merge: 合并 main 分支解决冲突

backend/internal/pkg/antigravity/request_transformer.go

@@ -14,24 +14,15 @@ func TransformClaudeToGemini(claudeReq *ClaudeRequest, projectID, mappedModel st
 	// 用于存储 tool_use id -> name 映射
 	toolIDToName := make(map[string]string)
 
+	// 检测是否启用 thinking
+	isThinkingEnabled := claudeReq.Thinking != nil && claudeReq.Thinking.Type == "enabled"
+
 	// 只有 Gemini 模型支持 dummy thought workaround
 	// Claude 模型通过 Vertex/Google API 需要有效的 thought signatures
 	allowDummyThought := strings.HasPrefix(mappedModel, "gemini-")
 
-	// 检测是否启用 thinking
-	requestedThinkingEnabled := claudeReq.Thinking != nil && claudeReq.Thinking.Type == "enabled"
-	// antigravity(v1internal) 下，Gemini 与 Claude 的 “thinking” 都可能涉及 thoughtSignature 链路：
-	// - Gemini：支持 dummy signature 跳过校验
-	// - Claude：需要透传上游签名（否则容易 400）
-	isThinkingEnabled := requestedThinkingEnabled
-
-	thoughtSignatureMode := thoughtSignatureModePreserve
-	if allowDummyThought {
-		thoughtSignatureMode = thoughtSignatureModeDummy
-	}
-
 	// 1. 构建 contents
-	contents, err := buildContents(claudeReq.Messages, toolIDToName, isThinkingEnabled, thoughtSignatureMode)
+	contents, err := buildContents(claudeReq.Messages, toolIDToName, isThinkingEnabled, allowDummyThought)
 	if err != nil {
 		return nil, fmt.Errorf("build contents: %w", err)
 	}
@@ -129,7 +120,7 @@ func buildSystemInstruction(system json.RawMessage, modelName string) *GeminiCon
 }
 
 // buildContents 构建 contents
-func buildContents(messages []ClaudeMessage, toolIDToName map[string]string, isThinkingEnabled bool, thoughtSignatureMode thoughtSignatureMode) ([]GeminiContent, error) {
+func buildContents(messages []ClaudeMessage, toolIDToName map[string]string, isThinkingEnabled, allowDummyThought bool) ([]GeminiContent, error) {
 	var contents []GeminiContent
 
 	for i, msg := range messages {
@@ -138,30 +129,23 @@ func buildContents(messages []ClaudeMessage, toolIDToName map[string]string, isT
 			role = "model"
 		}
 
-		parts, err := buildParts(msg.Content, toolIDToName, thoughtSignatureMode)
+		parts, err := buildParts(msg.Content, toolIDToName, allowDummyThought)
 		if err != nil {
 			return nil, fmt.Errorf("build parts for message %d: %w", i, err)
 		}
 
-		allowDummyThought := thoughtSignatureMode == thoughtSignatureModeDummy
-
 		// 只有 Gemini 模型支持 dummy thinking block workaround
 		// 只对最后一条 assistant 消息添加（Pre-fill 场景）
 		// 历史 assistant 消息不能添加没有 signature 的 dummy thinking block
 		if allowDummyThought && role == "model" && isThinkingEnabled && i == len(messages)-1 {
 			hasThoughtPart := false
-			firstPartIsThought := false
-			for idx, p := range parts {
+			for _, p := range parts {
 				if p.Thought {
 					hasThoughtPart = true
-					if idx == 0 {
-						firstPartIsThought = true
-					}
 					break
 				}
 			}
-			// 如果没有thinking part，或者有thinking part但不在第一个位置，都需要在开头添加dummy thinking block
-			if len(parts) > 0 && (!hasThoughtPart || !firstPartIsThought) {
+			if !hasThoughtPart && len(parts) > 0 {
 				// 在开头添加 dummy thinking block
 				parts = append([]GeminiPart{{
 					Text:             "Thinking...",
@@ -189,18 +173,8 @@ func buildContents(messages []ClaudeMessage, toolIDToName map[string]string, isT
 const dummyThoughtSignature = "skip_thought_signature_validator"
 
 // buildParts 构建消息的 parts
-type thoughtSignatureMode int
-
-const (
-	thoughtSignatureModePreserve thoughtSignatureMode = iota
-	thoughtSignatureModeDummy
-)
-
-// buildParts 构建消息的 parts
-// thoughtSignatureMode:
-// - dummy: 用 dummy signature 跳过 Gemini thoughtSignature 校验
-// - preserve: 透传输入中的 signature（主要用于 Claude via Vertex 的签名链路）
-func buildParts(content json.RawMessage, toolIDToName map[string]string, thoughtSignatureMode thoughtSignatureMode) ([]GeminiPart, error) {
+// allowDummyThought: 只有 Gemini 模型支持 dummy thought signature
+func buildParts(content json.RawMessage, toolIDToName map[string]string, allowDummyThought bool) ([]GeminiPart, error) {
 	var parts []GeminiPart
 
