CODEWITHSUNDEEP
node.jswebsocket
Lutz Büch
Lutz Büch

Reputation: 363

node.js ws: How to identify which websocket sent a message?

I am wondering if the server implementation in the ws library allows to find out, which connected client triggered a message event. I am hoping I can avoid to dive into the code to find out...

Thanks!

P.S.: I am aware of the FAQ: How to get the IP address of the client?, but that refers to the situation of a new connection. I am interested in the event of an incoming message.

Upvotes: 1

Views: 2427

Answers (1)

Lutz Büch
Lutz Büch

Reputation: 363

Wait, never mind - I figured it out. It is actually pretty obvious.

When you define the closure that deals with a message for a websocket ws, you have to be in a context where ws is defined - i.e., the closure of the websocket server wss's on-function for the 'connection' event. And there you also have access to the request object req that gives you the remote address:

const WebSocket = require('ws');
const wss = new WebSocket.Server({ port: 8080 });
wss.on('connection', function connection(ws, req) {
  console.log('connected: '+req.connection.remoteAddress);
  ws.on('message', function incoming(message) {
    console.log('received from %s: %s', req.connection.remoteAddress, message);
    // do stuff with the message
  });
});

Upvotes: 1

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