Unhandled error event

[kelcon]

Description

I receive global unhandled error event causing app to crash.

Steps to reproduce

Steps to reproduce the behavior:

I am not able to reproduce. It is quite random.

Code:

  let server = TcpSocket.createServer( async function(socket) {

    socket.on('error', (err) => {
      console.warn('socket error: '+err);
      try {
        socket.destroy();
      } catch (err) {
        console.warn('Socket destroy error (on socket error): '+err);
      }
    });

    socket.on('data', async (data) => {  });

    socket.on('close', (err) => {      
      console.warn('socket closed: '+err);
    });

});

server.listen(serverOptions, () => {});

  // restart server in case of app going back to foreground
  AppState.addEventListener("change", async (state) => {
    if (state == 'active' && disabled == false) {

      if (typeof server !== 'undefined') {
         console.warn('State changed to active. Server respawned');
         try {
            server.close();
         } catch (err) {
          console.warn('Server close error on state change: '+err);
         }
         try {
            server = await createTcpServer(storage, serverOptions);
         } catch(err) {
            console.warn('Server creation error on state change: '+err);
         }

      }

    }
  })

Current behavior

A clear and concise description of what happened.

{
  "message": "Error: Unhandled error. (undefined)",
  "stack": [
    {
      "functionName": "emit",
      "lineNumber": 141,
      "columnNumber": 14,
      "fileName": "node_modules/events/events.js"
    },
    {
      "functionName": "_eventEmitter.addListener$argument_1",
      "lineNumber": 62,
      "columnNumber": 12,
      "fileName": "node_modules/react-native-tcp-socket/src/TcpSocket.js"
    },
    {
      "functionName": "emit",
      "lineNumber": 189,
      "columnNumber": 10,
      "fileName": "node_modules/react-native/Libraries/vendor/emitter/EventEmitter.js"
    },
    {
      "functionName": "__callFunction",
      "lineNumber": 425,
      "columnNumber": 19,
      "fileName": "node_modules/react-native/Libraries/BatchedBridge/MessageQueue.js"
    },
    {
      "functionName": "__guard$argument_0",
      "lineNumber": 112,
      "columnNumber": 6,
      "fileName": "node_modules/react-native/Libraries/BatchedBridge/MessageQueue.js"
    },
    {
      "functionName": "__guard",
      "lineNumber": 373,
      "columnNumber": 10,
      "fileName": "node_modules/react-native/Libraries/BatchedBridge/MessageQueue.js"
    },
    {
      "functionName": "callFunctionReturnFlushedQueue",
      "lineNumber": 111,
      "columnNumber": 4,
      "fileName": "node_modules/react-native/Libraries/BatchedBridge/MessageQueue.js"
    },
    {
      "functionName": "callFunctionReturnFlushedQueue",
      "lineNumber": null,
      "columnNumber": null,
      "fileName": "[native code]"
    }
  ]
}

Expected behavior

Not to crash

Relevant information

OS	13.3
react-native	0.62.2
react-native-tcp-socket	4.2.0

[Rapsssito]

@kelcon, do you have any more information? When does this error occur? What line is causing the error?

[kelcon]

I assume, that it might be a my fault related to not having 'error' listener attached to the server (not socket)

[Rapsssito]

@kelcon, if you add an error listener, do you get any more information?

[github-actions[bot]]

Hey there, it looks like there has been no activity on this issue recently. Has the issue been fixed, or does it still require the community attention? This issue may be closed if no further activity occurs.

[mi-mazouz]

Same issue, adding error event does not provide more information...

[Rapsssito]

@mi-mazouz, did you add the error listener to both sockets?

[DarshanPatel64]

this works fine for me.. ✌✌✌😃😃

startServer = () => {
    const server = TcpSocket.createServer(function(socket) {
      socket.on('data', function(data){
        socket.write("Client Connected");
      });
      socket.on('error', (error) => {
        console.log('error: ', error);
      });

      socket.on('close', () => {
        console.log('connection closed ', socket.address());
      });
    }).listen({ port: 12345});

    server.on('error', (error) => {
      console.log('An error ocurred with the server', error);
    });

    server.on('close', () => {
      console.log('Server closed connection');
    });

    this.setState({
      myServer:server
    });
  }

  startClient = () => {
    const client = TcpSocket.createConnection({
        port: 12345, 
        host: this.state.ip, 
        interface: 'wifi'  
    }, () => {
      client.write("connected to server ");
    });

    client.on('data', function(data) {
      console.log('message was received', data);
    });

    client.on('error', function(error) {
      console.log(error);
    });

    client.on('close', function(){
      console.log('Connection closed!');
    });

    this.setState({
      myClient:client
    });
  }