初始提交：边缘AI算力机统一AI通讯层

internal/server/server.go

@@ -0,0 +1,192 @@
+package server
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+
+	"github.com/edgeai/gateway/internal/adapter"
+	"github.com/edgeai/gateway/internal/auth"
+	"github.com/edgeai/gateway/internal/config"
+	"github.com/edgeai/gateway/internal/handler"
+	"github.com/edgeai/gateway/internal/middleware"
+	"github.com/edgeai/gateway/internal/observability"
+	"github.com/edgeai/gateway/internal/router"
+	"github.com/edgeai/gateway/internal/scheduler"
+	"github.com/edgeai/gateway/internal/session"
+)
+
+// Server is the main HTTP server for the AI gateway.
+type Server struct {
+	cfg       *config.Config
+	logger    *observability.Logger
+	metrics   *observability.Metrics
+	HTTPSrv   *http.Server
+	auth      *auth.Authenticator
+	registry  *adapter.Registry
+	modelMap  *router.LogicalModelMapping
+	scheduler *scheduler.Scheduler
+	sessions  *session.Store
+}
+
+// New creates a new Server instance with all components wired.
+func New(cfg *config.Config, logger *observability.Logger) (*Server, error) {
+	// Ensure data directory exists
+	dbPath := extractDBPath(cfg.Storage.SessionDB)
+	if dbPath != "" {
+		os.MkdirAll(filepath.Dir(dbPath), 0755)
+	}
+
+	// Initialize auth
+	authPath := filepath.Join(filepath.Dir(dbPath), "auth.db")
+	authenticator, err := auth.NewAuthenticator(authPath, logger)
+	if err != nil {
+		return nil, fmt.Errorf("init auth: %w", err)
+	}
+
+	// Initialize session store
+	sessionStore, err := session.NewStore(dbPath)
+	if err != nil {
+		return nil, fmt.Errorf("init session store: %w", err)
+	}
+
+	// Initialize adapter registry
+	registry := adapter.NewRegistry()
+
+	// Initialize logical model mapping
+	modelMap := router.NewLogicalModelMapping(cfg)
+
+	// Register adapters for each unique endpoint
+	registered := make(map[string]bool)
+	for _, mc := range cfg.Models {
+		key := mc.Provider + "|" + mc.Endpoint
+		if !registered[key] {
+			switch mc.Provider {
+			case "ollama":
+				registry.Register(mc.Provider, adapter.NewOllamaAdapter(mc.Endpoint))
+			}
+			registered[key] = true
+		}
+	}
+
+	// Initialize scheduler
+	sched := scheduler.NewScheduler(&cfg.Scheduler, logger)
+
+	// Initialize metrics
+	metrics := observability.NewMetrics()
+
+	s := &Server{
+		cfg:       cfg,
+		logger:    logger,
+		metrics:   metrics,
+		auth:      authenticator,
+		registry:  registry,
+		modelMap:  modelMap,
+		scheduler: sched,
+		sessions:  sessionStore,
+	}
+
+	mux := http.NewServeMux()
+	s.registerRoutes(mux)
+
+	// Apply middleware chain (order: Recovery → Logging → RequestID → BodyLimit → Auth → handler)
+	h := middleware.RequestID(mux)
+	h = middleware.BodyLimit(cfg.Server.MaxRequestBodyMB)(h)
+	h = s.auth.Middleware(h)
+	h = middleware.Logging(logger)(h)
+	h = middleware.Recovery(logger)(h)
+
+	s.HTTPSrv = &http.Server{
+		Addr:         fmt.Sprintf("%s:%d", cfg.Server.Host, cfg.Server.Port),
+		Handler:      h,
+		ReadTimeout:  30 * time.Second,
+		WriteTimeout: 0, // no write timeout for SSE
+		IdleTimeout:  120 * time.Second,
+	}
+
+	return s, nil
+}
+
+func (s *Server) registerRoutes(mux *http.ServeMux) {
+	// Health and readiness
+	mux.HandleFunc("/health", s.handleHealth)
+	mux.HandleFunc("/ready", s.handleReady)
+
+	// Metrics
+	mux.HandleFunc(s.cfg.Observability.MetricsPath, s.metrics.Handler())
+
+	// OpenAI-compatible API
+	mux.HandleFunc("/v1/chat/completions", s.handleChatCompletions)
+	mux.HandleFunc("/v1/models", s.handleModels)
+
+	// Session management
+	mux.HandleFunc("/v1/sessions", s.handleSessions)
+	mux.HandleFunc("/v1/sessions/", s.handleSessionByID)
+}
+
+// Authenticator returns the authenticator instance (for testing/management).
+func (s *Server) Authenticator() *auth.Authenticator {
+	return s.auth
+}
+
+// Start begins listening for HTTP requests.
+func (s *Server) Start() error {
+	s.logger.Info("http server starting", observability.F().
+		Event("server_start").
+		Set("addr", s.HTTPSrv.Addr))
+	return s.HTTPSrv.ListenAndServe()
+}
+
+// Shutdown gracefully shuts down the server.
+func (s *Server) Shutdown() error {
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	s.scheduler.Stop()
+	if s.sessions != nil {
+		s.sessions.Close()
+	}
+	if s.auth != nil {
+		s.auth.Close()
+	}
+
+	return s.HTTPSrv.Shutdown(ctx)
+}
+
+func (s *Server) handleHealth(w http.ResponseWriter, r *http.Request) {
+	handler.WriteJSON(w, http.StatusOK, map[string]string{"status": "ok"})
+}
+
+func (s *Server) handleReady(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+
+	ready := true
+	reasons := []string{}
+
+	for _, name := range s.registry.Names() {
+		a, _ := s.registry.Get(name)
+		if err := a.HealthCheck(r.Context()); err != nil {
+			ready = false
+			reasons = append(reasons, fmt.Sprintf("%s: %v", name, err))
+		}
+	}
+
+	if ready {
+		w.WriteHeader(http.StatusOK)
+		w.Write([]byte(`{"status":"ready"}`))
+	} else {
+		w.WriteHeader(http.StatusServiceUnavailable)
+		fmt.Fprintf(w, `{"status":"not_ready","reasons":["%s"]}`, strings.Join(reasons, `","`))
+	}
+}
+
+func extractDBPath(connStr string) string {
+	if strings.HasPrefix(connStr, "sqlite://") {
+		return strings.TrimPrefix(connStr, "sqlite://")
+	}
+	return connStr
+}