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693 lines
22 KiB
JavaScript
693 lines
22 KiB
JavaScript
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Firefox Sync.
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*
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* The Initial Developer of the Original Code is
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* the Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2011
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Gregory Szorc <gps@mozilla.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/**
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* This file contains middleware to reconcile state of AddonManager for
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* purposes of tracking events for Sync. The content in this file exists
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* because AddonManager does not have a getChangesSinceX() API and adding
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* that functionality properly was deemed too time-consuming at the time
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* add-on sync was originally written. If/when AddonManager adds this API,
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* this file can go away and the add-ons engine can be rewritten to use it.
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*
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* It was decided to have this tracking functionality exist in a separate
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* standalone file so it could be more easily understood, tested, and
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* hopefully ported.
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*/
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"use strict";
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const Cu = Components.utils;
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Cu.import("resource://services-sync/log4moz.js");
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Cu.import("resource://services-sync/engines.js");
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Cu.import("resource://services-sync/util.js");
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Cu.import("resource://gre/modules/AddonManager.jsm");
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const DEFAULT_STATE_FILE = "addonsreconciler";
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const CHANGE_INSTALLED = 1;
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const CHANGE_UNINSTALLED = 2;
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const CHANGE_ENABLED = 3;
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const CHANGE_DISABLED = 4;
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const EXPORTED_SYMBOLS = ["AddonsReconciler", "CHANGE_INSTALLED",
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"CHANGE_UNINSTALLED", "CHANGE_ENABLED",
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"CHANGE_DISABLED"];
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/**
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* Maintains state of add-ons.
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*
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* State is maintained in 2 data structures, an object mapping add-on IDs
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* to metadata and an array of changes over time. The object mapping can be
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* thought of as a minimal copy of data from AddonManager which is needed for
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* Sync. The array is effectively a log of changes over time.
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*
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* The data structures are persisted to disk by serializing to a JSON file in
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* the current profile. The data structures are updated by 2 mechanisms. First,
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* they can be refreshed from the global state of the AddonManager. This is a
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* sure-fire way of ensuring the reconciler is up to date. Second, the
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* reconciler adds itself as an AddonManager listener. When it receives change
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* notifications, it updates its internal state incrementally.
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*
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* The internal state is persisted to a JSON file in the profile directory.
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*
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* An instance of this is bound to an AddonsEngine instance. In reality, it
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* likely exists as a singleton. To AddonsEngine, it functions as a store and
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* an entity which emits events for tracking.
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*
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* The usage pattern for instances of this class is:
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*
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* let reconciler = new AddonsReconciler();
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* reconciler.loadState(null, function(error) { ... });
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*
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* // At this point, your instance should be ready to use.
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*
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* When you are finished with the instance, please call:
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*
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* reconciler.stopListening();
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* reconciler.saveStateFile(...);
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*
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*
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* There are 2 classes of listeners in the AddonManager: AddonListener and
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* InstallListener. This class is a listener for both (member functions just
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* get called directly).
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*
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* When an add-on is installed, listeners are called in the following order:
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*
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* IL.onInstallStarted, AL.onInstalling, IL.onInstallEnded, AL.onInstalled
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*
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* For non-restartless add-ons, an application restart may occur between
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* IL.onInstallEnded and AL.onInstalled. Unfortunately, Sync likely will
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* not be loaded when AL.onInstalled is fired shortly after application
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* start, so it won't see this event. Therefore, for add-ons requiring a
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* restart, Sync treats the IL.onInstallEnded event as good enough to
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* indicate an install. For restartless add-ons, Sync assumes AL.onInstalled
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* will follow shortly after IL.onInstallEnded and thus it ignores
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* IL.onInstallEnded.
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*
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* The listeners can also see events related to the download of the add-on.
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* This class isn't interested in those. However, there are failure events,
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* IL.onDownloadFailed and IL.onDownloadCanceled which get called if a
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* download doesn't complete successfully.
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*
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* For uninstalls, we see AL.onUninstalling then AL.onUninstalled. Like
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* installs, the events could be separated by an application restart and Sync
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* may not see the onUninstalled event. Again, if we require a restart, we
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* react to onUninstalling. If not, we assume we'll get onUninstalled.