 	// 尝试解析为字符串
@@ -226,40 +200,22 @@ func buildParts(content json.RawMessage, toolIDToName map[string]string, thought
 			}
 
 		case "thinking":
-			signature := strings.TrimSpace(block.Signature)
-
-			if thoughtSignatureMode == thoughtSignatureModeDummy {
-				// Gemini 模型可以使用 dummy signature
-				parts = append(parts, GeminiPart{
-					Text:             block.Thinking,
-					Thought:          true,
-					ThoughtSignature: dummyThoughtSignature,
-				})
-				continue
+			part := GeminiPart{
+				Text:    block.Thinking,
+				Thought: true,
 			}
-
-			// Claude via Vertex：
-			// - signature 是上游返回的完整性令牌；本地不需要/无法验证，只能透传
-			// - 缺失/无效 signature（例如来自 Gemini 的 dummy signature）会导致上游 400
-			// - 为避免泄露 thinking 内容，缺失/无效 signature 的 thinking 直接丢弃
-			if signature == "" || signature == dummyThoughtSignature {
+			// 保留原有 signature（Claude 模型需要有效的 signature）
+			if block.Signature != "" {
+				part.ThoughtSignature = block.Signature
+			} else if !allowDummyThought {
+				// Claude 模型需要有效 signature，跳过无 signature 的 thinking block
+				log.Printf("Warning: skipping thinking block without signature for Claude model")
 				continue
-			}
-
-			// 兼容：用 Claude 的 "thinking" 块承载两类东西
-			// 1) 真正的 thought 文本（thinking != ""）-> Gemini thought part
-			// 2) 仅承载 signature 的空 thinking 块（thinking == ""）-> Gemini signature-only part
-			if strings.TrimSpace(block.Thinking) == "" {
-				parts = append(parts, GeminiPart{
-					ThoughtSignature: signature,
-				})
 			} else {
-				parts = append(parts, GeminiPart{
-					Text:             block.Thinking,
-					Thought:          true,
-					ThoughtSignature: signature,
-				})
+				// Gemini 模型使用 dummy signature
+				part.ThoughtSignature = dummyThoughtSignature
 			}
+			parts = append(parts, part)
 
 		case "image":
 			if block.Source != nil && block.Source.Type == "base64" {
@@ -284,15 +240,10 @@ func buildParts(content json.RawMessage, toolIDToName map[string]string, thought
 					ID:   block.ID,
 				},
 			}
-			switch thoughtSignatureMode {
-			case thoughtSignatureModeDummy:
+			// 只有 Gemini 模型使用 dummy signature
+			// Claude 模型不设置 signature（避免验证问题）
+			if allowDummyThought {
 				part.ThoughtSignature = dummyThoughtSignature
-			case thoughtSignatureModePreserve:
-				// Claude via Vertex：透传 tool_use 的 signature（如果有）
-				// 注意：跨模型混用时可能出现 dummy signature，这里直接丢弃以避免 400。
-				if sig := strings.TrimSpace(block.Signature); sig != "" && sig != dummyThoughtSignature {
-					part.ThoughtSignature = sig
-				}
 			}
 			parts = append(parts, part)
 
@@ -631,9 +582,11 @@ func cleanSchemaValue(value any) any {
 				continue
 			}
 
+			// 递归清理所有值
 			result[k] = cleanSchemaValue(val)
 		}
 		return result
+
 	case []any:
 		// 递归处理数组中的每个元素
 		cleaned := make([]any, 0, len(v))

backend/internal/pkg/antigravity/response_transformer.go

@@ -237,11 +237,7 @@ func (p *NonStreamingProcessor) buildResponse(geminiResp *GeminiResponse, respon
 	usage := ClaudeUsage{}
 	if geminiResp.UsageMetadata != nil {
 		cached := geminiResp.UsageMetadata.CachedContentTokenCount
-		prompt := geminiResp.UsageMetadata.PromptTokenCount
-		if cached > prompt {
-			cached = prompt
-		}
-		usage.InputTokens = prompt - cached
+		usage.InputTokens = geminiResp.UsageMetadata.PromptTokenCount - cached
 		usage.OutputTokens = geminiResp.UsageMetadata.CandidatesTokenCount
 		usage.CacheReadInputTokens = cached
 	}

backend/internal/pkg/antigravity/stream_transformer.go

@@ -81,11 +81,7 @@ func (p *StreamingProcessor) ProcessLine(line string) []byte {
 	// 但 Claude 的 input_tokens 不包含 cache_read_input_tokens，需要减去
 	if geminiResp.UsageMetadata != nil {
 		cached := geminiResp.UsageMetadata.CachedContentTokenCount
-		prompt := geminiResp.UsageMetadata.PromptTokenCount
-		if cached > prompt {
-			cached = prompt
-		}
-		p.inputTokens = prompt - cached
+		p.inputTokens = geminiResp.UsageMetadata.PromptTokenCount - cached
 		p.outputTokens = geminiResp.UsageMetadata.CandidatesTokenCount
 		p.cacheReadTokens = cached
 	}
@@ -134,11 +130,7 @@ func (p *StreamingProcessor) emitMessageStart(v1Resp *V1InternalResponse) []byte
 	usage := ClaudeUsage{}
 	if v1Resp.Response.UsageMetadata != nil {
 		cached := v1Resp.Response.UsageMetadata.CachedContentTokenCount
-		prompt := v1Resp.Response.UsageMetadata.PromptTokenCount
-		if cached > prompt {
-			cached = prompt
-		}
-		usage.InputTokens = prompt - cached
+		usage.InputTokens = v1Resp.Response.UsageMetadata.PromptTokenCount - cached
 		usage.OutputTokens = v1Resp.Response.UsageMetadata.CandidatesTokenCount
 		usage.CacheReadInputTokens = cached
 	}

backend/internal/service/account_usage_service.go

@@ -4,11 +4,9 @@ import (
 	"context"
 	"fmt"
 	"log"
-	"strings"
 	"sync"
 	"time"
 
