499 lines
16 KiB
Go
499 lines
16 KiB
Go
package handler
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import (
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"context"
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"encoding/json"
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"fmt"
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"io"
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"log"
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"net/http"
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"strings"
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"time"
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"github.com/Wei-Shaw/sub2api/internal/pkg/claude"
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"github.com/Wei-Shaw/sub2api/internal/pkg/openai"
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middleware2 "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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// GatewayHandler handles API gateway requests
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type GatewayHandler struct {
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gatewayService *service.GatewayService
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geminiCompatService *service.GeminiMessagesCompatService
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userService *service.UserService
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billingCacheService *service.BillingCacheService
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concurrencyHelper *ConcurrencyHelper
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}
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// NewGatewayHandler creates a new GatewayHandler
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func NewGatewayHandler(
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gatewayService *service.GatewayService,
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geminiCompatService *service.GeminiMessagesCompatService,
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userService *service.UserService,
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concurrencyService *service.ConcurrencyService,
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billingCacheService *service.BillingCacheService,
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) *GatewayHandler {
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return &GatewayHandler{
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gatewayService: gatewayService,
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geminiCompatService: geminiCompatService,
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userService: userService,
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billingCacheService: billingCacheService,
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concurrencyHelper: NewConcurrencyHelper(concurrencyService, SSEPingFormatClaude),
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}
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}
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// Messages handles Claude API compatible messages endpoint
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// POST /v1/messages
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func (h *GatewayHandler) Messages(c *gin.Context) {
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// 从context获取apiKey和user（ApiKeyAuth中间件已设置）
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apiKey, ok := middleware2.GetApiKeyFromContext(c)
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if !ok {
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h.errorResponse(c, http.StatusUnauthorized, "authentication_error", "Invalid API key")
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return
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}
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subject, ok := middleware2.GetAuthSubjectFromContext(c)
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if !ok {
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h.errorResponse(c, http.StatusInternalServerError, "api_error", "User context not found")
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return
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}
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// 读取请求体
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body, err := io.ReadAll(c.Request.Body)
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if err != nil {
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h.errorResponse(c, http.StatusBadRequest, "invalid_request_error", "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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h.errorResponse(c, http.StatusBadRequest, "invalid_request_error", "Request body is empty")
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return
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}
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// 解析请求获取模型名和stream
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var req struct {
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Model string `json:"model"`
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Stream bool `json:"stream"`
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}
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if err := json.Unmarshal(body, &req); err != nil {
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h.errorResponse(c, http.StatusBadRequest, "invalid_request_error", "Failed to parse request body")
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return
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}
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// Track if we've started streaming (for error handling)
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streamStarted := false
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// 获取订阅信息（可能为nil）- 提前获取用于后续检查
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subscription, _ := middleware2.GetSubscriptionFromContext(c)
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// 0. 检查wait队列是否已满
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maxWait := service.CalculateMaxWait(subject.Concurrency)
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canWait, err := h.concurrencyHelper.IncrementWaitCount(c.Request.Context(), subject.UserID, maxWait)
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if err != nil {
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log.Printf("Increment wait count failed: %v", err)
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// On error, allow request to proceed
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} else if !canWait {
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h.errorResponse(c, http.StatusTooManyRequests, "rate_limit_error", "Too many pending requests, please retry later")
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return
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}
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// 确保在函数退出时减少wait计数
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defer h.concurrencyHelper.DecrementWaitCount(c.Request.Context(), subject.UserID)
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// 1. 首先获取用户并发槽位
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userReleaseFunc, err := h.concurrencyHelper.AcquireUserSlotWithWait(c, subject.UserID, subject.Concurrency, req.Stream, &streamStarted)
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if err != nil {
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log.Printf("User concurrency acquire failed: %v", err)
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h.handleConcurrencyError(c, err, "user", streamStarted)
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return
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}
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if userReleaseFunc != nil {
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defer userReleaseFunc()
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}
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// 2. 【新增】Wait后二次检查余额/订阅
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if err := h.billingCacheService.CheckBillingEligibility(c.Request.Context(), apiKey.User, apiKey, apiKey.Group, subscription); err != nil {
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log.Printf("Billing eligibility check failed after wait: %v", err)
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h.handleStreamingAwareError(c, http.StatusForbidden, "billing_error", err.Error(), streamStarted)
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return
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}
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// 计算粘性会话hash
