NestJs Websocket，如何测试和调试“Socket hang up”？

Posted 2023-04-18

【中文标题】NestJs Websocket，如何测试和调试“Socket hang up”？

【英文标题】：NestJs Websocket, how to test and debug "Socket hang up"?

【发布时间】：2022-01-20 11:51:09

【问题描述】：

我有一个相当简单的 Websocket 服务器，我想要实现的只是拥有一个套接字网关，它会根据数据库状态更新向侦听/连接的客户端发出事件。

这是我的实现：

@WebSocketGateway(5010,  transports: ['websocket'], cors: true )
export class SocketGateway
  implements OnGatewayConnection, OnGatewayDisconnect

  private readonly logger: Logger = new Logger(SocketGateway.name);
  @WebSocketServer() server: Server;

  constructor(private readonly socketService: SocketService) 

  @SubscribeMessage('statusUpdate')
  updateStatus(data: any) 
    this.server.emit('statusUpdate', data);
  

  handleConnection(client: any, ...args: any[]): any 
    return this.logger.log(`Client disconnected: $client.id`);
  

  handleDisconnect(client: any): any 
    return this.logger.log(`Client connected: $client.id`);
  

现在我正在尝试通过连接到此 URL 来使用邮递员进行连接 ws://localhost:5010

导致此错误socket hang up 不太确定它为什么会这样，也没有足够的信息来调试它。 如果有人能分享关于在哪里看的提示，我将不胜感激。

我在 macOS Monterey：12.0.1（最后更新）

已安装的 Websocket 库：

@nestjs/platform-socket.io：8.2.4

@nestjs/websockets": 8.2.4

谢谢

【参考方案1】：

通过e2e测试，你可以试试这个例子：

import * as WebSocket from 'ws'
beforeAll(async () => 
  const moduleFixture = await Test.createTestingModule(
    imports: [
      SocketModule,
    ],
  ).compile()

  app = moduleFixture.createNestApplication()
  app.useWebSocketAdapter(new WsAdapter(app))
  await app.init()
)

it('should connect successfully', (done) => 
  const address = app.getHttpServer().listen().address()
  const baseAddress = `http://[$address.address]:$address.port`

  const socket = new WebSocket(baseAddress)

  socket.on('open', () => 
    console.log('I am connected! YEAAAP')
    done()
  )

  socket.on('close', (code, reason) => 
    done( code, reason )
  )

  socket.on ('error', (error) => 
    done(error)
  )
)

this example is based on this answer