-	"github.com/Wei-Shaw/sub2api/internal/pkg/antigravity"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/usagestats"
 )
@@ -84,18 +82,14 @@ const (
 
 // UsageCache 封装账户使用量相关的缓存
 type UsageCache struct {
-	apiCache         *sync.Map // accountID -> *apiUsageCache
-	windowStatsCache *sync.Map // accountID -> *windowStatsCache
-	antigravityCache *sync.Map // accountID -> *antigravityUsageCache
+	apiCache         sync.Map // accountID -> *apiUsageCache
+	windowStatsCache sync.Map // accountID -> *windowStatsCache
+	antigravityCache sync.Map // accountID -> *antigravityUsageCache
 }
 
 // NewUsageCache 创建 UsageCache 实例
 func NewUsageCache() *UsageCache {
-	return &UsageCache{
-		apiCache:         &sync.Map{},
-		antigravityCache: &sync.Map{},
-		windowStatsCache: &sync.Map{},
-	}
+	return &UsageCache{}
 }
 
 // WindowStats 窗口期统计
@@ -159,7 +153,7 @@ type AccountUsageService struct {
 	usageLogRepo            UsageLogRepository
 	usageFetcher            ClaudeUsageFetcher
 	geminiQuotaService      *GeminiQuotaService
-	antigravityQuotaFetcher QuotaFetcher
+	antigravityQuotaFetcher *AntigravityQuotaFetcher
 	cache                   *UsageCache
 }
 
@@ -172,33 +166,12 @@ func NewAccountUsageService(
 	antigravityQuotaFetcher *AntigravityQuotaFetcher,
 	cache *UsageCache,
 ) *AccountUsageService {
-	if cache == nil {
-		cache = &UsageCache{
-			apiCache:         &sync.Map{},
-			antigravityCache: &sync.Map{},
-			windowStatsCache: &sync.Map{},
-		}
-	}
-	if cache.apiCache == nil {
-		cache.apiCache = &sync.Map{}
-	}
-	if cache.antigravityCache == nil {
-		cache.antigravityCache = &sync.Map{}
-	}
-	if cache.windowStatsCache == nil {
-		cache.windowStatsCache = &sync.Map{}
-	}
-
-	var quotaFetcher QuotaFetcher
-	if antigravityQuotaFetcher != nil {
-		quotaFetcher = antigravityQuotaFetcher
-	}
 	return &AccountUsageService{
 		accountRepo:             accountRepo,
 		usageLogRepo:            usageLogRepo,
 		usageFetcher:            usageFetcher,
 		geminiQuotaService:      geminiQuotaService,
-		antigravityQuotaFetcher: quotaFetcher,
+		antigravityQuotaFetcher: antigravityQuotaFetcher,
 		cache:                   cache,
 	}
 }
@@ -292,8 +265,8 @@ func (s *AccountUsageService) getGeminiUsage(ctx context.Context, account *Accou
 	totals := geminiAggregateUsage(stats)
 	resetAt := geminiDailyResetTime(now)
 
-	usage.GeminiProDaily = buildGeminiUsageProgress(totals.ProRequests, quota.ProRPD, resetAt, totals.ProTokens, totals.ProCost)
-	usage.GeminiFlashDaily = buildGeminiUsageProgress(totals.FlashRequests, quota.FlashRPD, resetAt, totals.FlashTokens, totals.FlashCost)
+	usage.GeminiProDaily = buildGeminiUsageProgress(totals.ProRequests, quota.ProRPD, resetAt, totals.ProTokens, totals.ProCost, now)
+	usage.GeminiFlashDaily = buildGeminiUsageProgress(totals.FlashRequests, quota.FlashRPD, resetAt, totals.FlashTokens, totals.FlashCost, now)
 
 	return usage, nil
 }
@@ -305,41 +278,20 @@ func (s *AccountUsageService) getAntigravityUsage(ctx context.Context, account *
 		return &UsageInfo{UpdatedAt: &now}, nil
 	}
 
-	// Ensure project_id is stable for quota queries.
-	if strings.TrimSpace(account.GetCredential("project_id")) == "" {
-		projectID := antigravity.GenerateMockProjectID()
-		if account.Credentials == nil {
-			account.Credentials = map[string]any{}
-		}
-		account.Credentials["project_id"] = projectID
-		if s.accountRepo != nil {
-			_, err := s.accountRepo.BulkUpdate(ctx, []int64{account.ID}, AccountBulkUpdate{
-				Credentials: map[string]any{"project_id": projectID},
-			})
-			if err != nil {
-				log.Printf("Failed to persist antigravity project_id for account %d: %v", account.ID, err)
-			}
-		}
-	}
-
 	// 1. 检查缓存（10 分钟）
 	if cached, ok := s.cache.antigravityCache.Load(account.ID); ok {
 		if cache, ok := cached.(*antigravityUsageCache); ok && time.Since(cache.timestamp) < apiCacheTTL {
 			// 重新计算 RemainingSeconds
-			usage := cloneUsageInfo(cache.usageInfo)
+			usage := cache.usageInfo
 			if usage.FiveHour != nil && usage.FiveHour.ResetsAt != nil {
-				usage.FiveHour.RemainingSeconds = remainingSecondsUntil(*usage.FiveHour.ResetsAt)
+				usage.FiveHour.RemainingSeconds = int(time.Until(*usage.FiveHour.ResetsAt).Seconds())
 			}
 			return usage, nil
 		}
 	}
 