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*
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* Enabling and disabling work by sending:
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*
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* AL.onEnabling, AL.onEnabled
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* AL.onDisabling, AL.onDisabled
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*
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* Again, they may be separated by a restart, so we heed the requiresRestart
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* flag.
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*
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* Actions can be undone. All undoable actions notify the same
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* AL.onOperationCancelled event. We treat this event like any other.
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*
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* Restartless add-ons have interesting behavior during uninstall. These
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* add-ons are first disabled then they are actually uninstalled. So, we will
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* see AL.onDisabling and AL.onDisabled. The onUninstalling and onUninstalled
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* events only come after the Addon Manager is closed or another view is
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* switched to. In the case of Sync performing the uninstall, the uninstall
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* events will occur immediately. However, we still see disabling events and
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* heed them like they were normal. In the end, the state is proper.
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*/
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function AddonsReconciler() {
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this._log = Log4Moz.repository.getLogger("Sync.AddonsReconciler");
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let level = Svc.Prefs.get("log.logger.addonsreconciler", "Debug");
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this._log.level = Log4Moz.Level[level];
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Svc.Obs.add("weave:engine:start-tracking", this.startListening, this);
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Svc.Obs.add("weave:engine:stop-tracking", this.stopListening, this);
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Svc.Obs.add("xpcom-shutdown", this.stopListening, this);
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};
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AddonsReconciler.prototype = {
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/** Flag indicating whether we are listening to AddonManager events. */
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_listening: false,
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/** Whether state has been loaded from a file.
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*
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* State is loaded on demand if an operation requires it.
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*/
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_stateLoaded: false,
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/** log4moz logger instance */
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_log: null,
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/**
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* Container for add-on metadata.
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*
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* Keys are add-on IDs. Values are objects which describe the state of the
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* add-on. This is a minimal mirror of data that can be queried from
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* AddonManager. In some cases, we retain data longer than AddonManager.
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*/
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_addons: {},
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/**
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* List of add-on changes over time.
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*
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* Each element is an array of [time, change, id].
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*/
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_changes: [],
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/**
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* Objects subscribed to changes made to this instance.
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*/
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_listeners: [],
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/**
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* Accessor for add-ons in this object.
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*
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* Returns an object mapping add-on IDs to objects containing metadata.
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*/
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get addons() {
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this._ensureStateLoaded();
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return this._addons;
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},
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/**
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* Load reconciler state from a file.
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*
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* The path is relative to the weave directory in the profile. If no
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* path is given, the default one is used.
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*
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* If the file does not exist or there was an error parsing the file, the
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* state will be transparently defined as empty.
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*
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* @param path
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* Path to load. ".json" is appended automatically. If not defined,
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* a default path will be consulted.
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* @param callback
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* Callback to be executed upon file load. The callback receives a
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* truthy error argument signifying whether an error occurred and a
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* boolean indicating whether data was loaded.
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*/
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loadState: function loadState(path, callback) {
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let file = path || DEFAULT_STATE_FILE;
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Utils.jsonLoad(file, this, function(json) {
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this._addons = {};
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this._changes = [];
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if (!json) {
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this._log.debug("No data seen in loaded file: " + file);
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if (callback) {
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callback(null, false);
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}
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return;
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}
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let version = json.version;
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if (!version || version != 1) {
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this._log.error("Could not load JSON file because version not " +
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"supported: " + version);
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if (callback) {
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callback(null, false);
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}
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return;
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}
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this._addons = json.addons;
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for each (let record in this._addons) {
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record.modified = new Date(record.modified);
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}
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for each (let [time, change, id] in json.changes) {
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this._changes.push([new Date(time), change, id]);
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}
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if (callback) {
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callback(null, true);
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}
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});
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},
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/**
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* Saves the current state to a file in the local profile.
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*
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* @param path
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* String path in profile to save to. If not defined, the default
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* will be used.
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* @param callback
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* Function to be invoked on save completion. No parameters will be
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* passed to callback.
