sync: Display protocol events on about:sync

chrome/browser/resources/sync_internals/about.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-function highlightIfChanged(node, oldVal, newVal) {
-  function clearHighlight() {
-    this.removeAttribute('highlighted');
+cr.define('chrome.sync.about_tab', function() {
+  // Contains the latest snapshot of sync about info.
+  chrome.sync.aboutInfo = {};
+
+  function refreshAboutInfo(aboutInfo) {
+    chrome.sync.aboutInfo = aboutInfo;
+    var aboutInfoDiv = $('about-info');
+    jstProcess(new JsEvalContext(aboutInfo), aboutInfoDiv);
   }
 
-  var oldStr = oldVal.toString();
-  var newStr = newVal.toString();
-  if (oldStr != '' && oldStr != newStr) {
-    // Note the addListener function does not end up creating duplicate
-    // listeners.  There can be only one listener per event at a time.
-    // Reference: https://developer.mozilla.org/en/DOM/element.addEventListener
-    node.addEventListener('webkitAnimationEnd', clearHighlight, false);
-    node.setAttribute('highlighted', '');
+  function onAboutInfoUpdatedEvent(e) {
+    refreshAboutInfo(e.details);
   }
-}
 
-(function() {
-// Contains the latest snapshot of sync about info.
-chrome.sync.aboutInfo = {};
+  /** Container for accumulated sync protocol events. */
+  var protocolEvents = [];
 
-function refreshAboutInfo(aboutInfo) {
-  chrome.sync.aboutInfo = aboutInfo;
-  var aboutInfoDiv = $('aboutInfo');
-  jstProcess(new JsEvalContext(aboutInfo), aboutInfoDiv);
-}
+  /**
+   * Callback for incoming protocol events.
+   * @param {Event} e The protocol event.
+   */
+  function onReceivedProtocolEvent(e) {
+    var details = e.details;
+    protocolEvents.push(details);
 
-function onAboutInfoUpdatedEvent(e) {
-  refreshAboutInfo(e.details);
-}
+    var context = new JsEvalContext({ events: protocolEvents });
+    jstProcess(context, $('traffic-event-container'));
+  }
 
-function onLoad() {
-  $('status-data').hidden = true;
+  /**
+   * Initializes state and callbacks for the protocol event log UI.
+   */
+  function initProtocolEventLog() {
+    chrome.sync.events.addEventListener(
+        'onProtocolEvent', onReceivedProtocolEvent);
 
-  chrome.sync.events.addEventListener(
-      'onAboutInfoUpdated',
-      onAboutInfoUpdatedEvent);
-  chrome.sync.requestUpdatedAboutInfo();
+    // Make the prototype jscontent element disappear.
+    jstProcess({}, $('traffic-event-container'));
+  }
 
-  var dumpStatusButton = $('dump-status');
-  dumpStatusButton.addEventListener('click', function(event) {
-    var aboutInfo = chrome.sync.aboutInfo;
-    if (!$('include-ids').checked) {
-      aboutInfo.details = chrome.sync.aboutInfo.details.filter(function(el) {
-        return !el.is_sensitive;
-      });
-    }
-    var data = '';
-    data += new Date().toString() + '\n';
-    data += '======\n';
-    data += 'Status\n';
-    data += '======\n';
-    data += JSON.stringify(aboutInfo, null, 2) + '\n';
+  /**
+   * Toggles the given traffic event entry div's "expanded" state.
+   * @param {HTMLElement} element the element to toggle.
+   */
+  function expandListener(element) {
+    element.target.classList.toggle('traffic-event-entry-expanded');
+  }
 
-    $('status-text').value = data;
-    $('status-data').hidden = false;
-  });
+  /**
+   * Attaches a listener to the given traffic event entry div.
+   * @param {HTMLElement} element the element to attach the listener to.
+   */
+  function addExpandListener(element) {
+    element.addEventListener('click', expandListener, false);
+  }
 
-  var importStatusButton = $('import-status');
-  importStatusButton.addEventListener('click', function(event) {
-    $('status-data').hidden = false;
-    if ($('status-text').value.length == 0) {
-      $('status-text').value = 'Paste sync status dump here then click import.';
-      return;
-    }
+  function onLoad() {
+    $('status-data').hidden = true;
 
-    // First remove any characters before the '{'.
-    var data = $('status-text').value;
-    var firstBrace = data.indexOf('{');
-    if (firstBrace < 0) {
-      $('status-text').value = 'Invalid sync status dump.';
-      return;
-    }
-    data = data.substr(firstBrace);
-
-    // Remove listeners to prevent sync events from overwriting imported data.
-    chrome.sync.events.removeEventListener(
+    chrome.sync.events.addEventListener(
         'onAboutInfoUpdated',
         onAboutInfoUpdatedEvent);
+    chrome.sync.requestUpdatedAboutInfo();
 
-    var aboutInfo = JSON.parse(data);
-    refreshAboutInfo(aboutInfo);
-  });
-}
+    var dumpStatusButton = $('dump-status');
+    dumpStatusButton.addEventListener('click', function(event) {
+      var aboutInfo = chrome.sync.aboutInfo;
+      if (!$('include-ids').checked) {
+        aboutInfo.details = chrome.sync.aboutInfo.details.filter(function(el) {
+          return !el.is_sensitive;
+        });
+      }
+      var data = '';
+      data += new Date().toString() + '\n';
+      data += '======\n';
+      data += 'Status\n';
+      data += '======\n';
+      data += JSON.stringify(aboutInfo, null, 2) + '\n';
 
-document.addEventListener('DOMContentLoaded', onLoad, false);
-})();
+      $('status-text').value = data;
+      $('status-data').hidden = false;
+    });
+
+    var importStatusButton = $('import-status');
+    importStatusButton.addEventListener('click', function(event) {
+      $('status-data').hidden = false;
+      if ($('status-text').value.length == 0) {
+        $('status-text').value =
+            'Paste sync status dump here then click import.';
+        return;
+      }
+
+      // First remove any characters before the '{'.
+      var data = $('status-text').value;
+      var firstBrace = data.indexOf('{');
+      if (firstBrace < 0) {
+        $('status-text').value = 'Invalid sync status dump.';
+        return;
+      }
+      data = data.substr(firstBrace);
+
+      // Remove listeners to prevent sync events from overwriting imported data.
+      chrome.sync.events.removeEventListener(
+          'onAboutInfoUpdated',
+          onAboutInfoUpdatedEvent);
+
+      var aboutInfo = JSON.parse(data);
+      refreshAboutInfo(aboutInfo);
+    });
+
+    initProtocolEventLog();
+  }
+
+  return {
+    onLoad: onLoad,
+    addExpandListener: addExpandListener
+  };
+});
+
+document.addEventListener(
+    'DOMContentLoaded', chrome.sync.about_tab.onLoad, false);