feat(handler,cmd): 实现阶段 5 HTTP 服务 — 处理器、入口程序、配置文件

cmd/server/main.go

@@ -1,5 +1,111 @@
 package main
 
+import (
+	"context"
+	"flag"
+	"log"
+	"os"
+
+	"ai-agent-scaffold-go/internal/config"
+	"ai-agent-scaffold-go/internal/handler"
+	"ai-agent-scaffold-go/internal/model"
+	"ai-agent-scaffold-go/internal/service"
+
+	"github.com/gin-gonic/gin"
+	"github.com/joho/godotenv"
+	"go.uber.org/zap"
+)
+
 func main() {
-	// TODO: 实现启动逻辑
+	envPath := flag.String("env", ".env", "path to dotenv file (empty to skip)")
+	configPath := flag.String("config", "configs/application.yaml", "path to application.yaml")
+	flag.Parse()
+
+	// 1. 加载 .env 文件
+	loadDotenv(*envPath)
+
+	// 2. 加载应用配置
+	appCfg, err := config.LoadApplication(*configPath)
+	if err != nil {
+		log.Fatalf("load config: %v", err)
+	}
+
+	// 3. 初始化日志
+	logger, _ := zap.NewProduction()
+	if appCfg.App.Env == "local" || appCfg.App.Env == "dev" {
+		logger, _ = zap.NewDevelopment()
+	}
+	defer logger.Sync()
+
+	// 4. 组装 Agent
+	registry := model.NewInMemoryAgentRegistry()
+	sessions := model.NewInMemorySessionStore()
+
+	timeout, _ := appCfg.LLM.RequestTimeoutDuration()
+	agents, err := service.LoadAndAssemble(context.Background(), appCfg.Agent.ConfigPaths, timeout)
+	if err != nil {
+		logger.Fatal("assemble agents failed", zap.Error(err))
+	}
+	for _, agent := range agents {
+		if err := registry.Register(agent); err != nil {
+			logger.Fatal("register agent failed", zap.Error(err))
+		}
+	}
+
+	chatService := service.NewChatService(registry, sessions)
+
+	// 5. 配置 HTTP 路由
+	router := gin.Default()
+	router.Use(corsMiddleware())
+	router.GET("/healthz", func(c *gin.Context) {
+		c.JSON(200, gin.H{"status": "ok"})
+	})
+	handler.RegisterRoutes(router, chatService)
+
+	// 6. 启动服务
+	addr := appCfg.Server.Addr
+	logger.Info("server starting", zap.String("addr", addr), zap.Int("agents", len(agents)))
+	if err := router.Run(addr); err != nil {
+		logger.Fatal("server stopped", zap.Error(err))
+	}
+}
+
+// corsMiddleware 跨域中间件
+func corsMiddleware() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		origin := c.GetHeader("Origin")
+		if origin != "" {
+			c.Header("Access-Control-Allow-Origin", origin)
+			c.Header("Vary", "Origin")
+		} else {
+			c.Header("Access-Control-Allow-Origin", "*")
+		}
+		c.Header("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS")
+		c.Header("Access-Control-Allow-Headers", "Content-Type, Authorization")
+		c.Header("Access-Control-Allow-Credentials", "true")
+		if c.Request.Method == "OPTIONS" {
+			c.AbortWithStatus(204)
+			return
+		}
+		c.Next()
+	}
+}
+
+// loadDotenv 加载 dotenv 文件，已有环境变量不会被覆盖
+func loadDotenv(path string) {
+	if path == "" {
+		return
+	}
+	if _, err := os.Stat(path); os.IsNotExist(err) {
+		return
+	}
+	pairs, err := godotenv.Read(path)
+	if err != nil {
+		log.Fatalf("read dotenv: %v", err)
+	}
+	for key, value := range pairs {
+		if _, exists := os.LookupEnv(key); !exists {
+			os.Setenv(key, value)
+		}
+	}
 }