forked from mirrors/gecko-dev
415 lines
13 KiB
JavaScript
415 lines
13 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/**
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* Session Storage and Restoration
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*
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* Overview
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* This service reads user's session file at startup, and makes a determination
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* as to whether the session should be restored. It will restore the session
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* under the circumstances described below. If the auto-start Private Browsing
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* mode is active, however, the session is never restored.
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*
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* Crash Detection
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* The CrashMonitor is used to check if the final session state was successfully
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* written at shutdown of the last session. If we did not reach
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* 'sessionstore-final-state-write-complete', then it's assumed that the browser
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* has previously crashed and we should restore the session.
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*
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* Forced Restarts
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* In the event that a restart is required due to application update or extension
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* installation, set the browser.sessionstore.resume_session_once pref to true,
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* and the session will be restored the next time the browser starts.
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*
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* Always Resume
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* This service will always resume the session if the integer pref
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* browser.startup.page is set to 3.
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*/
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/* :::::::: Constants and Helpers ::::::::::::::: */
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const lazy = {};
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ChromeUtils.defineESModuleGetters(lazy, {
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CrashMonitor: "resource://gre/modules/CrashMonitor.sys.mjs",
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PrivateBrowsingUtils: "resource://gre/modules/PrivateBrowsingUtils.sys.mjs",
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SessionFile: "resource:///modules/sessionstore/SessionFile.sys.mjs",
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StartupPerformance:
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"resource:///modules/sessionstore/StartupPerformance.sys.mjs",
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});
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const STATE_RUNNING_STR = "running";
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const TYPE_NO_SESSION = 0;
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const TYPE_RECOVER_SESSION = 1;
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const TYPE_RESUME_SESSION = 2;
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const TYPE_DEFER_SESSION = 3;
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// 'browser.startup.page' preference value to resume the previous session.
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const BROWSER_STARTUP_RESUME_SESSION = 3;
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function warning(msg, exception) {
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let consoleMsg = Cc["@mozilla.org/scripterror;1"].createInstance(
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Ci.nsIScriptError
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);
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consoleMsg.init(
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msg,
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exception.fileName,
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null,
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exception.lineNumber,
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0,
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Ci.nsIScriptError.warningFlag,
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"component javascript"
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);
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Services.console.logMessage(consoleMsg);
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}
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var gOnceInitializedDeferred = (function () {
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let deferred = {};
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deferred.promise = new Promise((resolve, reject) => {
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deferred.resolve = resolve;
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deferred.reject = reject;
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});
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return deferred;
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})();
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/* :::::::: The Service ::::::::::::::: */
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export var SessionStartup = {
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NO_SESSION: TYPE_NO_SESSION,
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RECOVER_SESSION: TYPE_RECOVER_SESSION,
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RESUME_SESSION: TYPE_RESUME_SESSION,
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DEFER_SESSION: TYPE_DEFER_SESSION,
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// The state to restore at startup.
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_initialState: null,
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_sessionType: null,
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_initialized: false,
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// Stores whether the previous session crashed.
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_previousSessionCrashed: null,
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_resumeSessionEnabled: null,
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/* ........ Global Event Handlers .............. */
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/**
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* Initialize the component
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*/
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init() {
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Services.obs.notifyObservers(null, "sessionstore-init-started");
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lazy.StartupPerformance.init();
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// do not need to initialize anything in auto-started private browsing sessions
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if (lazy.PrivateBrowsingUtils.permanentPrivateBrowsing) {
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this._initialized = true;
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gOnceInitializedDeferred.resolve();
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return;
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}
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if (
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Services.prefs.getBoolPref(
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"browser.sessionstore.resuming_after_os_restart"
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)
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) {
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if (!Services.appinfo.restartedByOS) {
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// We had set resume_session_once in order to resume after an OS restart,
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// but we aren't automatically started by the OS (or else appinfo.restartedByOS
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// would have been set). Therefore we should clear resume_session_once
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// to avoid forcing a resume for a normal startup.
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Services.prefs.setBoolPref(
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"browser.sessionstore.resume_session_once",
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false
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);
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}
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Services.prefs.setBoolPref(
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"browser.sessionstore.resuming_after_os_restart",
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false
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);
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}
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lazy.SessionFile.read().then(
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this._onSessionFileRead.bind(this),
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console.error
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);
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},
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// Wrap a string as a nsISupports.