 	// 2. 获取代理 URL
-	proxyURL, err := s.antigravityQuotaFetcher.GetProxyURL(ctx, account)
-	if err != nil {
-		log.Printf("Failed to get proxy URL for account %d: %v", account.ID, err)
-		proxyURL = ""
-	}
+	proxyURL := s.antigravityQuotaFetcher.GetProxyURL(ctx, account)
 
 	// 3. 调用 API 获取额度
 	result, err := s.antigravityQuotaFetcher.FetchQuota(ctx, account, proxyURL)
@@ -468,12 +420,12 @@ func (s *AccountUsageService) buildUsageInfo(resp *ClaudeUsageResponse, updatedA
 
 	// 5小时窗口 - 始终创建对象（即使 ResetsAt 为空）
 	info.FiveHour = &UsageProgress{
-		Utilization: clampFloat64(resp.FiveHour.Utilization, 0, 100),
+		Utilization: resp.FiveHour.Utilization,
 	}
 	if resp.FiveHour.ResetsAt != "" {
 		if fiveHourReset, err := parseTime(resp.FiveHour.ResetsAt); err == nil {
 			info.FiveHour.ResetsAt = &fiveHourReset
-			info.FiveHour.RemainingSeconds = remainingSecondsUntil(fiveHourReset)
+			info.FiveHour.RemainingSeconds = int(time.Until(fiveHourReset).Seconds())
 		} else {
 			log.Printf("Failed to parse FiveHour.ResetsAt: %s, error: %v", resp.FiveHour.ResetsAt, err)
 		}
@@ -483,14 +435,14 @@ func (s *AccountUsageService) buildUsageInfo(resp *ClaudeUsageResponse, updatedA
 	if resp.SevenDay.ResetsAt != "" {
 		if sevenDayReset, err := parseTime(resp.SevenDay.ResetsAt); err == nil {
 			info.SevenDay = &UsageProgress{
-				Utilization:      clampFloat64(resp.SevenDay.Utilization, 0, 100),
+				Utilization:      resp.SevenDay.Utilization,
 				ResetsAt:         &sevenDayReset,
-				RemainingSeconds: remainingSecondsUntil(sevenDayReset),
+				RemainingSeconds: int(time.Until(sevenDayReset).Seconds()),
 			}
 		} else {
 			log.Printf("Failed to parse SevenDay.ResetsAt: %s, error: %v", resp.SevenDay.ResetsAt, err)
 			info.SevenDay = &UsageProgress{
-				Utilization: clampFloat64(resp.SevenDay.Utilization, 0, 100),
+				Utilization: resp.SevenDay.Utilization,
 			}
 		}
 	}
@@ -499,14 +451,14 @@ func (s *AccountUsageService) buildUsageInfo(resp *ClaudeUsageResponse, updatedA
 	if resp.SevenDaySonnet.ResetsAt != "" {
 		if sonnetReset, err := parseTime(resp.SevenDaySonnet.ResetsAt); err == nil {
 			info.SevenDaySonnet = &UsageProgress{
-				Utilization:      clampFloat64(resp.SevenDaySonnet.Utilization, 0, 100),
+				Utilization:      resp.SevenDaySonnet.Utilization,
 				ResetsAt:         &sonnetReset,
-				RemainingSeconds: remainingSecondsUntil(sonnetReset),
+				RemainingSeconds: int(time.Until(sonnetReset).Seconds()),
 			}
 		} else {
 			log.Printf("Failed to parse SevenDaySonnet.ResetsAt: %s, error: %v", resp.SevenDaySonnet.ResetsAt, err)
 			info.SevenDaySonnet = &UsageProgress{
-				Utilization: clampFloat64(resp.SevenDaySonnet.Utilization, 0, 100),
+				Utilization: resp.SevenDaySonnet.Utilization,
 			}
 		}
 	}
@@ -520,7 +472,10 @@ func (s *AccountUsageService) estimateSetupTokenUsage(account *Account) *UsageIn
 
 	// 如果有session_window信息
 	if account.SessionWindowEnd != nil {
-		remaining := remainingSecondsUntil(*account.SessionWindowEnd)
+		remaining := int(time.Until(*account.SessionWindowEnd).Seconds())
+		if remaining < 0 {
+			remaining = 0
+		}
 
 		// 根据状态估算使用率 (百分比形式，100 = 100%)
 		var utilization float64
@@ -532,7 +487,6 @@ func (s *AccountUsageService) estimateSetupTokenUsage(account *Account) *UsageIn
 		default:
 			utilization = 0.0
 		}
-		utilization = clampFloat64(utilization, 0, 100)
 
 		info.FiveHour = &UsageProgress{
 			Utilization:      utilization,
@@ -551,12 +505,15 @@ func (s *AccountUsageService) estimateSetupTokenUsage(account *Account) *UsageIn
 	return info
 }
 
