e78c864650
主要功能： - Gemini OAuth 配额系统优化：Google One tier 自动推断 - Antigravity 网关增强：Thinking Block 重试、Claude 模型 signature 透传 - 账号调度改进：临时不可调度功能、负载感知调度优化 - 前端用户体验：账号管理界面优化、使用教程改进 冲突解决：保留 handleUpstreamError 的 prefix 参数和日志记录能力， 同时合并 PR 的 thinking block 重试和 model fallback 功能。
803 lines
26 KiB
Go
803 lines
26 KiB
Go
package handler
|
||
|
||
import (
|
||
"context"
|
||
"encoding/json"
|
||
"errors"
|
||
"fmt"
|
||
"io"
|
||
"log"
|
||
"net/http"
|
||
"strings"
|
||
"time"
|
||
|
||
"github.com/Wei-Shaw/sub2api/internal/pkg/antigravity"
|
||
"github.com/Wei-Shaw/sub2api/internal/pkg/claude"
|
||
"github.com/Wei-Shaw/sub2api/internal/pkg/openai"
|
||
middleware2 "github.com/Wei-Shaw/sub2api/internal/server/middleware"
|
||
"github.com/Wei-Shaw/sub2api/internal/service"
|
||
|
||
"github.com/gin-gonic/gin"
|
||
)
|
||
|
||
// GatewayHandler handles API gateway requests
|
||
type GatewayHandler struct {
|
||
gatewayService *service.GatewayService
|
||
geminiCompatService *service.GeminiMessagesCompatService
|
||
antigravityGatewayService *service.AntigravityGatewayService
|
||
userService *service.UserService
|
||
billingCacheService *service.BillingCacheService
|
||
concurrencyHelper *ConcurrencyHelper
|
||
}
|
||
|
||
// NewGatewayHandler creates a new GatewayHandler
|
||
func NewGatewayHandler(
|
||
gatewayService *service.GatewayService,
|
||
geminiCompatService *service.GeminiMessagesCompatService,
|
||
antigravityGatewayService *service.AntigravityGatewayService,
|
||
userService *service.UserService,
|
||
concurrencyService *service.ConcurrencyService,
|
||
billingCacheService *service.BillingCacheService,
|
||
) *GatewayHandler {
|
||
return &GatewayHandler{
|
||
gatewayService: gatewayService,
|
||
geminiCompatService: geminiCompatService,
|
||
antigravityGatewayService: antigravityGatewayService,
|
||
userService: userService,
|
||
billingCacheService: billingCacheService,
|
||
concurrencyHelper: NewConcurrencyHelper(concurrencyService, SSEPingFormatClaude),
|
||
}
|
||
}
|
||
|
||
// Messages handles Claude API compatible messages endpoint
|
||
// POST /v1/messages
|
||
func (h *GatewayHandler) Messages(c *gin.Context) {
|
||
// 从context获取apiKey和user（ApiKeyAuth中间件已设置）
|
||
apiKey, ok := middleware2.GetAPIKeyFromContext(c)
|
||
if !ok {
|
||
h.errorResponse(c, http.StatusUnauthorized, "authentication_error", "Invalid API key")
|
||
return
|
||
}
|
||
|
||
subject, ok := middleware2.GetAuthSubjectFromContext(c)
|
||
if !ok {
|
||
h.errorResponse(c, http.StatusInternalServerError, "api_error", "User context not found")
|
||
return
|
||
}
|
||
|
||
// 读取请求体
|
||
body, err := io.ReadAll(c.Request.Body)
|
||
if err != nil {
|
||
if maxErr, ok := extractMaxBytesError(err); ok {
|
||
h.errorResponse(c, http.StatusRequestEntityTooLarge, "invalid_request_error", buildBodyTooLargeMessage(maxErr.Limit))
|
||
return
|
||
}
|
||
h.errorResponse(c, http.StatusBadRequest, "invalid_request_error", "Failed to read request body")
|
||
return
|
||
}
|
||
|
||
if len(body) == 0 {
|
||
h.errorResponse(c, http.StatusBadRequest, "invalid_request_error", "Request body is empty")
|
||
return
|
||
}
|
||
|
||
parsedReq, err := service.ParseGatewayRequest(body)
|
||
if err != nil {
|
||
h.errorResponse(c, http.StatusBadRequest, "invalid_request_error", "Failed to parse request body")
|
||
return
|
||
}
|
||
reqModel := parsedReq.Model
|
