如何从onmessage msg获取Websocket主机？

Question

I have multiple websocket servers that are communicating with a single page, and I'm running a list of callbacks to handle onmessage events from the servers. In order to reuse some functions for debugging I want to know where the messages are coming from from the msg object.

...

socket1Callbacks = $.Callbacks();
socket2Callbacks = $.Callbacks();
socket1Callbacks.add(logIncoming);
socket2Callbacks.add(logIncoming);

...

socket1.onmessage = function (msg) {
   socket1Callbacks.fire(msg);
};
socket2.onmessage = function (msg) {
    socket2Callbacks.fire(msg);
};

...

function logIncoming(msg) {
    console.log('MSG FROM HOST:' + msg.????host????);
    console.log('Recieved: ' + msg.data);
}

Answer 1

Inside the incoming message callback:

socket2.onmessage = function (msg) {
    console.log(this.url); // the connected host
};

If you want need it inside logIncoming function, simply wrap the incoming message with your own object, containing the host:

socket2.onmessage = function (msg) {
    socket2Callback.fire({ host: this.url, data: msg });
};

And then

function logIncoming(msg) {
    console.log('MSG FROM HOST:' + msg.host);
    console.log('Received: ' + msg.data);
}