-func buildGeminiUsageProgress(used, limit int64, resetAt time.Time, tokens int64, cost float64) *UsageProgress {
+func buildGeminiUsageProgress(used, limit int64, resetAt time.Time, tokens int64, cost float64, now time.Time) *UsageProgress {
 	if limit <= 0 {
 		return nil
 	}
-	utilization := clampFloat64((float64(used)/float64(limit))*100, 0, 100)
-	remainingSeconds := remainingSecondsUntil(resetAt)
+	utilization := (float64(used) / float64(limit)) * 100
+	remainingSeconds := int(resetAt.Sub(now).Seconds())
+	if remainingSeconds < 0 {
+		remainingSeconds = 0
+	}
 	resetCopy := resetAt
 	return &UsageProgress{
 		Utilization:      utilization,
@@ -569,47 +526,3 @@ func buildGeminiUsageProgress(used, limit int64, resetAt time.Time, tokens int64
 		},
 	}
 }
-
-func cloneUsageInfo(src *UsageInfo) *UsageInfo {
-	if src == nil {
-		return nil
-	}
-	dst := *src
-	if src.UpdatedAt != nil {
-		t := *src.UpdatedAt
-		dst.UpdatedAt = &t
-	}
-	dst.FiveHour = cloneUsageProgress(src.FiveHour)
-	dst.SevenDay = cloneUsageProgress(src.SevenDay)
-	dst.SevenDaySonnet = cloneUsageProgress(src.SevenDaySonnet)
-	dst.GeminiProDaily = cloneUsageProgress(src.GeminiProDaily)
-	dst.GeminiFlashDaily = cloneUsageProgress(src.GeminiFlashDaily)
-	if src.AntigravityQuota != nil {
-		dst.AntigravityQuota = make(map[string]*AntigravityModelQuota, len(src.AntigravityQuota))
-		for k, v := range src.AntigravityQuota {
-			if v == nil {
-				dst.AntigravityQuota[k] = nil
-				continue
-			}
-			copyVal := *v
-			dst.AntigravityQuota[k] = &copyVal
-		}
-	}
-	return &dst
-}
-
-func cloneUsageProgress(src *UsageProgress) *UsageProgress {
-	if src == nil {
-		return nil
-	}
-	dst := *src
-	if src.ResetsAt != nil {
-		t := *src.ResetsAt
-		dst.ResetsAt = &t
-	}
-	if src.WindowStats != nil {
-		statsCopy := *src.WindowStats
-		dst.WindowStats = &statsCopy
-	}
-	return &dst
-}

backend/internal/service/antigravity_gateway_service.go

@@ -64,7 +64,6 @@ type AntigravityGatewayService struct {
 	tokenProvider    *AntigravityTokenProvider
 	rateLimitService *RateLimitService
 	httpUpstream     HTTPUpstream
-	settingService   *SettingService
 }
 
 func NewAntigravityGatewayService(
@@ -73,14 +72,12 @@ func NewAntigravityGatewayService(
 	tokenProvider *AntigravityTokenProvider,
 	rateLimitService *RateLimitService,
 	httpUpstream HTTPUpstream,
-	settingService *SettingService,
 ) *AntigravityGatewayService {
 	return &AntigravityGatewayService{
 		accountRepo:      accountRepo,
 		tokenProvider:    tokenProvider,
 		rateLimitService: rateLimitService,
 		httpUpstream:     httpUpstream,
-		settingService:   settingService,
 	}
 }
 
@@ -310,106 +307,6 @@ func (s *AntigravityGatewayService) unwrapV1InternalResponse(body []byte) ([]byt
 	return body, nil
 }
 
-// isSignatureRelatedError 检测是否为 signature 相关的 400 错误
-// 注意：不包含 "thinking" 关键词，避免误判消息格式错误为 signature 错误
-func isSignatureRelatedError(statusCode int, body []byte) bool {
-	if statusCode != 400 {
-		return false
-	}
-
-	bodyStr := strings.ToLower(string(body))
-	keywords := []string{
-		"signature",
-		"thought_signature",
-		"thoughtsignature",
-		"invalid signature",
-		"signature validation",
-	}
-
-	for _, keyword := range keywords {
-		if strings.Contains(bodyStr, keyword) {
-			return true
-		}
-	}
-	return false
-}
-
-// isModelNotFoundError 检测是否为模型不存在的 404 错误
-func isModelNotFoundError(statusCode int, body []byte) bool {
-	if statusCode != 404 {
-		return false
-	}
-
-	bodyStr := strings.ToLower(string(body))
-	keywords := []string{
-		"model not found",
-		"model does not exist",
-		"unknown model",
-		"invalid model",
-	}
-
-	for _, keyword := range keywords {
-		if strings.Contains(bodyStr, keyword) {
-			return true
-		}
-	}
-	return false
-}
-
-// stripThinkingFromClaudeRequest 从 Claude 请求中移除有问题的 thinking 块
-// 策略：只移除历史消息中带 dummy signature 的 thinking 块，保留本次 thinking 配置
-// 这样可以让本次对话仍然使用 thinking 功能，只是清理历史中可能导致问题的内容
-func stripThinkingFromClaudeRequest(req *antigravity.ClaudeRequest) *antigravity.ClaudeRequest {
-	// 创建副本
-	stripped := *req
-
-	// 保留 thinking 配置，让本次对话仍然可以使用 thinking
-	// stripped.Thinking = nil  // 不再移除
-
-	// 只移除消息中带 dummy signature 的 thinking 块
-	if len(stripped.Messages) > 0 {
-		newMessages := make([]antigravity.ClaudeMessage, 0, len(stripped.Messages))
-		for _, msg := range stripped.Messages {
-			newMsg := msg
-
-			// 如果 content 是数组，过滤有问题的 thinking 块
-			var blocks []map[string]any
-			if err := json.Unmarshal(msg.Content, &blocks); err == nil {
-				filtered := make([]map[string]any, 0, len(blocks))
-				for _, block := range blocks {
-					// 跳过带 dummy signature 的 thinking 块
-					if blockType, ok := block["type"].(string); ok && blockType == "thinking" {
-						if sig, ok := block["signature"].(string); ok {
-							// 移除 dummy signature 的 thinking 块
-							if sig == "skip_thought_signature_validator" || sig == "" {
-								continue
-							}
-						} else {
-							// 没有 signature 字段的 thinking 块也移除
-							continue
-						}
-					}
-					// 跳过没有 type 但有 thinking 字段的块（untyped thinking blocks）
-					if _, hasType := block["type"]; !hasType {
-						if _, hasThinking := block["thinking"]; hasThinking {
-							continue
-						}
-					}
-					filtered = append(filtered, block)
-				}
-				if newContent, err := json.Marshal(filtered); err == nil {
-					newMsg.Content = newContent
-				}
-			}
-
-			newMessages = append(newMessages, newMsg)
-		}
-		stripped.Messages = newMessages
-	}
-
-	return &stripped
-}
-
 // Forward 转发 Claude 协议请求（Claude → Gemini 转换）
 func (s *AntigravityGatewayService) Forward(ctx context.Context, c *gin.Context, account *Account, body []byte) (*ForwardResult, error) {
 	startTime := time.Now()
@@ -505,70 +402,11 @@ func (s *AntigravityGatewayService) Forward(ctx context.Context, c *gin.Context,
 		respBody, _ := io.ReadAll(io.LimitReader(resp.Body, 2<<20))
 		s.handleUpstreamError(ctx, account, resp.StatusCode, resp.Header, respBody)
 
