Add the host resolver cache to the new net internals page.

chrome/browser/resources/net_internals/main.js

 // Copyright (c) 2010 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.
 
 /**
  * Dictionary of constants (initialized by browser).
  */
 var LogEntryType = null;
 var LogEventType = null;
 var LogEventPhase = null;
@@ skipping 32 matching lines @@
                                       "actionBox",
                                       "splitterBox");
 
   // Create a view which will display info on the proxy setup.
   var proxyView = new ProxyView("proxyTabContent",
                                 "proxyCurrentConfig",
                                 "proxyReloadSettings",
                                 "badProxiesTableBody",
                                 "clearBadProxies");
 
+  // Create a view which will display information on the host resolver.
+  var dnsView = new DnsView("dnsTabContent",
+                            "hostResolverCacheTbody",
+                            "clearHostResolverCache",
+                            "hostResolverCacheCapacity",
+                            "hostResolverCacheTTLSuccess",
+                            "hostResolverCacheTTLFailure");
+
   // Create a view which lets you tab between the different sub-views.
   var categoryTabSwitcher =
       new TabSwitcherView(new DivView('categoryTabHandles'));
 
   // Populate the main tabs.
   categoryTabSwitcher.addTab('requestsTab', requestsView, false);
   categoryTabSwitcher.addTab('proxyTab', proxyView, false);
-  categoryTabSwitcher.addTab('dnsTab', new DivView('dnsTabContent'), false);
+  categoryTabSwitcher.addTab('dnsTab', dnsView, false);
   categoryTabSwitcher.addTab('socketsTab', new DivView('socketsTabContent'),
                              false);
   categoryTabSwitcher.addTab('httpCacheTab',
                              new DivView('httpCacheTabContent'), false);
 
   // Build a map from the anchor name of each tab handle to its "tab ID".
   // We will consider navigations to the #hash as a switch tab request.
   var anchorMap = {};
   var tabIds = categoryTabSwitcher.getAllTabIds();
   for (var i = 0; i < tabIds.length; ++i) {
@@ skipping 26 matching lines @@
  * This class provides a "bridge" for communicating between the javascript and
  * the browser.
  *
  * @constructor
  */
 function BrowserBridge() {
   // List of observers for various bits of browser state.
   this.logObservers_ = [];
   this.proxySettingsObservers_ = [];
   this.badProxiesObservers_ = [];
+  this.hostResolverCacheObservers_ = [];
 
-  // Map from observer method name (i.e. 'onProxySettingsChanged', 'onBadProxiesChanged')
-  // to the previously received data for that type. Used to tell if the data has
-  // actually changed since we last polled it.
+  // Map from observer method name (i.e. 'onProxySettingsChanged',
+  // 'onBadProxiesChanged') to the previously received data for that type. Used
+  // to tell if the data has actually changed since we last polled it.
   this.prevPollData_ = {};
 }
 
 /**
  * Delay in milliseconds between polling of certain browser information.
  */
 BrowserBridge.POLL_INTERVAL_MS = 5000;
 
 //------------------------------------------------------------------------------
 // Messages sent to the browser
@@ skipping 16 matching lines @@
 
 BrowserBridge.prototype.sendReloadProxySettings = function() {
   chrome.send('reloadProxySettings');
 };
 
 BrowserBridge.prototype.sendGetBadProxies = function() {
   // The browser will call receivedBadProxies on completion.
   chrome.send('getBadProxies');
 };
 
+BrowserBridge.prototype.sendGetHostResolverCache = function() {
+  // The browser will call receivedHostResolverCache on completion.
+  chrome.send('getHostResolverCache');
+};
+
 BrowserBridge.prototype.sendClearBadProxies = function() {
   chrome.send('clearBadProxies');
 };
 
+BrowserBridge.prototype.sendClearHostResolverCache = function() {
+  chrome.send('clearHostResolverCache');
+};
+
 //------------------------------------------------------------------------------
 // Messages received from the browser
 //------------------------------------------------------------------------------
 
 BrowserBridge.prototype.receivedLogEntry = function(logEntry) {
   for (var i = 0; i < this.logObservers_.length; ++i)
     this.logObservers_[i].onLogEntryAdded(logEntry);
 };
 
 BrowserBridge.prototype.receivedLogEventTypeConstants = function(constantsMap) {
   LogEventType = constantsMap;
 };
 
