chore: initial public snapshot for github upload
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@@ -0,0 +1,286 @@
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package handler
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import (
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"context"
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"errors"
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"net/http"
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"time"
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pkghttputil "github.com/Wei-Shaw/sub2api/internal/pkg/httputil"
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"github.com/Wei-Shaw/sub2api/internal/pkg/ip"
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"github.com/Wei-Shaw/sub2api/internal/pkg/logger"
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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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"github.com/tidwall/gjson"
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"go.uber.org/zap"
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)
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// ChatCompletions handles OpenAI Chat Completions API requests.
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// POST /v1/chat/completions
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func (h *OpenAIGatewayHandler) ChatCompletions(c *gin.Context) {
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streamStarted := false
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defer h.recoverResponsesPanic(c, &streamStarted)
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requestStart := time.Now()
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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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reqLog := requestLogger(
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c,
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"handler.openai_gateway.chat_completions",
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zap.Int64("user_id", subject.UserID),
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zap.Int64("api_key_id", apiKey.ID),
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zap.Any("group_id", apiKey.GroupID),
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)
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if !h.ensureResponsesDependencies(c, reqLog) {
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return
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}
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body, err := pkghttputil.ReadRequestBodyWithPrealloc(c.Request)
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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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if !gjson.ValidBytes(body) {
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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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modelResult := gjson.GetBytes(body, "model")
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if !modelResult.Exists() || modelResult.Type != gjson.String || modelResult.String() == "" {
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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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reqModel := modelResult.String()
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reqStream := gjson.GetBytes(body, "stream").Bool()
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reqLog = reqLog.With(zap.String("model", reqModel), zap.Bool("stream", reqStream))
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setOpsRequestContext(c, reqModel, reqStream, body)
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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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subscription, _ := middleware2.GetSubscriptionFromContext(c)
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service.SetOpsLatencyMs(c, service.OpsAuthLatencyMsKey, time.Since(requestStart).Milliseconds())
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routingStart := time.Now()
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userReleaseFunc, acquired := h.acquireResponsesUserSlot(c, subject.UserID, subject.Concurrency, reqStream, &streamStarted, reqLog)
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if !acquired {
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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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if err := h.billingCacheService.CheckBillingEligibility(c.Request.Context(), apiKey.User, apiKey, apiKey.Group, subscription); err != nil {
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reqLog.Info("openai_chat_completions.billing_eligibility_check_failed", zap.Error(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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sessionHash := h.gatewayService.GenerateSessionHash(c, body)
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promptCacheKey := h.gatewayService.ExtractSessionID(c, body)
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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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sameAccountRetryCount := make(map[int64]int)
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var lastFailoverErr *service.UpstreamFailoverError
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for {
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c.Set("openai_chat_completions_fallback_model", "")
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reqLog.Debug("openai_chat_completions.account_selecting", zap.Int("excluded_account_count", len(failedAccountIDs)))
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selection, scheduleDecision, err := h.gatewayService.SelectAccountWithScheduler(
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c.Request.Context(),
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apiKey.GroupID,
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"",
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sessionHash,
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reqModel,
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failedAccountIDs,
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service.OpenAIUpstreamTransportAny,
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)
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if err != nil {
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reqLog.Warn("openai_chat_completions.account_select_failed",
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zap.Error(err),
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zap.Int("excluded_account_count", len(failedAccountIDs)),
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)
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if len(failedAccountIDs) == 0 {
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defaultModel := ""
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if apiKey.Group != nil {
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defaultModel = apiKey.Group.DefaultMappedModel
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}
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if defaultModel != "" && defaultModel != reqModel {
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reqLog.Info("openai_chat_completions.fallback_to_default_model",
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zap.String("default_mapped_model", defaultModel),
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)
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selection, scheduleDecision, err = h.gatewayService.SelectAccountWithScheduler(
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c.Request.Context(),
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apiKey.GroupID,
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"",
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sessionHash,
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defaultModel,
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failedAccountIDs,
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service.OpenAIUpstreamTransportAny,
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)
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if err == nil && selection != nil {
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c.Set("openai_chat_completions_fallback_model", defaultModel)
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}
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}
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if err != nil {
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h.handleStreamingAwareError(c, http.StatusServiceUnavailable, "api_error", "Service temporarily unavailable", streamStarted)
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return
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}
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} else {
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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.handleStreamingAwareError(c, http.StatusBadGateway, "api_error", "Upstream request failed", streamStarted)
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}