-		// Auto 模式：检测 signature 错误并自动降级重试
-		if isSignatureRelatedError(resp.StatusCode, respBody) && claudeReq.Thinking != nil {
-			log.Printf("[Antigravity] Detected signature-related error, retrying without thinking blocks (account: %s, model: %s)", account.Name, mappedModel)
-
-			// 关闭原始响应，释放连接（respBody 已读取到内存）
-			_ = resp.Body.Close()
-
-			// 移除 thinking 块并重试一次
-			strippedReq := stripThinkingFromClaudeRequest(&claudeReq)
-			strippedBody, err := antigravity.TransformClaudeToGemini(strippedReq, projectID, mappedModel)
-			if err != nil {
-				log.Printf("[Antigravity] Failed to transform stripped request: %v", err)
-				// 降级失败，返回原始错误
-				if s.shouldFailoverWithTempUnsched(ctx, account, resp.StatusCode, respBody) {
-					return nil, &UpstreamFailoverError{StatusCode: resp.StatusCode}
-				}
-				return nil, s.writeMappedClaudeError(c, resp.StatusCode, respBody)
-			}
-
-			// 发送降级请求
-			retryReq, err := antigravity.NewAPIRequest(ctx, action, accessToken, strippedBody)
-			if err != nil {
-				log.Printf("[Antigravity] Failed to create retry request: %v", err)
-				if s.shouldFailoverWithTempUnsched(ctx, account, resp.StatusCode, respBody) {
-					return nil, &UpstreamFailoverError{StatusCode: resp.StatusCode}
-				}
-				return nil, s.writeMappedClaudeError(c, resp.StatusCode, respBody)
-			}
-
-			retryResp, err := s.httpUpstream.Do(retryReq, proxyURL, account.ID, account.Concurrency)
-			if err != nil {
-				log.Printf("[Antigravity] Retry request failed: %v", err)
-				if s.shouldFailoverWithTempUnsched(ctx, account, resp.StatusCode, respBody) {
-					return nil, &UpstreamFailoverError{StatusCode: resp.StatusCode}
-				}
-				return nil, s.writeMappedClaudeError(c, resp.StatusCode, respBody)
-			}
-
-			// 如果重试成功，使用重试的响应（不要 return，让后面的代码处理响应）
-			if retryResp.StatusCode < 400 {
-				log.Printf("[Antigravity] Retry succeeded after stripping thinking blocks (account: %s, model: %s)", account.Name, mappedModel)
-				resp = retryResp
-			} else {
-				// 重试也失败，返回重试的错误
-				retryRespBody, _ := io.ReadAll(io.LimitReader(retryResp.Body, 2<<20))
-				_ = retryResp.Body.Close()
-				log.Printf("[Antigravity] Retry also failed with status %d: %s", retryResp.StatusCode, string(retryRespBody))
-				s.handleUpstreamError(ctx, account, retryResp.StatusCode, retryResp.Header, retryRespBody)
-
-				if s.shouldFailoverWithTempUnsched(ctx, account, retryResp.StatusCode, retryRespBody) {
-					return nil, &UpstreamFailoverError{StatusCode: retryResp.StatusCode}
-				}
-				return nil, s.writeMappedClaudeError(c, retryResp.StatusCode, retryRespBody)
-			}
+		if s.shouldFailoverUpstreamError(resp.StatusCode) {
+			return nil, &UpstreamFailoverError{StatusCode: resp.StatusCode}
 		}
 
