Upload main.go

main.go

@@ -0,0 +1,1181 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"context"
+	"encoding/json"
+	"flag"
+	"fmt"
+	"io"
+	"log"
+	"math/rand"
+	"net"
+	"net/http"
+	"net/url"
+	"os"
+	"os/signal"
+	"path/filepath"
+	"regexp"
+	"strings"
+	"sync"
+	"syscall"
+	"time"
+
+	"github.com/google/uuid"
+	"github.com/spf13/viper"
+	"golang.org/x/net/proxy"
+)
+
+// ---------------------- 配置结构 ----------------------
+
+type Config struct {
+	ThinkingServices []ThinkingService  `mapstructure:"thinking_services"`
+	Channels         map[string]Channel `mapstructure:"channels"`
+	Global           GlobalConfig       `mapstructure:"global"`
+}
+
+type ThinkingService struct {
+	ID                    int      `mapstructure:"id"`
+	Name                  string   `mapstructure:"name"`
+	Model                 string   `mapstructure:"model"`
+	BaseURL               string   `mapstructure:"base_url"`
+	APIPath               string   `mapstructure:"api_path"`
+	APIKey                string   `mapstructure:"api_key"`
+	Timeout               int      `mapstructure:"timeout"`
+	Retry                 int      `mapstructure:"retry"`
+	Weight                int      `mapstructure:"weight"`
+	Proxy                 string   `mapstructure:"proxy"`
+	Mode                  string   `mapstructure:"mode"` // "standard" 或 "full"
+	ReasoningEffort       string   `mapstructure:"reasoning_effort"`
+	ReasoningFormat       string   `mapstructure:"reasoning_format"`
+	Temperature           *float64 `mapstructure:"temperature"`
+	ForceStopDeepThinking bool     `mapstructure:"force_stop_deep_thinking"` // 配置项：标准模式下遇到 content 时是否立即停止
+}
+
+func (s *ThinkingService) GetFullURL() string {
+	return s.BaseURL + s.APIPath
+}
+
+type Channel struct {
+	Name    string `mapstructure:"name"`
+	BaseURL string `mapstructure:"base_url"`
+	APIPath string `mapstructure:"api_path"`
+	Timeout int    `mapstructure:"timeout"`
+	Proxy   string `mapstructure:"proxy"`
+}
+
+func (c *Channel) GetFullURL() string {
+	return c.BaseURL + c.APIPath
+}
+
+type LogConfig struct {
+	Level    string      `mapstructure:"level"`
+	Format   string      `mapstructure:"format"`
+	Output   string      `mapstructure:"output"`
+	FilePath string      `mapstructure:"file_path"`
+	Debug    DebugConfig `mapstructure:"debug"`
+}
+
+type DebugConfig struct {
+	Enabled          bool `mapstructure:"enabled"`
+	PrintRequest     bool `mapstructure:"print_request"`
+	PrintResponse    bool `mapstructure:"print_response"`
+	MaxContentLength int  `mapstructure:"max_content_length"`
+}
+
+type ProxyConfig struct {
+	Enabled       bool   `mapstructure:"enabled"`
+	Default       string `mapstructure:"default"`
+	AllowInsecure bool   `mapstructure:"allow_insecure"`
+}
+
+type GlobalConfig struct {
+	MaxRetries     int            `mapstructure:"max_retries"`
+	DefaultTimeout int            `mapstructure:"default_timeout"`
+	ErrorCodes     struct {
+		RetryOn []int `mapstructure:"retry_on"`
+	} `mapstructure:"error_codes"`
+	Log         LogConfig      `mapstructure:"log"`
+	Server      ServerConfig   `mapstructure:"server"`
+	Proxy       ProxyConfig    `mapstructure:"proxy"`
+	ConfigPaths []string       `mapstructure:"config_paths"`
+	Thinking    ThinkingConfig `mapstructure:"thinking"`
+}
+
+type ServerConfig struct {
+	Port         int    `mapstructure:"port"`
+	Host         string `mapstructure:"host"`
+	ReadTimeout  int    `mapstructure:"read_timeout"`
+	WriteTimeout int    `mapstructure:"write_timeout"`
+	IdleTimeout  int    `mapstructure:"idle_timeout"`
+}
+
+type ThinkingConfig struct {
+	Enabled          bool `mapstructure:"enabled"`
+	AddToAllRequests bool `mapstructure:"add_to_all_requests"`
+	Timeout          int  `mapstructure:"timeout"`
+}
+
+// ---------------------- API 相关结构 ----------------------
+
+type ChatCompletionRequest struct {
+	Model       string                  `json:"model"`
+	Messages    []ChatCompletionMessage `json:"messages"`
+	Temperature float64                 `json:"temperature,omitempty"`
+	MaxTokens   int                     `json:"max_tokens,omitempty"`
+	Stream      bool                    `json:"stream,omitempty"`
+	APIKey      string                  `json:"-"` // 内部传递，不序列化
+}
+
+type ChatCompletionMessage struct {
+	Role             string      `json:"role"`
+	Content          string      `json:"content"`
+	ReasoningContent interface{} `json:"reasoning_content,omitempty"`
+}
+
+type ChatCompletionResponse struct {
+	ID      string   `json:"id"`
+	Object  string   `json:"object"`
+	Created int64    `json:"created"`
+	Model   string   `json:"model"`
+	Choices []Choice `json:"choices"`
+	Usage   Usage    `json:"usage"`
+}
+
+type Choice struct {