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sessionHash := h.gatewayService.GenerateSessionHash(body)
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platform := ""
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if apiKey.Group != nil {
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platform = apiKey.Group.Platform
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}
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// 选择支持该模型的账号
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var account *model.Account
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if platform == model.PlatformGemini {
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account, err = h.geminiCompatService.SelectAccountForModel(c.Request.Context(), apiKey.GroupID, sessionHash, req.Model)
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} else {
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account, err = h.gatewayService.SelectAccountForModel(c.Request.Context(), apiKey.GroupID, sessionHash, req.Model)
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}
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if err != nil {
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h.handleStreamingAwareError(c, http.StatusServiceUnavailable, "api_error", "No available accounts: "+err.Error(), streamStarted)
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return
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}
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// 检查预热请求拦截（在账号选择后、转发前检查）
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if account.IsInterceptWarmupEnabled() && isWarmupRequest(body) {
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if req.Stream {
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sendMockWarmupStream(c, req.Model)
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} else {
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sendMockWarmupResponse(c, req.Model)
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}
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return
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}
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// 3. 获取账号并发槽位
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accountReleaseFunc, err := h.concurrencyHelper.AcquireAccountSlotWithWait(c, account.ID, account.Concurrency, req.Stream, &streamStarted)
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if err != nil {
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log.Printf("Account concurrency acquire failed: %v", err)
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h.handleConcurrencyError(c, err, "account", streamStarted)
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return
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}
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if accountReleaseFunc != nil {
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defer accountReleaseFunc()
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}
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// 转发请求
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var result *service.ForwardResult
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if platform == model.PlatformGemini {
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result, err = h.geminiCompatService.Forward(c.Request.Context(), c, account, body)
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} else {
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result, err = h.gatewayService.Forward(c.Request.Context(), c, account, body)
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}
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if err != nil {
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// 错误响应已在Forward中处理，这里只记录日志
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log.Printf("Forward request failed: %v", err)
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return
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}
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// 异步记录使用量（subscription已在函数开头获取）
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go func() {
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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: account,
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Subscription: subscription,
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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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}()
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}
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// Models handles listing available models
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// GET /v1/models
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// Returns different model lists based on the API key's group platform
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func (h *GatewayHandler) Models(c *gin.Context) {
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apiKey, _ := middleware2.GetApiKeyFromContext(c)
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// Return OpenAI models for OpenAI platform groups
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if apiKey != nil && apiKey.Group != nil && apiKey.Group.Platform == "openai" {
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c.JSON(http.StatusOK, gin.H{
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"object": "list",
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"data": openai.DefaultModels,
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})
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return
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}
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// Default: Claude models
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c.JSON(http.StatusOK, gin.H{
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"object": "list",
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"data": claude.DefaultModels,
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})
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}
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// Usage handles getting account balance for CC Switch integration
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// GET /v1/usage
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func (h *GatewayHandler) Usage(c *gin.Context) {
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apiKey, ok := middleware2.GetApiKeyFromContext(c)
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if !ok {
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h.errorResponse(c, http.StatusUnauthorized, "authentication_error", "Invalid API key")
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return
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}
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subject, ok := middleware2.GetAuthSubjectFromContext(c)
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if !ok {
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h.errorResponse(c, http.StatusUnauthorized, "authentication_error", "Invalid API key")
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return
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}
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// 订阅模式：返回订阅限额信息
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if apiKey.Group != nil && apiKey.Group.IsSubscriptionType() {
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subscription, ok := middleware2.GetSubscriptionFromContext(c)
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if !ok {
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h.errorResponse(c, http.StatusForbidden, "subscription_error", "No active subscription")
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return
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}
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remaining := h.calculateSubscriptionRemaining(apiKey.Group, subscription)
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c.JSON(http.StatusOK, gin.H{
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"isValid": true,
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"planName": apiKey.Group.Name,
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"remaining": remaining,
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"unit": "USD",
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})
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return
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}
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// 余额模式：返回钱包余额
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latestUser, err := h.userService.GetByID(c.Request.Context(), subject.UserID)