-		// 不是 signature 错误，或者已经没有 thinking 块，直接返回错误
-		if resp.StatusCode >= 400 {
-			if s.shouldFailoverWithTempUnsched(ctx, account, resp.StatusCode, respBody) {
-				return nil, &UpstreamFailoverError{StatusCode: resp.StatusCode}
-			}
-
-			return nil, s.writeMappedClaudeError(c, resp.StatusCode, respBody)
-		}
+		return nil, s.writeMappedClaudeError(c, resp.StatusCode, respBody)
 	}
 
 	requestID := resp.Header.Get("x-request-id")
@@ -620,7 +458,16 @@ func (s *AntigravityGatewayService) ForwardGemini(ctx context.Context, c *gin.Co
 	case "generateContent", "streamGenerateContent":
 		// ok
 	case "countTokens":
-		return nil, s.writeGoogleError(c, http.StatusNotImplemented, "countTokens is not supported")
+		// 直接返回空值，不透传上游
+		c.JSON(http.StatusOK, map[string]any{"totalTokens": 0})
+		return &ForwardResult{
+			RequestID:    "",
+			Usage:        ClaudeUsage{},
+			Model:        originalModel,
+			Stream:       false,
+			Duration:     time.Since(time.Now()),
+			FirstTokenMs: nil,
+		}, nil
 	default:
 		return nil, s.writeGoogleError(c, http.StatusNotFound, "Unsupported action: "+action)
 	}
@@ -713,42 +560,7 @@ func (s *AntigravityGatewayService) ForwardGemini(ctx context.Context, c *gin.Co
 		respBody, _ := io.ReadAll(io.LimitReader(resp.Body, 2<<20))
 		s.handleUpstreamError(ctx, account, resp.StatusCode, resp.Header, respBody)
 
-		// Check if model fallback is enabled and this is a model not found error
-		if s.settingService != nil && s.settingService.IsModelFallbackEnabled(ctx) &&
-			isModelNotFoundError(resp.StatusCode, respBody) {
-
-			fallbackModel := s.settingService.GetFallbackModel(ctx, PlatformAntigravity)
-
-			// Only retry if fallback model is different from current model
-			if fallbackModel != "" && fallbackModel != mappedModel {
-				log.Printf("[Antigravity] Model not found (%s), retrying with fallback model %s (account: %s)",
-					mappedModel, fallbackModel, account.Name)
-
-				// Close original response
-				_ = resp.Body.Close()
-
-				// Rebuild request with fallback model
-				fallbackBody, err := s.wrapV1InternalRequest(projectID, fallbackModel, body)
-				if err == nil {
-					fallbackReq, err := antigravity.NewAPIRequest(ctx, upstreamAction, accessToken, fallbackBody)
-					if err == nil {
-						fallbackResp, err := s.httpUpstream.Do(fallbackReq, proxyURL, account.ID, account.Concurrency)
-						if err == nil && fallbackResp.StatusCode < 400 {
-							log.Printf("[Antigravity] Fallback succeeded with %s (account: %s)", fallbackModel, account.Name)
-							resp = fallbackResp
-							originalModel = fallbackModel // Update for billing
-							// Continue to normal response handling
-							goto handleSuccess
-						} else if fallbackResp != nil {
-							_ = fallbackResp.Body.Close()
-						}
-					}
-				}
-				log.Printf("[Antigravity] Fallback failed, returning original error")
-			}
-		}
-
-		if s.shouldFailoverWithTempUnsched(ctx, account, resp.StatusCode, respBody) {
+		if s.shouldFailoverUpstreamError(resp.StatusCode) {
 			return nil, &UpstreamFailoverError{StatusCode: resp.StatusCode}
 		}
 
@@ -762,7 +574,6 @@ func (s *AntigravityGatewayService) ForwardGemini(ctx context.Context, c *gin.Co
 		return nil, fmt.Errorf("antigravity upstream error: %d", resp.StatusCode)
 	}
 
-handleSuccess:
 	var usage *ClaudeUsage
 	var firstTokenMs *int
 
@@ -813,15 +624,6 @@ func (s *AntigravityGatewayService) shouldFailoverUpstreamError(statusCode int)
 	}
 }
 
-func (s *AntigravityGatewayService) shouldFailoverWithTempUnsched(ctx context.Context, account *Account, statusCode int, body []byte) bool {
-	if s.rateLimitService != nil {
-		if s.rateLimitService.HandleTempUnschedulable(ctx, account, statusCode, body) {
-			return true
-		}
-	}
-	return s.shouldFailoverUpstreamError(statusCode)
-}
-
 func sleepAntigravityBackoff(attempt int) {
 	sleepGeminiBackoff(attempt) // 复用 Gemini 的退避逻辑
 }
@@ -932,10 +734,7 @@ func (s *AntigravityGatewayService) handleGeminiNonStreamingResponse(c *gin.Cont
 	}
 
 	// 解包 v1internal 响应
-	unwrapped := respBody
-	if inner, unwrapErr := s.unwrapV1InternalResponse(respBody); unwrapErr == nil && inner != nil {
-		unwrapped = inner
-	}
+	unwrapped, _ := s.unwrapV1InternalResponse(respBody)
 
 	var parsed map[string]any
 	if json.Unmarshal(unwrapped, &parsed) == nil {
@@ -1009,8 +808,6 @@ func (s *AntigravityGatewayService) writeGoogleError(c *gin.Context, status int,
 		statusStr = "RESOURCE_EXHAUSTED"
 	case 500:
 		statusStr = "INTERNAL"
-	case 501:
-		statusStr = "UNIMPLEMENTED"
 	case 502, 503:
 		statusStr = "UNAVAILABLE"
 	}

backend/internal/service/antigravity_quota_fetcher.go

@@ -2,7 +2,6 @@ package service
 
 import (
 	"context"
-	"fmt"
 	"time"
 