+	Index        int                   `json:"index"`
+	Message      ChatCompletionMessage `json:"message"`
+	FinishReason string                `json:"finish_reason"`
+}
+
+type Usage struct {
+	PromptTokens     int `json:"prompt_tokens"`
+	CompletionTokens int `json:"completion_tokens"`
+	TotalTokens      int `json:"total_tokens"`
+}
+
+// ---------------------- 日志工具 ----------------------
+
+type RequestLogger struct {
+	RequestID string
+	Model     string
+	StartTime time.Time
+	logs      []string
+	config    *Config
+}
+
+func NewRequestLogger(config *Config) *RequestLogger {
+	return &RequestLogger{
+		RequestID: uuid.New().String(),
+		StartTime: time.Now(),
+		logs:      make([]string, 0),
+		config:    config,
+	}
+}
+
+// 新增函数：替换环境变量
+func replaceEnvVars(value string) string {
+    // 检查是否包含环境变量占位符 ${...}
+    if !strings.Contains(value, "${") {
+        return value
+    }
+
+    // 查找所有 ${...} 格式的环境变量并替换
+    result := value
+    for {
+        start := strings.Index(result, "${")
+        if start == -1 {
+            break
+        }
+        
+        end := strings.Index(result[start:], "}")
+        if end == -1 {
+            break
+        }
+        end += start
+        
+        // 提取环境变量名称
+        envName := result[start+2:end]
+        
+        // 获取环境变量值，如果不存在则保持原样
+        envValue := os.Getenv(envName)
+        if envValue == "" {
+            // 可选：记录警告或使用默认值
+            // 这里我们保持原样，也可以设置为空字符串或其他默认值
+        }
+        
+        // 替换环境变量
+        result = result[:start] + envValue + result[end+1:]
+    }
+    
+    return result
+}
+
+// 处理配置结构体中的环境变量
+func ProcessConfig(config *Config) {
+    // 处理 ThinkingServices
+    for i := range config.ThinkingServices {
+        config.ThinkingServices[i].Name = replaceEnvVars(config.ThinkingServices[i].Name)
+        config.ThinkingServices[i].Model = replaceEnvVars(config.ThinkingServices[i].Model)
+        config.ThinkingServices[i].BaseURL = replaceEnvVars(config.ThinkingServices[i].BaseURL)
+        config.ThinkingServices[i].APIKey = replaceEnvVars(config.ThinkingServices[i].APIKey)
+        config.ThinkingServices[i].Proxy = replaceEnvVars(config.ThinkingServices[i].Proxy)
+    }
+    
+    // 处理 Channels
+    for key, channel := range config.Channels {
+        channel.Name = replaceEnvVars(channel.Name)
+        channel.BaseURL = replaceEnvVars(channel.BaseURL)
+        channel.Proxy = replaceEnvVars(channel.Proxy)
+        config.Channels[key] = channel
+    }
+    
+    // 如果 Global 配置中也有环境变量，可以在这里添加处理逻辑
+}
+
+func (l *RequestLogger) Log(format string, args ...interface{}) {
+	msg := fmt.Sprintf(format, args...)
+	l.logs = append(l.logs, fmt.Sprintf("[%s] %s", time.Now().Format(time.RFC3339), msg))
+	log.Printf("[RequestID: %s] %s", l.RequestID, msg)
+}
+
+func (l *RequestLogger) LogContent(contentType string, content interface{}, maxLength int) {
+	if !l.config.Global.Log.Debug.Enabled {
+		return
+	}
+	sanitizedContent := sanitizeJSON(content)
+	truncatedContent := truncateContent(sanitizedContent, maxLength)
+	l.Log("%s Content:\n%s", contentType, truncatedContent)
+}
+
+func truncateContent(content string, maxLength int) string {
+	if len(content) <= maxLength {
+		return content
+	}
+	return content[:maxLength] + "... (truncated)"
+}
+
+func sanitizeJSON(data interface{}) string {
+	sanitized, err := json.Marshal(data)
+	if err != nil {
+		return "Failed to marshal JSON"
+	}
+	content := string(sanitized)
+	sensitivePattern := `"api_key":\s*"[^"]*"`
+	content = regexp.MustCompile(sensitivePattern).ReplaceAllString(content, `"api_key":"****"`)
+	return content
+}
+
+func extractRealAPIKey(fullKey string) string {
+	parts := strings.Split(fullKey, "-")
+	if len(parts) >= 3 && (parts[0] == "deep" || parts[0] == "openai") {
+		return strings.Join(parts[2:], "-")
+	}
+	return fullKey
+}
+
+func extractChannelID(fullKey string) string {
+	parts := strings.Split(fullKey, "-")
+	if len(parts) >= 2 && (parts[0] == "deep" || parts[0] == "openai") {
+		return parts[1]
+	}
+	return "1" // 默认渠道
+}
+
+func logAPIKey(key string) string {
+	if len(key) <= 8 {
+		return "****"
+	}
+	return key[:4] + "..." + key[len(key)-4:]
+}
+
+// ---------------------- Server 结构 ----------------------
+
+type Server struct {
+	config *Config
+	srv    *http.Server
+}
+
+var (
+	randMu  sync.Mutex
+	randGen = rand.New(rand.NewSource(time.Now().UnixNano()))
+)
+
+func NewServer(config *Config) *Server {
+	return &Server{
+		config: config,
+	}
+}
+
+func (s *Server) Start() error {
+	mux := http.NewServeMux()
+	mux.HandleFunc("/v1/chat/completions", s.handleOpenAIRequests)
+	mux.HandleFunc("/v1/models", s.handleOpenAIRequests)
+	mux.HandleFunc("/health", s.handleHealth)
+
