Handle malformed streams and enforce harness timeouts#2048
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ApprovabilityVerdict: Needs human review This PR introduces substantial changes to core interception infrastructure: new stream buffering/validation, request cancellation mechanics, blocking error generation tracking, and stream replay caching. The complexity of the async/concurrency changes and significant runtime behavior modifications warrant human review. You can customize Macroscope's approvability policy. Learn more. |
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Keep harness timeouts on their partial-scoring path.
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…ream-safety # Conflicts: # verifiers/v1/interception/server.py
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Overview
Preserve rollout integrity when streamed provider responses are malformed and when harnesses time out with model requests still running.
Stream failures
A provider stream can deliver bytes before the dialect parser knows whether it can assemble a valid trace turn. Parser failures now become a latched 502 model error, preventing later harness requests from clearing the original failure or continuing with a missing turn.
Timeout enforcement
Model request handlers are tracked per rollout. When the harness reaches its timeout, the rollout cancels and awaits those handlers so the upstream provider stream closes before finalization.
Impact
Malformed streams retain the original provider failure without committing partial turns, and timed-out rollouts no longer leave inference requests running beyond the harness lifetime.
Note
High Risk
Large rewrite of interception retry/streaming and graph-commit ordering; behavior changes for all harness SDK retries, streaming clients, and timeout paths in security-critical request routing.
Overview
Hardens rollout integrity when provider SSE is bad or the harness hits its deadline, and tightens retry/idempotency so identical requests are not always treated as replays.
Streaming no longer relays chunks live through a queue. The server buffers the upstream stream in a spooled file (with a 64 MiB cap), parses and validates before committing a trace turn, then delivers events—withholding the terminal boundary until after commit. Parser/size failures become a latched 502 (
blocking_error_generations) so later calls cannot clear the failure or commit a partial turn. Retries (x-stainless-retry-countor idempotency headers) can replay or coalesce via_StreamReplayand per-digest futures; parallel identical unkeyed ops return 400 ambiguous retry. Anthropic addsis_terminal_eventformessage_stopmarkers.Slots are a
Slotdataclass (base_url,secret,cancel). The server tracks per-slot handler tasks,cancel/releasetears them down and clears stream replay state; on harnessTimeoutError, rollout callsawait slot.cancel()before stopping the trace.Non-streaming retry coalescing moves from
last_request/last_responseon the session to inflight attempt lists plus the same generation guard so a sampled turn is not discarded by a concurrent aux failure.Reviewed by Cursor Bugbot for commit 5770005. Bugbot is set up for automated code reviews on this repo. Configure here.
Note
Handle malformed streams and enforce harness timeouts in interception server
_StreamReplaydataclass backed by aSpooledTemporaryFile.Slottuple with a frozen dataclass carryingbase_url,secret, and acancelcoroutine, allowing the rollout to cancel in-flight interception requests on harness timeout._MAX_STREAM_RESPONSE_BYTES), atomically committed before terminal events are emitted, and replayed exactly for idempotent retries; malformed or oversized streams return a 502 and invalidate concurrent requests.Slotis no longer a tuple — any code unpacking it as(base_url, secret)will break.Macroscope summarized 5770005.