Files
sub2api/backend/internal/service
shentryandClaude Opus 5 7d38e67120 fix(openai): keep transient failure streak from resetting on sparse traffic
The account+model transient breaker reset its failure streak whenever the
gap since the previous failure exceeded a one-minute window. That made the
breaker's sensitivity a function of request rate rather than upstream
health: a gateway called less often than once a minute never advanced past
streak 1, where the cooldown is zero, so a consistently broken account was
never blocked. Every request re-selected it, paid a full upstream attempt,
and only then failed over to a healthy account.

Observed on a low-traffic deployment: two accounts returning 500 and 503
stayed in rotation indefinitely, logging `failure_streak: 1, cooldown_ms: 0`
on every request and adding ~750ms to each one before a working account was
reached.

The streak is already cleared on success — recordSuccess deletes the entry,
and every OpenAI handler reports the schedule result — so the time-based
reset is not needed to recover a healthy account. Keep a TTL purely to bound
the map for account+model pairs that stopped being used, and raise it well
above the cooldowns so it no longer doubles as a streak reset.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
2026-08-04 17:59:16 +08:00
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