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<!DOCTYPE html>
<html>
<head>
<title>Ping - EventDance examples</title>
<style>
table {
width: 150px;
}
.topic {
font-weight: bold;
padding-top: 10px;
}
.field, .value {
text-align: right;
white-space: nowrap;
}
</style>
<script type="text/javascript" src="/transport/evdWebTransport.js"></script>
<script type="text/javascript">
var peer;
var interval = 1;
var second = 0;
var payloadSize = 1024;
var payload = "";
var stat;
function $ (id) {
return document.getElementById (id);
}
function init () {
stat = {
totalPacketsSent: 0,
totalPacketsReceived: 0,
totalPacketsLost: 0,
packetsReceivedLastSecond: 0,
maxRoundtripTime: 0,
minRoundtripTime: 1000000,
sumRoundtripTime: 0,
meanRoundtripTime: 0
};
payload = "";
for (var i=0; i<payloadSize; i++)
payload += String.fromCharCode (33 + Math.floor (Math.random () * 64));
}
function onPeerReceive (peer) {
var data = peer.receiveText ();
var tokens = data.split (" ");
var num = tokens[0];
var _payload = tokens[1];
stat.totalPacketsReceived++;
if (num != stat.totalPacketsSent)
stat.totalPacketsLost++;
if (_payload != payload) {
alert ("payload corrupted!");
return;
}
var time = (new Date ()).valueOf ();
var latency = time - stat.lastSentTime.valueOf ();
if (latency > stat.maxRoundtripTime)
stat.maxRoundtripTime = latency;
if (latency < stat.minRoundtripTime)
stat.minRoundtripTime = latency;
stat.sumRoundtripTime += latency;
var mean = Math.floor ( (stat.sumRoundtripTime / stat.totalPacketsReceived) * 100) / 100;
var lost = stat.totalPacketsLost;
var percentageLost = lost / stat.totalPacketsSent * 100;
var _second = Math.floor (time / 1000);
if (_second > second) {
second = _second;
var ppp = stat.totalPacketsReceived - stat.packetsReceivedLastSecond;
stat.packetsReceivedLastSecond = stat.totalPacketsReceived;
$ ("packetsPerSecond").innerHTML = ppp;
}
$ ("totalPongs").innerHTML = stat.totalPacketsReceived;
$ ("totalLost").innerHTML = lost + " (" + percentageLost + "%)";
$ ("roundtripTime").innerHTML = latency;
$ ("maxRoundtripTime").innerHTML = stat.maxRoundtripTime;
$ ("minRoundtripTime").innerHTML = stat.minRoundtripTime;
$ ("meanRoundtripTime").innerHTML = mean;
setTimeout (send, interval);
}
function onNewPeer (p) {
peer = p;
send ();
}
function onPeerClosed (p, gracefully) {
peer = null;
}
function start () {
init ();
var transport = new Evd.WebTransport ();
transport.addEventListener ("new-peer", onNewPeer);
transport.addEventListener ("peer-closed", onPeerClosed);
transport.addEventListener ("receive", onPeerReceive);
transport.open ();
}
function send () {
stat.totalPacketsSent++;
stat.lastSentTime = new Date ();
$ ("totalPings").innerHTML = stat.totalPacketsSent;
var msg = stat.totalPacketsSent + " " + payload;
peer.sendText (msg);
}
</script>
</head>
<body onload="start ()" onunload="if (peer) peer.close (false)">
<h3>Packets</h3>
<table>
<tr>
<td class="field">Sent:</td>
<td class="value" id="totalPings"></td>
</tr>
<tr>
<td class="field">Received:</td>
<td class="value" id="totalPongs"></td>
</tr>
<tr>
<td class="field">Lost:</td>
<td class="value" id="totalLost"></td>
</tr>
<tr>
<td class="field">Per second:</td>
<td class="value" id="packetsPerSecond"></td>
</tr>
</table>
<h3>Round-trip time (miliseconds)</h3>
<table>
<tr>
<td class="field">Last:</td>
<td class="value" id="roundtripTime"></td>
</tr>
<tr>
<td class="field">Min:</td>
<td class="value" id="minRoundtripTime"></td>
</tr>
<tr>
<td class="field">Max:</td>
<td class="value" id="maxRoundtripTime"></td>
</tr>
<tr>
<td class="field">Mean:</td>
<td class="value" id="meanRoundtripTime"></td>
</tr>
</table>
</body>
</html>
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