sku-pg

Version:
Skulpt is a Javascript implementation of Python 2.x. Python that runs in your browser!
www.skulpt.org
108 lines (89 loc) • 2.68 kB
HTML
<!DOCTYPE html>
<!--
  Author: bpearcy@google.com (Brandon Pearcy)

  This file is responsible for setting up the inner peer half of an XPC
  communication channel. It instantiates a CrossPageChannel and attempts to
  connect to the outer peer. The XPC configuration should match that of the
  outer peer (i.e. same channel name, polling URIs, etc).
-->
<html>
<!--
Copyright 2009 The Closure Library Authors. All Rights Reserved.

Use of this source code is governed by an Apache 2.0 License.
See the COPYING file for details.
-->

<head>
<script src="../../../base.js"></script>
<script>
goog.require('goog.debug.Logger');
goog.require('goog.dom');
goog.require('goog.events');
goog.require('goog.events.EventType');
goog.require('goog.net.xpc.CrossPageChannel');
</script>
<script>
var channel;
var queuedMessage;

function clearDebug() {
  document.getElementById('debugDiv').innerHTML = '';
}

function instantiateChannel(cfg) {
  if (window.channel) {
    window.channel.dispose();
  }
  window.channel = new goog.net.xpc.CrossPageChannel(cfg);
  window.channel.registerService('echo', echoHandler);
}

function connectChannel(opt_callback) {
  var callback = opt_callback || goog.nullFunction;

  window.channel.connect(function() {
    callback();

    var message = window.queuedMessage;
    if (message) {
      window.queuedMessage = null;
      echoHandler(message);
    }
  });
}

function isConnected() {
  return window.channel && window.channel.isConnected();
}

function echoHandler(payload) {
  // TODO(user): Works around the bug where the parent
  // can get the connect callback before the child is
  // marked as connected.
  if (isConnected()) {
    window.channel.send('msg', payload);
  } else {
    window.queuedMessage = payload;
  }
}

function handleLoad(evt) {
  // Get the channel configuration passed by the containing document.
  var xpc = (new goog.Uri(window.location.href)).getParameterValue('xpc');
  if (xpc) {
    var cfg = goog.json.parse(xpc);
    instantiateChannel(cfg);
    connectChannel();
  }
}

goog.events.listen(window, goog.events.EventType.LOAD, handleLoad);

</script>
</head>

<body>

<div style="position:absolute">
  Debug [<a href="#" onclick="clearDebug()">clear</a>]: <br>
  <div id=debugDiv style="border: 1px #000000 solid; font-size:xx-small"></div>
</div>

<script>
var debugDiv = goog.dom.getElement('debugDiv');
var logger = goog.debug.Logger.getLogger('goog.net.xpc');
logger.setLevel(goog.debug.Logger.Level.ALL);
logger.addHandler(function(logRecord) {
  var msgElm = goog.dom.createDom('div');
  msgElm.innerHTML = logRecord.getMessage();
  goog.dom.appendChild(debugDiv, msgElm);
});
</script>

</body>

</html>