[WebSocket] Calculating Ping?

[Lyerae]

What's the best way to calculate the average ping of a connection, specifically one that is WebSocket-based?

 

[GetTriggerUnit-]

var d1 = new Date();
// wait for response
var d2 = new Date();
var result = d2 - d1;

 

[Lyerae]

Well, that gives me a string ('NaN'), so I tried Date.now();, but it returns negative integers. Is that bad?

 

[GetTriggerUnit-]

Please show the script. Maybe theres another simple error.

 

[Lyerae]

Edit: Well it magically started working. Thanks. I'd +rep, but it says I need to spread some around first. :/

 

[GetTriggerUnit-]

I'm not a websocket pro but if you want to get the ping on the client side, you check the date then you send the request and when you receive the answer, you check the date again. From what i've seen thats not what your script does.

 

[Lyerae]

It's not too fancy:

(function(window) {

	var socket = new WebSocket('ws://thelifelessone.dyndns.org:1024/');
	var input = document.getElementById('input');
	var output = document.getElementById('output');
	var msgCounter = 0;
	var ping;

	setInterval(function() {
		msgCounter--;
	}, 2000);

	socket.onopen = function(e) {
		output.innerText += 'Connected.\n';
	}

	socket.onmessage = function(e) {
		var dJSON = JSON.parse(e.data);
		ping = (dJSON.timestamp - Date.now());
		console.log(Math.abs(ping));
		
		if (dJSON.content != undefined) {
			output.innerText += dJSON.id + ': ' + dJSON.content + '\n';
		}
		window.scroll(0, document.height);
	}

	input.onkeypress = function(e) {
		if (e.keyCode == 13) {
			if (input.value != '') {
				switch(input.value) {
					case ':clear':
						output.innerText = '';
						input.value = '';
						break;
						
					default:
						msg = JSON.stringify({'timestamp': Date.now(), 'content': input.value});
						if (msgCounter != 5) {
							msgCounter++;
							socket.send(msg);
						}
						input.value = '';
						break;
				}
			}
		}
	}

})(window);

Server:

// Requires Node.js with websocket-server.
var ws = require("websocket-server");
var server = ws.createServer();



server.addListener("connection", function(connection){
	console.log('Connection established. ID ' + connection.id + ' assigned.');
	connection.send(JSON.stringify({'id': connection.id}));
	
	connection.addListener('close', function(e) {
		console.log('Client ID ' + connection.id + ' has disconnected.');
	});

	connection.addListener("message", function(msg){
		msg = JSON.parse(msg);
		console.log(msg.timestamp);
			switch(msg) {
				case ':clear':
					break;
				default:
					connection.send(JSON.stringify({
						'id': connection.id,
						'content': msg.content,
						'timestamp': msg.timestamp
					}));
					connection.broadcast(JSON.stringify({
						'id': connection.id,
						'content': msg.content
					}));	
					break;
			}
	});

});

server.listen(1024);
console.log('Listening on port 1024');

It's still a work-in-progress, but it works.

 

[GetTriggerUnit-]

I really wonder how did you do that.

How can you make a server-side in Javascript?

 

[Lyerae]

Node.js