523 lines
18 KiB
Go
523 lines
18 KiB
Go
package handler
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import (
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"bytes"
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"context"
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"crypto/sha256"
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"encoding/hex"
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"errors"
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"io"
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"log"
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"net/http"
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"regexp"
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"strings"
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"time"
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"github.com/Wei-Shaw/sub2api/internal/pkg/antigravity"
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"github.com/Wei-Shaw/sub2api/internal/pkg/ctxkey"
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"github.com/Wei-Shaw/sub2api/internal/pkg/gemini"
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"github.com/Wei-Shaw/sub2api/internal/pkg/googleapi"
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"github.com/Wei-Shaw/sub2api/internal/pkg/ip"
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"github.com/Wei-Shaw/sub2api/internal/server/middleware"
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"github.com/Wei-Shaw/sub2api/internal/service"
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"github.com/gin-gonic/gin"
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)
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// geminiCLITmpDirRegex 用于从 Gemini CLI 请求体中提取 tmp 目录的哈希值
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// 匹配格式: /Users/xxx/.gemini/tmp/[64位十六进制哈希]
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var geminiCLITmpDirRegex = regexp.MustCompile(`/\.gemini/tmp/([A-Fa-f0-9]{64})`)
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func isGeminiCLIRequest(c *gin.Context, body []byte) bool {
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if strings.TrimSpace(c.GetHeader("x-gemini-api-privileged-user-id")) != "" {
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return true
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}
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return geminiCLITmpDirRegex.Match(body)
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}
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// GeminiV1BetaListModels proxies:
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// GET /v1beta/models
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func (h *GatewayHandler) GeminiV1BetaListModels(c *gin.Context) {
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apiKey, ok := middleware.GetAPIKeyFromContext(c)
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if !ok || apiKey == nil {
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googleError(c, http.StatusUnauthorized, "Invalid API key")
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return
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}
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// 检查平台：优先使用强制平台（/antigravity 路由），否则要求 gemini 分组
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forcePlatform, hasForcePlatform := middleware.GetForcePlatformFromContext(c)
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if !hasForcePlatform && (apiKey.Group == nil || apiKey.Group.Platform != service.PlatformGemini) {
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googleError(c, http.StatusBadRequest, "API key group platform is not gemini")
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return
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}
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// 强制 antigravity 模式：返回 antigravity 支持的模型列表
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if forcePlatform == service.PlatformAntigravity {
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c.JSON(http.StatusOK, antigravity.FallbackGeminiModelsList())
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return
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}
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account, err := h.geminiCompatService.SelectAccountForAIStudioEndpoints(c.Request.Context(), apiKey.GroupID)
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if err != nil {
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// 没有 gemini 账户，检查是否有 antigravity 账户可用
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hasAntigravity, _ := h.geminiCompatService.HasAntigravityAccounts(c.Request.Context(), apiKey.GroupID)
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if hasAntigravity {
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// antigravity 账户使用静态模型列表
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c.JSON(http.StatusOK, gemini.FallbackModelsList())
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return
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}
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googleError(c, http.StatusServiceUnavailable, "No available Gemini accounts: "+err.Error())
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return
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}
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res, err := h.geminiCompatService.ForwardAIStudioGET(c.Request.Context(), account, "/v1beta/models")
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if err != nil {
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googleError(c, http.StatusBadGateway, err.Error())
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return
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}
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if shouldFallbackGeminiModels(res) {
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c.JSON(http.StatusOK, gemini.FallbackModelsList())
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return
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}
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writeUpstreamResponse(c, res)
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}
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// GeminiV1BetaGetModel proxies:
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// GET /v1beta/models/{model}
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func (h *GatewayHandler) GeminiV1BetaGetModel(c *gin.Context) {
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apiKey, ok := middleware.GetAPIKeyFromContext(c)
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if !ok || apiKey == nil {
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googleError(c, http.StatusUnauthorized, "Invalid API key")
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return
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}
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// 检查平台：优先使用强制平台（/antigravity 路由），否则要求 gemini 分组
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forcePlatform, hasForcePlatform := middleware.GetForcePlatformFromContext(c)