||
reqStream := parsedReq.Stream
|
||
|
||
// 验证 model 必填
|
||
if reqModel == "" {
|
||
h.errorResponse(c, http.StatusBadRequest, "invalid_request_error", "model is required")
|
||
return
|
||
}
|
||
|
||
// Track if we've started streaming (for error handling)
|
||
streamStarted := false
|
||
|
||
// 获取订阅信息（可能为nil）- 提前获取用于后续检查
|
||
subscription, _ := middleware2.GetSubscriptionFromContext(c)
|
||
|
||
// 0. 检查wait队列是否已满
|
||
maxWait := service.CalculateMaxWait(subject.Concurrency)
|
||
canWait, err := h.concurrencyHelper.IncrementWaitCount(c.Request.Context(), subject.UserID, maxWait)
|
||
if err != nil {
|
||
log.Printf("Increment wait count failed: %v", err)
|
||
// On error, allow request to proceed
|
||
} else if !canWait {
|
||
h.errorResponse(c, http.StatusTooManyRequests, "rate_limit_error", "Too many pending requests, please retry later")
|
||
return
|
||
}
|
||
// 确保在函数退出时减少wait计数
|
||
defer h.concurrencyHelper.DecrementWaitCount(c.Request.Context(), subject.UserID)
|
||
|
||
// 1. 首先获取用户并发槽位
|
||
userReleaseFunc, err := h.concurrencyHelper.AcquireUserSlotWithWait(c, subject.UserID, subject.Concurrency, reqStream, &streamStarted)
|
||
if err != nil {
|
||
log.Printf("User concurrency acquire failed: %v", err)
|
||
h.handleConcurrencyError(c, err, "user", streamStarted)
|
||
return
|
||
}
|
||
if userReleaseFunc != nil {
|
||
defer userReleaseFunc()
|
||
}
|
||
|
||
// 2. 【新增】Wait后二次检查余额/订阅
|
||
if err := h.billingCacheService.CheckBillingEligibility(c.Request.Context(), apiKey.User, apiKey, apiKey.Group, subscription); err != nil {
|
||
log.Printf("Billing eligibility check failed after wait: %v", err)
|
||
h.handleStreamingAwareError(c, http.StatusForbidden, "billing_error", err.Error(), streamStarted)
|
||
return
|
||
}
|
||
|
||
// 计算粘性会话hash
|
||
sessionHash := h.gatewayService.GenerateSessionHash(parsedReq)
|
||
|
||
// 获取平台：优先使用强制平台（/antigravity 路由，中间件已设置 request.Context），否则使用分组平台
|
||
platform := ""
|
||
if forcePlatform, ok := middleware2.GetForcePlatformFromContext(c); ok {
|
||
platform = forcePlatform
|
||
} else if apiKey.Group != nil {
|
||
platform = apiKey.Group.Platform
|
||
}
|
||
sessionKey := sessionHash
|
||
if platform == service.PlatformGemini && sessionHash != "" {
|
||
sessionKey = "gemini:" + sessionHash
|
||
}
|
||
|
||
if platform == service.PlatformGemini {
|
||
const maxAccountSwitches = 3
|
||
switchCount := 0
|
||
failedAccountIDs := make(map[int64]struct{})
|
||
lastFailoverStatus := 0
|
||
|
||
for {
|
||
selection, err := h.gatewayService.SelectAccountWithLoadAwareness(c.Request.Context(), apiKey.GroupID, sessionKey, reqModel, failedAccountIDs)
|
||
if err != nil {
|
||
if len(failedAccountIDs) == 0 {
|
||
h.handleStreamingAwareError(c, http.StatusServiceUnavailable, "api_error", "No available accounts: "+err.Error(), streamStarted)
|
||
return
|
||
}
|
||
h.handleFailoverExhausted(c, lastFailoverStatus, streamStarted)
|
||
return
|
||
}
|
||
account := selection.Account
|
||
|
||
// 检查预热请求拦截（在账号选择后、转发前检查）
|
||
if account.IsInterceptWarmupEnabled() && isWarmupRequest(body) {
|
||
if selection.Acquired && selection.ReleaseFunc != nil {
|
||
selection.ReleaseFunc()
|
||
}
|
||
if reqStream {
|
||
sendMockWarmupStream(c, reqModel)
|
||
} else {
|
||
sendMockWarmupResponse(c, reqModel)
|
||
}
|
||
return
|
||
}
|
||
|
||
// 3. 获取账号并发槽位
|
||
accountReleaseFunc := selection.ReleaseFunc