 	"github.com/Wei-Shaw/sub2api/internal/pkg/antigravity"
@@ -20,9 +19,6 @@ func NewAntigravityQuotaFetcher(proxyRepo ProxyRepository) *AntigravityQuotaFetc
 
 // CanFetch 检查是否可以获取此账户的额度
 func (f *AntigravityQuotaFetcher) CanFetch(account *Account) bool {
-	if f == nil || account == nil {
-		return false
-	}
 	if account.Platform != PlatformAntigravity {
 		return false
 	}
@@ -32,12 +28,6 @@ func (f *AntigravityQuotaFetcher) CanFetch(account *Account) bool {
 
 // FetchQuota 获取 Antigravity 账户额度信息
 func (f *AntigravityQuotaFetcher) FetchQuota(ctx context.Context, account *Account, proxyURL string) (*QuotaResult, error) {
-	if f == nil {
-		return nil, fmt.Errorf("antigravity quota fetcher is nil")
-	}
-	if account == nil {
-		return nil, fmt.Errorf("account is nil")
-	}
 	accessToken := account.GetCredential("access_token")
 	projectID := account.GetCredential("project_id")
 
@@ -71,10 +61,6 @@ func (f *AntigravityQuotaFetcher) buildUsageInfo(modelsResp *antigravity.FetchAv
 		AntigravityQuota: make(map[string]*AntigravityModelQuota),
 	}
 
-	if modelsResp == nil {
-		return info
-	}
-
 	// 遍历所有模型，填充 AntigravityQuota
 	for modelName, modelInfo := range modelsResp.Models {
 		if modelInfo.QuotaInfo == nil {
@@ -82,7 +68,7 @@ func (f *AntigravityQuotaFetcher) buildUsageInfo(modelsResp *antigravity.FetchAv
 		}
 
 		// remainingFraction 是剩余比例 (0.0-1.0)，转换为使用率百分比
-		utilization := clampInt(int((1.0-modelInfo.QuotaInfo.RemainingFraction)*100), 0, 100)
+		utilization := int((1.0 - modelInfo.QuotaInfo.RemainingFraction) * 100)
 
 		info.AntigravityQuota[modelName] = &AntigravityModelQuota{
 			Utilization: utilization,
@@ -94,14 +80,14 @@ func (f *AntigravityQuotaFetcher) buildUsageInfo(modelsResp *antigravity.FetchAv
 	priorityModels := []string{"claude-sonnet-4-20250514", "claude-sonnet-4", "gemini-2.5-pro"}
 	for _, modelName := range priorityModels {
 		if modelInfo, ok := modelsResp.Models[modelName]; ok && modelInfo.QuotaInfo != nil {
-			utilization := clampFloat64((1.0-modelInfo.QuotaInfo.RemainingFraction)*100, 0, 100)
+			utilization := (1.0 - modelInfo.QuotaInfo.RemainingFraction) * 100
 			progress := &UsageProgress{
 				Utilization: utilization,
 			}
 			if modelInfo.QuotaInfo.ResetTime != "" {
 				if resetTime, err := time.Parse(time.RFC3339, modelInfo.QuotaInfo.ResetTime); err == nil {
 					progress.ResetsAt = &resetTime
-					progress.RemainingSeconds = remainingSecondsUntil(resetTime)
+					progress.RemainingSeconds = int(time.Until(resetTime).Seconds())
 				}
 			}
 			info.FiveHour = progress
@@ -113,22 +99,13 @@ func (f *AntigravityQuotaFetcher) buildUsageInfo(modelsResp *antigravity.FetchAv
 }
 
 // GetProxyURL 获取账户的代理 URL
-func (f *AntigravityQuotaFetcher) GetProxyURL(ctx context.Context, account *Account) (string, error) {
-	if f == nil {
-		return "", fmt.Errorf("antigravity quota fetcher is nil")
-	}
-	if account == nil {
-		return "", fmt.Errorf("account is nil")
-	}
+func (f *AntigravityQuotaFetcher) GetProxyURL(ctx context.Context, account *Account) string {
 	if account.ProxyID == nil || f.proxyRepo == nil {
-		return "", nil
+		return ""
 	}
 	proxy, err := f.proxyRepo.GetByID(ctx, *account.ProxyID)
-	if err != nil {
-		return "", err
-	}
-	if proxy == nil {
-		return "", nil
+	if err != nil || proxy == nil {
+		return ""
 	}
-	return proxy.URL(), nil
+	return proxy.URL()
 }

backend/internal/service/quota_fetcher.go

@@ -8,8 +8,6 @@ import (
 type QuotaFetcher interface {
 	// CanFetch 检查是否可以获取此账户的额度
 	CanFetch(account *Account) bool
-	// GetProxyURL 获取账户的代理 URL（如果没有代理则返回空字符串）
-	GetProxyURL(ctx context.Context, account *Account) (string, error)
 	// FetchQuota 获取账户额度信息
 	FetchQuota(ctx context.Context, account *Account, proxyURL string) (*QuotaResult, error)
 }