Files
OmniRoute/tests/unit
Markus Hartung 52671130a7 fix(sse): fix stale provider-response summaries and broken conversation continuation
Two independent bugs found during further live verification of the
conversation-tracking feature:

1. (#9315) The dashboard's "Provider Response" panel showed a stale,
   incomplete snapshot for long streamed responses. Root cause:
   open-sse/utils/stream.ts reconstructed the summary from
   buildStreamSummaryFromEvents(providerPayloadCollector.getEvents(), ...)
   — but getEvents() only returns whatever survived the collector's
   maxEvents/maxBytes cap, so once a stream exceeded it (easy with a
   reasoning + tool-calling model), everything after the cutoff (final
   finish_reason, tool_calls, rest of reasoning_content, usage) was
   silently dropped from the reconstruction, even though the client
   actually received the correct, complete response.

   Fix: streamPayloadCollector.ts's per-format summary builders
   (buildOpenAISummary/buildResponsesSummary/buildClaudeSummary/
   buildGeminiSummary) are now also available as incremental reducers
   (createXReducer: ingest one chunk at a time, finalize at the end).
   createStructuredSSECollector accepts a format + fallbackModel and feeds
   the reducer on every push() — including chunks that get dropped from
   the retained event array once the cap is hit — via a new getSummary()
   method. stream.ts's 3 call sites now use collector.getSummary() instead
   of reconstructing from the (possibly truncated) getEvents().

2. Conversation continuation never actually worked for real agentic CLI
   traffic. Root cause: computeFingerprintHash/hashTurnsBounded anchored
   conversation identity partly on the system message's text — but real
   coding-agent CLIs (Claude Code, opencode, etc.) commonly regenerate the
   system prompt on every single request with live context (timestamp,
   cwd, git status...). That volatility alone broke both the fingerprint
   bucket lookup and the prefix-hash continuation check, so every request
   minted a brand new conversation id even though apiKeyId/model/toolNames
   and the actual user/assistant history were an unbroken, growing
   continuation. Confirmed live: 28 consecutive requests from one real,
   growing session, each recorded as its own turn_count=1 conversation —
   which is also why /dashboard/conversations appeared empty (nothing ever
   reached turn_count >= 2) and why an individual timeline/log entry only
   ever showed a single turn.

   Fix: both computeFingerprintHash's identity anchor and
   hashTurnsBounded's head/tail projection now exclude the system message
   entirely, so a regenerated-every-turn system prompt can no longer break
   continuation detection. New regression test reproduces the exact
   scenario (system prompt differs each turn, everything else constant)
   and confirms the second request is now recognized as a continuation.

Also fixed while touching hashTurnsBounded: an accidental stray control
character (SOH, 0x01) in the internal join() separator — cosmetic (any
consistent separator produces a valid hash) but worth cleaning up since it
was already being edited; no stored data depended on the old format since
the continuation bug meant turn_count never reached 2 in production.

Test plan:
- New TDD regression tests for both bugs (stream-payload-collector.test.ts,
  conversationTracker.test.ts), confirmed failing before the fix and
  passing after
- npm run typecheck:core / npm run lint — clean
- npm run test:unit — 26983 tests, 18 failures, all independently confirmed
  pre-existing on release/v3.8.50 (reproduced identically against the
  clean base commit)
- npm run test:vitest — 291/291 passed
- Rebuilt and redeployed to omniroute-dev; health check + DB migration
  verified
2026-08-05 11:14:11 +02:00
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