|
||
var accountWaitRelease func()
|
||
if !selection.Acquired {
|
||
if selection.WaitPlan == nil {
|
||
h.handleStreamingAwareError(c, http.StatusServiceUnavailable, "api_error", "No available accounts", streamStarted)
|
||
return
|
||
}
|
||
canWait, err := h.concurrencyHelper.IncrementAccountWaitCount(c.Request.Context(), account.ID, selection.WaitPlan.MaxWaiting)
|
||
if err != nil {
|
||
log.Printf("Increment account wait count failed: %v", err)
|
||
} else if !canWait {
|
||
log.Printf("Account wait queue full: account=%d", account.ID)
|
||
h.handleStreamingAwareError(c, http.StatusTooManyRequests, "rate_limit_error", "Too many pending requests, please retry later", streamStarted)
|
||
return
|
||
} else {
|
||
// Only set release function if increment succeeded
|
||
accountWaitRelease = func() {
|
||
h.concurrencyHelper.DecrementAccountWaitCount(c.Request.Context(), account.ID)
|
||
}
|
||
}
|
||
|
||
accountReleaseFunc, err = h.concurrencyHelper.AcquireAccountSlotWithWaitTimeout(
|
||
c,
|
||
account.ID,
|
||
selection.WaitPlan.MaxConcurrency,
|
||
selection.WaitPlan.Timeout,
|
||
reqStream,
|
||
&streamStarted,
|
||
)
|
||
if err != nil {
|
||
if accountWaitRelease != nil {
|
||
accountWaitRelease()
|
||
}
|
||
log.Printf("Account concurrency acquire failed: %v", err)
|
||
h.handleConcurrencyError(c, err, "account", streamStarted)
|
||
return
|
||
}
|
||
if err := h.gatewayService.BindStickySession(c.Request.Context(), sessionKey, account.ID); err != nil {
|
||
log.Printf("Bind sticky session failed: %v", err)
|
||
}
|
||
}
|
||
|
||
// 转发请求 - 根据账号平台分流
|
||
var result *service.ForwardResult
|
||
if account.Platform == service.PlatformAntigravity {
|
||
result, err = h.antigravityGatewayService.ForwardGemini(c.Request.Context(), c, account, reqModel, "generateContent", reqStream, body)
|
||
} else {
|
||
result, err = h.geminiCompatService.Forward(c.Request.Context(), c, account, body)
|
||
}
|
||
if accountReleaseFunc != nil {
|
||
accountReleaseFunc()
|
||
}
|
||
if accountWaitRelease != nil {
|
||
accountWaitRelease()
|
||
}
|
||
if err != nil {
|
||
var failoverErr *service.UpstreamFailoverError
|
||
if errors.As(err, &failoverErr) {
|
||
failedAccountIDs[account.ID] = struct{}{}
|
||
if switchCount >= maxAccountSwitches {
|
||
lastFailoverStatus = failoverErr.StatusCode
|
||
h.handleFailoverExhausted(c, lastFailoverStatus, streamStarted)
|
||
return
|
||
}
|
||
lastFailoverStatus = failoverErr.StatusCode
|
||
switchCount++
|
||
log.Printf("Account %d: upstream error %d, switching account %d/%d", account.ID, failoverErr.StatusCode, switchCount, maxAccountSwitches)
|
||
continue
|
||
}
|
||
// 错误响应已在Forward中处理，这里只记录日志
|
||
log.Printf("Forward request failed: %v", err)
|
||
return
|
||
}
|
||
|
||
// 异步记录使用量（subscription已在函数开头获取）
|
||
go func(result *service.ForwardResult, usedAccount *service.Account) {
|
||
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
|
||
defer cancel()
|
||
if err := h.gatewayService.RecordUsage(ctx, &service.RecordUsageInput{
|
||
Result: result,
|
||
APIKey: apiKey,
|
||
User: apiKey.User,
|
||
Account: usedAccount,
|
||
Subscription: subscription,
|
||
}); err != nil {
|
||
log.Printf("Record usage failed: %v", err)
|
||
}
|
||
}(result, account)
|
||
return
|
||
}
|
||
}
|
||
|
||
const maxAccountSwitches = 10
|
||
switchCount := 0
|
||
