feat: graceful shutdown with signal handling and backup scheduler

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

main.go

@@ -1,10 +1,13 @@
 package main
 
 import (
+	"context"
 	"fmt"
 	"log"
 	"log/slog"
 	"os"
+	"os/signal"
+	"syscall"
 	"time"
 
 	"github.com/tolelom/catacombs/config"
@@ -38,16 +41,93 @@ func main() {
 	defer db.Close()
 
 	lobby := game.NewLobby(cfg)
+	startTime := time.Now()
 
 	sshAddr := fmt.Sprintf("0.0.0.0:%d", cfg.Server.SSHPort)
 	webAddr := fmt.Sprintf(":%d", cfg.Server.HTTPPort)
 
-	startTime := time.Now()
+	// Start web server (non-blocking, returns *http.Server)
 	webServer := web.Start(webAddr, cfg.Server.SSHPort, lobby, db, startTime)
-	_ = webServer // used later for graceful shutdown
+
+	// Create SSH server
+	sshServer, err := server.NewServer(sshAddr, lobby, db)
+	if err != nil {
+		log.Fatalf("Failed to create SSH server: %v", err)
+	}
+
+	// Start backup scheduler
+	backupDone := make(chan struct{})
+	go backupScheduler(db, cfg.Backup, backupDone)
+
+	// Start SSH server in background
+	sshErrCh := make(chan error, 1)
+	go func() {
+		slog.Info("starting SSH server", "addr", sshAddr)
+		sshErrCh <- sshServer.ListenAndServe()
+	}()
 
 	slog.Info("server starting", "ssh_port", cfg.Server.SSHPort, "http_port", cfg.Server.HTTPPort)
-	if err := server.Start(sshAddr, lobby, db); err != nil {
-		log.Fatal(err)
+
+	// Wait for shutdown signal or SSH server error
+	sigCh := make(chan os.Signal, 1)
+	signal.Notify(sigCh, syscall.SIGINT, syscall.SIGTERM)
+
+	select {
+	case sig := <-sigCh:
+		slog.Info("shutdown signal received", "signal", sig)
+	case err := <-sshErrCh:
+		if err != nil {
+			slog.Error("SSH server error", "error", err)
+		}
+	}
+
+	// Graceful shutdown
+	slog.Info("starting graceful shutdown")
+
+	// Stop backup scheduler
+	close(backupDone)
+
+	// Shutdown web server (5s timeout)
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+	if err := webServer.Shutdown(ctx); err != nil {
+		slog.Error("web server shutdown error", "error", err)
+	}
+
+	// Shutdown SSH server (10s timeout for active sessions)
+	ctx2, cancel2 := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel2()
+	if err := sshServer.Shutdown(ctx2); err != nil {
+		slog.Error("SSH server shutdown error", "error", err)
+	}
+
+	// Final backup before exit
+	if path, err := db.Backup(cfg.Backup.Dir); err != nil {
+		slog.Error("final backup failed", "error", err)
+	} else {
+		slog.Info("final backup completed", "path", path)
+	}
+
+	slog.Info("server stopped")
+}
+
+func backupScheduler(db *store.DB, cfg config.BackupConfig, done chan struct{}) {
+	if cfg.IntervalMin <= 0 {
+		return
+	}
+	ticker := time.NewTicker(time.Duration(cfg.IntervalMin) * time.Minute)
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-done:
+			return
+		case <-ticker.C:
+			if path, err := db.Backup(cfg.Dir); err != nil {
+				slog.Error("scheduled backup failed", "error", err)
+			} else {
+				slog.Info("scheduled backup completed", "path", path)
+			}
+		}
 	}
 }