419 lines
15 KiB
Go
419 lines
15 KiB
Go
package handler
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import (
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"context"
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"encoding/json"
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"errors"
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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/config"
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"github.com/Wei-Shaw/sub2api/internal/pkg/ip"
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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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// OpenAIGatewayHandler handles OpenAI API gateway requests
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type OpenAIGatewayHandler struct {
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gatewayService *service.OpenAIGatewayService
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billingCacheService *service.BillingCacheService
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apiKeyService *service.APIKeyService
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errorPassthroughService *service.ErrorPassthroughService
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concurrencyHelper *ConcurrencyHelper
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maxAccountSwitches int
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}
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// NewOpenAIGatewayHandler creates a new OpenAIGatewayHandler
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func NewOpenAIGatewayHandler(
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gatewayService *service.OpenAIGatewayService,
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concurrencyService *service.ConcurrencyService,
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billingCacheService *service.BillingCacheService,
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apiKeyService *service.APIKeyService,
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errorPassthroughService *service.ErrorPassthroughService,
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cfg *config.Config,
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) *OpenAIGatewayHandler {
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pingInterval := time.Duration(0)
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maxAccountSwitches := 3
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if cfg != nil {
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pingInterval = time.Duration(cfg.Concurrency.PingInterval) * time.Second
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if cfg.Gateway.MaxAccountSwitches > 0 {
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maxAccountSwitches = cfg.Gateway.MaxAccountSwitches
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}
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}
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return &OpenAIGatewayHandler{
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gatewayService: gatewayService,
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billingCacheService: billingCacheService,
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apiKeyService: apiKeyService,
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errorPassthroughService: errorPassthroughService,
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concurrencyHelper: NewConcurrencyHelper(concurrencyService, SSEPingFormatComment, pingInterval),
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maxAccountSwitches: maxAccountSwitches,
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}
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}
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// Responses handles OpenAI Responses API endpoint
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// POST /openai/v1/responses
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func (h *OpenAIGatewayHandler) Responses(c *gin.Context) {
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// Get apiKey and user from context (set by ApiKeyAuth middleware)
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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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// Read request body
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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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h.errorResponse(c, http.StatusRequestEntityTooLarge, "invalid_request_error", buildBodyTooLargeMessage(maxErr.Limit))
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return
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}
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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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setOpsRequestContext(c, "", false, body)
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// Parse request body to map for potential modification
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var reqBody map[string]any
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if err := json.Unmarshal(body, &reqBody); 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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// Extract model and stream
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reqModel, _ := reqBody["model"].(string)
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reqStream, _ := reqBody["stream"].(bool)
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// 验证 model 必填
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if reqModel == "" {
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h.errorResponse(c, http.StatusBadRequest, "invalid_request_error", "model is required")
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return
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}
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userAgent := c.GetHeader("User-Agent")
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if !openai.IsCodexCLIRequest(userAgent) {
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existingInstructions, _ := reqBody["instructions"].(string)
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if strings.TrimSpace(existingInstructions) == "" {
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if instructions := strings.TrimSpace(service.GetOpenCodeInstructions()); instructions != "" {
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reqBody["instructions"] = instructions
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// Re-serialize body
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body, err = json.Marshal(reqBody)
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if err != nil {
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h.errorResponse(c, http.StatusInternalServerError, "api_error", "Failed to process request")
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return
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}
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}
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}
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}
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setOpsRequestContext(c, reqModel, reqStream, body)
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// 提前校验 function_call_output 是否具备可关联上下文，避免上游 400。
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// 要求 previous_response_id，或 input 内存在带 call_id 的 tool_call/function_call，
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// 或带 id 且与 call_id 匹配的 item_reference。
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if service.HasFunctionCallOutput(reqBody) {
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previousResponseID, _ := reqBody["previous_response_id"].(string)
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if strings.TrimSpace(previousResponseID) == "" && !service.HasToolCallContext(reqBody) {
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if service.HasFunctionCallOutputMissingCallID(reqBody) {
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log.Printf("[OpenAI Handler] function_call_output 缺少 call_id: model=%s", reqModel)
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h.errorResponse(c, http.StatusBadRequest, "invalid_request_error", "function_call_output requires call_id or previous_response_id; if relying on history, ensure store=true and reuse previous_response_id")
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return
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}
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callIDs := service.FunctionCallOutputCallIDs(reqBody)
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if !service.HasItemReferenceForCallIDs(reqBody, callIDs) {
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log.Printf("[OpenAI Handler] function_call_output 缺少匹配的 item_reference: model=%s", reqModel)
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h.errorResponse(c, http.StatusBadRequest, "invalid_request_error", "function_call_output requires item_reference ids matching each call_id, or previous_response_id/tool_call context; if relying on history, ensure store=true and reuse previous_response_id")
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return
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}
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}
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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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// 绑定错误透传服务，允许 service 层在非 failover 错误场景复用规则。
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if h.errorPassthroughService != nil {
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service.BindErrorPassthroughService(c, h.errorPassthroughService)
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}
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// Get subscription info (may be nil)
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subscription, _ := middleware2.GetSubscriptionFromContext(c)
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// 0. Check if wait queue is full
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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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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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// 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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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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h.concurrencyHelper.DecrementWaitCount(c.Request.Context(), subject.UserID)
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}
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}()
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// 1. First acquire user concurrency slot
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userReleaseFunc, err := h.concurrencyHelper.AcquireUserSlotWithWait(c, subject.UserID, subject.Concurrency, reqStream, &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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// User slot acquired: no longer waiting.