failedAccountIDs := make(map[int64]struct{})
|
||
lastFailoverStatus := 0
|
||
|
||
for {
|
||
// 选择支持该模型的账号
|
||
selection, err := h.gatewayService.SelectAccountWithLoadAwareness(c.Request.Context(), apiKey.GroupID, sessionKey, reqModel, failedAccountIDs)
|
||
if err != nil {
|
||
if len(failedAccountIDs) == 0 {
|
||
h.handleStreamingAwareError(c, http.StatusServiceUnavailable, "api_error", "No available accounts: "+err.Error(), streamStarted)
|
||
return
|
||
}
|
||
h.handleFailoverExhausted(c, lastFailoverStatus, streamStarted)
|
||
return
|
||
}
|
||
account := selection.Account
|
||
|
||
// 检查预热请求拦截（在账号选择后、转发前检查）
|
||
if account.IsInterceptWarmupEnabled() && isWarmupRequest(body) {
|
||
if selection.Acquired && selection.ReleaseFunc != nil {
|
||
selection.ReleaseFunc()
|
||
}
|
||
if reqStream {
|
||
sendMockWarmupStream(c, reqModel)
|
||
} else {
|
||
sendMockWarmupResponse(c, reqModel)
|
||
}
|
||
return
|
||
}
|
||
|
||
// 3. 获取账号并发槽位
|
||
accountReleaseFunc := selection.ReleaseFunc
|
||
var accountWaitRelease func()
|
||
if !selection.Acquired {
|
||
if selection.WaitPlan == nil {
|
||
h.handleStreamingAwareError(c, http.StatusServiceUnavailable, "api_error", "No available accounts", streamStarted)
|
||
return
|
||
}
|
||
canWait, err := h.concurrencyHelper.IncrementAccountWaitCount(c.Request.Context(), account.ID, selection.WaitPlan.MaxWaiting)
|
||
if err != nil {
|
||
log.Printf("Increment account wait count failed: %v", err)
|
||
} else if !canWait {
|
||
log.Printf("Account wait queue full: account=%d", account.ID)
|
||
h.handleStreamingAwareError(c, http.StatusTooManyRequests, "rate_limit_error", "Too many pending requests, please retry later", streamStarted)
|
||
return
|
||
} else {
|
||
// Only set release function if increment succeeded
|
||
accountWaitRelease = func() {
|
||
h.concurrencyHelper.DecrementAccountWaitCount(c.Request.Context(), account.ID)
|
||
}
|
||
}
|
||
|
||
accountReleaseFunc, err = h.concurrencyHelper.AcquireAccountSlotWithWaitTimeout(
|
||
c,
|
||
account.ID,
|
||
selection.WaitPlan.MaxConcurrency,
|
||
selection.WaitPlan.Timeout,
|
||
reqStream,
|
||
&streamStarted,
|
||
)
|
||
if err != nil {
|
||
if accountWaitRelease != nil {
|
||
accountWaitRelease()
|
||
}
|
||
log.Printf("Account concurrency acquire failed: %v", err)
|
||
h.handleConcurrencyError(c, err, "account", streamStarted)
|
||
return
|
||
}
|
||
if err := h.gatewayService.BindStickySession(c.Request.Context(), sessionKey, account.ID); err != nil {
|
||
log.Printf("Bind sticky session failed: %v", err)
|
||
}
|
||
}
|
||
|
||
// 转发请求 - 根据账号平台分流
|
||
var result *service.ForwardResult
|
||
if account.Platform == service.PlatformAntigravity {
|
||
result, err = h.antigravityGatewayService.Forward(c.Request.Context(), c, account, body)
|
||
} else {
|
||
result, err = h.gatewayService.Forward(c.Request.Context(), c, account, parsedReq)
|
||
}
|
||
if accountReleaseFunc != nil {
|
||
accountReleaseFunc()
|
||
}
|
||
if accountWaitRelease != nil {
|
||
accountWaitRelease()
|
||
}
|
||
if err != nil {
|
||
var failoverErr *service.UpstreamFailoverError
|
||
if errors.As(err, &failoverErr) {
|
||
failedAccountIDs[account.ID] = struct{}{}
|
||
if switchCount >= maxAccountSwitches {
|
||
lastFailoverStatus = failoverErr.StatusCode
|
||
h.handleFailoverExhausted(c, lastFailoverStatus, streamStarted)
|
||
return
|
||
}
|
||
