mirror of
https://github.com/mozilla/gecko-dev.git
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507 lines
18 KiB
JavaScript
507 lines
18 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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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const Cc = Components.classes;
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const Ci = Components.interfaces;
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const Cu = Components.utils;
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Cu.import("resource://gre/modules/XPCOMUtils.jsm");
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Cu.import("resource://gre/modules/Services.jsm");
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Cu.import("resource://gre/modules/DOMRequestHelper.jsm");
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var DEBUG = false;
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var VERBOSE = false;
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try {
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DEBUG =
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Services.prefs.getBoolPref("dom.mozSettings.SettingsManager.debug.enabled");
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VERBOSE =
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Services.prefs.getBoolPref("dom.mozSettings.SettingsManager.verbose.enabled");
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} catch (ex) { }
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function debug(s) {
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dump("-*- SettingsManager: " + s + "\n");
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}
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XPCOMUtils.defineLazyServiceGetter(Services, "DOMRequest",
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"@mozilla.org/dom/dom-request-service;1",
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"nsIDOMRequestService");
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XPCOMUtils.defineLazyServiceGetter(this, "cpmm",
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"@mozilla.org/childprocessmessagemanager;1",
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"nsIMessageSender");
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XPCOMUtils.defineLazyServiceGetter(this, "mrm",
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"@mozilla.org/memory-reporter-manager;1",
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"nsIMemoryReporterManager");
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XPCOMUtils.defineLazyServiceGetter(this, "uuidgen",
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"@mozilla.org/uuid-generator;1",
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"nsIUUIDGenerator");
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const kObserverSoftLimit = 10;
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/**
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* In order to make SettingsManager work with Privileged Apps, we need the lock
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* to be OOP. However, the lock state needs to be managed on the child process,
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* while the IDB functions now happen on the parent process so we don't have to
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* expose IDB permissions at the child process level. We use the
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* DOMRequestHelper mechanism to deal with DOMRequests/promises across the
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* processes.
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*
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* However, due to the nature of the IDBTransaction lifetime, we need to relay
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* to the parent when to finalize the transaction once the child is done with the
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* lock. We keep a list of all open requests for a lock, and once the lock
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* reaches the end of its receiveMessage function with no more queued requests,
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* we consider it dead. At that point, we send a message to the parent to notify
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* it to finalize the transaction.
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*/
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function SettingsLock(aSettingsManager) {
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if (VERBOSE) debug("settings lock init");
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this._open = true;
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this._settingsManager = aSettingsManager;
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this._id = uuidgen.generateUUID().toString();
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// DOMRequestIpcHelper.initHelper sets this._window
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this.initDOMRequestHelper(this._settingsManager._window, ["Settings:Get:OK", "Settings:Get:KO",
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"Settings:Clear:OK", "Settings:Clear:KO",
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"Settings:Set:OK", "Settings:Set:KO",
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"Settings:Finalize:OK", "Settings:Finalize:KO"]);
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let createLockPayload = {
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lockID: this._id,
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isServiceLock: false,
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windowID: this._settingsManager.innerWindowID,
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lockStack: (new Error).stack
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};
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this.sendMessage("Settings:CreateLock", createLockPayload);
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Services.tm.currentThread.dispatch(this._closeHelper.bind(this), Ci.nsIThread.DISPATCH_NORMAL);
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// We only want to file closeHelper once per set of receiveMessage calls.
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this._closeCalled = true;
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}
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SettingsLock.prototype = {
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__proto__: DOMRequestIpcHelper.prototype,
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set onsettingstransactionsuccess(aHandler) {
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this.__DOM_IMPL__.setEventHandler("onsettingstransactionsuccess", aHandler);
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},
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get onsettingstransactionsuccess() {
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return this.__DOM_IMPL__.getEventHandler("onsettingstransactionsuccess");
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},
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set onsettingstransactionfailure(aHandler) {
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this.__DOM_IMPL__.setEventHandler("onsettingstransactionfailure", aHandler);
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},
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get onsettingstransactionfailure() {
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return this.__DOM_IMPL__.getEventHandler("onsettingstransactionfailure");
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},
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get closed() {
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return !this._open;
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},
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_closeHelper: function() {
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if (VERBOSE) debug("closing lock " + this._id);
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this._open = false;
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this._closeCalled = false;
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if (!this._requests || Object.keys(this._requests).length == 0) {
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if (VERBOSE) debug("Requests exhausted, finalizing " + this._id);
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this._settingsManager.unregisterLock(this._id);
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this.sendMessage("Settings:Finalize", {lockID: this._id});
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} else {
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if (VERBOSE) debug("Requests left: " + Object.keys(this._requests).length);
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this.sendMessage("Settings:Run", {lockID: this._id});
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}
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},
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_wrap: function _wrap(obj) {
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return Cu.cloneInto(obj, this._settingsManager._window);
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},
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sendMessage: function(aMessageName, aData) {
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// sendMessage can be called after our window has died, or get
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// queued to run later in a thread via _closeHelper, but the
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// SettingsManager may have died in between the time it was
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// scheduled and the time it runs. Make sure our window is valid
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// before sending, otherwise just ignore.