+	s.srv = &http.Server{
+		Addr:         fmt.Sprintf("%s:%d", s.config.Global.Server.Host, s.config.Global.Server.Port),
+		Handler:      mux,
+		ReadTimeout:  time.Duration(s.config.Global.Server.ReadTimeout) * time.Second,
+		WriteTimeout: time.Duration(s.config.Global.Server.WriteTimeout) * time.Second,
+		IdleTimeout:  time.Duration(s.config.Global.Server.IdleTimeout) * time.Second,
+	}
+
+	log.Printf("Server starting on %s\n", s.srv.Addr)
+	return s.srv.ListenAndServe()
+}
+
+func (s *Server) Shutdown(ctx context.Context) error {
+	return s.srv.Shutdown(ctx)
+}
+
+func (s *Server) handleHealth(w http.ResponseWriter, r *http.Request) {
+	w.WriteHeader(http.StatusOK)
+	json.NewEncoder(w).Encode(map[string]string{"status": "healthy"})
+}
+
+func (s *Server) handleOpenAIRequests(w http.ResponseWriter, r *http.Request) {
+	logger := NewRequestLogger(s.config)
+
+	fullAPIKey := strings.TrimPrefix(r.Header.Get("Authorization"), "Bearer ")
+	apiKey := extractRealAPIKey(fullAPIKey)
+	channelID := extractChannelID(fullAPIKey)
+
+	logger.Log("Received request for %s with API Key: %s", r.URL.Path, logAPIKey(fullAPIKey))
+	logger.Log("Extracted channel ID: %s", channelID)
+	logger.Log("Extracted real API Key: %s", logAPIKey(apiKey))
+
+	targetChannel, ok := s.config.Channels[channelID]
+	if !ok {
+		http.Error(w, "Invalid channel", http.StatusBadRequest)
+		return
+	}
+
+	if r.URL.Path == "/v1/models" {
+		if r.Method != http.MethodGet {
+			http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+			return
+		}
+		req := &ChatCompletionRequest{APIKey: apiKey}
+		s.forwardModelsRequest(w, r.Context(), req, targetChannel)
+		return
+	}
+
+	if r.Method != http.MethodPost {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	body, err := io.ReadAll(r.Body)
+	if err != nil {
+		logger.Log("Error reading request body: %v", err)
+		http.Error(w, "Failed to read request", http.StatusBadRequest)
+		return
+	}
+	r.Body.Close()
+	r.Body = io.NopCloser(bytes.NewBuffer(body))
+
+	if s.config.Global.Log.Debug.PrintRequest {
+		logger.LogContent("Request", string(body), s.config.Global.Log.Debug.MaxContentLength)
+	}
+
+	var req ChatCompletionRequest
+	if err := json.NewDecoder(bytes.NewBuffer(body)).Decode(&req); err != nil {
+		http.Error(w, "Invalid request body", http.StatusBadRequest)
+		return
+	}
+	req.APIKey = apiKey
+
+	thinkingService := s.getWeightedRandomThinkingService()
+	logger.Log("Using thinking service: %s with API Key: %s", thinkingService.Name, logAPIKey(thinkingService.APIKey))
+
+	if req.Stream {
+		handler, err := NewStreamHandler(w, thinkingService, targetChannel, s.config)
+		if err != nil {
+			http.Error(w, "Streaming not supported", http.StatusInternalServerError)
+			return
+		}
+		if err := handler.HandleRequest(r.Context(), &req); err != nil {
+			logger.Log("Stream handler error: %v", err)
+		}
+	} else {
+		thinkingResp, err := s.processThinkingContent(r.Context(), &req, thinkingService)
+		if err != nil {
+			logger.Log("Error processing thinking content: %v", err)
+			http.Error(w, "Thinking service error: "+err.Error(), http.StatusInternalServerError)
+			return
+		}
+		enhancedReq := s.prepareEnhancedRequest(&req, thinkingResp, thinkingService)
+		s.forwardRequest(w, r.Context(), enhancedReq, targetChannel)
+	}
+}
+
+func (s *Server) getWeightedRandomThinkingService() ThinkingService {
+	thinkingServices := s.config.ThinkingServices
+	if len(thinkingServices) == 0 {
+		return ThinkingService{}
+	}
+	totalWeight := 0
+	for _, svc := range thinkingServices {
+		totalWeight += svc.Weight
+	}
+	if totalWeight <= 0 {
+		log.Println("Warning: Total weight of thinking services is not positive, using first service as default.")
+		return thinkingServices[0]
+	}
+	randMu.Lock()
+	randNum := randGen.Intn(totalWeight)
+	randMu.Unlock()
+	currentSum := 0
+	for _, svc := range thinkingServices {
+		currentSum += svc.Weight
+		if randNum < currentSum {
+			return svc
+		}
+	}
+	return thinkingServices[0]
+}
+
+// ---------------------- 非流式处理思考服务 ----------------------
+
+type ThinkingResponse struct {
+	Content          string
+	ReasoningContent string
+}
+
+func (s *Server) processThinkingContent(ctx context.Context, req *ChatCompletionRequest, svc ThinkingService) (*ThinkingResponse, error) {
+	logger := NewRequestLogger(s.config)
+	log.Printf("Getting thinking content from service: %s (mode=%s)", svc.Name, svc.Mode)
+
+	thinkingReq := *req
+	thinkingReq.Model = svc.Model
+	thinkingReq.APIKey = svc.APIKey
+
+	var systemPrompt string
+	if svc.Mode == "full" {
+		systemPrompt = "Provide a detailed step-by-step analysis of the question. Your entire response will be used as reasoning and won't be shown to the user directly."
