feat: cc/codex/gemini 增加账号重试

backend/internal/handler/gateway_handler.go

@@ -129,56 +129,80 @@ func (h *GatewayHandler) Messages(c *gin.Context) {
 	}
 
 	if platform == service.PlatformGemini {
-		account, err := h.geminiCompatService.SelectAccountForModel(c.Request.Context(), apiKey.GroupID, sessionHash, req.Model)
-		if err != nil {
-			h.handleStreamingAwareError(c, http.StatusServiceUnavailable, "api_error", "No available accounts: "+err.Error(), streamStarted)
-			return
-		}
+		const maxAccountSwitches = 3
+		switchCount := 0
+		failedAccountIDs := make(map[int64]struct{})
+		lastFailoverStatus := 0
+
+		for {
+			account, err := h.geminiCompatService.SelectAccountForModelWithExclusions(c.Request.Context(), apiKey.GroupID, sessionHash, req.Model, failedAccountIDs)
+			if err != nil {
+				if len(failedAccountIDs) == 0 {
+					h.handleStreamingAwareError(c, http.StatusServiceUnavailable, "api_error", "No available accounts: "+err.Error(), streamStarted)
+					return
+				}
+				h.handleFailoverExhausted(c, lastFailoverStatus, streamStarted)
+				return
+			}
 
-		// 检查预热请求拦截（在账号选择后、转发前检查）
-		if account.IsInterceptWarmupEnabled() && isWarmupRequest(body) {
-			if req.Stream {
-				sendMockWarmupStream(c, req.Model)
-			} else {
-				sendMockWarmupResponse(c, req.Model)
+			// 检查预热请求拦截（在账号选择后、转发前检查）
+			if account.IsInterceptWarmupEnabled() && isWarmupRequest(body) {
+				if req.Stream {
+					sendMockWarmupStream(c, req.Model)
+				} else {
+					sendMockWarmupResponse(c, req.Model)
+				}
+				return
 			}
-			return
-		}
 
-		// 3. 获取账号并发槽位
-		accountReleaseFunc, err := h.concurrencyHelper.AcquireAccountSlotWithWait(c, account.ID, account.Concurrency, req.Stream, &streamStarted)
-		if err != nil {
-			log.Printf("Account concurrency acquire failed: %v", err)
-			h.handleConcurrencyError(c, err, "account", streamStarted)
-			return
-		}
-		if accountReleaseFunc != nil {
-			defer accountReleaseFunc()
-		}
+			// 3. 获取账号并发槽位
+			accountReleaseFunc, err := h.concurrencyHelper.AcquireAccountSlotWithWait(c, account.ID, account.Concurrency, req.Stream, &streamStarted)
+			if err != nil {
+				log.Printf("Account concurrency acquire failed: %v", err)
+				h.handleConcurrencyError(c, err, "account", streamStarted)
+				return
+			}
 
-		// 转发请求
-		result, err := h.geminiCompatService.Forward(c.Request.Context(), c, account, body)
-		if err != nil {
-			// 错误响应已在Forward中处理，这里只记录日志
-			log.Printf("Forward request failed: %v", err)
+			// 转发请求
+			result, err := h.geminiCompatService.Forward(c.Request.Context(), c, account, body)
+			if accountReleaseFunc != nil {
+				accountReleaseFunc()
+			}
+			if err != nil {
+				var failoverErr *service.UpstreamFailoverError
+				if errors.As(err, &failoverErr) {
+					failedAccountIDs[account.ID] = struct{}{}
+					if switchCount >= maxAccountSwitches {
+						lastFailoverStatus = failoverErr.StatusCode
+						h.handleFailoverExhausted(c, lastFailoverStatus, streamStarted)
+						return
+					}
+					lastFailoverStatus = failoverErr.StatusCode
+					switchCount++
+					log.Printf("Account %d: upstream error %d, switching account %d/%d", account.ID, failoverErr.StatusCode, switchCount, maxAccountSwitches)
+					continue
+				}
+				// 错误响应已在Forward中处理，这里只记录日志
+				log.Printf("Forward request failed: %v", err)
+				return
+			}
+
+			// 异步记录使用量（subscription已在函数开头获取）
+			go func(result *service.ForwardResult, usedAccount *service.Account) {
+				ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+				defer cancel()
+				if err := h.gatewayService.RecordUsage(ctx, &service.RecordUsageInput{
+					Result:       result,
+					ApiKey:       apiKey,
+					User:         apiKey.User,
+					Account:      usedAccount,
+					Subscription: subscription,
+				}); err != nil {
+					log.Printf("Record usage failed: %v", err)
+				}
+			}(result, account)
 			return
 		}
-
-		// 异步记录使用量（subscription已在函数开头获取）
-		go func(result *service.ForwardResult, usedAccount *service.Account) {
-			ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
-			defer cancel()
-			if err := h.gatewayService.RecordUsage(ctx, &service.RecordUsageInput{
-				Result:       result,
-				ApiKey:       apiKey,
-				User:         apiKey.User,
-				Account:      usedAccount,
-				Subscription: subscription,
-			}); err != nil {
-				log.Printf("Record usage failed: %v", err)
-			}
-		}(result, account)
-		return
 	}
 
 	const maxAccountSwitches = 3

backend/internal/handler/gemini_v1beta_handler.go

@@ -2,6 +2,7 @@ package handler
 
 import (
 	"context"
+	"errors"
 	"io"
 	"log"
 	"net/http"
@@ -158,44 +159,69 @@ func (h *GatewayHandler) GeminiV1BetaModels(c *gin.Context) {
 
