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368 lines
12 KiB
JavaScript
368 lines
12 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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* Marina Samuel <msamuel@mozilla.com>
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* Philipp von Weitershausen <philipp@weitershausen.de>
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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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const EXPORTED_SYMBOLS = ["SyncScheduler"];
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const Cu = Components.utils;
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Cu.import("resource://services-sync/constants.js");
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Cu.import("resource://services-sync/log4moz.js");
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Cu.import("resource://services-sync/util.js");
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Cu.import("resource://services-sync/engines.js");
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Cu.import("resource://services-sync/engines/clients.js");
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Cu.import("resource://services-sync/status.js");
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Cu.import("resource://services-sync/main.js"); // So we can get to Service for callbacks.
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let SyncScheduler = {
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_log: Log4Moz.repository.getLogger("Sync.SyncScheduler"),
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/**
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* The nsITimer object that schedules the next sync. See scheduleNextSync().
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*/
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syncTimer: null,
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setDefaults: function setDefaults() {
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this._log.trace("Setting SyncScheduler policy values to defaults.");
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// A user is non-idle on startup by default.
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this.idle = false;
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this.hasIncomingItems = false;
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this.numClients = 0;
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this.nextSync = 0,
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this.syncInterval = SINGLE_USER_SYNC;
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this.syncThreshold = SINGLE_USER_THRESHOLD;
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},
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get globalScore() Svc.Prefs.get("globalScore", 0),
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set globalScore(value) Svc.Prefs.set("globalScore", value),
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init: function init() {
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this._log.level = Log4Moz.Level[Svc.Prefs.get("log.logger.service.main")];
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this.setDefaults();
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Svc.Obs.add("weave:engine:score:updated", this);
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Svc.Obs.add("network:offline-status-changed", this);
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Svc.Obs.add("weave:service:sync:start", this);
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Svc.Obs.add("weave:service:sync:finish", this);
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Svc.Obs.add("weave:engine:sync:finish", this);
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Svc.Obs.add("weave:service:login:error", this);
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Svc.Obs.add("weave:service:logout:finish", this);
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Svc.Obs.add("weave:service:sync:error", this);
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Svc.Obs.add("weave:service:backoff:interval", this);
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Svc.Obs.add("weave:engine:sync:applied", this);
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Svc.Idle.addIdleObserver(this, IDLE_TIME);
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},
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observe: function observe(subject, topic, data) {
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switch(topic) {
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case "weave:engine:score:updated":
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Utils.namedTimer(this.calculateScore, SCORE_UPDATE_DELAY, this,
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"_scoreTimer");
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break;
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case "network:offline-status-changed":
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// Whether online or offline, we'll reschedule syncs
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this._log.trace("Network offline status change: " + data);
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this.checkSyncStatus();
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break;
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case "weave:service:sync:start":
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// Clear out any potentially pending syncs now that we're syncing
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this.clearSyncTriggers();
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this.nextSync = 0;
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// reset backoff info, if the server tells us to continue backing off,
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// we'll handle that later
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Status.resetBackoff();
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this.globalScore = 0;
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break;
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case "weave:service:sync:finish":
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this.adjustSyncInterval();
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let sync_interval;
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this._syncErrors = 0;
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if (Status.sync == NO_SYNC_NODE_FOUND) {
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this._log.trace("Scheduling a sync at interval NO_SYNC_NODE_FOUND.");
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sync_interval = NO_SYNC_NODE_INTERVAL;
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}
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this.scheduleNextSync(sync_interval);
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break;
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case "weave:engine:sync:finish":
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if (subject == "clients") {
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// Update the client mode because it might change what we sync.
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this.updateClientMode();
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}
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break;
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case "weave:service:login:error":
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this.clearSyncTriggers();
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// Try again later, just as if we threw an error... only without the
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// error count.