+	} else {
+		systemPrompt = "Please provide a detailed reasoning process for your response. Think step by step."
+	}
+	thinkingReq.Messages = append([]ChatCompletionMessage{
+		{Role: "system", Content: systemPrompt},
+	}, thinkingReq.Messages...)
+
+	temp := 0.7
+	if svc.Temperature != nil {
+		temp = *svc.Temperature
+	}
+	payload := map[string]interface{}{
+		"model":       svc.Model,
+		"messages":    thinkingReq.Messages,
+		"stream":      false,
+		"temperature": temp,
+	}
+	if isValidReasoningEffort(svc.ReasoningEffort) {
+		payload["reasoning_effort"] = svc.ReasoningEffort
+	}
+	if isValidReasoningFormat(svc.ReasoningFormat) {
+		payload["reasoning_format"] = svc.ReasoningFormat
+	}
+
+	if s.config.Global.Log.Debug.PrintRequest {
+		logger.LogContent("Thinking Service Request", payload, s.config.Global.Log.Debug.MaxContentLength)
+	}
+
+	jsonData, err := json.Marshal(payload)
+	if err != nil {
+		return nil, fmt.Errorf("failed to marshal thinking request: %v", err)
+	}
+	client, err := createHTTPClient(svc.Proxy, time.Duration(svc.Timeout)*time.Second)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create HTTP client: %v", err)
+	}
+	httpReq, err := http.NewRequestWithContext(ctx, http.MethodPost, svc.GetFullURL(), bytes.NewBuffer(jsonData))
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %v", err)
+	}
+	httpReq.Header.Set("Content-Type", "application/json")
+	httpReq.Header.Set("Authorization", "Bearer "+svc.APIKey)
+
+	resp, err := client.Do(httpReq)
+	if err != nil {
+		return nil, fmt.Errorf("failed to send thinking request: %v", err)
+	}
+	defer resp.Body.Close()
+
+	respBody, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read response body: %v", err)
+	}
+	if s.config.Global.Log.Debug.PrintResponse {
+		logger.LogContent("Thinking Service Response", string(respBody), s.config.Global.Log.Debug.MaxContentLength)
+	}
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("thinking service returned %d: %s", resp.StatusCode, string(respBody))
+	}
+
+	var thinkingResp ChatCompletionResponse
+	if err := json.Unmarshal(respBody, &thinkingResp); err != nil {
+		return nil, fmt.Errorf("failed to unmarshal thinking response: %v", err)
+	}
+	if len(thinkingResp.Choices) == 0 {
+		return nil, fmt.Errorf("thinking service returned no choices")
+	}
+
+	result := &ThinkingResponse{}
+	choice := thinkingResp.Choices[0]
+
+	if svc.Mode == "full" {
+		result.ReasoningContent = choice.Message.Content
+		result.Content = "Based on the above detailed analysis."
+	} else {
+		if choice.Message.ReasoningContent != nil {
+			switch v := choice.Message.ReasoningContent.(type) {
+			case string:
+				result.ReasoningContent = v
+			case map[string]interface{}:
+				if j, err := json.Marshal(v); err == nil {
+					result.ReasoningContent = string(j)
+				}
+			}
+		}
+		if result.ReasoningContent == "" {
+			result.ReasoningContent = choice.Message.Content
+		}
+		result.Content = "Based on the above reasoning."
+	}
+	return result, nil
+}
+
+func (s *Server) prepareEnhancedRequest(originalReq *ChatCompletionRequest, thinkingResp *ThinkingResponse, svc ThinkingService) *ChatCompletionRequest {
+	newReq := *originalReq
+	var systemPrompt string
+	if svc.Mode == "full" {
+		systemPrompt = fmt.Sprintf(`Consider the following detailed analysis (not shown to user):
+%s
+
+Provide a clear, concise response that incorporates insights from this analysis.`, thinkingResp.ReasoningContent)
+	} else {
+		systemPrompt = fmt.Sprintf(`Previous thinking process:
+%s
+Please consider the above thinking process in your response.`, thinkingResp.ReasoningContent)
+	}
+	newReq.Messages = append([]ChatCompletionMessage{
+		{Role: "system", Content: systemPrompt},
+	}, newReq.Messages...)
