Files
OmniRoute/tests/unit
Chirag Singhal d256fc367a fix(sse): stop combo path tripping whole-provider breaker on plain 429 (#6868)
* fix(sse): stop combo path tripping whole-provider breaker on plain 429

The combo path recorded a whole-provider circuit-breaker failure for a
plain rate-limit 429, opening the breaker after N consecutive 429s and
blocking every account+model on that provider. This contradicts the
single-model path and the documented RESILIENCE_GUIDE policy.

- Single-model path uses PROVIDER_BREAKER_FAILURE_STATUSES =
  Set([408, 500, 502, 503, 504]) (src/sse/handlers/chat.ts:206) — 429 excluded.
- Combo path gated shouldRecordProviderBreakerFailure on isProviderFailureCode
  (accountFallback.ts), whose PROVIDER_FAILURE_ERROR_CODES INCLUDES 429 for
  connection-cooldown scope — so a plain 429 wrongly tripped the whole-provider
  breaker.

Fix scopes tightly: comboPredicates now tests a local
PROVIDER_BREAKER_FAILURE_STATUSES set mirroring the single-model constant
(429 excluded), instead of isProviderFailureCode. The shared
isProviderFailureCode / PROVIDER_FAILURE_ERROR_CODES are deliberately left
untouched — they drive connection-cooldown / model-lockout logic where 429
must still count. A genuine quota/token-limit terminal 429 is handled
elsewhere; only the whole-provider breaker-recording gate changes.

Adds tests/unit/combo-breaker-429.test.ts covering the 429 exclusion,
the 408/5xx inclusion, and the sameProviderNext / skipProviderBreaker
suppression paths.

* test(quality): register combo-breaker-429.test.ts in stryker tap.testFiles

Fast Quality Gates' mutation-coverage drift check flagged this PR's new
covering test for comboPredicates.ts as unregistered.

Co-authored-by: Chirag Singhal <chirag127@users.noreply.github.com>

---------

Co-authored-by: Chirag Singhal <chirag127@users.noreply.github.com>
Co-authored-by: Diego Rodrigues de Sa e Souza <diegosouza.pw@gmail.com>
Co-authored-by: Diego Rodrigues de Sa e Souza <8016841+diegosouzapw@users.noreply.github.com>
2026-07-12 01:59:09 -03:00
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