NestJSNestJS hỗ trợ WebSockets qua @WebSocketGateway() decorator, tích hợp với socket.io hoặc ws. Gateway là class đặc biệt giống Controller nhưng xử lý WebSocket events.
Gateway implement 3 interfaces: OnGatewayInit (sau khi khởi tạo), OnGatewayConnection (client connect), OnGatewayDisconnect (client disconnect). @WebSocketServer() inject server instance. @SubscribeMessage('event') handle event từ client, tương tự @Get() trong controller. @MessageBody() và @ConnectedSocket() là param decorators cho WS.
Broadcast: this.server.emit() gửi cho tất cả, this.server.to(room).emit() gửi cho room, client.to(room).emit() gửi cho room trừ sender. Guards và Interceptors hoạt động với WS Gateway giống HTTP. Namespace với namespace: '/chat' trong decorator options để tách biệt connections.
NestJS supports WebSockets via the @WebSocketGateway() decorator, integrating with socket.io or ws. A Gateway is a special class similar to a Controller but handling WebSocket events.
Gateways implement 3 interfaces: OnGatewayInit (after initialization), OnGatewayConnection (client connects), OnGatewayDisconnect (client disconnects). @WebSocketServer() injects the server instance. @SubscribeMessage('event') handles events from clients, similar to @Get() in controllers. @MessageBody() and @ConnectedSocket() are param decorators for WebSockets.
Broadcasting: this.server.emit() sends to all, this.server.to(room).emit() sends to a room, client.to(room).emit() sends to a room excluding the sender. Guards and Interceptors work the same on WS Gateways as on HTTP. Use namespace: '/chat' in decorator options to separate connections.