+	return &newReq
+}
+
+func (s *Server) forwardRequest(w http.ResponseWriter, ctx context.Context, req *ChatCompletionRequest, channel Channel) {
+	logger := NewRequestLogger(s.config)
+	if s.config.Global.Log.Debug.PrintRequest {
+		logger.LogContent("Forward Request", req, s.config.Global.Log.Debug.MaxContentLength)
+	}
+	jsonData, err := json.Marshal(req)
+	if err != nil {
+		http.Error(w, "Failed to marshal request", http.StatusInternalServerError)
+		return
+	}
+
+	client, err := createHTTPClient(channel.Proxy, time.Duration(channel.Timeout)*time.Second)
+	if err != nil {
+		http.Error(w, fmt.Sprintf("Failed to create HTTP client: %v", err), http.StatusInternalServerError)
+		return
+	}
+
+	httpReq, err := http.NewRequestWithContext(ctx, http.MethodPost, channel.GetFullURL(), bytes.NewBuffer(jsonData))
+	if err != nil {
+		http.Error(w, "Failed to create request", http.StatusInternalServerError)
+		return
+	}
+	httpReq.Header.Set("Content-Type", "application/json")
+	httpReq.Header.Set("Authorization", "Bearer "+req.APIKey)
+
+	resp, err := client.Do(httpReq)
+	if err != nil {
+		http.Error(w, fmt.Sprintf("Failed to forward request: %v", err), http.StatusInternalServerError)
+		return
+	}
+	defer resp.Body.Close()
+
+	respBody, err := io.ReadAll(resp.Body)
+	if err != nil {
+		http.Error(w, "Failed to read response", http.StatusInternalServerError)
+		return
+	}
+	if s.config.Global.Log.Debug.PrintResponse {
+		logger.LogContent("Forward Response", string(respBody), s.config.Global.Log.Debug.MaxContentLength)
+	}
+	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
+		http.Error(w, fmt.Sprintf("Target server error: %s", resp.Status), resp.StatusCode)
+		return
+	}
+
+	for k, vals := range resp.Header {
+		for _, v := range vals {
+			w.Header().Add(k, v)
+		}
+	}
+	w.WriteHeader(resp.StatusCode)
+	w.Write(respBody)
+}
+
+func (s *Server) forwardModelsRequest(w http.ResponseWriter, ctx context.Context, req *ChatCompletionRequest, targetChannel Channel) {
+	logger := NewRequestLogger(s.config)
+	if s.config.Global.Log.Debug.PrintRequest {
+		logger.LogContent("/v1/models Request", req, s.config.Global.Log.Debug.MaxContentLength)
+	}
+	fullChatURL := targetChannel.GetFullURL()
+	parsedURL, err := url.Parse(fullChatURL)
+	if err != nil {
+		http.Error(w, "Failed to parse channel URL", http.StatusInternalServerError)
+		return
+	}
+	baseURL := parsedURL.Scheme + "://" + parsedURL.Host
+	modelsURL := strings.TrimSuffix(baseURL, "/") + "/v1/models"
+
+	client, err := createHTTPClient(targetChannel.Proxy, time.Duration(targetChannel.Timeout)*time.Second)
+	if err != nil {
+		http.Error(w, fmt.Sprintf("Failed to create HTTP client: %v", err), http.StatusInternalServerError)
+		return
+	}
+
+	httpReq, err := http.NewRequestWithContext(ctx, http.MethodGet, modelsURL, nil)
+	if err != nil {
+		http.Error(w, "Failed to create request", http.StatusInternalServerError)
+		return
+	}
+	httpReq.Header.Set("Authorization", "Bearer "+req.APIKey)
+
+	resp, err := client.Do(httpReq)
+	if err != nil {
+		http.Error(w, fmt.Sprintf("Failed to forward request: %v", err), http.StatusInternalServerError)
+		return
+	}
+	defer resp.Body.Close()
+
+	respBody, err := io.ReadAll(resp.Body)
+	if err != nil {
+		http.Error(w, "Failed to read response", http.StatusInternalServerError)
+		return
+	}
+	if s.config.Global.Log.Debug.PrintResponse {
+		logger.LogContent("/v1/models Response", string(respBody), s.config.Global.Log.Debug.MaxContentLength)
+	}
+	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
+		http.Error(w, fmt.Sprintf("Target server error: %s", resp.Status), resp.StatusCode)
+		return
+	}
+
+	for k, vals := range resp.Header {
+		for _, v := range vals {
+			w.Header().Add(k, v)
+		}
+	}
+	w.WriteHeader(resp.StatusCode)
+	w.Write(respBody)
+}
+
+// ---------------------- 流式处理 ----------------------
+
+// collectedReasoningBuffer 用于收集思考服务返回的 reasoning_content（标准模式只收集 reasoning_content；full 模式收集全部）
+type collectedReasoningBuffer struct {
+	builder strings.Builder
+	mode    string
+}
+
+func (cb *collectedReasoningBuffer) append(text string) {
+	cb.builder.WriteString(text)
+}
+
+func (cb *collectedReasoningBuffer) get() string {
+	return cb.builder.String()
+}
+
+type StreamHandler struct {
+	thinkingService ThinkingService
+	targetChannel   Channel
+	writer          http.ResponseWriter
+	flusher         http.Flusher
+	config          *Config
+}
+
+func NewStreamHandler(w http.ResponseWriter, thinkingService ThinkingService, targetChannel Channel, config *Config) (*StreamHandler, error) {