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if (!this._settingsManager._window) {
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Cu.reportError(
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"SettingsManager window died, cannot run settings transaction." +
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" SettingsMessage: " + aMessageName +
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" SettingsData: " + JSON.stringify(aData));
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return;
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}
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cpmm.sendAsyncMessage(aMessageName,
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aData,
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undefined,
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this._settingsManager._window.document.nodePrincipal);
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},
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receiveMessage: function(aMessage) {
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let msg = aMessage.data;
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// SettingsRequestManager broadcasts changes to all locks in the child. If
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// our lock isn't being addressed, just return.
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if (msg.lockID != this._id) {
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return;
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}
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if (VERBOSE) debug("receiveMessage (" + this._id + "): " + aMessage.name);
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// Finalizing a transaction does not return a request ID since we are
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// supposed to fire callbacks.
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//
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// We also destroy the DOMRequestHelper after we've received the
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// finalize message. At this point, we will be guarenteed no more
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// request returns are coming from the SettingsRequestManager.
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if (!msg.requestID) {
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let event;
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switch (aMessage.name) {
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case "Settings:Finalize:OK":
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if (VERBOSE) debug("Lock finalize ok: " + this._id);
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event = new this._window.MozSettingsTransactionEvent("settingstransactionsuccess", {});
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this.__DOM_IMPL__.dispatchEvent(event);
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this.destroyDOMRequestHelper();
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break;
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case "Settings:Finalize:KO":
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if (DEBUG) debug("Lock finalize failed: " + this._id);
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event = new this._window.MozSettingsTransactionEvent("settingstransactionfailure", {
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error: msg.errorMsg
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});
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this.__DOM_IMPL__.dispatchEvent(event);
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this.destroyDOMRequestHelper();
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break;
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default:
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if (DEBUG) debug("Message type " + aMessage.name + " is missing a requestID");
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}
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return;
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}
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let req = this.getRequest(msg.requestID);
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if (!req) {
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if (DEBUG) debug("Matching request not found.");
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return;
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}
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this.removeRequest(msg.requestID);
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// DOMRequest callbacks called from here can die due to having
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// things like marionetteScriptFinished in them. Make sure we file
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// our call to run/finalize BEFORE opening the lock and fulfilling
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// DOMRequests.
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if (!this._closeCalled) {
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// We only want to file closeHelper once per set of receiveMessage calls.
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Services.tm.currentThread.dispatch(this._closeHelper.bind(this), Ci.nsIThread.DISPATCH_NORMAL);
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this._closeCalled = true;
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}
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if (VERBOSE) debug("receiveMessage: " + aMessage.name);
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switch (aMessage.name) {
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case "Settings:Get:OK":
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for (let i in msg.settings) {
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msg.settings[i] = this._wrap(msg.settings[i]);
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}
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this._open = true;
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Services.DOMRequest.fireSuccess(req.request, this._wrap(msg.settings));
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this._open = false;
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break;
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case "Settings:Set:OK":
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case "Settings:Clear:OK":
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this._open = true;
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Services.DOMRequest.fireSuccess(req.request, 0);
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this._open = false;
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break;
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case "Settings:Get:KO":
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case "Settings:Set:KO":
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case "Settings:Clear:KO":
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if (DEBUG) debug("error:" + msg.errorMsg);
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Services.DOMRequest.fireError(req.request, msg.errorMsg);
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break;
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default:
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if (DEBUG) debug("Wrong message: " + aMessage.name);
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}
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},
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get: function get(aName) {
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if (VERBOSE) debug("get (" + this._id + "): " + aName);
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if (!this._open) {
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dump("Settings lock not open!\n");
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throw Components.results.NS_ERROR_ABORT;
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}
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let req = this.createRequest();
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let reqID = this.getRequestId({request: req});
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this.sendMessage("Settings:Get", {requestID: reqID,
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lockID: this._id,
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name: aName});
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return req;
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},
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set: function set(aSettings) {
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if (VERBOSE) debug("send: " + JSON.stringify(aSettings));
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if (!this._open) {
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throw "Settings lock not open";
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}
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let req = this.createRequest();
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let reqID = this.getRequestId({request: req});
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this.sendMessage("Settings:Set", {requestID: reqID,
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lockID: this._id,
