOfStreamCheck) holds nothing back, yet several streamed routes silently cut its end-of-stream scan at 256 KiB: native /v1/responses and streamed audio transcription (EosOutputScan and the accumulators feeding it), the /v1/responses chat bridge's live-mode scan, and the chat tool-call text on /v1/chat/completions. A monitor rule whose trigger arrived past that point was never recorded. Every route now scans the whole generated text, as chat body text and native /v1/messages already did. Only generated text is accumulated; the chat route's raw tool-call deltas stay bounded, and past that bound the local kinds judge the tool-call text instead.
… arguments In window mode the chat route holds streamed tool-call arguments whole and caps them with the chain's folded max_buffer_bytes; the field description named only the whole-stream holds on /v1/messages and /v1/responses. Schemas regenerated.
A usage event is the observability record of a request, and the console Logs and budgets read nothing else. Several endpoints still skipped it when there was nothing to bill: - /v1/rerank emitted only when the upstream reported a token count. A live Cohere rerank-v3.5 call reports meta.billed_units.search_units and no input_tokens, so every real Cohere rerank was missing from Logs and budgets. - /v1/completions, /v1/embeddings, /v1/images/generations and POST /v1/videos skipped the event when the gateway answered 501 itself because the provider lacks the capability. Each now emits, at zero tokens when the upstream reported none. The rule is stated on usage_attr::emit_usage, the emission chokepoint. No search-unit pricing is added.
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Included review availability: Your plan provides up to 5 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe changes expand end-of-stream guardrail scans beyond prior text caps and adjust bounded collection for streamed tool-call arguments. They document related buffer limits. Covered request paths also emit usage events when token counts are missing, for unsupported-provider responses, or after a specified MCP response-read failure. ChangesStreaming guardrail buffering and scans
Usage events for dispatched requests
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Merge Risk: ⚪ Minimal · up to The checked video-submit behavior preserves usage reporting without falsely recording an upstream call. No identified issue prevents merging after normal checks. 🚥 Pre-merge checks | ✅ 5 | ❌ 1❌ Failed checks (1 warning)
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Full details: E2e Test Quality ReviewExplanation The E2E coverage is incomplete for the usage-event change. The PR changes Resolution Add an E2E image-generation case that reaches the unsupported capability, asserts the 501 response, and verifies the
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When a guardrail or content capture makes /mcp read the tool result back and that read fails (the result outgrows the body cap, or the body is broken), the gateway answered 502 without a usage event, although the call had reached the upstream. It now emits the same tool-call event every other exit does, with status 502. Video job polling (GET /v1/videos/:id) and content retrieval deliberately emit no usage event; the emission rule now says so.
The #1029 passthrough fixture carried a 100 KB content-free tail, past the old 64x raw bound of its 1 000-byte cap but under the new 128x one, so it no longer tripped. It now carries 200 KB.
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In `@crates/aisix-proxy/src/videos.rs`:
- Around line 1656-1658: Restore `CreateSuccess.upstream_called` and pass it
through the submit success path to `emit_submit_usage_event`, which should
forward it to `emit_usage` instead of hard-coding dispatched as true. Set it
false for both 501 paths in `dispatch_create` and `Submitted::Unsupported`, and
true when the submit reaches upstream.
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crates/aisix-core/src/models/guardrail.rscrates/aisix-proxy/src/audio.rscrates/aisix-proxy/src/chat.rscrates/aisix-proxy/src/completions.rscrates/aisix-proxy/src/embeddings.rscrates/aisix-proxy/src/guardrail_stream.rscrates/aisix-proxy/src/held_content.rscrates/aisix-proxy/src/images.rscrates/aisix-proxy/src/mcp.rscrates/aisix-proxy/src/rerank.rscrates/aisix-proxy/src/responses.rscrates/aisix-proxy/src/responses_bridge.rscrates/aisix-proxy/src/usage_attr.rscrates/aisix-proxy/src/videos.rsschemas/resources-lenient/guardrail.schema.jsonschemas/resources/guardrail.schema.jsontests/e2e/src/cases/guardrail-buffer-cap-enforced-hit-e2e.test.tstests/e2e/src/cases/guardrail-monitor-full-output-scan-e2e.test.tstests/e2e/src/cases/stream-output-raw-hold-cap-e2e.test.tstests/e2e/src/cases/usage-event-every-request-e2e.test.ts
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The unsupported-provider 501 on POST /v1/videos now emits a usage event, but emit_submit_usage_event hard-coded dispatched=true, so the 501 exported an upstream CLIENT span for a call that never happened. Restore CreateSuccess.upstream_called and pass it through, as completions, embeddings and images already do.
