[bug] make shutdown reliable

src/simple-server.ts

@@ -377,25 +377,50 @@ export class Server {
 
   public shutdown() {
     console.log('🛑 Shutting down server...');
+    
+    // Close all active client connections first
+    for (const [ws, clientId] of this.clients.entries()) {
+      console.log(`🔌 Closing connection to ${clientId}...`);
+      ws.close(1000, 'Server shutting down');
+    }
+    this.clients.clear();
+    
+    // Close the WebSocket server
     this.wss.close(() => {
       console.log('✅ Server shutdown complete');
       process.exit(0);
     });
+    
+    // Force exit after a timeout if graceful shutdown fails
+    setTimeout(() => {
+      console.log('⚠️ Force shutdown after timeout');
+      process.exit(1);
+    }, 5000);
   }
 }
 
 // Handle graceful shutdown
+let isShuttingDown = false;
+
 process.on('SIGINT', () => {
+  if (isShuttingDown) return;
+  isShuttingDown = true;
   console.log('\n🛑 Received SIGINT, shutting down gracefully...');
   if (server) {
     server.shutdown();
+  } else {
+    process.exit(0);
   }
 });
 
 process.on('SIGTERM', () => {
+  if (isShuttingDown) return;
+  isShuttingDown = true;
   console.log('\n🛑 Received SIGTERM, shutting down gracefully...');
   if (server) {
     server.shutdown();
+  } else {
+    process.exit(0);
   }
 });