[polymer] Merge of master into polymer10-migration

netlog_viewer/dns_view.js

Index: netlog_viewer/dns_view.js
diff --git a/netlog_viewer/dns_view.js b/netlog_viewer/dns_view.js
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+// 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.
+
+/**
+ * This view displays information on the host resolver:
+ *
+ *   - Shows the default address family.
+ *   - Shows the current host cache contents.
+ *   - Has a button to clear the host cache.
+ *   - Shows the parameters used to construct the host cache (capacity, ttl).
+ */
+
+// TODO(mmenke):  Add links for each address entry to the corresponding NetLog
+//                source.  This could either be done by adding NetLog source ids
+//                to cache entries, or tracking sources based on their type and
+//                description.  Former is simpler, latter may be useful
+//                elsewhere as well.
+var DnsView = (function() {
+  'use strict';
+
+  // We inherit from DivView.
+  var superClass = DivView;
+
+  /**
+   *  @constructor
+   */
+  function DnsView() {
+    assertFirstConstructorCall(DnsView);
+
+    // Call superclass's constructor.
+    superClass.call(this, DnsView.MAIN_BOX_ID);
+
+    $(DnsView.CLEAR_CACHE_BUTTON_ID).onclick =
+        g_browser.sendClearHostResolverCache.bind(g_browser);
+
+    // Register to receive changes to the host resolver info.
+    g_browser.addHostResolverInfoObserver(this, false);
+  }
+
+  DnsView.TAB_ID = 'tab-handle-dns';
+  DnsView.TAB_NAME = 'DNS';
+  DnsView.TAB_HASH = '#dns';
+
+  // IDs for special HTML elements in dns_view.html
+  DnsView.MAIN_BOX_ID = 'dns-view-tab-content';
+
+  DnsView.INTERNAL_DNS_ENABLED_SPAN_ID = 'dns-view-internal-dns-enabled';
+  DnsView.INTERNAL_DNS_INVALID_CONFIG_SPAN_ID =
+      'dns-view-internal-dns-invalid-config';
+  DnsView.INTERNAL_DNS_CONFIG_TBODY_ID = 'dns-view-internal-dns-config-tbody';
+
+  DnsView.CLEAR_CACHE_BUTTON_ID = 'dns-view-clear-cache';
+  DnsView.CAPACITY_SPAN_ID = 'dns-view-cache-capacity';
+
+  DnsView.ACTIVE_SPAN_ID = 'dns-view-cache-active';
+  DnsView.EXPIRED_SPAN_ID = 'dns-view-cache-expired';
+  DnsView.CACHE_TBODY_ID = 'dns-view-cache-tbody';
+
+  cr.addSingletonGetter(DnsView);
+
+  DnsView.prototype = {
+    // Inherit the superclass's methods.
+    __proto__: superClass.prototype,
+
+    onLoadLogFinish: function(data) {
+      return this.onHostResolverInfoChanged(data.hostResolverInfo);
+    },
+
+    onHostResolverInfoChanged: function(hostResolverInfo) {
+      // Clear the existing values.
+      $(DnsView.CAPACITY_SPAN_ID).innerHTML = '';
+      $(DnsView.CACHE_TBODY_ID).innerHTML = '';
+      $(DnsView.ACTIVE_SPAN_ID).innerHTML = '0';
+      $(DnsView.EXPIRED_SPAN_ID).innerHTML = '0';
+
+      // Update fields containing async DNS configuration information.
+      displayAsyncDnsConfig_(hostResolverInfo);
+
+      // No info.
+      if (!hostResolverInfo || !hostResolverInfo.cache)
+        return false;
+
+      // Fill in the basic cache information.
+      var hostResolverCache = hostResolverInfo.cache;
+      $(DnsView.CAPACITY_SPAN_ID).innerText = hostResolverCache.capacity;
+
+      var expiredEntries = 0;
+      // Date the cache was logged.  This will be either now, when actively
+      // logging data, or the date the log dump was created.
+      var logDate;
+      if (MainView.isViewingLoadedLog()) {
+        logDate = new Date(ClientInfo.numericDate);
+      } else {
+        logDate = new Date();
+      }
+
+      // Fill in the cache contents table.