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if !hasForcePlatform && (apiKey.Group == nil || apiKey.Group.Platform != service.PlatformGemini) {
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googleError(c, http.StatusBadRequest, "API key group platform is not gemini")
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return
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}
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modelName := strings.TrimSpace(c.Param("model"))
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if modelName == "" {
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googleError(c, http.StatusBadRequest, "Missing model in URL")
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return
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}
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// 强制 antigravity 模式：返回 antigravity 模型信息
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if forcePlatform == service.PlatformAntigravity {
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c.JSON(http.StatusOK, antigravity.FallbackGeminiModel(modelName))
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return
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}
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account, err := h.geminiCompatService.SelectAccountForAIStudioEndpoints(c.Request.Context(), apiKey.GroupID)
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if err != nil {
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// 没有 gemini 账户，检查是否有 antigravity 账户可用
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hasAntigravity, _ := h.geminiCompatService.HasAntigravityAccounts(c.Request.Context(), apiKey.GroupID)
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if hasAntigravity {
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// antigravity 账户使用静态模型信息
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c.JSON(http.StatusOK, gemini.FallbackModel(modelName))
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return
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}
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googleError(c, http.StatusServiceUnavailable, "No available Gemini accounts: "+err.Error())
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return
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}
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res, err := h.geminiCompatService.ForwardAIStudioGET(c.Request.Context(), account, "/v1beta/models/"+modelName)
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if err != nil {
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googleError(c, http.StatusBadGateway, err.Error())
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return
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}
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if shouldFallbackGeminiModels(res) {
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c.JSON(http.StatusOK, gemini.FallbackModel(modelName))
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return
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}
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writeUpstreamResponse(c, res)
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}
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// GeminiV1BetaModels proxies Gemini native REST endpoints like:
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// POST /v1beta/models/{model}:generateContent
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// POST /v1beta/models/{model}:streamGenerateContent?alt=sse
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func (h *GatewayHandler) GeminiV1BetaModels(c *gin.Context) {
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apiKey, ok := middleware.GetAPIKeyFromContext(c)
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if !ok || apiKey == nil {
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googleError(c, http.StatusUnauthorized, "Invalid API key")
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return
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}
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authSubject, ok := middleware.GetAuthSubjectFromContext(c)
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if !ok {
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googleError(c, http.StatusInternalServerError, "User context not found")
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return
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}
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// 检查平台：优先使用强制平台（/antigravity 路由，中间件已设置 request.Context），否则要求 gemini 分组
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if !middleware.HasForcePlatform(c) {
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if apiKey.Group == nil || apiKey.Group.Platform != service.PlatformGemini {
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googleError(c, http.StatusBadRequest, "API key group platform is not gemini")
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return
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}
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}
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modelName, action, err := parseGeminiModelAction(strings.TrimPrefix(c.Param("modelAction"), "/"))
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if err != nil {
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googleError(c, http.StatusNotFound, err.Error())
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return
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}
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stream := action == "streamGenerateContent"
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body, err := io.ReadAll(c.Request.Body)
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if err != nil {
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if maxErr, ok := extractMaxBytesError(err); ok {
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googleError(c, http.StatusRequestEntityTooLarge, buildBodyTooLargeMessage(maxErr.Limit))
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return
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}
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googleError(c, http.StatusBadRequest, "Failed to read request body")
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return
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}
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if len(body) == 0 {
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googleError(c, http.StatusBadRequest, "Request body is empty")
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return
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}
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setOpsRequestContext(c, modelName, stream, body)
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// Get subscription (may be nil)
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subscription, _ := middleware.GetSubscriptionFromContext(c)
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// For Gemini native API, do not send Claude-style ping frames.