+	flusher, ok := w.(http.Flusher)
+	if !ok {
+		return nil, fmt.Errorf("streaming not supported by this writer")
+	}
+	return &StreamHandler{
+		thinkingService: thinkingService,
+		targetChannel:   targetChannel,
+		writer:          w,
+		flusher:         flusher,
+		config:          config,
+	}, nil
+}
+
+// HandleRequest 分两阶段：先流式接收思考服务 SSE 并转发给客户端（只转发包含 reasoning_content 的 chunk，标准模式遇到纯 content 则中断）；
+// 然后使用收集到的 reasoning_content 构造最终请求，发起目标 Channel 的 SSE 并转发给客户端。
+func (h *StreamHandler) HandleRequest(ctx context.Context, req *ChatCompletionRequest) error {
+	h.writer.Header().Set("Content-Type", "text/event-stream")
+	h.writer.Header().Set("Cache-Control", "no-cache")
+	h.writer.Header().Set("Connection", "keep-alive")
+
+	logger := NewRequestLogger(h.config)
+	reasonBuf := &collectedReasoningBuffer{mode: h.thinkingService.Mode}
+
+	// 阶段一：流式接收思考服务 SSE
+	if err := h.streamThinkingService(ctx, req, reasonBuf, logger); err != nil {
+		return err
+	}
+
+	// 阶段二：构造最终请求，并流式转发目标 Channel SSE
+	finalReq := h.prepareFinalRequest(req, reasonBuf.get())
+	if err := h.streamFinalChannel(ctx, finalReq, logger); err != nil {
+		return err
+	}
+	return nil
+}
+
+// streamThinkingService 连接思考服务 SSE，原样转发包含 reasoning_content 的 SSE chunk给客户端，同时收集 reasoning_content。
+// 在标准模式下，一旦遇到只返回 non-empty 的 content（且 reasoning_content 为空），则立即中断，不转发该 chunk。
+func (h *StreamHandler) streamThinkingService(ctx context.Context, req *ChatCompletionRequest, reasonBuf *collectedReasoningBuffer, logger *RequestLogger) error {
+	thinkingReq := *req
+	thinkingReq.Model = h.thinkingService.Model
+	thinkingReq.APIKey = h.thinkingService.APIKey
+
+	var systemPrompt string
+	if h.thinkingService.Mode == "full" {
+		systemPrompt = "Provide a detailed step-by-step analysis of the question. Your entire response will be used as reasoning and won't be shown to the user directly."
+	} else {
+		systemPrompt = "Please provide a detailed reasoning process for your response. Think step by step."
+	}
+	messages := append([]ChatCompletionMessage{
+		{Role: "system", Content: systemPrompt},
+	}, thinkingReq.Messages...)
+
+	temp := 0.7
+	if h.thinkingService.Temperature != nil {
+		temp = *h.thinkingService.Temperature
+	}
+	bodyMap := map[string]interface{}{
+		"model":       thinkingReq.Model,
+		"messages":    messages,
+		"temperature": temp,
+		"stream":      true,
+	}
+	if isValidReasoningEffort(h.thinkingService.ReasoningEffort) {
+		bodyMap["reasoning_effort"] = h.thinkingService.ReasoningEffort
+	}
+	if isValidReasoningFormat(h.thinkingService.ReasoningFormat) {
+		bodyMap["reasoning_format"] = h.thinkingService.ReasoningFormat
+	}
+
+	jsonData, err := json.Marshal(bodyMap)
+	if err != nil {
+		return err
+	}
+
+	client, err := createHTTPClient(h.thinkingService.Proxy, time.Duration(h.thinkingService.Timeout)*time.Second)
+	if err != nil {
+		return err
+	}
+
+	httpReq, err := http.NewRequestWithContext(ctx, http.MethodPost, h.thinkingService.GetFullURL(), bytes.NewBuffer(jsonData))
+	if err != nil {
+		return err
+	}
+	httpReq.Header.Set("Content-Type", "application/json")
+	httpReq.Header.Set("Authorization", "Bearer "+h.thinkingService.APIKey)
+
+	log.Printf("Starting ThinkingService SSE => %s (mode=%s, force_stop=%v)", h.thinkingService.GetFullURL(), h.thinkingService.Mode, h.thinkingService.ForceStopDeepThinking)
+	resp, err := client.Do(httpReq)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		b, _ := io.ReadAll(resp.Body)
+		return fmt.Errorf("thinking service status=%d, body=%s", resp.StatusCode, string(b))
+	}
+
+	reader := bufio.NewReader(resp.Body)
+	var lastLine string
+	// 标识是否需中断思考 SSE（标准模式下）
+	forceStop := false
+
+	for {
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		default:
+		}
+		line, err := reader.ReadString('\n')
+		if err != nil {
+			if err == io.EOF {
+				break
+			}
+			return err
+		}
+		line = strings.TrimSpace(line)
+		if line == "" || line == lastLine {
+			continue
+		}
+		lastLine = line
+
+		if !strings.HasPrefix(line, "data: ") {
+			continue
+		}
+		dataPart := strings.TrimPrefix(line, "data: ")
+		if dataPart == "[DONE]" {
+			// 思考服务结束：直接中断（不发送特殊标记）
+			break
+		}
+
+		var chunk struct {
+			Choices []struct {
+				Delta struct {
+					Content          string `json:"content,omitempty"`
+					ReasoningContent string `json:"reasoning_content,omitempty"`
+				} `json:"delta"`
+				FinishReason *string `json:"finish_reason,omitempty"`
+			} `json:"choices"`
+		}
+		if err := json.Unmarshal([]byte(dataPart), &chunk); err != nil {