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*/
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saveState: function saveState(path, callback) {
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let file = path || DEFAULT_STATE_FILE;
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let state = {version: 1, addons: {}, changes: []};
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for (let [id, record] in Iterator(this._addons)) {
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state.addons[id] = {};
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for (let [k, v] in Iterator(record)) {
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if (k == "modified") {
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state.addons[id][k] = v.getTime();
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}
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else {
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state.addons[id][k] = v;
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}
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}
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}
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for each (let [time, change, id] in this._changes) {
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state.changes.push([time.getTime(), change, id]);
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}
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this._log.info("Saving reconciler state to file: " + file);
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Utils.jsonSave(file, this, state, callback);
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},
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/**
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* Registers a change listener with this instance.
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*
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* Change listeners are called every time a change is recorded. The listener
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* is an object with the function "changeListener" that takes 3 arguments,
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* the Date at which the change happened, the type of change (a CHANGE_*
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* constant), and the add-on state object reflecting the current state of
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* the add-on at the time of the change.
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*
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* @param listener
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* Object containing changeListener function.
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*/
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addChangeListener: function addChangeListener(listener) {
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if (this._listeners.indexOf(listener) == -1) {
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this._log.debug("Adding change listener.");
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this._listeners.push(listener);
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}
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},
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/**
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* Removes a previously-installed change listener from the instance.
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*
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* @param listener
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* Listener instance to remove.
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*/
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removeChangeListener: function removeChangeListener(listener) {
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this._listeners = this._listeners.filter(function(element) {
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if (element == listener) {
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this._log.debug("Removing change listener.");
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return false;
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} else {
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return true;
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}
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}.bind(this));
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},
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/**
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* Tells the instance to start listening for AddonManager changes.
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*
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* This is typically called automatically when Sync is loaded.
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*/
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startListening: function startListening() {
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let engine = Engines.get("addons");
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if (!engine || !engine.enabled || this._listening) {
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return;
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}
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this._log.info("Registering as Add-on Manager listener.");
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AddonManager.addAddonListener(this);
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AddonManager.addInstallListener(this);
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this._listening = true;
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},
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/**
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* Tells the instance to stop listening for AddonManager changes.
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*
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* The reconciler should always be listening. This should only be called when
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* the instance is being destroyed.
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*
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* This function will get called automatically on XPCOM shutdown. However, it
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* is a best practice to call it yourself.
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*/
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stopListening: function stopListening() {
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if (!this._listening) {
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return;
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}
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this._log.debug("Stopping listening and removing AddonManager listeners.");
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AddonManager.removeInstallListener(this);
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AddonManager.removeAddonListener(this);
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this._listening = false;
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},
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/**
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* Refreshes the global state of add-ons by querying the AddonManager.
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*/
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refreshGlobalState: function refreshGlobalState(callback) {
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this._log.info("Refreshing global state from AddonManager.");
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this._ensureStateLoaded();
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let installs;
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AddonManager.getAllAddons(function (addons) {
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let ids = {};
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for each (let addon in addons) {
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ids[addon.id] = true;
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this.rectifyStateFromAddon(addon);
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}
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// Look for locally-defined add-ons that no longer exist and update their
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// record.
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for (let [id, addon] in Iterator(this._addons)) {
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if (id in ids) {
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continue;
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}
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// If the id isn't in ids, it means that the add-on has been deleted or
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// the add-on is in the process of being installed. We detect the
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// latter by seeing if an AddonInstall is found for this add-on.
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if (!installs) {
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let cb = Async.makeSyncCallback();
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AddonManager.getAllInstalls(cb);
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installs = Async.waitForSyncCallback(cb);
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}
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let installFound = false;
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for each (let install in installs) {
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if (install.addon && install.addon.id == id &&
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install.state == AddonManager.STATE_INSTALLED) {
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installFound = true;
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break;
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}
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}
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if (installFound) {
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continue;
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}
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if (addon.installed) {
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addon.installed = false;
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this._log.debug("Adding change because add-on not present in " +
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"Add-on Manager: " + id);
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this._addChange(new Date(), CHANGE_UNINSTALLED, addon);
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}
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}
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this.saveState(null, callback);
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}.bind(this));
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},
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/**
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* Rectifies the state of an add-on from an Addon instance.
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*
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* This basically says "given an Addon instance, assume it is truth and
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* apply changes to the local state to reflect it."
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*
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* This function could result in change listeners being called if the local
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* state differs from the passed add-on's state.
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*
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* @param addon
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* Addon instance being updated.