 	// 3) select account (sticky session based on request body)
 	sessionHash := h.gatewayService.GenerateSessionHash(body)
-	account, err := h.geminiCompatService.SelectAccountForModel(c.Request.Context(), apiKey.GroupID, sessionHash, modelName)
-	if err != nil {
-		googleError(c, http.StatusServiceUnavailable, "No available Gemini accounts: "+err.Error())
-		return
-	}
+	const maxAccountSwitches = 3
+	switchCount := 0
+	failedAccountIDs := make(map[int64]struct{})
+	lastFailoverStatus := 0
+
+	for {
+		account, err := h.geminiCompatService.SelectAccountForModelWithExclusions(c.Request.Context(), apiKey.GroupID, sessionHash, modelName, failedAccountIDs)
+		if err != nil {
+			if len(failedAccountIDs) == 0 {
+				googleError(c, http.StatusServiceUnavailable, "No available Gemini accounts: "+err.Error())
+				return
+			}
+			handleGeminiFailoverExhausted(c, lastFailoverStatus)
+			return
+		}
 
-	// 4) account concurrency slot
-	accountReleaseFunc, err := geminiConcurrency.AcquireAccountSlotWithWait(c, account.ID, account.Concurrency, stream, &streamStarted)
-	if err != nil {
-		googleError(c, http.StatusTooManyRequests, err.Error())
-		return
-	}
-	if accountReleaseFunc != nil {
-		defer accountReleaseFunc()
-	}
+		// 4) account concurrency slot
+		accountReleaseFunc, err := geminiConcurrency.AcquireAccountSlotWithWait(c, account.ID, account.Concurrency, stream, &streamStarted)
+		if err != nil {
+			googleError(c, http.StatusTooManyRequests, err.Error())
+			return
+		}
 
-	// 5) forward (writes response to client)
-	result, err := h.geminiCompatService.ForwardNative(c.Request.Context(), c, account, modelName, action, stream, body)
-	if err != nil {
-		// ForwardNative already wrote the response
-		log.Printf("Gemini native forward failed: %v", err)
+		// 5) forward (writes response to client)
+		result, err := h.geminiCompatService.ForwardNative(c.Request.Context(), c, account, modelName, action, stream, body)
+		if accountReleaseFunc != nil {
+			accountReleaseFunc()
+		}
+		if err != nil {
+			var failoverErr *service.UpstreamFailoverError
+			if errors.As(err, &failoverErr) {
+				failedAccountIDs[account.ID] = struct{}{}
+				if switchCount >= maxAccountSwitches {
+					lastFailoverStatus = failoverErr.StatusCode
+					handleGeminiFailoverExhausted(c, lastFailoverStatus)
+					return
+				}
+				lastFailoverStatus = failoverErr.StatusCode
+				switchCount++
+				log.Printf("Gemini account %d: upstream error %d, switching account %d/%d", account.ID, failoverErr.StatusCode, switchCount, maxAccountSwitches)
+				continue
+			}
+			// ForwardNative already wrote the response
+			log.Printf("Gemini native forward failed: %v", err)
+			return
+		}
+
+		// 6) record usage async
+		go func(result *service.ForwardResult, usedAccount *service.Account) {
+			ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+			defer cancel()
+			if err := h.gatewayService.RecordUsage(ctx, &service.RecordUsageInput{
+				Result:       result,
+				ApiKey:       apiKey,
+				User:         apiKey.User,
+				Account:      usedAccount,
+				Subscription: subscription,
+			}); err != nil {
+				log.Printf("Record usage failed: %v", err)
+			}
+		}(result, account)
 		return
 	}
-
-	// 6) record usage async
-	go func() {
-		ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
-		defer cancel()
-		if err := h.gatewayService.RecordUsage(ctx, &service.RecordUsageInput{
-			Result:       result,
-			ApiKey:       apiKey,
-			User:         apiKey.User,
-			Account:      account,
-			Subscription: subscription,
-		}); err != nil {
-			log.Printf("Record usage failed: %v", err)
-		}
-	}()
 }
 
 func parseGeminiModelAction(rest string) (model string, action string, err error) {
@@ -217,6 +243,28 @@ func parseGeminiModelAction(rest string) (model string, action string, err error
 	return "", "", &pathParseError{"invalid model action path"}
 }
 