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Four small, independent fixes: two in streamed output guardrails, one schema description, and usage events for requests with nothing to bill.
Raw hold-cap factor 64 → 128.
max_buffer_bytescounts generated content, but a hold-back also bounds the raw bytes it keeps, at a multiple of that cap. OpenAI streams with Chinese output frame at 74–75× their generated content, on Chat Completions and Responses alike. So on the routes that measure the upstream's own frames (native/v1/responses, passthrough routes, native/v1/messages) the 64× raw bound tripped at about 86% of the configured cap, before the content cap was ever reached. At 128× the content cap binds again. Worst-case memory per held stream at the default 256 KiB goes from 16 MiB to 32 MiB. The defaultmax_buffer_bytes(262144) is unchanged.Monitor-only output chains scan all of the generated text. A monitor-only chain never holds a stream back, yet some routes cut its end-of-stream scan at 256 KiB, so a monitor rule whose trigger arrived later was never recorded. The truncating sites were:
EosOutputScan::observe, plus the accumulators that feed it on native/v1/responsesand streamed audio transcription;/v1/responseschat bridge's live-mode scan;/v1/chat/completions.All of them now scan the whole text, as chat body text and native
/v1/messagesalready did. Only generated text is accumulated. The chat route's raw tool-call deltas, which the local kinds (keyword, pii) read, stay bounded; past that bound those kinds judge the tool-call text instead. I also checked passthrough routes, a2a, realtime, jobs and completions: none truncates a monitor scan. Hold-back behavior (window/buffer_full) and the hold caps are unchanged.max_buffer_bytesdescription. Inwindowmode the chat route also holds streamed tool-call arguments whole under the chain's foldedmax_buffer_bytes; the description now says so. Schemas regenerated.Every model-serving request emits its UsageEvent. The console Logs and budgets read only usage events, and several endpoints still skipped them when there was nothing to bill:
/v1/rerankemitted only when the upstream reported a token count. Coherererank-v3.5returns"meta":{"api_version":{"version":"2"},"billed_units":{"search_units":1}}with noinput_tokens, so every real Cohere rerank was missing from Logs and budgets./v1/completions,/v1/embeddings,/v1/images/generationsandPOST /v1/videosskipped it when the gateway itself answered 501 because the provider lacks the capability./mcpskipped it when a guardrail or content capture made the gateway read the tool result back and that read failed (the result outgrew the body cap, or the body was broken): the caller got a 502 after the tool call had already reached the upstream.Each now emits, with zero tokens when none were reported.
input_tokensis still read when Cohere sends it. There is no search-unit pricing and no new field. Error paths already emitted their zero-token events and are unchanged. The rule is now stated onusage_attr::emit_usage, the emission chokepoint, together with its one deliberate exception: polling a video job (GET /v1/videos/:id) and retrieving its content emit no event. The tests that pinned the old skip are inverted.Behavior changes after upgrading, with no configuration edits needed:
on_buffer_exceededearly.Tests: DP e2e covers each item and fails without its fix.
stream-output-raw-hold-capadds content-at-cap streams framed at ~100× on native/v1/responses, native/v1/messagesand a passthrough route.guardrail-monitor-full-output-scanputs a monitor trigger after 275 KB on native and bridged/v1/responses, chat tool-call arguments, chat content, native/v1/messagesand streamed transcription.usage-event-every-requestcovers the Cohere rerank shape, the 501 refusals and the MCP 502.🤖 Generated with Claude Code
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