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settings: aSettings});
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return req;
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},
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clear: function clear() {
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if (VERBOSE) debug("clear");
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if (!this._open) {
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throw "Settings lock not open";
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}
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let req = this.createRequest();
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let reqID = this.getRequestId({request: req});
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this.sendMessage("Settings:Clear", {requestID: reqID,
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lockID: this._id});
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return req;
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},
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classID: Components.ID("{60c9357c-3ae0-4222-8f55-da01428470d5}"),
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contractID: "@mozilla.org/settingsLock;1",
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QueryInterface: XPCOMUtils.generateQI([Ci.nsISupports,
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Ci.nsIObserver,
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Ci.nsISupportsWeakReference])
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};
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function SettingsManager() {
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this._callbacks = null;
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this._isRegistered = false;
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this._locks = [];
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this._createdLocks = 0;
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this._unregisteredLocks = 0;
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}
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SettingsManager.prototype = {
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_wrap: function _wrap(obj) {
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return Cu.cloneInto(obj, this._window);
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},
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set onsettingchange(aHandler) {
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this.__DOM_IMPL__.setEventHandler("onsettingchange", aHandler);
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this.checkMessageRegistration();
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},
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get onsettingchange() {
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return this.__DOM_IMPL__.getEventHandler("onsettingchange");
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},
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createLock: function() {
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let lock = new SettingsLock(this);
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if (VERBOSE) debug("creating lock " + lock._id);
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this._locks.push(lock._id);
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this._createdLocks++;
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return lock;
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},
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unregisterLock: function(aLockID) {
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let lock_index = this._locks.indexOf(aLockID);
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if (lock_index != -1) {
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if (VERBOSE) debug("Unregistering lock " + aLockID);
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this._locks.splice(lock_index, 1);
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this._unregisteredLocks++;
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}
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},
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receiveMessage: function(aMessage) {
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if (VERBOSE) debug("Settings::receiveMessage: " + aMessage.name);
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let msg = aMessage.json;
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switch (aMessage.name) {
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case "Settings:Change:Return:OK":
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if (VERBOSE) debug('data:' + msg.key + ':' + msg.value + '\n');
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let event = new this._window.MozSettingsEvent("settingchange", this._wrap({
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settingName: msg.key,
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settingValue: msg.value
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}));
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this.__DOM_IMPL__.dispatchEvent(event);
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if (this._callbacks && this._callbacks[msg.key]) {
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if (VERBOSE) debug("observe callback called! " + msg.key + " " + this._callbacks[msg.key].length);
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this._callbacks[msg.key].forEach(function(cb) {
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cb(this._wrap({settingName: msg.key, settingValue: msg.value}));
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}.bind(this));
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} else {
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if (VERBOSE) debug("no observers stored!");
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}
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break;
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default:
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if (DEBUG) debug("Wrong message: " + aMessage.name);
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}
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},
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// If we have either observer callbacks or an event handler,
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// register for messages from the main thread. Otherwise, if no one
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// is listening, unregister to reduce parent load.
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checkMessageRegistration: function checkRegistration() {
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let handler = this.__DOM_IMPL__.getEventHandler("onsettingchange");
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if (!this._isRegistered) {
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if (VERBOSE) debug("Registering for messages");
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cpmm.sendAsyncMessage("Settings:RegisterForMessages",
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undefined,
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undefined,
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this._window.document.nodePrincipal);
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this._isRegistered = true;
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} else {
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if ((!this._callbacks || Object.keys(this._callbacks).length == 0) &&
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!handler) {
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if (VERBOSE) debug("Unregistering for messages");
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cpmm.sendAsyncMessage("Settings:UnregisterForMessages",
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undefined,
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undefined,
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this._window.document.nodePrincipal);
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this._isRegistered = false;
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this._callbacks = null;
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}
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}
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},
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addObserver: function addObserver(aName, aCallback) {
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if (VERBOSE) debug("addObserver " + aName);
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if (!this._callbacks) {
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this._callbacks = {};
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}
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if (!this._callbacks[aName]) {
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this._callbacks[aName] = [aCallback];
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} else {
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this._callbacks[aName].push(aCallback);
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}
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let length = this._callbacks[aName].length;
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if (length >= kObserverSoftLimit) {