+func handleGeminiFailoverExhausted(c *gin.Context, statusCode int) {
+	status, message := mapGeminiUpstreamError(statusCode)
+	googleError(c, status, message)
+}
+
+func mapGeminiUpstreamError(statusCode int) (int, string) {
+	switch statusCode {
+	case 401:
+		return http.StatusBadGateway, "Upstream authentication failed, please contact administrator"
+	case 403:
+		return http.StatusBadGateway, "Upstream access forbidden, please contact administrator"
+	case 429:
+		return http.StatusTooManyRequests, "Upstream rate limit exceeded, please retry later"
+	case 529:
+		return http.StatusServiceUnavailable, "Upstream service overloaded, please retry later"
+	case 500, 502, 503, 504:
+		return http.StatusBadGateway, "Upstream service temporarily unavailable"
+	default:
+		return http.StatusBadGateway, "Upstream request failed"
+	}
+}
+
 type pathParseError struct{ msg string }
 
 func (e *pathParseError) Error() string { return e.msg }

backend/internal/service/gemini_messages_compat_service.go

@@ -62,14 +62,20 @@ func (s *GeminiMessagesCompatService) GetTokenProvider() *GeminiTokenProvider {
 }
 
 func (s *GeminiMessagesCompatService) SelectAccountForModel(ctx context.Context, groupID *int64, sessionHash string, requestedModel string) (*Account, error) {
+	return s.SelectAccountForModelWithExclusions(ctx, groupID, sessionHash, requestedModel, nil)
+}
+
+func (s *GeminiMessagesCompatService) SelectAccountForModelWithExclusions(ctx context.Context, groupID *int64, sessionHash string, requestedModel string, excludedIDs map[int64]struct{}) (*Account, error) {
 	cacheKey := "gemini:" + sessionHash
 	if sessionHash != "" {
 		accountID, err := s.cache.GetSessionAccountID(ctx, cacheKey)
 		if err == nil && accountID > 0 {
-			account, err := s.accountRepo.GetByID(ctx, accountID)
-			if err == nil && account.IsSchedulable() && account.Platform == PlatformGemini && (requestedModel == "" || account.IsModelSupported(requestedModel)) {
-				_ = s.cache.RefreshSessionTTL(ctx, cacheKey, geminiStickySessionTTL)
-				return account, nil
+			if _, excluded := excludedIDs[accountID]; !excluded {
+				account, err := s.accountRepo.GetByID(ctx, accountID)
+				if err == nil && account.IsSchedulable() && account.Platform == PlatformGemini && (requestedModel == "" || account.IsModelSupported(requestedModel)) {
+					_ = s.cache.RefreshSessionTTL(ctx, cacheKey, geminiStickySessionTTL)
+					return account, nil
+				}
 			}
 		}
 	}
@@ -88,6 +94,9 @@ func (s *GeminiMessagesCompatService) SelectAccountForModel(ctx context.Context,
 	var selected *Account
 	for i := range accounts {
 		acc := &accounts[i]
+		if _, excluded := excludedIDs[acc.ID]; excluded {
+			continue
+		}
 		if requestedModel != "" && !acc.IsModelSupported(requestedModel) {
 			continue
 		}
@@ -425,6 +434,9 @@ func (s *GeminiMessagesCompatService) Forward(ctx context.Context, c *gin.Contex
 	if resp.StatusCode >= 400 {
 		respBody, _ := io.ReadAll(io.LimitReader(resp.Body, 2<<20))
 		s.handleGeminiUpstreamError(ctx, account, resp.StatusCode, resp.Header, respBody)
+		if s.shouldFailoverGeminiUpstreamError(resp.StatusCode) {
+			return nil, &UpstreamFailoverError{StatusCode: resp.StatusCode}
+		}
 		return nil, s.writeGeminiMappedError(c, resp.StatusCode, respBody)
 	}
 
@@ -724,6 +736,10 @@ func (s *GeminiMessagesCompatService) ForwardNative(ctx context.Context, c *gin.
 			}, nil
 		}
 
+		if s.shouldFailoverGeminiUpstreamError(resp.StatusCode) {
+			return nil, &UpstreamFailoverError{StatusCode: resp.StatusCode}
+		}
+
 		respBody = unwrapIfNeeded(isOAuth, respBody)
 		contentType := resp.Header.Get("Content-Type")
 		if contentType == "" {
@@ -795,6 +811,15 @@ func (s *GeminiMessagesCompatService) shouldRetryGeminiUpstreamError(account *Ac
 	}
 }
 
+func (s *GeminiMessagesCompatService) shouldFailoverGeminiUpstreamError(statusCode int) bool {
+	switch statusCode {
+	case 401, 403, 429, 529:
+		return true
+	default:
+		return statusCode >= 500
+	}
+}
+
 func sleepGeminiBackoff(attempt int) {
 	delay := geminiRetryBaseDelay * time.Duration(1<<uint(attempt-1))
 	if delay > geminiRetryMaxDelay {