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_createSupportsString(data) {
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let string = Cc["@mozilla.org/supports-string;1"].createInstance(
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Ci.nsISupportsString
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);
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string.data = data;
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return string;
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},
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/**
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* Complete initialization once the Session File has been read.
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*
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* @param source The Session State string read from disk.
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* @param parsed The object obtained by parsing |source| as JSON.
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*/
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_onSessionFileRead({ source, parsed, noFilesFound }) {
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this._initialized = true;
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// Let observers modify the state before it is used
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let supportsStateString = this._createSupportsString(source);
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Services.obs.notifyObservers(
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supportsStateString,
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"sessionstore-state-read"
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);
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let stateString = supportsStateString.data;
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if (stateString != source) {
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// The session has been modified by an add-on, reparse.
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try {
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this._initialState = JSON.parse(stateString);
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} catch (ex) {
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// That's not very good, an add-on has rewritten the initial
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// state to something that won't parse.
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warning("Observer rewrote the state to something that won't parse", ex);
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}
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} else {
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// No need to reparse
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this._initialState = parsed;
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}
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if (this._initialState == null) {
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// No valid session found.
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this._sessionType = this.NO_SESSION;
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Services.obs.notifyObservers(null, "sessionstore-state-finalized");
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gOnceInitializedDeferred.resolve();
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return;
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}
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let initialState = this._initialState;
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Services.tm.idleDispatchToMainThread(() => {
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let pinnedTabCount = initialState.windows.reduce((winAcc, win) => {
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return (
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winAcc +
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win.tabs.reduce((tabAcc, tab) => {
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return tabAcc + (tab.pinned ? 1 : 0);
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}, 0)
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);
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}, 0);
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Services.telemetry.scalarSetMaximum(
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"browser.engagement.max_concurrent_tab_pinned_count",
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pinnedTabCount
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);
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}, 60000);
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// If this is a normal restore then throw away any previous session.
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if (!this.isAutomaticRestoreEnabled() && this._initialState) {
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delete this._initialState.lastSessionState;
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}
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lazy.CrashMonitor.previousCheckpoints.then(checkpoints => {
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if (checkpoints) {
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// If the previous session finished writing the final state, we'll
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// assume there was no crash.
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this._previousSessionCrashed =
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!checkpoints["sessionstore-final-state-write-complete"];
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} else if (noFilesFound) {
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// If the Crash Monitor could not load a checkpoints file it will
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// provide null. This could occur on the first run after updating to
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// a version including the Crash Monitor, or if the checkpoints file
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// was removed, or on first startup with this profile, or after Firefox Reset.
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// There was no checkpoints file and no sessionstore.js or its backups,
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// so we will assume that this was a fresh profile.
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this._previousSessionCrashed = false;
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} else {
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// If this is the first run after an update, sessionstore.js should
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// still contain the session.state flag to indicate if the session
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// crashed. If it is not present, we will assume this was not the first
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// run after update and the checkpoints file was somehow corrupted or
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// removed by a crash.
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//
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// If the session.state flag is present, we will fallback to using it
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// for crash detection - If the last write of sessionstore.js had it
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// set to "running", we crashed.
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let stateFlagPresent =
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this._initialState.session && this._initialState.session.state;
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this._previousSessionCrashed =
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!stateFlagPresent ||
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this._initialState.session.state == STATE_RUNNING_STR;
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}
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// Report shutdown success via telemetry. Shortcoming here are
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// being-killed-by-OS-shutdown-logic, shutdown freezing after
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// session restore was written, etc.
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Services.telemetry
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.getHistogramById("SHUTDOWN_OK")
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.add(!this._previousSessionCrashed);
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Services.obs.addObserver(this, "sessionstore-windows-restored", true);
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if (this.sessionType == this.NO_SESSION) {
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this._initialState = null; // Reset the state.
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} else {
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Services.obs.addObserver(this, "browser:purge-session-history", true);
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}
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// We're ready. Notify everyone else.
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Services.obs.notifyObservers(null, "sessionstore-state-finalized");
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gOnceInitializedDeferred.resolve();
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});
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},
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/**
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* Handle notifications
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*/
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observe(subject, topic, data) {
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switch (topic) {
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case "sessionstore-windows-restored":
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Services.obs.removeObserver(this, "sessionstore-windows-restored");
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// Free _initialState after nsSessionStore is done with it.
