sync: Re-implement getAllNodes WebUI function

chrome/browser/resources/sync_internals/data.js

 // Copyright (c) 2011 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() {
 var dumpToTextButton = $('dump-to-text');
 var dataDump = $('data-dump');
 dumpToTextButton.addEventListener('click', function(event) {
   // TODO(akalin): Add info like Chrome version, OS, date dumped, etc.
 
@@ skipping 39 matching lines @@
 ];
 
 function versionToDateString(version) {
   // TODO(mmontgomery): ugly? Hacky? Is there a better way?
   var epochLength = Date.now().toString().length;
   var epochTime = parseInt(version.slice(0, epochLength));
   var date = new Date(epochTime);
   return date.toString();
 }
 
-function getFields(node) {
+/**
+ * @param {!Object} node A JavaScript represenation of a sync entity.
+ * @return {string} A string representation of the sync entity.
+ */
+function serializeNode(node) {
   return allFields.map(function(field) {
     var fieldVal;
     if (field == 'SERVER_VERSION_TIME') {
       var version = node['SERVER_VERSION'];
       fieldVal = versionToDateString(version);
     } if (field == 'BASE_VERSION_TIME') {
       var version = node['BASE_VERSION'];
       fieldVal = versionToDateString(version);
     } else if ((field == 'SERVER_SPECIFICS' || field == 'SPECIFICS') &&
             (!$('include-specifics').checked)) {
       fieldVal = 'REDACTED';
     } else if ((field == 'SERVER_SPECIFICS' || field == 'SPECIFICS') &&
             $('include-specifics').checked) {
       fieldVal = JSON.stringify(node[field]);
     } else {
       fieldVal = node[field];
     }
     return fieldVal;
   });
 }
 
-function isSelectedDatatype(node) {
-  var type = node.serverModelType;
+/**
+ * @param {string} type The name of a sync model type.
+ * @return {boolean} True if the type's checkbox is selected.
+ */
+function isSelectedDatatype(type) {
   var typeCheckbox = $(type);
   // Some types, such as 'Top level folder', appear in the list of nodes
   // but not in the list of selectable items.
   if (typeCheckbox == null) {
     return false;
   }
   return typeCheckbox.checked;
 }
 
 function makeBlobUrl(data) {
@@ skipping 15 matching lines @@
   return [name, 'csv'].join('.');
 }
 
 function makeDateUserAgentHeader() {
   var now = new Date();
   var userAgent = window.navigator.userAgent;
   var dateUaHeader = [now.toISOString(), userAgent].join(',');
   return dateUaHeader;
 }
 
-function triggerDataDownload(data) {
+/**
+ * Builds a summary of current state and exports it as a downloaded file.
+ *
+ * @param {!Array.<{type: string, nodes: !Array<!Object>}>} nodesMap
+ *     Summary of local state by model type.
+ */
+function triggerDataDownload(nodesMap) {
   // Prepend a header with ISO date and useragent.
   var output = [makeDateUserAgentHeader()];
   output.push('=====');
 
   var aboutInfo = JSON.stringify(chrome.sync.aboutInfo, null, 2);
   output.push(aboutInfo);
 
-  if (data != null && data.length > 0) {
+  // Filter out non-selected types.
+  var selectedTypesNodes = nodesMap.filter(function(x) {
+    return isSelectedDatatype(x.type);
+  });
+
+  // Serialize the remaining nodes and add them to the output.
+  selectedTypesNodes.forEach(function(typeNodes) {
     output.push('=====');
-    var fieldLabels = allFields.join(',');
-    output.push(fieldLabels);
+    output.push(typeNodes.nodes.map(serializeNode).join('\n'));
+  });
 
-    var data = data.filter(isSelectedDatatype);
-    data = data.map(getFields);
-    var dataAsString = data.join('\n');
-    output.push(dataAsString);
-  }
   output = output.join('\n');
 
   var anchor = $('dump-to-file-anchor');
   anchor.href = makeBlobUrl(output);
   anchor.download = makeDownloadName();
   anchor.click();
 }
 
 function createTypesCheckboxes(types) {
   var containerElt = $('node-type-checkboxes');
@@ skipping 31 matching lines @@
       'onReceivedListOfTypes',
       onReceivedListOfTypes);
   chrome.sync.requestListOfTypes();
 });
 
 var dumpToFileLink = $('dump-to-file');
 dumpToFileLink.addEventListener('click', function(event) {
   chrome.sync.getAllNodes(triggerDataDownload);
 });
 })();