Make debug log persistent

Save log entries in indexedDB rather than just in memory. Reload them
whenever the background page is refreshed.

// FREEBIE

background.html

@@ -311,9 +311,9 @@
       <div><button class='close'>{{ close }}</button></div>
     </div>
   </script>
-  <script type='text/javascript' src='js/debugLog.js'></script>
   <script type='text/javascript' src='js/components.js'></script>
   <script type='text/javascript' src='js/database.js'></script>
+  <script type='text/javascript' src='js/debugLog.js'></script>
   <script type='text/javascript' src='js/storage.js'></script>
   <script type='text/javascript' src='js/axolotl_store.js'></script>
   <script type='text/javascript' src='js/libtextsecure.js'></script>

js/background.js

@@ -4,6 +4,7 @@
 
 ;(function() {
     'use strict';
+    console.log('background page reloaded');
     // register some chrome listeners
     if (chrome.notifications) {
         chrome.notifications.onClicked.addListener(function() {

js/database.js

@@ -100,6 +100,12 @@
                 });
                 storage.fetch();
             }
+        },
+        {
+            version: "7.0",
+            migrate: function(transaction, next) {
+                transaction.db.createObjectStore("debug");
+            }
         }
     ];
 }());

js/debugLog.js

@@ -3,22 +3,58 @@
  */
 (function () {
     'use strict';
+
+    var LogEntry = Backbone.Model.extend({
+        database: Whisper.Database,
+        storeName: 'debug',
+        printTime: function() {
+            try {
+                return new Date(this.get('time')).toISOString();
+            } catch(e) {
+                return '';
+            }
+        },
+        printValue: function() {
+            return this.get('value') || '';
+        }
+    });
+
+    var DebugLog = Backbone.Collection.extend({
+        database: Whisper.Database,
+        storeName: 'debug',
+        model: LogEntry,
+        comparator: 'time',
+        initialize: function() {
+            this.fetch({remove: false});
+        },
+        log: function(str) {
+            this.add({time: Date.now(), value: str}).save();
+            if (this.length > MAX_MESSAGES) {
+                this.at(0).destroy();
+            }
+        },
+        print: function() {
+            return this.map(function(entry) {
+                return entry.printTime() + ' ' + entry.printValue();
+            }).join('\n');
+        }
+    });
+
     var MAX_MESSAGES = 1000;
     var PHONE_REGEX = /\+\d{7,12}(\d{3})/g;
-    var debugLog = [];
+    var log = new DebugLog();
     if (window.console) {
         console._log = console.log;
         console.log = function(){
             console._log.apply(this, arguments);
-            if (debugLog.length > MAX_MESSAGES) {
-                debugLog.shift();
-            }
             var args = Array.prototype.slice.call(arguments);
             var str = args.join(' ').replace(PHONE_REGEX, "+[REDACTED]$1");
-            debugLog.push(str);
+            log.log(str);
         };
         console.get = function() {
-            return window.navigator.userAgent + '\n' + debugLog.join('\n');
+            return window.navigator.userAgent +
+                ' Signal-Desktop/' + chrome.runtime.getManifest().version +
+                '\n' + log.print();
         };
         console.post = function(log) {
             if (log === undefined) {