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*/
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rectifyStateFromAddon: function rectifyStateFromAddon(addon) {
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this._log.debug("Rectifying state for addon: " + addon.id);
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this._ensureStateLoaded();
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let id = addon.id;
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let enabled = !addon.userDisabled;
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let guid = addon.syncGUID;
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let now = new Date();
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if (!(id in this._addons)) {
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let record = {
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id: id,
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guid: guid,
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enabled: enabled,
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installed: true,
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modified: now,
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type: addon.type,
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scope: addon.scope,
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foreignInstall: addon.foreignInstall
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};
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this._addons[id] = record;
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this._log.debug("Adding change because add-on not present locally: " +
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id);
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this._addChange(now, CHANGE_INSTALLED, record);
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return;
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}
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let record = this._addons[id];
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if (!record.installed) {
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// It is possible the record is marked as uninstalled because an
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// uninstall is pending.
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if (!(addon.pendingOperations & AddonManager.PENDING_UNINSTALL)) {
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record.installed = true;
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record.modified = now;
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}
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}
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if (record.enabled != enabled) {
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record.enabled = enabled;
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record.modified = now;
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let change = enabled ? CHANGE_ENABLED : CHANGE_DISABLED;
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this._log.debug("Adding change because enabled state changed: " + id);
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this._addChange(new Date(), change, record);
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}
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if (record.guid != guid) {
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record.guid = guid;
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// We don't record a change because the Sync engine rectifies this on its
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// own. This is tightly coupled with Sync. If this code is ever lifted
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// outside of Sync, this exception should likely be removed.
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}
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},
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/**
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* Record a change in add-on state.
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*
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* @param date
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* Date at which the change occurred.
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* @param change
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* The type of the change. A CHANGE_* constant.
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* @param state
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* The new state of the add-on. From this.addons.
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*/
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_addChange: function _addChange(date, change, state) {
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this._log.info("Change recorded for " + state.id);
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this._changes.push([date, change, state.id]);
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for each (let listener in this._listeners) {
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try {
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listener.changeListener.call(listener, date, change, state);
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} catch (ex) {
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this._log.warn("Exception calling change listener: " +
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Utils.exceptionStr(ex));
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}
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}
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},
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|
|
/**
|
|
* Obtain the set of changes to add-ons since the date passed.
|
|
*
|
|
* This will return an array of arrays. Each entry in the array has the
|
|
* elements [date, change_type, id], where
|
|
*
|
|
* date - Date instance representing when the change occurred.
|
|
* change_type - One of CHANGE_* constants.
|
|
* id - ID of add-on that changed.
|
|
*/
|
|
getChangesSinceDate: function getChangesSinceDate(date) {
|
|
this._ensureStateLoaded();
|
|
|
|
let length = this._changes.length;
|
|
for (let i = 0; i < length; i++) {
|
|
if (this._changes[i][0] >= date) {
|
|
return this._changes.slice(i);
|
|
}
|
|
}
|
|
|
|
return [];
|
|
},
|
|
|
|
/**
|
|
* Prunes all recorded changes from before the specified Date.
|
|
*
|
|
* @param date
|
|
* Entries older than this Date will be removed.
|
|
*/
|
|
pruneChangesBeforeDate: function pruneChangesBeforeDate(date) {
|
|
this._ensureStateLoaded();
|
|
|
|
this._changes = this._changes.filter(function test_age(change) {
|
|
return change[0] >= date;
|
|
});
|
|
},
|
|
|
|
/**
|
|
* Obtains the set of all known Sync GUIDs for add-ons.
|
|
*
|
|
* @return Object with guids as keys and values of true.
|
|
*/
|
|
getAllSyncGUIDs: function getAllSyncGUIDs() {
|
|
let result = {};
|
|
for (let id in this.addons) {
|
|
result[id] = true;
|
|
}
|
|
|
|
return result;
|
|
},
|
|
|
|
/**
|
|
* Obtain the add-on state record for an add-on by Sync GUID.
|
|
*
|
|
* If the add-on could not be found, returns null.
|
|
*
|
|
* @param guid
|
|
* Sync GUID of add-on to retrieve.
|
|
* @return Object on success on null on failure.