lastFailoverStatus = failoverErr.StatusCode
|
||
switchCount++
|
||
log.Printf("Account %d: upstream error %d, switching account %d/%d", account.ID, failoverErr.StatusCode, switchCount, maxAccountSwitches)
|
||
continue
|
||
}
|
||
// 错误响应已在Forward中处理，这里只记录日志
|
||
log.Printf("Account %d: Forward request failed: %v", account.ID, err)
|
||
return
|
||
}
|
||
|
||
// 异步记录使用量（subscription已在函数开头获取）
|
||
go func(result *service.ForwardResult, usedAccount *service.Account) {
|
||
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
|
||
defer cancel()
|
||
if err := h.gatewayService.RecordUsage(ctx, &service.RecordUsageInput{
|
||
Result: result,
|
||
APIKey: apiKey,
|
||
User: apiKey.User,
|
||
Account: usedAccount,
|
||
Subscription: subscription,
|
||
}); err != nil {
|
||
log.Printf("Record usage failed: %v", err)
|
||
}
|
||
}(result, account)
|
||
return
|
||
}
|
||
}
|
||
|
||
// Models handles listing available models
|
||
// GET /v1/models
|
||
// Returns models based on account configurations (model_mapping whitelist)
|
||
// Falls back to default models if no whitelist is configured
|
||
func (h *GatewayHandler) Models(c *gin.Context) {
|
||
apiKey, _ := middleware2.GetAPIKeyFromContext(c)
|
||
|
||
var groupID *int64
|
||
var platform string
|
||
|
||
if apiKey != nil && apiKey.Group != nil {
|
||
groupID = &apiKey.Group.ID
|
||
platform = apiKey.Group.Platform
|
||
}
|
||
|
||
// Get available models from account configurations (without platform filter)
|
||
availableModels := h.gatewayService.GetAvailableModels(c.Request.Context(), groupID, "")
|
||
|
||
if len(availableModels) > 0 {
|
||
// Build model list from whitelist
|
||
models := make([]claude.Model, 0, len(availableModels))
|
||
for _, modelID := range availableModels {
|
||
models = append(models, claude.Model{
|
||
ID: modelID,
|
||
Type: "model",
|
||
DisplayName: modelID,
|
||
CreatedAt: "2024-01-01T00:00:00Z",
|
||
})
|
||
}
|
||
c.JSON(http.StatusOK, gin.H{
|
||
"object": "list",
|
||
"data": models,
|
||
})
|
||
return
|
||
}
|
||
|
||
// Fallback to default models
|
||
if platform == "openai" {
|
||
c.JSON(http.StatusOK, gin.H{
|
||
"object": "list",
|
||
"data": openai.DefaultModels,
|
||
})
|
||
return
|
||
}
|
||
|
||
c.JSON(http.StatusOK, gin.H{
|
||
"object": "list",
|
||
"data": claude.DefaultModels,
|
||
})
|
||
}
|
||
|
||
// AntigravityModels 返回 Antigravity 支持的全部模型
|
||
// GET /antigravity/models
|
||
func (h *GatewayHandler) AntigravityModels(c *gin.Context) {
|
||
c.JSON(http.StatusOK, gin.H{
|
||
"object": "list",
|
||
"data": antigravity.DefaultModels(),
|
||
})
|
||
}
|
||
|
||
// Usage handles getting account balance for CC Switch integration
|
||
// GET /v1/usage
|
||
func (h *GatewayHandler) Usage(c *gin.Context) {
|
||
apiKey, ok := middleware2.GetAPIKeyFromContext(c)
|
||
if !ok {
|
||
h.errorResponse(c, http.StatusUnauthorized, "authentication_error", "Invalid API key")
|
||
return
|
||
}
|
||
|
||
subject, ok := middleware2.GetAuthSubjectFromContext(c)
|
||
if !ok {
|
||
h.errorResponse(c, http.StatusUnauthorized, "authentication_error", "Invalid API key")
|
||
return
|
||
}
|
||
|
||
// 订阅模式：返回订阅限额信息
|
||
if apiKey.Group != nil && apiKey.Group.IsSubscriptionType() {
|
||
subscription, ok := middleware2.GetSubscriptionFromContext(c)
|
||
if !ok {
|
||
h.errorResponse(c, http.StatusForbidden, "subscription_error", "No active subscription")