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geminiConcurrency := NewConcurrencyHelper(h.concurrencyHelper.concurrencyService, SSEPingFormatNone, 0)
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// 0) wait queue check
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maxWait := service.CalculateMaxWait(authSubject.Concurrency)
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canWait, err := geminiConcurrency.IncrementWaitCount(c.Request.Context(), authSubject.UserID, maxWait)
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waitCounted := false
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if err != nil {
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log.Printf("Increment wait count failed: %v", err)
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} else if !canWait {
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googleError(c, http.StatusTooManyRequests, "Too many pending requests, please retry later")
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return
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}
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if err == nil && canWait {
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waitCounted = true
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}
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defer func() {
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if waitCounted {
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geminiConcurrency.DecrementWaitCount(c.Request.Context(), authSubject.UserID)
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}
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}()
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// 1) user concurrency slot
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streamStarted := false
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userReleaseFunc, err := geminiConcurrency.AcquireUserSlotWithWait(c, authSubject.UserID, authSubject.Concurrency, stream, &streamStarted)
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if err != nil {
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googleError(c, http.StatusTooManyRequests, err.Error())
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return
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}
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if waitCounted {
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geminiConcurrency.DecrementWaitCount(c.Request.Context(), authSubject.UserID)
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waitCounted = false
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}
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// 确保请求取消时也会释放槽位，避免长连接被动中断造成泄漏
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userReleaseFunc = wrapReleaseOnDone(c.Request.Context(), userReleaseFunc)
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if userReleaseFunc != nil {
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defer userReleaseFunc()
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}
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// 2) billing eligibility check (after wait)
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if err := h.billingCacheService.CheckBillingEligibility(c.Request.Context(), apiKey.User, apiKey, apiKey.Group, subscription); err != nil {
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status, _, message := billingErrorDetails(err)
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googleError(c, status, message)
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return
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}
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// 3) select account (sticky session based on request body)
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// 优先使用 Gemini CLI 的会话标识（privileged-user-id + tmp 目录哈希）
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sessionHash := extractGeminiCLISessionHash(c, body)
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if sessionHash == "" {
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// Fallback: 使用通用的会话哈希生成逻辑（适用于其他客户端）
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parsedReq, _ := service.ParseGatewayRequest(body)
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sessionHash = h.gatewayService.GenerateSessionHash(parsedReq)
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}
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sessionKey := sessionHash
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if sessionHash != "" {
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sessionKey = "gemini:" + sessionHash
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}
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// 查询粘性会话绑定的账号 ID（用于检测账号切换）
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var sessionBoundAccountID int64
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if sessionKey != "" {
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sessionBoundAccountID, _ = h.gatewayService.GetCachedSessionAccountID(c.Request.Context(), apiKey.GroupID, sessionKey)
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}
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isCLI := isGeminiCLIRequest(c, body)
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cleanedForUnknownBinding := false
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maxAccountSwitches := h.maxAccountSwitchesGemini
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switchCount := 0
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failedAccountIDs := make(map[int64]struct{})
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lastFailoverStatus := 0
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for {
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selection, err := h.gatewayService.SelectAccountWithLoadAwareness(c.Request.Context(), apiKey.GroupID, sessionKey, modelName, failedAccountIDs, "") // Gemini 不使用会话限制
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if err != nil {
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if len(failedAccountIDs) == 0 {
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googleError(c, http.StatusServiceUnavailable, "No available Gemini accounts: "+err.Error())
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return
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}
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handleGeminiFailoverExhausted(c, lastFailoverStatus)
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return
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}
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account := selection.Account
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setOpsSelectedAccount(c, account.ID)
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// 检测账号切换：如果粘性会话绑定的账号与当前选择的账号不同，清除 thoughtSignature
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// 注意：Gemini 原生 API 的 thoughtSignature 与具体上游账号强相关；跨账号透传会导致 400。
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if sessionBoundAccountID > 0 && sessionBoundAccountID != account.ID {
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log.Printf("[Gemini] Sticky session account switched: %d -> %d, cleaning thoughtSignature", sessionBoundAccountID, account.ID)
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body = service.CleanGeminiNativeThoughtSignatures(body)
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sessionBoundAccountID = account.ID
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} else if sessionKey != "" && sessionBoundAccountID == 0 && isCLI && !cleanedForUnknownBinding && bytes.Contains(body, []byte(`"thoughtSignature"`)) {
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// 无缓存绑定但请求里已有 thoughtSignature：常见于缓存丢失/TTL 过期后，CLI 继续携带旧签名。
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// 为避免第一次转发就 400，这里做一次确定性清理，让新账号重新生成签名链路。
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log.Printf("[Gemini] Sticky session binding missing for CLI request, cleaning thoughtSignature proactively")
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body = service.CleanGeminiNativeThoughtSignatures(body)
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cleanedForUnknownBinding = true
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sessionBoundAccountID = account.ID
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} else if sessionBoundAccountID == 0 {
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// 记录本次请求中首次选择到的账号，便于同一请求内 failover 时检测切换。
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sessionBoundAccountID = account.ID
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}
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// 4) account concurrency slot
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accountReleaseFunc := selection.ReleaseFunc
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if !selection.Acquired {
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if selection.WaitPlan == nil {
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googleError(c, http.StatusServiceUnavailable, "No available Gemini accounts")
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return
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}
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accountWaitCounted := false
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canWait, err := geminiConcurrency.IncrementAccountWaitCount(c.Request.Context(), account.ID, selection.WaitPlan.MaxWaiting)
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if err != nil {
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log.Printf("Increment account wait count failed: %v", err)
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} else if !canWait {
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log.Printf("Account wait queue full: account=%d", account.ID)
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googleError(c, http.StatusTooManyRequests, "Too many pending requests, please retry later")
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return
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}
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if err == nil && canWait {
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accountWaitCounted = true
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}
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defer func() {
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if accountWaitCounted {
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geminiConcurrency.DecrementAccountWaitCount(c.Request.Context(), account.ID)
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}
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}()