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this._initialState = null;
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this._didRestore = true;
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break;
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case "browser:purge-session-history":
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Services.obs.removeObserver(this, "browser:purge-session-history");
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// Reset all state on sanitization.
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this._sessionType = this.NO_SESSION;
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break;
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}
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},
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/* ........ Public API ................*/
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get onceInitialized() {
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return gOnceInitializedDeferred.promise;
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},
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/**
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* Get the session state as a jsval
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*/
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get state() {
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return this._initialState;
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},
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/**
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* Determines whether automatic session restoration is enabled for this
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* launch of the browser. This does not include crash restoration. In
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* particular, if session restore is configured to restore only in case of
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* crash, this method returns false.
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* @returns bool
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*/
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isAutomaticRestoreEnabled() {
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if (this._resumeSessionEnabled === null) {
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this._resumeSessionEnabled =
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!lazy.PrivateBrowsingUtils.permanentPrivateBrowsing &&
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(Services.prefs.getBoolPref(
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"browser.sessionstore.resume_session_once"
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) ||
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Services.prefs.getIntPref("browser.startup.page") ==
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BROWSER_STARTUP_RESUME_SESSION);
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}
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return this._resumeSessionEnabled;
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},
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/**
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* Determines whether there is a pending session restore.
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* @returns bool
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*/
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willRestore() {
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return (
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this.sessionType == this.RECOVER_SESSION ||
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this.sessionType == this.RESUME_SESSION
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);
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},
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/**
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* Determines whether there is a pending session restore and if that will refer
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* back to a crash.
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* @returns bool
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*/
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willRestoreAsCrashed() {
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return this.sessionType == this.RECOVER_SESSION;
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},
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/**
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* Returns a boolean or a promise that resolves to a boolean, indicating
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* whether we will restore a session that ends up replacing the homepage.
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* True guarantees that we'll restore a session; false means that we
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* /probably/ won't do so.
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* The browser uses this to avoid unnecessarily loading the homepage when
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* restoring a session.
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*/
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get willOverrideHomepage() {
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// If the session file hasn't been read yet and resuming the session isn't
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// enabled via prefs, go ahead and load the homepage. We may still replace
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// it when recovering from a crash, which we'll only know after reading the
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// session file, but waiting for that would delay loading the homepage in
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// the non-crash case.
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if (!this._initialState && !this.isAutomaticRestoreEnabled()) {
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return false;
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}
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// If we've already restored the session, we won't override again.
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if (this._didRestore) {
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return false;
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}
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return new Promise(resolve => {
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this.onceInitialized.then(() => {
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// If there are valid windows with not only pinned tabs, signal that we
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// will override the default homepage by restoring a session.
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resolve(
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this.willRestore() &&
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this._initialState &&
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this._initialState.windows &&
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(!this.willRestoreAsCrashed()
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? this._initialState.windows.filter(w => !w._maybeDontRestoreTabs)
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: this._initialState.windows
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).some(w => w.tabs.some(t => !t.pinned))
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);
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});
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});
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},
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/**
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* Get the type of pending session store, if any.
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*/
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get sessionType() {
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if (this._sessionType === null) {
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let resumeFromCrash = Services.prefs.getBoolPref(
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"browser.sessionstore.resume_from_crash"
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);
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// Set the startup type.
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if (this.isAutomaticRestoreEnabled()) {
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this._sessionType = this.RESUME_SESSION;
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} else if (this._previousSessionCrashed && resumeFromCrash) {
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this._sessionType = this.RECOVER_SESSION;
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} else if (this._initialState) {
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this._sessionType = this.DEFER_SESSION;
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} else {
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this._sessionType = this.NO_SESSION;
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}
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}
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return this._sessionType;
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},
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/**
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* Get whether the previous session crashed.
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*/
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get previousSessionCrashed() {
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return this._previousSessionCrashed;
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},
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resetForTest() {
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this._resumeSessionEnabled = null;
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this._sessionType = null;
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},
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QueryInterface: ChromeUtils.generateQI([
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"nsIObserver",
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"nsISupportsWeakReference",
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]),
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};
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