+      for (var i = 0; i < hostResolverCache.entries.length; ++i) {
+        var e = hostResolverCache.entries[i];
+        var tr = addNode($(DnsView.CACHE_TBODY_ID), 'tr');
+
+        var hostnameCell = addNode(tr, 'td');
+        addTextNode(hostnameCell, e.hostname);
+
+        var familyCell = addNode(tr, 'td');
+        addTextNode(familyCell,
+                    addressFamilyToString(e.address_family));
+
+        var addressesCell = addNode(tr, 'td');
+
+        if (e.error != undefined) {
+          var errorText =
+              e.error + ' (' + netErrorToString(e.error) + ')';
+          var errorNode = addTextNode(addressesCell, 'error: ' + errorText);
+          addressesCell.classList.add('warning-text');
+        } else {
+          addListToNode_(addNode(addressesCell, 'div'), e.addresses);
+        }
+
+        var expiresDate = timeutil.convertTimeTicksToDate(e.expiration);
+        var expiresCell = addNode(tr, 'td');
+        timeutil.addNodeWithDate(expiresCell, expiresDate);
+        if (logDate > timeutil.convertTimeTicksToDate(e.expiration)) {
+          ++expiredEntries;
+          var expiredSpan = addNode(expiresCell, 'span');
+          expiredSpan.classList.add('warning-text');
+          addTextNode(expiredSpan, ' [Expired]');
+        }
+      }
+
+      $(DnsView.ACTIVE_SPAN_ID).innerText =
+          hostResolverCache.entries.length - expiredEntries;
+      $(DnsView.EXPIRED_SPAN_ID).innerText = expiredEntries;
+      return true;
+    },
+  };
+
+  /**
+   * Displays information corresponding to the current async DNS configuration.
+   * @param {Object} hostResolverInfo The host resolver information.
+   */
+  function displayAsyncDnsConfig_(hostResolverInfo) {
+    // Clear the table.
+    $(DnsView.INTERNAL_DNS_CONFIG_TBODY_ID).innerHTML = '';
+
+    // Figure out if the internal DNS resolver is disabled or has no valid
+    // configuration information, and update display accordingly.
+    var enabled = hostResolverInfo &&
+                  hostResolverInfo.dns_config !== undefined;
+    var noConfig = enabled &&
+                   hostResolverInfo.dns_config.nameservers === undefined;
+    $(DnsView.INTERNAL_DNS_ENABLED_SPAN_ID).innerText = enabled;
+    setNodeDisplay($(DnsView.INTERNAL_DNS_INVALID_CONFIG_SPAN_ID), noConfig);
+
+    // If the internal DNS resolver is disabled or has no valid configuration,
+    // we're done.
+    if (!enabled || noConfig)
+      return;
+
+    var dnsConfig = hostResolverInfo.dns_config;
+
+    // Display nameservers first.
+    var nameserverRow = addNode($(DnsView.INTERNAL_DNS_CONFIG_TBODY_ID), 'tr');
+    addNodeWithText(nameserverRow, 'th', 'nameservers');
+    addListToNode_(addNode(nameserverRow, 'td'), dnsConfig.nameservers);
+
+    // Add everything else in |dnsConfig| to the table.
+    for (var key in dnsConfig) {
+      if (key == 'nameservers')
+        continue;
+      var tr = addNode($(DnsView.INTERNAL_DNS_CONFIG_TBODY_ID), 'tr');
+      addNodeWithText(tr, 'th', key);
+      var td = addNode(tr, 'td');
+
+      // For lists, display each list entry on a separate line.
+      if (typeof dnsConfig[key] == 'object' &&
+          dnsConfig[key].constructor == Array) {
+        addListToNode_(td, dnsConfig[key]);
+        continue;
+      }
+
+      addTextNode(td, dnsConfig[key]);
+    }
+  }
+
+  /**
+   * Takes a last of strings and adds them all to a DOM node, displaying them
+   * on separate lines.
+   * @param {DomNode} node The parent node.
+   * @param {Array<string>} list List of strings to add to the node.
+   */
+  function addListToNode_(node, list) {
+    for (var i = 0; i < list.length; ++i)
+      addNodeWithText(node, 'div', list[i]);
+  }
+
+  return DnsView;
+})();
+