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accountReleaseFunc, err = geminiConcurrency.AcquireAccountSlotWithWaitTimeout(
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c,
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account.ID,
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selection.WaitPlan.MaxConcurrency,
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selection.WaitPlan.Timeout,
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stream,
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&streamStarted,
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)
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if err != nil {
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googleError(c, http.StatusTooManyRequests, err.Error())
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return
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}
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if accountWaitCounted {
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geminiConcurrency.DecrementAccountWaitCount(c.Request.Context(), account.ID)
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accountWaitCounted = false
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}
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if err := h.gatewayService.BindStickySession(c.Request.Context(), apiKey.GroupID, sessionKey, account.ID); err != nil {
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log.Printf("Bind sticky session failed: %v", err)
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}
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}
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// 账号槽位/等待计数需要在超时或断开时安全回收
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accountReleaseFunc = wrapReleaseOnDone(c.Request.Context(), accountReleaseFunc)
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// 5) forward (根据平台分流)
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var result *service.ForwardResult
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requestCtx := c.Request.Context()
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if switchCount > 0 {
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requestCtx = context.WithValue(requestCtx, ctxkey.AccountSwitchCount, switchCount)
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}
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if account.Platform == service.PlatformAntigravity {
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result, err = h.antigravityGatewayService.ForwardGemini(requestCtx, c, account, modelName, action, stream, body)
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} else {
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result, err = h.geminiCompatService.ForwardNative(requestCtx, c, account, modelName, action, stream, body)
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}
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if accountReleaseFunc != nil {
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accountReleaseFunc()
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}
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if err != nil {
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var failoverErr *service.UpstreamFailoverError
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if errors.As(err, &failoverErr) {
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failedAccountIDs[account.ID] = struct{}{}
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if switchCount >= maxAccountSwitches {
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lastFailoverStatus = failoverErr.StatusCode
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handleGeminiFailoverExhausted(c, lastFailoverStatus)
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return
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}
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lastFailoverStatus = failoverErr.StatusCode
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switchCount++
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log.Printf("Gemini account %d: upstream error %d, switching account %d/%d", account.ID, failoverErr.StatusCode, switchCount, maxAccountSwitches)
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continue
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}
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// ForwardNative already wrote the response
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log.Printf("Gemini native forward failed: %v", err)
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return
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}
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// 捕获请求信息（用于异步记录，避免在 goroutine 中访问 gin.Context）
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userAgent := c.GetHeader("User-Agent")
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clientIP := ip.GetClientIP(c)
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// 6) record usage async
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go func(result *service.ForwardResult, usedAccount *service.Account, ua, ip string) {
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ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
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defer cancel()
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if err := h.gatewayService.RecordUsage(ctx, &service.RecordUsageInput{
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Result: result,
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APIKey: apiKey,
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User: apiKey.User,
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Account: usedAccount,
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Subscription: subscription,
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UserAgent: ua,
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IPAddress: ip,
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}); err != nil {
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log.Printf("Record usage failed: %v", err)
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}
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}(result, account, userAgent, clientIP)
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return
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}
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}
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func parseGeminiModelAction(rest string) (model string, action string, err error) {
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rest = strings.TrimSpace(rest)
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if rest == "" {
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return "", "", &pathParseError{"missing path"}
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}
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// Standard: {model}:{action}
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if i := strings.Index(rest, ":"); i > 0 && i < len(rest)-1 {
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return rest[:i], rest[i+1:], nil
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}
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// Fallback: {model}/{action}
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if i := strings.Index(rest, "/"); i > 0 && i < len(rest)-1 {
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return rest[:i], rest[i+1:], nil
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}
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return "", "", &pathParseError{"invalid model action path"}
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}
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func handleGeminiFailoverExhausted(c *gin.Context, statusCode int) {
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status, message := mapGeminiUpstreamError(statusCode)
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googleError(c, status, message)
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}
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func mapGeminiUpstreamError(statusCode int) (int, string) {
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switch statusCode {
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case 401:
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return http.StatusBadGateway, "Upstream authentication failed, please contact administrator"
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case 403:
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return http.StatusBadGateway, "Upstream access forbidden, please contact administrator"
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case 429:
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return http.StatusTooManyRequests, "Upstream rate limit exceeded, please retry later"
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case 529:
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return http.StatusServiceUnavailable, "Upstream service overloaded, please retry later"
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case 500, 502, 503, 504:
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return http.StatusBadGateway, "Upstream service temporarily unavailable"
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default:
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return http.StatusBadGateway, "Upstream request failed"
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}
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}
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type pathParseError struct{ msg string }
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func (e *pathParseError) Error() string { return e.msg }
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func googleError(c *gin.Context, status int, message string) {
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c.JSON(status, gin.H{
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"error": gin.H{
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"code": status,
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"message": message,
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"status": googleapi.HTTPStatusToGoogleStatus(status),
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},
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})
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}
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|
||
func writeUpstreamResponse(c *gin.Context, res *service.UpstreamHTTPResult) {
|
||
if res == nil {
|
||
googleError(c, http.StatusBadGateway, "Empty upstream response")
|
||
return
|
||
}
|
||
for k, vv := range res.Headers {
|
||
// Avoid overriding content-length and hop-by-hop headers.