|
|
*/
|
|
getAddonStateFromSyncGUID: function getAddonStateFromSyncGUID(guid) {
|
|
for each (let addon in this.addons) {
|
|
if (addon.guid == guid) {
|
|
return addon;
|
|
}
|
|
}
|
|
|
|
return null;
|
|
},
|
|
|
|
/**
|
|
* Ensures that state is loaded before continuing.
|
|
*
|
|
* This is called internally by anything that accesses the internal data
|
|
* structures. It effectively just-in-time loads serialized state.
|
|
*/
|
|
_ensureStateLoaded: function _ensureStateLoaded() {
|
|
if (this._stateLoaded) {
|
|
return;
|
|
}
|
|
|
|
let cb = Async.makeSpinningCallback();
|
|
this.loadState(null, cb);
|
|
cb.wait();
|
|
this._stateLoaded = true;
|
|
},
|
|
|
|
/**
|
|
* Handler that is invoked as part of the AddonManager listeners.
|
|
*/
|
|
_handleListener: function _handlerListener(action, addon, requiresRestart) {
|
|
// Since this is called as an observer, we explicitly trap errors and
|
|
// log them to ourselves so we don't see errors reported elsewhere.
|
|
try {
|
|
let id = addon.id;
|
|
this._log.debug("Add-on change: " + action + " to " + id);
|
|
|
|
// We assume that every event for non-restartless add-ons is
|
|
// followed by another event and that this follow-up event is the most
|
|
// appropriate to react to. Currently we ignore onEnabling, onDisabling,
|
|
// and onUninstalling for non-restartless add-ons.
|
|
if (requiresRestart === false) {
|
|
this._log.debug("Ignoring " + action + " for restartless add-on.");
|
|
return;
|
|
}
|
|
|
|
switch (action) {
|
|
case "onEnabling":
|
|
case "onEnabled":
|
|
case "onDisabling":
|
|
case "onDisabled":
|
|
case "onInstalled":
|
|
case "onInstallEnded":
|
|
case "onOperationCancelled":
|
|
this.rectifyStateFromAddon(addon);
|
|
break;
|
|
|
|
case "onUninstalling":
|
|
case "onUninstalled":
|
|
let id = addon.id;
|
|
let addons = this.addons;
|
|
if (id in addons) {
|
|
let now = new Date();
|
|
let record = addons[id];
|
|
record.installed = false;
|
|
record.modified = now;
|
|
this._log.debug("Adding change because of uninstall listener: " +
|
|
id);
|
|
this._addChange(now, CHANGE_UNINSTALLED, record);
|
|
}
|
|
}
|
|
|
|
let cb = Async.makeSpinningCallback();
|
|
this.saveState(null, cb);
|
|
cb.wait();
|
|
}
|
|
catch (ex) {
|
|
this._log.warn("Exception: " + Utils.exceptionStr(ex));
|
|
}
|
|
},
|
|
|
|
// AddonListeners
|
|
onEnabling: function onEnabling(addon, requiresRestart) {
|
|
this._handleListener("onEnabling", addon, requiresRestart);
|
|
},
|
|
onEnabled: function onEnabled(addon) {
|
|
this._handleListener("onEnabled", addon);
|
|
},
|
|
onDisabling: function onDisabling(addon, requiresRestart) {
|
|
this._handleListener("onDisabling", addon, requiresRestart);
|
|
},
|
|
onDisabled: function onDisabled(addon) {
|
|
this._handleListener("onDisabled", addon);
|
|
},
|
|
onInstalling: function onInstalling(addon, requiresRestart) {
|
|
this._handleListener("onInstalling", addon, requiresRestart);
|
|
},
|
|
onInstalled: function onInstalled(addon) {
|
|
this._handleListener("onInstalled", addon);
|
|
},
|
|
onUninstalling: function onUninstalling(addon, requiresRestart) {
|
|
this._handleListener("onUninstalling", addon, requiresRestart);
|
|
},
|
|
onUninstalled: function onUninstalled(addon) {
|
|
this._handleListener("onUninstalled", addon);
|
|
},
|
|
onOperationCancelled: function onOperationCancelled(addon) {
|
|
this._handleListener("onOperationCancelled", addon);
|
|
},
|
|
|
|
// InstallListeners
|
|
onInstallEnded: function onInstallEnded(install, addon) {
|
|
this._handleListener("onInstallEnded", addon);
|
|
}
|
|
};
|