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if (Status.login == MASTER_PASSWORD_LOCKED) {
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this._log.debug("Couldn't log in: master password is locked.");
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this._log.trace("Scheduling a sync at MASTER_PASSWORD_LOCKED_RETRY_INTERVAL");
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this.scheduleAtInterval(MASTER_PASSWORD_LOCKED_RETRY_INTERVAL);
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}
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break;
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case "weave:service:logout:finish":
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// Start or cancel the sync timer depending on if
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// logged in or logged out
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this.checkSyncStatus();
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break;
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case "weave:service:sync:error":
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this.adjustSyncInterval();
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this.handleSyncError();
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break;
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case "weave:service:backoff:interval":
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let interval = (data + Math.random() * data * 0.25) * 1000; // required backoff + up to 25%
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Status.backoffInterval = interval;
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Status.minimumNextSync = Date.now() + data;
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break;
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case "weave:engine:sync:applied":
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let numItems = subject.applied;
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this._log.trace("Engine " + data + " applied " + numItems + " items.");
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if (numItems)
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this.hasIncomingItems = true;
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break;
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case "idle":
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this._log.trace("We're idle.");
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this.idle = true;
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// Adjust the interval for future syncs. This won't actually have any
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// effect until the next pending sync (which will happen soon since we
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// were just active.)
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this.adjustSyncInterval();
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break;
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case "back":
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this._log.trace("We're no longer idle.");
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this.idle = false;
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// Trigger a sync if we have multiple clients.
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if (this.numClients > 1) {
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Utils.nextTick(Weave.Service.sync, Weave.Service);
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}
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break;
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}
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},
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adjustSyncInterval: function adjustSyncInterval() {
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if (this.numClients <= 1) {
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this._log.trace("Adjusting syncInterval to SINGLE_USER_SYNC");
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this.syncInterval = SINGLE_USER_SYNC;
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return;
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}
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// Only MULTI_DEVICE clients will enter this if statement
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// since SINGLE_USER clients will be handled above.
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if (this.idle) {
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this._log.trace("Adjusting syncInterval to MULTI_DEVICE_IDLE_SYNC.");
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this.syncInterval = MULTI_DEVICE_IDLE_SYNC;
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return;
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}
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if (this.hasIncomingItems) {
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this._log.trace("Adjusting syncInterval to MULTI_DEVICE_IMMEDIATE_SYNC.");
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this.hasIncomingItems = false;
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this.syncInterval = MULTI_DEVICE_IMMEDIATE_SYNC;
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} else {
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this._log.trace("Adjusting syncInterval to MULTI_DEVICE_ACTIVE_SYNC.");
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this.syncInterval = MULTI_DEVICE_ACTIVE_SYNC;
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}
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},
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calculateScore: function calculateScore() {
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var engines = Engines.getEnabled();
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for (let i = 0;i < engines.length;i++) {
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this._log.trace(engines[i].name + ": score: " + engines[i].score);
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this.globalScore += engines[i].score;
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engines[i]._tracker.resetScore();
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}
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this._log.trace("Global score updated: " + this.globalScore);
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this.checkSyncStatus();
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},
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/**
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* Process the locally stored clients list to figure out what mode to be in
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*/
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updateClientMode: function updateClientMode() {
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// Nothing to do if it's the same amount
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let {numClients} = Clients.stats;
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if (this.numClients == numClients)
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return;
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this._log.debug("Client count: " + this.numClients + " -> " + numClients);
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this.numClients = numClients;
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if (numClients <= 1) {
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this._log.trace("Adjusting syncThreshold to SINGLE_USER_THRESHOLD");
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this.syncThreshold = SINGLE_USER_THRESHOLD;
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} else {
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this._log.trace("Adjusting syncThreshold to MULTI_DEVICE_THRESHOLD");
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this.syncThreshold = MULTI_DEVICE_THRESHOLD;
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}
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this.adjustSyncInterval();
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},
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/**
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* Check if we should be syncing and schedule the next sync, if it's not scheduled
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*/
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checkSyncStatus: function checkSyncStatus() {
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// Should we be syncing now, if not, cancel any sync timers and return
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// if we're in backoff, we'll schedule the next sync
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let ignore = [kSyncBackoffNotMet];
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// We're ready to sync even if we're not logged in... so long as the
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// master password isn't locked.