|
||
if strings.EqualFold(k, "Content-Length") || strings.EqualFold(k, "Transfer-Encoding") || strings.EqualFold(k, "Connection") {
|
||
continue
|
||
}
|
||
for _, v := range vv {
|
||
c.Writer.Header().Add(k, v)
|
||
}
|
||
}
|
||
contentType := res.Headers.Get("Content-Type")
|
||
if contentType == "" {
|
||
contentType = "application/json"
|
||
}
|
||
c.Data(res.StatusCode, contentType, res.Body)
|
||
}
|
||
|
||
func shouldFallbackGeminiModels(res *service.UpstreamHTTPResult) bool {
|
||
if res == nil {
|
||
return true
|
||
}
|
||
if res.StatusCode != http.StatusUnauthorized && res.StatusCode != http.StatusForbidden {
|
||
return false
|
||
}
|
||
if strings.Contains(strings.ToLower(res.Headers.Get("Www-Authenticate")), "insufficient_scope") {
|
||
return true
|
||
}
|
||
if strings.Contains(strings.ToLower(string(res.Body)), "insufficient authentication scopes") {
|
||
return true
|
||
}
|
||
if strings.Contains(strings.ToLower(string(res.Body)), "access_token_scope_insufficient") {
|
||
return true
|
||
}
|
||
return false
|
||
}
|
||
|
||
// extractGeminiCLISessionHash 从 Gemini CLI 请求中提取会话标识。
|
||
// 组合 x-gemini-api-privileged-user-id header 和请求体中的 tmp 目录哈希。
|
||
//
|
||
// 会话标识生成策略：
|
||
// 1. 从请求体中提取 tmp 目录哈希（64位十六进制）
|
||
// 2. 从 header 中提取 privileged-user-id（UUID）
|
||
// 3. 组合两者生成 SHA256 哈希作为最终的会话标识
|
||
//
|
||
// 如果找不到 tmp 目录哈希，返回空字符串（不使用粘性会话）。
|
||
//
|
||
// extractGeminiCLISessionHash extracts session identifier from Gemini CLI requests.
|
||
// Combines x-gemini-api-privileged-user-id header with tmp directory hash from request body.
|
||
func extractGeminiCLISessionHash(c *gin.Context, body []byte) string {
|
||
// 1. 从请求体中提取 tmp 目录哈希
|
||
match := geminiCLITmpDirRegex.FindSubmatch(body)
|
||
if len(match) < 2 {
|
||
return "" // 没有找到 tmp 目录，不使用粘性会话
|
||
}
|
||
tmpDirHash := string(match[1])
|
||
|
||
// 2. 提取 privileged-user-id
|
||
privilegedUserID := strings.TrimSpace(c.GetHeader("x-gemini-api-privileged-user-id"))
|
||
|
||
// 3. 组合生成最终的 session hash
|
||
if privilegedUserID != "" {
|
||
// 组合两个标识符：privileged-user-id + tmp 目录哈希
|
||
combined := privilegedUserID + ":" + tmpDirHash
|
||
hash := sha256.Sum256([]byte(combined))
|
||
return hex.EncodeToString(hash[:])
|
||
}
|
||
|
||
// 如果没有 privileged-user-id，直接使用 tmp 目录哈希
|
||
return tmpDirHash
|
||
}
|