|
||
return
|
||
}
|
||
|
||
remaining := h.calculateSubscriptionRemaining(apiKey.Group, subscription)
|
||
c.JSON(http.StatusOK, gin.H{
|
||
"isValid": true,
|
||
"planName": apiKey.Group.Name,
|
||
"remaining": remaining,
|
||
"unit": "USD",
|
||
})
|
||
return
|
||
}
|
||
|
||
// 余额模式：返回钱包余额
|
||
latestUser, err := h.userService.GetByID(c.Request.Context(), subject.UserID)
|
||
if err != nil {
|
||
h.errorResponse(c, http.StatusInternalServerError, "api_error", "Failed to get user info")
|
||
return
|
||
}
|
||
|
||
c.JSON(http.StatusOK, gin.H{
|
||
"isValid": true,
|
||
"planName": "钱包余额",
|
||
"remaining": latestUser.Balance,
|
||
"unit": "USD",
|
||
})
|
||
}
|
||
|
||
// calculateSubscriptionRemaining 计算订阅剩余可用额度
|
||
// 逻辑：
|
||
// 1. 如果日/周/月任一限额达到100%，返回0
|
||
// 2. 否则返回所有已配置周期中剩余额度的最小值
|
||
func (h *GatewayHandler) calculateSubscriptionRemaining(group *service.Group, sub *service.UserSubscription) float64 {
|
||
var remainingValues []float64
|
||
|
||
// 检查日限额
|
||
if group.HasDailyLimit() {
|
||
remaining := *group.DailyLimitUSD - sub.DailyUsageUSD
|
||
if remaining <= 0 {
|
||
return 0
|
||
}
|
||
remainingValues = append(remainingValues, remaining)
|
||
}
|
||
|
||
// 检查周限额
|
||
if group.HasWeeklyLimit() {
|
||
remaining := *group.WeeklyLimitUSD - sub.WeeklyUsageUSD
|
||
if remaining <= 0 {
|
||
return 0
|
||
}
|
||
remainingValues = append(remainingValues, remaining)
|
||
}
|
||
|
||
// 检查月限额
|
||
if group.HasMonthlyLimit() {
|
||
remaining := *group.MonthlyLimitUSD - sub.MonthlyUsageUSD
|
||
if remaining <= 0 {
|
||
return 0
|
||
}
|
||
remainingValues = append(remainingValues, remaining)
|
||
}
|
||
|
||
// 如果没有配置任何限额，返回-1表示无限制
|
||
if len(remainingValues) == 0 {
|
||
return -1
|
||
}
|
||
|
||
// 返回最小值
|
||
min := remainingValues[0]
|
||
for _, v := range remainingValues[1:] {
|
||
if v < min {
|
||
min = v
|
||
}
|
||
}
|
||
return min
|
||
}
|
||
|
||
// handleConcurrencyError handles concurrency-related errors with proper 429 response
|
||
func (h *GatewayHandler) handleConcurrencyError(c *gin.Context, err error, slotType string, streamStarted bool) {
|
||
h.handleStreamingAwareError(c, http.StatusTooManyRequests, "rate_limit_error",
|
||
fmt.Sprintf("Concurrency limit exceeded for %s, please retry later", slotType), streamStarted)
|
||
}
|
||
|
||
func (h *GatewayHandler) handleFailoverExhausted(c *gin.Context, statusCode int, streamStarted bool) {
|
||
status, errType, errMsg := h.mapUpstreamError(statusCode)
|
||
h.handleStreamingAwareError(c, status, errType, errMsg, streamStarted)
|
||
}
|
||
|
||
func (h *GatewayHandler) mapUpstreamError(statusCode int) (int, string, string) {
|
||
switch statusCode {
|
||
case 401:
|
||
return http.StatusBadGateway, "upstream_error", "Upstream authentication failed, please contact administrator"
|
||
case 403:
|
||
return http.StatusBadGateway, "upstream_error", "Upstream access forbidden, please contact administrator"
|
||
case 429:
|
||
return http.StatusTooManyRequests, "rate_limit_error", "Upstream rate limit exceeded, please retry later"
|
||
case 529:
|
||
return http.StatusServiceUnavailable, "overloaded_error", "Upstream service overloaded, please retry later"
|
||
case 500, 502, 503, 504:
|
||
return http.StatusBadGateway, "upstream_error", "Upstream service temporarily unavailable"
|
||
default:
|
||