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if waitCounted {
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h.concurrencyHelper.DecrementWaitCount(c.Request.Context(), subject.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. Re-check billing eligibility 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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log.Printf("Billing eligibility check failed after wait: %v", err)
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status, code, message := billingErrorDetails(err)
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h.handleStreamingAwareError(c, status, code, message, streamStarted)
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return
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}
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// Generate session hash (header first; fallback to prompt_cache_key)
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sessionHash := h.gatewayService.GenerateSessionHash(c, reqBody)
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maxAccountSwitches := h.maxAccountSwitches
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switchCount := 0
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failedAccountIDs := make(map[int64]struct{})
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var lastFailoverErr *service.UpstreamFailoverError
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for {
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// Select account supporting the requested model
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log.Printf("[OpenAI Handler] Selecting account: groupID=%v model=%s", apiKey.GroupID, reqModel)
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selection, err := h.gatewayService.SelectAccountWithLoadAwareness(c.Request.Context(), apiKey.GroupID, sessionHash, reqModel, failedAccountIDs)
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if err != nil {
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log.Printf("[OpenAI Handler] SelectAccount failed: %v", err)
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if len(failedAccountIDs) == 0 {
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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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if lastFailoverErr != nil {
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h.handleFailoverExhausted(c, lastFailoverErr, streamStarted)
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} else {
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h.handleFailoverExhaustedSimple(c, 502, streamStarted)
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}
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return
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}
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account := selection.Account
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log.Printf("[OpenAI Handler] Selected account: id=%d name=%s", account.ID, account.Name)
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setOpsSelectedAccount(c, account.ID)
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// 3. Acquire 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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h.handleStreamingAwareError(c, http.StatusServiceUnavailable, "api_error", "No available accounts", streamStarted)
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return
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}
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accountWaitCounted := false
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canWait, err := h.concurrencyHelper.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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h.handleStreamingAwareError(c, http.StatusTooManyRequests, "rate_limit_error", "Too many pending requests, please retry later", streamStarted)
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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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h.concurrencyHelper.DecrementAccountWaitCount(c.Request.Context(), account.ID)
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}
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}()
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accountReleaseFunc, err = h.concurrencyHelper.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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reqStream,
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&streamStarted,
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)
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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 accountWaitCounted {
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h.concurrencyHelper.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, sessionHash, 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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// Forward request
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result, err := h.gatewayService.Forward(c.Request.Context(), c, account, body)
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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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lastFailoverErr = failoverErr
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if switchCount >= maxAccountSwitches {
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h.handleFailoverExhausted(c, failoverErr, streamStarted)
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return
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}
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switchCount++
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log.Printf("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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// Error response already handled in Forward, just log
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log.Printf("Account %d: Forward request failed: %v", account.ID, 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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// Async record usage
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go func(result *service.OpenAIForwardResult, 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.OpenAIRecordUsageInput{
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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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APIKeyService: h.apiKeyService,
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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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// handleConcurrencyError handles concurrency-related errors with proper 429 response
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func (h *OpenAIGatewayHandler) 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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func (h *OpenAIGatewayHandler) handleFailoverExhausted(c *gin.Context, failoverErr *service.UpstreamFailoverError, streamStarted bool) {
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statusCode := failoverErr.StatusCode
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responseBody := failoverErr.ResponseBody
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// 先检查透传规则
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if h.errorPassthroughService != nil && len(responseBody) > 0 {
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if rule := h.errorPassthroughService.MatchRule("openai", statusCode, responseBody); rule != nil {
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// 确定响应状态码
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respCode := statusCode
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if !rule.PassthroughCode && rule.ResponseCode != nil {
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respCode = *rule.ResponseCode
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}
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// 确定响应消息
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msg := service.ExtractUpstreamErrorMessage(responseBody)
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if !rule.PassthroughBody && rule.CustomMessage != nil {
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msg = *rule.CustomMessage
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}
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h.handleStreamingAwareError(c, respCode, "upstream_error", msg, streamStarted)
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return
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}
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}
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// 使用默认的错误映射
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status, errType, errMsg := h.mapUpstreamError(statusCode)
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h.handleStreamingAwareError(c, status, errType, errMsg, streamStarted)
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}
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// handleFailoverExhaustedSimple 简化版本，用于没有响应体的情况
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func (h *OpenAIGatewayHandler) handleFailoverExhaustedSimple(c *gin.Context, statusCode int, streamStarted bool) {
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status, errType, errMsg := h.mapUpstreamError(statusCode)
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h.handleStreamingAwareError(c, status, errType, errMsg, streamStarted)
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}
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func (h *OpenAIGatewayHandler) mapUpstreamError(statusCode int) (int, string, string) {
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switch statusCode {
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case 401:
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return http.StatusBadGateway, "upstream_error", "Upstream authentication failed, please contact administrator"
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case 403:
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return http.StatusBadGateway, "upstream_error", "Upstream access forbidden, please contact administrator"
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case 429:
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return http.StatusTooManyRequests, "rate_limit_error", "Upstream rate limit exceeded, please retry later"
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case 529:
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return http.StatusServiceUnavailable, "upstream_error", "Upstream service overloaded, please retry later"
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case 500, 502, 503, 504:
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return http.StatusBadGateway, "upstream_error", "Upstream service temporarily unavailable"
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default:
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return http.StatusBadGateway, "upstream_error", "Upstream request failed"
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}
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}
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// handleStreamingAwareError handles errors that may occur after streaming has started
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func (h *OpenAIGatewayHandler) 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 OpenAI SSE format
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errorEvent := fmt.Sprintf(`event: error`+"\n"+`data: {"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 returns OpenAI API format error response
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func (h *OpenAIGatewayHandler) errorResponse(c *gin.Context, status int, errType, message string) {
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c.JSON(status, gin.H{
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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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