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if err != nil {
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h.errorResponse(c, http.StatusInternalServerError, "api_error", "Failed to get user info")
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return
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}
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c.JSON(http.StatusOK, gin.H{
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"isValid": true,
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"planName": "钱包余额",
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"remaining": latestUser.Balance,
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"unit": "USD",
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})
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}
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// calculateSubscriptionRemaining 计算订阅剩余可用额度
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// 逻辑：
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// 1. 如果日/周/月任一限额达到100%，返回0
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// 2. 否则返回所有已配置周期中剩余额度的最小值
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func (h *GatewayHandler) calculateSubscriptionRemaining(group *service.Group, sub *service.UserSubscription) float64 {
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var remainingValues []float64
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// 检查日限额
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if group.HasDailyLimit() {
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remaining := *group.DailyLimitUSD - sub.DailyUsageUSD
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if remaining <= 0 {
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return 0
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}
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remainingValues = append(remainingValues, remaining)
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}
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// 检查周限额
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if group.HasWeeklyLimit() {
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remaining := *group.WeeklyLimitUSD - sub.WeeklyUsageUSD
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if remaining <= 0 {
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return 0
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}
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remainingValues = append(remainingValues, remaining)
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}
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// 检查月限额
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if group.HasMonthlyLimit() {
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remaining := *group.MonthlyLimitUSD - sub.MonthlyUsageUSD
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if remaining <= 0 {
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return 0
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}
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remainingValues = append(remainingValues, remaining)
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}
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// 如果没有配置任何限额，返回-1表示无限制
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if len(remainingValues) == 0 {
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return -1
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}
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// 返回最小值
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min := remainingValues[0]
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for _, v := range remainingValues[1:] {
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if v < min {
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min = v
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}
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}
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return min
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}
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// handleConcurrencyError handles concurrency-related errors with proper 429 response
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func (h *GatewayHandler) handleConcurrencyError(c *gin.Context, err error, slotType string, streamStarted bool) {
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h.handleStreamingAwareError(c, http.StatusTooManyRequests, "rate_limit_error",
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fmt.Sprintf("Concurrency limit exceeded for %s, please retry later", slotType), streamStarted)
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}
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// handleStreamingAwareError handles errors that may occur after streaming has started
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func (h *GatewayHandler) handleStreamingAwareError(c *gin.Context, status int, errType, message string, streamStarted bool) {
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if streamStarted {
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// Stream already started, send error as SSE event then close
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flusher, ok := c.Writer.(http.Flusher)
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if ok {
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// Send error event in SSE format
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errorEvent := fmt.Sprintf(`data: {"type": "error", "error": {"type": "%s", "message": "%s"}}`+"\n\n", errType, message)
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if _, err := fmt.Fprint(c.Writer, errorEvent); err != nil {
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_ = c.Error(err)
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}
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flusher.Flush()
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}
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return
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}
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// Normal case: return JSON response with proper status code
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h.errorResponse(c, status, errType, message)
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}
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// errorResponse 返回Claude API格式的错误响应
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func (h *GatewayHandler) errorResponse(c *gin.Context, status int, errType, message string) {
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c.JSON(status, gin.H{
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"type": "error",
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"error": gin.H{
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"type": errType,
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"message": message,
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},
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})
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}
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// CountTokens handles token counting endpoint
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// POST /v1/messages/count_tokens
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// 特点：校验订阅/余额，但不计算并发、不记录使用量
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func (h *GatewayHandler) CountTokens(c *gin.Context) {
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// 从context获取apiKey和user（ApiKeyAuth中间件已设置）
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apiKey, ok := middleware2.GetApiKeyFromContext(c)
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if !ok {
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h.errorResponse(c, http.StatusUnauthorized, "authentication_error", "Invalid API key")
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return
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}
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_, ok = middleware2.GetAuthSubjectFromContext(c)
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if !ok {
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h.errorResponse(c, http.StatusInternalServerError, "api_error", "User context not found")
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return
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}
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// 读取请求体
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body, err := io.ReadAll(c.Request.Body)
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if err != nil {