return http.StatusBadGateway, "upstream_error", "Upstream request failed"
|
||
}
|
||
}
|
||
|
||
// handleStreamingAwareError handles errors that may occur after streaming has started
|
||
func (h *GatewayHandler) handleStreamingAwareError(c *gin.Context, status int, errType, message string, streamStarted bool) {
|
||
if streamStarted {
|
||
// Stream already started, send error as SSE event then close
|
||
flusher, ok := c.Writer.(http.Flusher)
|
||
if ok {
|
||
// Send error event in SSE format with proper JSON marshaling
|
||
errorData := map[string]any{
|
||
"type": "error",
|
||
"error": map[string]string{
|
||
"type": errType,
|
||
"message": message,
|
||
},
|
||
}
|
||
jsonBytes, err := json.Marshal(errorData)
|
||
if err != nil {
|
||
_ = c.Error(err)
|
||
return
|
||
}
|
||
errorEvent := fmt.Sprintf("data: %s\n\n", string(jsonBytes))
|
||
if _, err := fmt.Fprint(c.Writer, errorEvent); err != nil {
|
||
_ = c.Error(err)
|
||
}
|
||
flusher.Flush()
|
||
}
|
||
return
|
||
}
|
||
|
||
// Normal case: return JSON response with proper status code
|
||
h.errorResponse(c, status, errType, message)
|
||
}
|
||
|
||
// errorResponse 返回Claude API格式的错误响应
|
||
func (h *GatewayHandler) errorResponse(c *gin.Context, status int, errType, message string) {
|
||
c.JSON(status, gin.H{
|
||
"type": "error",
|
||
"error": gin.H{
|
||
"type": errType,
|
||
"message": message,
|
||
},
|
||
})
|
||
}
|
||
|
||
// CountTokens handles token counting endpoint
|
||
// POST /v1/messages/count_tokens
|
||
// 特点：校验订阅/余额，但不计算并发、不记录使用量
|
||
func (h *GatewayHandler) CountTokens(c *gin.Context) {
|
||
// 从context获取apiKey和user（ApiKeyAuth中间件已设置）
|
||
apiKey, ok := middleware2.GetAPIKeyFromContext(c)
|
||
if !ok {
|
||
h.errorResponse(c, http.StatusUnauthorized, "authentication_error", "Invalid API key")
|
||
return
|
||
}
|
||
|
||
_, ok = middleware2.GetAuthSubjectFromContext(c)
|
||
if !ok {
|
||
h.errorResponse(c, http.StatusInternalServerError, "api_error", "User context not found")
|
||
return
|
||
}
|
||
|
||
// 读取请求体
|
||
body, err := io.ReadAll(c.Request.Body)
|
||
if err != nil {
|
||
if maxErr, ok := extractMaxBytesError(err); ok {
|
||
h.errorResponse(c, http.StatusRequestEntityTooLarge, "invalid_request_error", buildBodyTooLargeMessage(maxErr.Limit))
|
||
return
|
||
}
|
||
h.errorResponse(c, http.StatusBadRequest, "invalid_request_error", "Failed to read request body")
|
||
return
|
||
}
|
||
|
||
if len(body) == 0 {
|
||
h.errorResponse(c, http.StatusBadRequest, "invalid_request_error", "Request body is empty")
|
||
return
|
||
}
|
||
|
||
parsedReq, err := service.ParseGatewayRequest(body)
|
||
if err != nil {
|
||
h.errorResponse(c, http.StatusBadRequest, "invalid_request_error", "Failed to parse request body")
|
||
return
|
||
}
|
||
|
||
// 验证 model 必填
|
||
if parsedReq.Model == "" {
|
||
h.errorResponse(c, http.StatusBadRequest, "invalid_request_error", "model is required")
|
||
return
|
||
}
|
||
|
||
// 获取订阅信息（可能为nil）
|
||
subscription, _ := middleware2.GetSubscriptionFromContext(c)
|
||
|
||
// 校验 billing eligibility（订阅/余额）
|
||
// 【注意】不计算并发，但需要校验订阅/余额
|
||
if err := h.billingCacheService.CheckBillingEligibility(c.Request.Context(), apiKey.User, apiKey, apiKey.Group, subscription); err != nil {
|
||
h.errorResponse(c, http.StatusForbidden, "billing_error", err.Error())
|
||
return
|
||
}
|
||
|
||
// 计算粘性会话 hash
|
||