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return
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}
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}
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if selection == nil || selection.Account == 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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account := selection.Account
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sessionHash = ensureOpenAIPoolModeSessionHash(sessionHash, account)
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reqLog.Debug("openai_chat_completions.account_selected", zap.Int64("account_id", account.ID), zap.String("account_name", account.Name))
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_ = scheduleDecision
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setOpsSelectedAccount(c, account.ID, account.Platform)
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accountReleaseFunc, acquired := h.acquireResponsesAccountSlot(c, apiKey.GroupID, sessionHash, selection, reqStream, &streamStarted, reqLog)
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if !acquired {
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return
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}
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service.SetOpsLatencyMs(c, service.OpsRoutingLatencyMsKey, time.Since(routingStart).Milliseconds())
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forwardStart := time.Now()
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defaultMappedModel := c.GetString("openai_chat_completions_fallback_model")
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result, err := h.gatewayService.ForwardAsChatCompletions(c.Request.Context(), c, account, body, promptCacheKey, defaultMappedModel)
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forwardDurationMs := time.Since(forwardStart).Milliseconds()
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if accountReleaseFunc != nil {
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accountReleaseFunc()
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}
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upstreamLatencyMs, _ := getContextInt64(c, service.OpsUpstreamLatencyMsKey)
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responseLatencyMs := forwardDurationMs
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if upstreamLatencyMs > 0 && forwardDurationMs > upstreamLatencyMs {
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responseLatencyMs = forwardDurationMs - upstreamLatencyMs
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}
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service.SetOpsLatencyMs(c, service.OpsResponseLatencyMsKey, responseLatencyMs)
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if err == nil && result != nil && result.FirstTokenMs != nil {
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service.SetOpsLatencyMs(c, service.OpsTimeToFirstTokenMsKey, int64(*result.FirstTokenMs))
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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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h.gatewayService.ReportOpenAIAccountScheduleResult(account.ID, false, nil)
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// Pool mode: retry on the same account
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if failoverErr.RetryableOnSameAccount {
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retryLimit := account.GetPoolModeRetryCount()
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if sameAccountRetryCount[account.ID] < retryLimit {
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sameAccountRetryCount[account.ID]++
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reqLog.Warn("openai_chat_completions.pool_mode_same_account_retry",
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zap.Int64("account_id", account.ID),
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zap.Int("upstream_status", failoverErr.StatusCode),
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zap.Int("retry_limit", retryLimit),
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zap.Int("retry_count", sameAccountRetryCount[account.ID]),
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)
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select {
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case <-c.Request.Context().Done():
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return
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case <-time.After(sameAccountRetryDelay):
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}
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continue
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}
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}
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h.gatewayService.RecordOpenAIAccountSwitch()
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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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reqLog.Warn("openai_chat_completions.upstream_failover_switching",
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zap.Int64("account_id", account.ID),
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zap.Int("upstream_status", failoverErr.StatusCode),
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zap.Int("switch_count", switchCount),
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zap.Int("max_switches", maxAccountSwitches),
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)
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continue
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}
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h.gatewayService.ReportOpenAIAccountScheduleResult(account.ID, false, nil)
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wroteFallback := h.ensureForwardErrorResponse(c, streamStarted)
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reqLog.Warn("openai_chat_completions.forward_failed",
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zap.Int64("account_id", account.ID),
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zap.Bool("fallback_error_response_written", wroteFallback),
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zap.Error(err),
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)
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return
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}
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if result != nil {
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h.gatewayService.ReportOpenAIAccountScheduleResult(account.ID, true, result.FirstTokenMs)
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} else {
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h.gatewayService.ReportOpenAIAccountScheduleResult(account.ID, true, nil)
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}
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userAgent := c.GetHeader("User-Agent")
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clientIP := ip.GetClientIP(c)
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h.submitUsageRecordTask(func(ctx context.Context) {
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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: account,
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Subscription: subscription,
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InboundEndpoint: GetInboundEndpoint(c),
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UpstreamEndpoint: GetUpstreamEndpoint(c, account.Platform),
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UserAgent: userAgent,
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IPAddress: clientIP,
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APIKeyService: h.apiKeyService,
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}); err != nil {
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logger.L().With(
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zap.String("component", "handler.openai_gateway.chat_completions"),
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zap.Int64("user_id", subject.UserID),
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zap.Int64("api_key_id", apiKey.ID),
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zap.Any("group_id", apiKey.GroupID),
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zap.String("model", reqModel),
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zap.Int64("account_id", account.ID),
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).Error("openai_chat_completions.record_usage_failed", zap.Error(err))
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}
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})
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reqLog.Debug("openai_chat_completions.request_completed",
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zap.Int64("account_id", account.ID),
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zap.Int("switch_count", switchCount),
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)
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return
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}
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}
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