chrome/browser/resources/net_internals/source_tracker.js

   1 // Copyright (c) 2012 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 var SourceTracker = (function() {
   6   'use strict';
   7
   8   /**
   9    * This class keeps track of all NetLog events, grouped into per-source
  10    * streams. It receives events from EventsTracker, and passes
  11    * them on to all its observers.
  12    *
  13    * @constructor
  14    */
  15   function SourceTracker() {
  16     assertFirstConstructorCall(SourceTracker);
  17
  18     // Observers that only want to receive lists of updated SourceEntries.
  19     this.sourceEntryObservers_ = [];
  20
  21     // True when cookies and authentication information should be removed from
  22     // displayed events.  When true, such information should be hidden from
  23     // all pages.
  24     this.privacyStripping_ = true;
  25
  26     this.clearEntries_();
  27
  28     EventsTracker.getInstance().addLogEntryObserver(this);
  29   }
  30
  31   cr.addSingletonGetter(SourceTracker);
  32
  33   SourceTracker.prototype = {
  34     /**
  35      * Clears all log entries and SourceEntries and related state.
  36      */
  37     clearEntries_: function() {
  38       // Used for sorting entries with automatically assigned IDs.
  39       this.maxReceivedSourceId_ = 0;
  40
  41       // Next unique id to be assigned to a log entry without a source.
  42       // Needed to identify associated GUI elements, etc.
  43       this.nextSourcelessEventId_ = -1;
  44
  45       // Ordered list of log entries.  Needed to maintain original order when
  46       // generating log dumps
  47       this.capturedEvents_ = [];
  48
  49       this.sourceEntries_ = {};
  50     },
  51
  52     /**
  53      * Returns a list of all SourceEntries.
  54      */
  55     getAllSourceEntries: function() {
  56       return this.sourceEntries_;
  57     },
  58
  59     /**
  60      * Returns the description of the specified SourceEntry, or an empty string
  61      * if it doesn't exist.
  62      */
  63     getDescription: function(id) {
  64       var entry = this.getSourceEntry(id);
  65       if (entry)
  66         return entry.getDescription();
  67       return '';
  68     },
  69
  70     /**
  71      * Returns the specified SourceEntry.
  72      */
  73     getSourceEntry: function(id) {
  74       return this.sourceEntries_[id];
  75     },
  76
  77     /**
  78      * Sends each entry to all observers and updates |capturedEvents_|.
  79      * Also assigns unique ids to log entries without a source.
  80      */
  81     onReceivedLogEntries: function(logEntries) {
  82       // List source entries with new log entries.  Sorted chronologically, by
  83       // first new log entry.
  84       var updatedSourceEntries = [];
  85
  86       var updatedSourceEntryIdMap = {};
  87
  88       for (var e = 0; e < logEntries.length; ++e) {
  89         var logEntry = logEntries[e];
  90
  91         // Assign unique ID, if needed.
  92         // TODO(mmenke):  Remove this, and all other code to handle 0 source
  93         //                IDs when M19 hits stable.
  94         if (logEntry.source.id == 0) {
  95           logEntry.source.id = this.nextSourcelessEventId_;
  96           --this.nextSourcelessEventId_;
  97         } else if (this.maxReceivedSourceId_ < logEntry.source.id) {
  98           this.maxReceivedSourceId_ = logEntry.source.id;
  99         }
 100
 101         // Create/update SourceEntry object.
 102         var sourceEntry = this.sourceEntries_[logEntry.source.id];
 103         if (!sourceEntry) {
 104           sourceEntry = new SourceEntry(logEntry, this.maxReceivedSourceId_);
 105           this.sourceEntries_[logEntry.source.id] = sourceEntry;
 106         } else {
 107           sourceEntry.update(logEntry);
 108         }
 109
 110         // Add to updated SourceEntry list, if not already in it.
 111         if (!updatedSourceEntryIdMap[logEntry.source.id]) {
 112           updatedSourceEntryIdMap[logEntry.source.id] = sourceEntry;
 113           updatedSourceEntries.push(sourceEntry);
 114         }
 115       }
 116
 117       this.capturedEvents_ = this.capturedEvents_.concat(logEntries);
 118       for (var i = 0; i < this.sourceEntryObservers_.length; ++i) {
 119         this.sourceEntryObservers_[i].onSourceEntriesUpdated(
 120             updatedSourceEntries);
 121       }
 122     },
 123
 124     /**
 125      * Called when all log events have been deleted.
 126      */
 127     onAllLogEntriesDeleted: function() {
 128       this.clearEntries_();
 129       for (var i = 0; i < this.sourceEntryObservers_.length; ++i)
 130         this.sourceEntryObservers_[i].onAllSourceEntriesDeleted();
 131     },
 132
 133     /**
 134      * Sets the value of |privacyStripping_| and informs log observers
 135      * of the change.
 136      */
 137     setPrivacyStripping: function(privacyStripping) {
 138       this.privacyStripping_ = privacyStripping;
 139       for (var i = 0; i < this.sourceEntryObservers_.length; ++i) {
 140         if (this.sourceEntryObservers_[i].onPrivacyStrippingChanged)
 141           this.sourceEntryObservers_[i].onPrivacyStrippingChanged();
 142       }
 143     },
 144
 145     /**
 146      * Returns whether or not cookies and authentication information should be
 147      * displayed for events that contain them.
 148      */
 149     getPrivacyStripping: function() {
 150       return this.privacyStripping_;
 151     },
 152
 153     /**
 154      * Adds a listener of SourceEntries. |observer| will be called back when
 155      * SourceEntries are added or modified, source entries are deleted, or
 156      * privacy stripping changes:
 157      *
 158      *   observer.onSourceEntriesUpdated(sourceEntries)
 159      *   observer.onAllSourceEntriesDeleted()
 160      *   observer.onPrivacyStrippingChanged()
 161      */
 162     addSourceEntryObserver: function(observer) {
 163       this.sourceEntryObservers_.push(observer);
 164     }
 165   };
 166
 167   return SourceTracker;
 168 })();