sessionHash := h.gatewayService.GenerateSessionHash(parsedReq)
|
||
|
||
// 选择支持该模型的账号
|
||
account, err := h.gatewayService.SelectAccountForModel(c.Request.Context(), apiKey.GroupID, sessionHash, parsedReq.Model)
|
||
if err != nil {
|
||
h.errorResponse(c, http.StatusServiceUnavailable, "api_error", "No available accounts: "+err.Error())
|
||
return
|
||
}
|
||
|
||
// 转发请求（不记录使用量）
|
||
if err := h.gatewayService.ForwardCountTokens(c.Request.Context(), c, account, parsedReq); err != nil {
|
||
log.Printf("Forward count_tokens request failed: %v", err)
|
||
// 错误响应已在 ForwardCountTokens 中处理
|
||
return
|
||
}
|
||
}
|
||
|
||
// isWarmupRequest 检测是否为预热请求（标题生成、Warmup等）
|
||
func isWarmupRequest(body []byte) bool {
|
||
// 快速检查：如果body不包含关键字，直接返回false
|
||
bodyStr := string(body)
|
||
if !strings.Contains(bodyStr, "title") && !strings.Contains(bodyStr, "Warmup") {
|
||
return false
|
||
}
|
||
|
||
// 解析完整请求
|
||
var req struct {
|
||
Messages []struct {
|
||
Content []struct {
|
||
Type string `json:"type"`
|
||
Text string `json:"text"`
|
||
} `json:"content"`
|
||
} `json:"messages"`
|
||
System []struct {
|
||
Text string `json:"text"`
|
||
} `json:"system"`
|
||
}
|
||
if err := json.Unmarshal(body, &req); err != nil {
|
||
return false
|
||
}
|
||
|
||
// 检查 messages 中的标题提示模式
|
||
for _, msg := range req.Messages {
|
||
for _, content := range msg.Content {
|
||
if content.Type == "text" {
|
||
if strings.Contains(content.Text, "Please write a 5-10 word title for the following conversation:") ||
|
||
content.Text == "Warmup" {
|
||
return true
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
// 检查 system 中的标题提取模式
|
||
for _, system := range req.System {
|
||
if strings.Contains(system.Text, "nalyze if this message indicates a new conversation topic. If it does, extract a 2-3 word title") {
|
||
return true
|
||
}
|
||
}
|
||
|
||
return false
|
||
}
|
||
|
||
// sendMockWarmupStream 发送流式 mock 响应（用于预热请求拦截）
|
||
func sendMockWarmupStream(c *gin.Context, model string) {
|
||
c.Header("Content-Type", "text/event-stream")
|
||
c.Header("Cache-Control", "no-cache")
|
||
c.Header("Connection", "keep-alive")
|
||
c.Header("X-Accel-Buffering", "no")
|
||
|
||
// Build message_start event with proper JSON marshaling
|
||
messageStart := map[string]any{
|
||
"type": "message_start",
|
||
"message": map[string]any{
|
||
"id": "msg_mock_warmup",
|
||
"type": "message",
|
||
"role": "assistant",
|
||
"model": model,
|
||
"content": []any{},
|
||
"stop_reason": nil,
|
||
"stop_sequence": nil,
|
||
"usage": map[string]int{
|
||
"input_tokens": 10,
|
||
"output_tokens": 0,
|
||
},
|
||
},
|
||
}
|
||
messageStartJSON, _ := json.Marshal(messageStart)
|
||
|
||
events := []string{
|
||
`event: message_start` + "\n" + `data: ` + string(messageStartJSON),
|
||
`event: content_block_start` + "\n" + `data: {"content_block":{"text":"","type":"text"},"index":0,"type":"content_block_start"}`,
|
||
`event: content_block_delta` + "\n" + `data: {"delta":{"text":"New","type":"text_delta"},"index":0,"type":"content_block_delta"}`,
|
||
`event: content_block_delta` + "\n" + `data: {"delta":{"text":" Conversation","type":"text_delta"},"index":0,"type":"content_block_delta"}`,
|
||
`event: content_block_stop` + "\n" + `data: {"index":0,"type":"content_block_stop"}`,
|
||
`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,
|
||
},
|
||
})
|
||
}
|