+			// 如果解析失败，直接原样转发
+			h.writer.Write([]byte("data: " + dataPart + "\n\n"))
+			h.flusher.Flush()
+			continue
+		}
+
+		if len(chunk.Choices) > 0 {
+			c := chunk.Choices[0]
+			if h.config.Global.Log.Debug.PrintResponse {
+				logger.LogContent("Thinking SSE chunk", chunk, h.config.Global.Log.Debug.MaxContentLength)
+			}
+
+			if h.thinkingService.Mode == "full" {
+				// full 模式：收集所有内容
+				if c.Delta.ReasoningContent != "" {
+					reasonBuf.append(c.Delta.ReasoningContent)
+				}
+				if c.Delta.Content != "" {
+					reasonBuf.append(c.Delta.Content)
+				}
+				// 原样转发整 chunk
+				forwardLine := "data: " + dataPart + "\n\n"
+				h.writer.Write([]byte(forwardLine))
+				h.flusher.Flush()
+			} else {
+				// standard 模式：只收集 reasoning_content
+				if c.Delta.ReasoningContent != "" {
+					reasonBuf.append(c.Delta.ReasoningContent)
+					// 转发该 chunk
+					forwardLine := "data: " + dataPart + "\n\n"
+					h.writer.Write([]byte(forwardLine))
+					h.flusher.Flush()
+				}
+				// 如果遇到 chunk 中只有 content（且 reasoning_content 为空），认为思考链结束，不转发该 chunk
+				if c.Delta.Content != "" && strings.TrimSpace(c.Delta.ReasoningContent) == "" {
+					forceStop = true
+				}
+			}
+
+			// 如果 finishReason 非空，也认为结束
+			if c.FinishReason != nil && *c.FinishReason != "" {
+				forceStop = true
+			}
+		}
+
+		if forceStop {
+			break
+		}
+	}
+	// 读空剩余数据
+	io.Copy(io.Discard, reader)
+	return nil
+}
+
+func (h *StreamHandler) prepareFinalRequest(originalReq *ChatCompletionRequest, reasoningCollected string) *ChatCompletionRequest {
+	req := *originalReq
+	var systemPrompt string
+	if h.thinkingService.Mode == "full" {
+		systemPrompt = fmt.Sprintf(
+			`Consider the following detailed analysis (not shown to user):
+%s
+
+Provide a clear, concise response that incorporates insights from this analysis.`,
+			reasoningCollected,
+		)
+	} else {
+		systemPrompt = fmt.Sprintf(
+			`Previous thinking process:
+%s
+Please consider the above thinking process in your response.`,
+			reasoningCollected,
+		)
+	}
+	req.Messages = append([]ChatCompletionMessage{
+		{Role: "system", Content: systemPrompt},
+	}, req.Messages...)
+	return &req
+}
+
+func (h *StreamHandler) streamFinalChannel(ctx context.Context, req *ChatCompletionRequest, logger *RequestLogger) error {
+	if h.config.Global.Log.Debug.PrintRequest {
+		logger.LogContent("Final Request to Channel", req, h.config.Global.Log.Debug.MaxContentLength)
+	}
+
+	jsonData, err := json.Marshal(req)
+	if err != nil {
+		return err
+	}
+	client, err := createHTTPClient(h.targetChannel.Proxy, time.Duration(h.targetChannel.Timeout)*time.Second)
+	if err != nil {
+		return err
+	}
+	httpReq, err := http.NewRequestWithContext(ctx, http.MethodPost, h.targetChannel.GetFullURL(), bytes.NewBuffer(jsonData))
+	if err != nil {
+		return err
+	}
+	httpReq.Header.Set("Content-Type", "application/json")
+	httpReq.Header.Set("Authorization", "Bearer "+req.APIKey)
+
+	resp, err := client.Do(httpReq)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		b, _ := io.ReadAll(resp.Body)
+		return fmt.Errorf("target channel status=%d, body=%s", resp.StatusCode, string(b))
+	}
+
+	reader := bufio.NewReader(resp.Body)
+	var lastLine string
+
+	for {
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		default:
+		}
+		line, err := reader.ReadString('\n')
+		if err != nil {
+			if err == io.EOF {
+				break
+			}
+			return err
+		}
+		line = strings.TrimSpace(line)
+		if line == "" || line == lastLine {
+			continue
+		}
+		lastLine = line
+
+		if !strings.HasPrefix(line, "data: ") {
+			continue
+		}
+		data := strings.TrimPrefix(line, "data: ")
+		if data == "[DONE]" {
+			doneLine := "data: [DONE]\n\n"
+			h.writer.Write([]byte(doneLine))
+			h.flusher.Flush()
+			break
+		}
+		forwardLine := "data: " + data + "\n\n"
+		h.writer.Write([]byte(forwardLine))
+		h.flusher.Flush()
+
+		if h.config.Global.Log.Debug.PrintResponse {
+			logger.LogContent("Channel SSE chunk", forwardLine, h.config.Global.Log.Debug.MaxContentLength)
+		}
+	}
+	io.Copy(io.Discard, reader)
+	return nil
+}
+
+// ---------------------- HTTP Client 工具 ----------------------
+
+func createHTTPClient(proxyURL string, timeout time.Duration) (*http.Client, error) {
+	transport := &http.Transport{
+		DialContext: (&net.Dialer{
+			Timeout:   30 * time.Second,
+			KeepAlive: 30 * time.Second,
+		}).DialContext,
+		ForceAttemptHTTP2:     true,
+		MaxIdleConns:          100,
+		IdleConnTimeout:       90 * time.Second,
+		TLSHandshakeTimeout:   10 * time.Second,
+		ExpectContinueTimeout: 1 * time.Second,