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debug("WARNING: MORE THAN " + kObserverSoftLimit + " OBSERVERS FOR " +
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aName + ": " + length + " FROM" + (new Error).stack);
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#ifdef DEBUG
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debug("JS STOPS EXECUTING AT THIS POINT IN DEBUG BUILDS!");
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throw Components.results.NS_ERROR_ABORT;
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#endif
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}
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this.checkMessageRegistration();
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},
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removeObserver: function removeObserver(aName, aCallback) {
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if (VERBOSE) debug("deleteObserver " + aName);
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if (this._callbacks && this._callbacks[aName]) {
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let index = this._callbacks[aName].indexOf(aCallback);
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if (index != -1) {
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this._callbacks[aName].splice(index, 1);
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if (this._callbacks[aName].length == 0) {
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delete this._callbacks[aName];
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}
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} else {
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if (VERBOSE) debug("Callback not found for: " + aName);
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}
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} else {
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if (VERBOSE) debug("No observers stored for " + aName);
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}
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this.checkMessageRegistration();
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},
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init: function(aWindow) {
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if (VERBOSE) debug("SettingsManager init");
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mrm.registerStrongReporter(this);
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cpmm.addMessageListener("Settings:Change:Return:OK", this);
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Services.obs.addObserver(this, "inner-window-destroyed", false);
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let util = aWindow.QueryInterface(Ci.nsIInterfaceRequestor).getInterface(Ci.nsIDOMWindowUtils);
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this.innerWindowID = util.currentInnerWindowID;
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this._window = aWindow;
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},
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observe: function(aSubject, aTopic, aData) {
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if (VERBOSE) debug("Topic: " + aTopic);
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if (aTopic === "inner-window-destroyed") {
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let wId = aSubject.QueryInterface(Ci.nsISupportsPRUint64).data;
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if (wId === this.innerWindowID) {
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if (DEBUG) debug("Received: inner-window-destroyed for valid innerWindowID=" + wId + ", cleanup.");
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this.cleanup();
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}
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}
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},
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collectReports: function(aCallback, aData, aAnonymize) {
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for (let topic in this._callbacks) {
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let length = this._callbacks[topic].length;
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if (length == 0) {
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continue;
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}
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let path;
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if (length < kObserverSoftLimit) {
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path = "settings-observers";
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} else {
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path = "settings-observers-suspect/referent(topic=" +
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(aAnonymize ? "<anonymized>" : topic) + ")";
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}
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aCallback.callback("", path,
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Ci.nsIMemoryReporter.KIND_OTHER,
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Ci.nsIMemoryReporter.UNITS_COUNT,
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length,
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"The number of settings observers for this topic.",
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aData);
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}
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aCallback.callback("",
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"settings-locks/alive",
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Ci.nsIMemoryReporter.KIND_OTHER,
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Ci.nsIMemoryReporter.UNITS_COUNT,
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this._locks.length,
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"The number of locks that are currently alives.",
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aData);
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aCallback.callback("",
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"settings-locks/created",
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Ci.nsIMemoryReporter.KIND_OTHER,
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Ci.nsIMemoryReporter.UNITS_COUNT,
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this._createdLocks,
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"The number of locks that were created.",
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aData);
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aCallback.callback("",
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"settings-locks/deleted",
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Ci.nsIMemoryReporter.KIND_OTHER,
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Ci.nsIMemoryReporter.UNITS_COUNT,
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this._unregisteredLocks,
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"The number of locks that were deleted.",
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aData);
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},
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cleanup: function() {
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Services.obs.removeObserver(this, "inner-window-destroyed");
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// At this point, the window is dying, so there's nothing left
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// that we could do with our lock. Go ahead and run finalize on
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// it to make sure changes are commited.
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for (let i = 0; i < this._locks.length; ++i) {
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if (DEBUG) debug("Lock alive at destroy, finalizing: " + this._locks[i]);
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// Due to bug 1105511 we should be able to send this without
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// cached principals. However, this is scary because any iframe
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// in the process could run this?
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cpmm.sendAsyncMessage("Settings:Finalize",
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{lockID: this._locks[i]});
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}
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cpmm.removeMessageListener("Settings:Change:Return:OK", this);
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mrm.unregisterStrongReporter(this);
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this.innerWindowID = null;
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this._window = null;
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},
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|
classID: Components.ID("{c40b1c70-00fb-11e2-a21f-0800200c9a66}"),
|
|
contractID: "@mozilla.org/settingsManager;1",
|
|
QueryInterface: XPCOMUtils.generateQI([Ci.nsISupports,
|
|
Ci.nsIDOMGlobalPropertyInitializer,
|
|
Ci.nsIObserver,
|
|
Ci.nsIMemoryReporter]),
|
|
};
|
|
|
|
this.NSGetFactory = XPCOMUtils.generateNSGetFactory([SettingsManager, SettingsLock]);
|