-BrowserBridge.prototype.receivedLogEventPhaseConstants = function(constantsMap) {
+BrowserBridge.prototype.receivedLogEventPhaseConstants =
+function(constantsMap) {
   LogEventPhase = constantsMap;
 };
 
-BrowserBridge.prototype.receivedLogSourceTypeConstants = function(constantsMap) {
+BrowserBridge.prototype.receivedLogSourceTypeConstants =
+function(constantsMap) {
   LogSourceType = constantsMap;
 };
 
 BrowserBridge.prototype.receivedLogEntryTypeConstants = function(constantsMap) {
   LogEntryType = constantsMap;
 };
 
 BrowserBridge.prototype.receivedTimeTickOffset = function(timeTickOffset) {
   this.timeTickOffset_ = timeTickOffset;
 };
 
 BrowserBridge.prototype.receivedProxySettings = function(proxySettings) {
   this.dispatchToObserversFromPoll_(
       this.proxySettingsObservers_, 'onProxySettingsChanged', proxySettings);
 };
 
 BrowserBridge.prototype.receivedBadProxies = function(badProxies) {
   this.dispatchToObserversFromPoll_(
       this.badProxiesObservers_, 'onBadProxiesChanged', badProxies);
 };
 
+BrowserBridge.prototype.receivedHostResolverCache =
+function(hostResolverCache) {
+  this.dispatchToObserversFromPoll_(
+      this.hostResolverCacheObservers_, 'onHostResolverCacheChanged',
+      hostResolverCache);
+};
+
 //------------------------------------------------------------------------------
 
 /**
  * Adds a listener of log entries. |observer| will be called back when new log
  * data arrives, through:
  *
  *   observer.onLogEntryAdded(logEntry)
  */
 BrowserBridge.prototype.addLogObserver = function(observer) {
   this.logObservers_.push(observer);
@@ skipping 21 matching lines @@
  * |badProxies| is an array, where each entry has the property:
  *   badProxies[i].proxy_uri: String identify the proxy.
  *   badProxies[i].bad_until: The time when the proxy stops being considered
  *                            bad. Note the time is in time ticks.
  */
 BrowserBridge.prototype.addBadProxiesObsever = function(observer) {
   this.badProxiesObservers_.push(observer);
 };
 
 /**
+ * Adds a listener of the host resolver cache. |observer| will be called back
+ * when data is received, through:
+ *
+ *   observer.onHostResolverCacheChanged(hostResolverCache)
+ */
+BrowserBridge.prototype.addHostResolverCacheObserver = function(observer) {
+  this.hostResolverCacheObservers_.push(observer);
+};
+
+/**
  * The browser gives us times in terms of "time ticks" in milliseconds.
  * This function converts the tick count to a Date() object.
  *
  * @param {String} timeTicks.
  * @returns {Date} The time that |timeTicks| represents.
  */
 BrowserBridge.prototype.convertTimeTicksToDate = function(timeTicks) {
   // Note that the subtraction by 0 is to cast to a number (probably a float
   // since the numbers are big).
   var timeStampMs = (this.timeTickOffset_ - 0) + (timeTicks - 0);
   var d = new Date();
   d.setTime(timeStampMs);
   return d;
 };
 
 BrowserBridge.prototype.doPolling_ = function() {
+  // TODO(eroman): Optimize this by using a separate polling frequency for the
+  // data consumed by the currently active view. Everything else can be on a low
+  // frequency poll since it won't impact the display.
   this.sendGetProxySettings();
   this.sendGetBadProxies();
+  this.sendGetHostResolverCache();
 };
 
 /**
  * Helper function to handle calling all the observers, but ONLY if the data has
  * actually changed since last time. This is used for data we received from
  * browser on a poll loop.
  */
 BrowserBridge.prototype.dispatchToObserversFromPoll_ = function(
     observerList, method, data) {
   var prevData = this.prevPollData_[method];
 
   // If the data hasn't changed since last time, no need to notify observers.
   if (prevData && JSON.stringify(prevData) == JSON.stringify(data))
     return;
 
   this.prevPollData_[method] = data;
 
   // Ok, notify the observers of the change.
   for (var i = 0; i < observerList.length; ++i)
     observerList[i][method](data);
 };