+	}
+	if proxyURL != "" {
+		parsedURL, err := url.Parse(proxyURL)
+		if err != nil {
+			return nil, fmt.Errorf("invalid proxy URL: %v", err)
+		}
+		switch parsedURL.Scheme {
+		case "http", "https":
+			transport.Proxy = http.ProxyURL(parsedURL)
+		case "socks5":
+			dialer, err := proxy.FromURL(parsedURL, proxy.Direct)
+			if err != nil {
+				return nil, fmt.Errorf("failed to create SOCKS5 dialer: %v", err)
+			}
+			transport.DialContext = func(ctx context.Context, network, addr string) (net.Conn, error) {
+				return dialer.Dial(network, addr)
+			}
+		default:
+			return nil, fmt.Errorf("unsupported proxy scheme: %s", parsedURL.Scheme)
+		}
+	}
+	return &http.Client{
+		Transport: transport,
+		Timeout:   timeout,
+	}, nil
+}
+
+func maskSensitiveHeaders(headers http.Header) http.Header {
+	masked := make(http.Header)
+	for k, vals := range headers {
+		if strings.ToLower(k) == "authorization" {
+			masked[k] = []string{"Bearer ****"}
+		} else {
+			masked[k] = vals
+		}
+	}
+	return masked
+}
+
+func isValidReasoningEffort(effort string) bool {
+	switch strings.ToLower(effort) {
+	case "low", "medium", "high":
+		return true
+	}
+	return false
+}
+
+func isValidReasoningFormat(format string) bool {
+	switch strings.ToLower(format) {
+	case "parsed", "raw", "hidden":
+		return true
+	}
+	return false
+}
+
+// ---------------------- 配置加载与验证 ----------------------
+
+func loadConfig() (*Config, error) {
+	var configFile string
+	flag.StringVar(&configFile, "config", "", "path to config file")
+	flag.Parse()
+	viper.SetConfigType("yaml")
+
+	if configFile != "" {
+		viper.SetConfigFile(configFile)
+	} else {
+		ex, err := os.Executable()
+		if err != nil {
+			return nil, err
+		}
+		exePath := filepath.Dir(ex)
+		defaultPaths := []string{
+			filepath.Join(exePath, "config.yaml"),
+			filepath.Join(exePath, "conf", "config.yaml"),
+			"./config.yaml",
+			"./conf/config.yaml",
+		}
+		if os.PathSeparator == '\\' {
+			programData := os.Getenv("PROGRAMDATA")
+			if programData != "" {
+				defaultPaths = append(defaultPaths, filepath.Join(programData, "DeepAI", "config.yaml"))
+			}
+		} else {
+			defaultPaths = append(defaultPaths, "/etc/deepai/config.yaml")
+		}
+		for _, p := range defaultPaths {
+			viper.AddConfigPath(filepath.Dir(p))
+			if strings.Contains(p, ".yaml") {
+				viper.SetConfigName(strings.TrimSuffix(filepath.Base(p), ".yaml"))
+			}
+		}
+	}
+
+	if err := viper.ReadInConfig(); err != nil {
+		return nil, fmt.Errorf("failed to read config: %v", err)
+	}
+
+	var cfg Config
+	if err := viper.Unmarshal(&cfg); err != nil {
+		return nil, fmt.Errorf("unmarshal config error: %v", err)
+	}
+	if err := validateConfig(&cfg); err != nil {
+		return nil, fmt.Errorf("config validation error: %v", err)
+	}
+	return &cfg, nil
+}
+
+func validateConfig(config *Config) error {
+	if len(config.ThinkingServices) == 0 {
+		return fmt.Errorf("no thinking services configured")
+	}
+	if len(config.Channels) == 0 {
+		return fmt.Errorf("no channels configured")
+	}
+	for i, svc := range config.ThinkingServices {
+		if svc.BaseURL == "" {
+			return fmt.Errorf("thinking service %s has empty baseURL", svc.Name)
+		}
+		if svc.APIKey == "" {
+			return fmt.Errorf("thinking service %s has empty apiKey", svc.Name)
+		}
+		if svc.Timeout <= 0 {
+			return fmt.Errorf("thinking service %s has invalid timeout", svc.Name)
+		}
+		if svc.Model == "" {
+			return fmt.Errorf("thinking service %s has empty model", svc.Name)
+		}
+		if svc.Mode == "" {
+			config.ThinkingServices[i].Mode = "standard"
+		} else if svc.Mode != "standard" && svc.Mode != "full" {
+			return fmt.Errorf("thinking service %s unknown mode=%s", svc.Name, svc.Mode)
+		}
+	}
+	return nil
+}
+
+func main() {
+	log.SetFlags(log.Ldate | log.Ltime | log.Lmicroseconds | log.Lshortfile)
+
+	cfg, err := loadConfig()
+	if err != nil {
+		log.Fatalf("Failed to load config: %v", err)
+	}
+	log.Printf("Using config file: %s", viper.ConfigFileUsed())
+
+	server := NewServer(cfg)
+
+	done := make(chan os.Signal, 1)
+	signal.Notify(done, os.Interrupt, syscall.SIGINT, syscall.SIGTERM)
+
+	go func() {
+		if err := server.Start(); err != nil && err != http.ErrServerClosed {
+			log.Fatalf("start server error: %v", err)
+		}
+	}()
+	log.Printf("Server started successfully")
+
+	<-done
+	log.Print("Server stopping...")
+
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	if err := server.Shutdown(ctx); err != nil {
+		log.Printf("Server forced to shutdown: %v", err)
+	}
+	log.Print("Server stopped")
+}