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      1 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 /**
      6  * This view displays information on the host resolver:
      7  *
      8  *   - Shows the default address family.
      9  *   - Has a button to enable IPv6, if it is disabled.
     10  *   - Shows the current host cache contents.
     11  *   - Has a button to clear the host cache.
     12  *   - Shows the parameters used to construct the host cache (capacity, ttl).
     13  *
     14  *  @constructor
     15  */
     16 function DnsView(mainBoxId,
     17                  cacheTbodyId,
     18                  clearCacheButtonId,
     19                  defaultFamilySpanId,
     20                  ipv6DisabledSpanId,
     21                  enableIPv6ButtonId,
     22                  capacitySpanId,
     23                  ttlSuccessSpanId,
     24                  ttlFailureSpanId) {
     25   DivView.call(this, mainBoxId);
     26 
     27   // Hook up the UI components.
     28   this.cacheTbody_ = document.getElementById(cacheTbodyId);
     29   this.defaultFamilySpan_ = document.getElementById(defaultFamilySpanId);
     30   this.ipv6DisabledSpan_ = document.getElementById(ipv6DisabledSpanId);
     31 
     32   document.getElementById(enableIPv6ButtonId).onclick =
     33       g_browser.enableIPv6.bind(g_browser);
     34 
     35   this.capacitySpan_ = document.getElementById(capacitySpanId);
     36   this.ttlSuccessSpan_ = document.getElementById(ttlSuccessSpanId);
     37   this.ttlFailureSpan_ = document.getElementById(ttlFailureSpanId);
     38 
     39   var clearCacheButton = document.getElementById(clearCacheButtonId);
     40   clearCacheButton.onclick =
     41       g_browser.sendClearHostResolverCache.bind(g_browser);
     42 
     43   // Register to receive changes to the host resolver info.
     44   g_browser.addHostResolverInfoObserver(this);
     45 }
     46 
     47 inherits(DnsView, DivView);
     48 
     49 DnsView.prototype.onHostResolverInfoChanged = function(hostResolverInfo) {
     50   // Clear the existing values.
     51   this.defaultFamilySpan_.innerHTML = '';
     52   this.capacitySpan_.innerHTML = '';
     53   this.ttlSuccessSpan_.innerHTML = '';
     54   this.ttlFailureSpan_.innerHTML = '';
     55   this.cacheTbody_.innerHTML = '';
     56 
     57   // No info.
     58   if (!hostResolverInfo)
     59     return;
     60 
     61   var family = hostResolverInfo.default_address_family;
     62   addTextNode(this.defaultFamilySpan_, getKeyWithValue(AddressFamily, family));
     63 
     64   var ipv6Disabled = (family == AddressFamily.ADDRESS_FAMILY_IPV4);
     65   setNodeDisplay(this.ipv6DisabledSpan_, ipv6Disabled);
     66 
     67   // Fill in the basic cache information.
     68   var hostResolverCache = hostResolverInfo.cache;
     69   addTextNode(this.capacitySpan_, hostResolverCache.capacity);
     70   addTextNode(this.ttlSuccessSpan_, hostResolverCache.ttl_success_ms);
     71   addTextNode(this.ttlFailureSpan_, hostResolverCache.ttl_failure_ms);
     72 
     73   // Fill in the cache contents table.
     74   for (var i = 0; i < hostResolverCache.entries.length; ++i) {
     75     var e = hostResolverCache.entries[i];
     76     var tr = addNode(this.cacheTbody_, 'tr');
     77 
     78     var hostnameCell = addNode(tr, 'td');
     79     addTextNode(hostnameCell, e.hostname);
     80 
     81     var familyCell = addNode(tr, 'td');
     82     addTextNode(familyCell, getKeyWithValue(AddressFamily, e.address_family));
     83 
     84     var addressesCell = addNode(tr, 'td');
     85 
     86     if (e.error != undefined) {
     87       addTextNode(addressesCell, 'error: ' + e.error);
     88     } else {
     89       for (var j = 0; j < e.addresses.length; ++j) {
     90         var address = e.addresses[j];
     91         if (j != 0)
     92           addNode(addressesCell, 'br');
     93         addTextNode(addressesCell, address);
     94       }
     95     }
     96 
     97     var expiresDate = g_browser.convertTimeTicksToDate(e.expiration);
     98     var expiresCell = addNode(tr, 'td');
     99     addTextNode(expiresCell, expiresDate.toLocaleString());
    100   }
    101 };
    102