fix(channel): ensure thread-safe polling with channel-specific lock

model/channel.go

@@ -112,6 +112,10 @@ func (channel *Channel) GetNextEnabledKey() (string, int, *types.NewAPIError) {
 		return "", 0, types.NewError(errors.New("no keys available"), types.ErrorCodeChannelNoAvailableKey)
 	}
 
+	lock := GetChannelPollingLock(channel.Id)
+	lock.Lock()
+	defer lock.Unlock()
+
 	statusList := channel.ChannelInfo.MultiKeyStatusList
 	// helper to get key status, default to enabled when missing
 	getStatus := func(idx int) int {
@@ -143,9 +147,6 @@ func (channel *Channel) GetNextEnabledKey() (string, int, *types.NewAPIError) {
 		return keys[selectedIdx], selectedIdx, nil
 	case constant.MultiKeyModePolling:
 		// Use channel-specific lock to ensure thread-safe polling
-		lock := GetChannelPollingLock(channel.Id)
-		lock.Lock()
-		defer lock.Unlock()
 
 		channelInfo, err := CacheGetChannelInfo(channel.Id)
 		if err != nil {