create a websocket game server

game-server/cmd/server/main.go

@@ -0,0 +1,63 @@
+package main
+
+import (
+	"context"
+	"errors"
+	"log/slog"
+	"net/http"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+
+	"github.com/ruby-sea-battle/game-server/internal/config"
+	"github.com/ruby-sea-battle/game-server/internal/game"
+	"github.com/ruby-sea-battle/game-server/internal/ws"
+)
+
+func main() {
+	log := slog.New(slog.NewTextHandler(os.Stdout, nil))
+
+	cfg, err := config.Load()
+	if err != nil {
+		log.Error("configuration error", "err", err)
+		os.Exit(1)
+	}
+
+	manager := game.NewManager(cfg.JoinTimeout)
+	handler := ws.NewHandler(manager, cfg.JWTSecret, cfg.PublicAddr, cfg.AllowedOrigins, log)
+
+	mux := http.NewServeMux()
+	mux.Handle("/ws", handler)
+	mux.HandleFunc("/healthz", func(w http.ResponseWriter, _ *http.Request) {
+		w.WriteHeader(http.StatusOK)
+		_, _ = w.Write([]byte("ok"))
+	})
+
+	srv := &http.Server{
+		Addr:              cfg.ListenAddr,
+		Handler:           mux,
+		ReadHeaderTimeout: 10 * time.Second,
+	}
+
+	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
+	defer stop()
+
+	go func() {
+		log.Info("game server listening",
+			"listen_addr", cfg.ListenAddr,
+			"public_addr", cfg.PublicAddr,
+			"join_timeout", cfg.JoinTimeout,
+		)
+		if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
+			log.Error("server failed", "err", err)
+			os.Exit(1)
+		}
+	}()
+
+	<-ctx.Done()
+	log.Info("shutting down")
+	shutdownCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+	_ = srv.Shutdown(shutdownCtx)
+}