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cc-switch/src-tauri
Jason 1b73b26c0e fix(proxy): resolve circuit breaker race condition and error classification
This commit addresses two critical issues in the proxy failover logic:

1. Circuit Breaker HalfOpen Concurrency Bug:
   - Introduced `AllowResult` struct to track half-open permit usage
   - Added state guard in `transition_to_half_open()` to prevent duplicate resets
   - Replaced `fetch_sub` with CAS loop in `release_half_open_permit()` to prevent underflow
   - Separated `is_available()` (routing) from `allow_request()` (permit acquisition)

2. Error Classification Conflation:
   - Split retry logic into `should_retry_same_provider()` and `categorize_proxy_error()`
   - Same-provider retry: only for transient errors (timeout, 429, 5xx)
   - Cross-provider failover: now includes ConfigError, TransformError, AuthError
   - 4xx errors (401/403) no longer waste retries on the same provider
2025-12-17 09:36:17 +08:00
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2025-12-05 11:26:41 +08:00
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