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h.errorResponse(c, http.StatusBadRequest, "invalid_request_error", "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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h.errorResponse(c, http.StatusBadRequest, "invalid_request_error", "Request body is empty")
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return
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}
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// 解析请求获取模型名
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var req struct {
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Model string `json:"model"`
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}
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if err := json.Unmarshal(body, &req); err != nil {
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h.errorResponse(c, http.StatusBadRequest, "invalid_request_error", "Failed to parse request body")
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return
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}
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// 获取订阅信息（可能为nil）
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subscription, _ := middleware2.GetSubscriptionFromContext(c)
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// 校验 billing eligibility（订阅/余额）
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// 【注意】不计算并发，但需要校验订阅/余额
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if err := h.billingCacheService.CheckBillingEligibility(c.Request.Context(), apiKey.User, apiKey, apiKey.Group, subscription); err != nil {
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h.errorResponse(c, http.StatusForbidden, "billing_error", err.Error())
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return
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}
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// 计算粘性会话 hash
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sessionHash := h.gatewayService.GenerateSessionHash(body)
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// 选择支持该模型的账号
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account, err := h.gatewayService.SelectAccountForModel(c.Request.Context(), apiKey.GroupID, sessionHash, req.Model)
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if err != nil {
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h.errorResponse(c, http.StatusServiceUnavailable, "api_error", "No available accounts: "+err.Error())
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return
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}
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// 转发请求（不记录使用量）
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if err := h.gatewayService.ForwardCountTokens(c.Request.Context(), c, account, body); err != nil {
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log.Printf("Forward count_tokens request failed: %v", err)
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// 错误响应已在 ForwardCountTokens 中处理
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return
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}
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}
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// isWarmupRequest 检测是否为预热请求（标题生成、Warmup等）
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func isWarmupRequest(body []byte) bool {
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// 快速检查：如果body不包含关键字，直接返回false
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bodyStr := string(body)
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if !strings.Contains(bodyStr, "title") && !strings.Contains(bodyStr, "Warmup") {
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return false
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}
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// 解析完整请求
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var req struct {
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Messages []struct {
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Content []struct {
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Type string `json:"type"`
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Text string `json:"text"`
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} `json:"content"`
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} `json:"messages"`
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System []struct {
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Text string `json:"text"`
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} `json:"system"`
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}
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if err := json.Unmarshal(body, &req); err != nil {
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return false
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}
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// 检查 messages 中的标题提示模式
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for _, msg := range req.Messages {
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for _, content := range msg.Content {
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if content.Type == "text" {
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if strings.Contains(content.Text, "Please write a 5-10 word title for the following conversation:") ||
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content.Text == "Warmup" {
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return true
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}
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}
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}
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}
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// 检查 system 中的标题提取模式
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for _, system := range req.System {
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if strings.Contains(system.Text, "nalyze if this message indicates a new conversation topic. If it does, extract a 2-3 word title") {
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return true
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}
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}
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return false
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}
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// sendMockWarmupStream 发送流式 mock 响应（用于预热请求拦截）
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func sendMockWarmupStream(c *gin.Context, model string) {
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c.Header("Content-Type", "text/event-stream")
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c.Header("Cache-Control", "no-cache")
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c.Header("Connection", "keep-alive")
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c.Header("X-Accel-Buffering", "no")
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events := []string{
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`event: message_start` + "\n" + `data: {"message":{"content":[],"id":"msg_mock_warmup","model":"` + model + `","role":"assistant","stop_reason":null,"stop_sequence":null,"type":"message","usage":{"input_tokens":10,"output_tokens":0}},"type":"message_start"}`,
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`event: content_block_start` + "\n" + `data: {"content_block":{"text":"","type":"text"},"index":0,"type":"content_block_start"}`,
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`event: content_block_delta` + "\n" + `data: {"delta":{"text":"New","type":"text_delta"},"index":0,"type":"content_block_delta"}`,
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`event: content_block_delta` + "\n" + `data: {"delta":{"text":" Conversation","type":"text_delta"},"index":0,"type":"content_block_delta"}`,
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`event: content_block_stop` + "\n" + `data: {"index":0,"type":"content_block_stop"}`,
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`event: message_delta` + "\n" + `data: {"delta":{"stop_reason":"end_turn","stop_sequence":null},"type":"message_delta","usage":{"input_tokens":10,"output_tokens":2}}`,
|
||
`event: message_stop` + "\n" + `data: {"type":"message_stop"}`,
|
||
}
|
||
|
||
for _, event := range events {
|
||
_, _ = c.Writer.WriteString(event + "\n\n")
|
||
c.Writer.Flush()
|
||
time.Sleep(20 * time.Millisecond)
|
||
}
|
||
}
|
||
|
||
// sendMockWarmupResponse 发送非流式 mock 响应（用于预热请求拦截）
|
||
func sendMockWarmupResponse(c *gin.Context, model string) {
|
||
c.JSON(http.StatusOK, gin.H{
|
||
"id": "msg_mock_warmup",
|
||
"type": "message",
|
||
"role": "assistant",
|
||
"model": model,
|
||
"content": []gin.H{{"type": "text", "text": "New Conversation"}},
|
||
"stop_reason": "end_turn",
|
||
"usage": gin.H{
|
||
"input_tokens": 10,
|
||
"output_tokens": 2,
|
||
},
|
||
})
|
||
}
|