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<html>
<head>
<title>WebSockets Latency Test</title>
</head>
<body>
Host: <input id='host' style='width:100'>
Port: <input id='port' style='width:50'>
Encrypt: <input id='encrypt' type='checkbox'>
<br>
Payload Size: <input id='payload_size' style='width:50'>
Send Delay (ms): <input id='sendDelay' style='width:50' value="10">
<input id='connectButton' type='button' value='Start' style='width:100px'
onclick="connect();">
<br><br>
<table border=1>
<tr>
<th align="right">Packets sent:</th>
<td align="right"><div id='sent'></div></td>
</tr><tr>
<th align="right">Packets Received:</th>
<td align="right"><div id='received'></div></td>
</tr><tr>
<th align="right">Average Latency:</th>
<td align="right"><div id='laverage'></div></td>
</tr><tr>
<th align="right">40 Frame Running Average Latency:</th>
<td align="right"><div id='lrunning'></div></td>
</tr><tr>
<th align="right">Minimum Latency:</th>
<td align="right"><div id='lmin'></div></td>
</tr><tr>
<th align="right">Maximum Latency:</th>
<td align="right"><div id='lmax'></div></td>
</tr>
</table>
<br>
Messages:<br>
<textarea id="messages" style="font-size: 9;" cols=80 rows=10></textarea>
</body>
<script>
var host = null, port = null, sendDelay = 0,
ws = null, send_ref = null,
sent, received, latencies, ltotal, laverage, lrunning, lmin, lmax,
run_length = 40,
payload_size = 2000, payload,
msg_cnt = 0, recv_seq = 0, send_seq = 0;
Array.prototype.pushStr = function (str) {
var n = str.length;
for (var i=0; i < n; i++) {
this.push(str.charCodeAt(i));
}
}
function message(str) {
console.log(str);
cell = document.getElementById('messages');
msg_cnt++;
cell.innerHTML += msg_cnt + ": " + str + "\n";
cell.scrollTop = cell.scrollHeight;
}
function add (x,y) {
return parseInt(x,10)+parseInt(y,10);
}
function recvMsg(data) {
//console.log(">> check_respond");
var i, now, arr, first, last, arr, latency;
now = (new Date()).getTime(); // Early as possible
arr = new Uint8Array(data);
first = String.fromCharCode(arr[0]);
last = String.fromCharCode(arr[arr.length-1]);
if (first != "^") {
message("Error: packet missing start char '^'");
disconnect();
return;
}
if (last != "$") {
message("Error: packet missing end char '$'");
disconnect();
return;
}
text = ''
for (var i = 1; i < arr.length-1; i++) {
text += String.fromCharCode(arr[i]);
}
arr = text.split(':');
seq = arr[0];
timestamp = parseInt(arr[1],10);
rpayload = arr[2];
if (seq != recv_seq) {
message("Error: expected seq " + recv_seq + " but got " + seq);
disconnect();
return;
}
recv_seq++;
if (payload !== rpayload) {
message("Payload corrupt");
disconnect();
return;
}
received++;
latency = now - timestamp;
latencies.push(latency);
if (latencies.length > run_length) {
latencies.shift();
}
ltotal += latency;
laverage = ltotal / received;
lrunning = 0;
for (var i=0; i < latencies.length; i++) {
lrunning += latencies[i];
}
lrunning = lrunning / latencies.length;
if (latency < lmin) {
lmin = latency;
}
if (latency > lmax) {
lmax = latency;
}
showStats();
//console.log("<< check_respond");
}
function sendMsg() {
var arr = [];
timestamp = (new Date()).getTime();
arr.pushStr("^" + send_seq + ":" + timestamp + ":" + payload + "$");
send_seq ++;
ws.send(new Uint8Array(arr));
sent++;
showStats();
send_ref = setTimeout(sendMsg, sendDelay);
}
function showStats() {
document.getElementById('sent').innerHTML = sent;
document.getElementById('received').innerHTML = received;
document.getElementById('laverage').innerHTML = laverage.toFixed(2);
document.getElementById('lrunning').innerHTML = lrunning.toFixed(2);
document.getElementById('lmin').innerHTML = lmin.toFixed(2);
document.getElementById('lmax').innerHTML = lmax.toFixed(2);
}
function init_ws() {
console.log(">> init_ws");
var scheme = "ws://";
if (document.getElementById('encrypt').checked) {
scheme = "wss://";
}
var uri = scheme + host + ":" + port;
console.log("connecting to " + uri);
ws = new WebSocket(uri);
ws.binaryType = 'arraybuffer';
ws.addEventListener('message', function(e) {
recvMsg(e.data);
});
ws.addEventListener('open', function() {
send_ref = setTimeout(sendMsg, sendDelay);
});
ws.addEventListener('close', function(e) {
disconnect();
});
ws.addEventListener('error', function(e) {
message("Websock error: " + e);
disconnect();
});
console.log("<< init_ws");
}
function connect() {
console.log(">> connect");
host = document.getElementById('host').value;
port = document.getElementById('port').value;
payload_size = parseInt(document.getElementById('payload_size').value, 10);
sendDelay = parseInt(document.getElementById('sendDelay').value, 10);
if ((!host) || (!port)) {
console.log("must set host and port");
return;
}
if (ws) {
ws.close();
}
init_ws();
// Populate payload data
var numlist = []
for (var i=0; i < payload_size; i++) {
numlist.push( Math.floor(Math.random()*10) );
}
payload = numlist.join('');
// Initialize stats
sent = 0;
received = 0;
latencies = [];
ltotal = 0;
laverage = 0;
lrunning = 0;
lmin = 999999999;
lmax = 0;
document.getElementById('connectButton').value = "Stop";
document.getElementById('connectButton').onclick = disconnect;
console.log("<< connect");
}
function disconnect() {
console.log(">> disconnect");
if (ws) {
ws.close();
}
if (send_ref) {
clearInterval(send_ref);
send_ref = null;
}
showStats(); // Final numbers
recv_seq = 0;
send_seq = 0;
document.getElementById('connectButton').value = "Start";
document.getElementById('connectButton').onclick = connect;
console.log("<< disconnect");
}
window.onload = function() {
console.log("onload");
var url = document.location.href;
document.getElementById('host').value = (url.match(/host=([^&#]*)/) || ['',window.location.hostname])[1];
document.getElementById('port').value = (url.match(/port=([^&#]*)/) || ['',window.location.port])[1];
document.getElementById('payload_size').value = payload_size;
}
</script>
</html>
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