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if (Utils.mpLocked()) {
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ignore.push(kSyncNotLoggedIn);
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ignore.push(kSyncMasterPasswordLocked);
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}
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let skip = Weave.Service._checkSync(ignore);
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this._log.trace("_checkSync returned \"" + skip + "\".");
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if (skip) {
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this.clearSyncTriggers();
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return;
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}
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// Only set the wait time to 0 if we need to sync right away
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let wait;
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if (this.globalScore > this.syncThreshold) {
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this._log.debug("Global Score threshold hit, triggering sync.");
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wait = 0;
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}
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this.scheduleNextSync(wait);
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},
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/**
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* Call sync() if Master Password is not locked.
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*
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* Otherwise, reschedule a sync for later.
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*/
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syncIfMPUnlocked: function syncIfMPUnlocked() {
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// No point if we got kicked out by the master password dialog.
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if (Status.login == MASTER_PASSWORD_LOCKED &&
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Utils.mpLocked()) {
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this._log.debug("Not initiating sync: Login status is " + Status.login);
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// If we're not syncing now, we need to schedule the next one.
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this._log.trace("Scheduling a sync at MASTER_PASSWORD_LOCKED_RETRY_INTERVAL");
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this.scheduleAtInterval(MASTER_PASSWORD_LOCKED_RETRY_INTERVAL);
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return;
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}
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Utils.nextTick(Weave.Service.sync, Weave.Service);
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},
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/**
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* Set a timer for the next sync
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*/
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scheduleNextSync: function scheduleNextSync(interval) {
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// Figure out when to sync next if not given a interval to wait
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if (interval == null || interval == undefined) {
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// Check if we had a pending sync from last time
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if (this.nextSync != 0)
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interval = this.nextSync - Date.now();
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// Use the bigger of default sync interval and backoff
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else
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interval = Math.max(this.syncInterval, Status.backoffInterval);
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}
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// Start the sync right away if we're already late
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if (interval <= 0) {
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this.syncIfMPUnlocked();
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return;
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}
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this._log.trace("Next sync in " + Math.ceil(interval / 1000) + " sec.");
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Utils.namedTimer(this._syncIfMPUnlocked, interval, this, "syncTimer");
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// Save the next sync time in-case sync is disabled (logout/offline/etc.)
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this.nextSync = Date.now() + interval;
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},
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/**
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* Incorporates the backoff/retry logic used in error handling and elective
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* non-syncing.
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*/
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scheduleAtInterval: function scheduleAtInterval(minimumInterval) {
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let interval = Utils.calculateBackoff(this._syncErrors, MINIMUM_BACKOFF_INTERVAL);
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if (minimumInterval)
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interval = Math.max(minimumInterval, interval);
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let d = new Date(Date.now() + interval);
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this._log.config("Starting backoff, next sync at:" + d.toString());
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this.scheduleNextSync(interval);
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},
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_syncErrors: 0,
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/**
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* Deal with sync errors appropriately
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*/
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handleSyncError: function handleSyncError() {
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this._syncErrors++;
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// Do nothing on the first couple of failures, if we're not in
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// backoff due to 5xx errors.
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if (!Status.enforceBackoff) {
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if (this._syncErrors < MAX_ERROR_COUNT_BEFORE_BACKOFF) {
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this.scheduleNextSync();
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return;
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}
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Status.enforceBackoff = true;
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}
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this.scheduleAtInterval();
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},
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/**
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* Remove any timers/observers that might trigger a sync
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*/
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clearSyncTriggers: function clearSyncTriggers() {
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this._log.debug("Clearing sync triggers.");
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// Clear out any scheduled syncs
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if (this.syncTimer)
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this.syncTimer.clear();
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}
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};
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