/* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this file, * You can obtain one at http://mozilla.org/MPL/2.0/. */ this.EXPORTED_SYMBOLS = [ "FrameManager" ]; let FRAME_SCRIPT = "chrome://marionette/content/marionette-listener.js"; Cu.import("resource://gre/modules/Services.jsm"); Cu.import("resource://gre/modules/XPCOMUtils.jsm"); Cu.import("resource://gre/modules/services-common/log4moz.js"); let logger = Log4Moz.repository.getLogger("Marionette"); //list of OOP frames that has the frame script loaded let remoteFrames = []; /** * An object representing a frame that Marionette has loaded a * frame script in. */ function MarionetteRemoteFrame(windowId, frameId) { this.windowId = windowId; //outerWindowId relative to main process this.frameId = frameId ? frameId : null; //actual frame relative to windowId's frames list this.targetFrameId = this.frameId; //assigned FrameId, used for messaging }; /** * The FrameManager will maintain the list of Out Of Process (OOP) frames and will handle * frame switching between them. * It handles explicit frame switching (switchToFrame), and implicit frame switching, which * occurs when a modal dialog is triggered in B2G. * */ this.FrameManager = function FrameManager(server) { //messageManager maintains the messageManager for the current process' chrome frame or the global message manager this.currentRemoteFrame = null; //holds a member of remoteFrames (for an OOP frame) or null (for the main process) this.previousRemoteFrame = null; //frame we'll need to restore once interrupt is gone this.handledModal = false; //set to true when we have been interrupted by a modal this.server = server; // a reference to the marionette server }; FrameManager.prototype = { QueryInterface: XPCOMUtils.generateQI([Ci.nsIMessageListener, Ci.nsISupportsWeakReference]), /** * Receives all messages from content messageManager */ receiveMessage: function FM_receiveMessage(message) { switch (message.name) { case "MarionetteFrame:getInterruptedState": // This will return true if the calling frame was interrupted by a modal dialog if (this.previousRemoteFrame) { let interruptedFrame = Services.wm.getOuterWindowWithId(this.previousRemoteFrame.windowId);//get the frame window of the interrupted frame if (this.previousRemoteFrame.frameId != null) { interruptedFrame = interruptedFrame.document.getElementsByTagName("iframe")[this.previousRemoteFrame.frameId]; //find the OOP frame } //check if the interrupted frame is the same as the calling frame if (interruptedFrame.src == message.target.src) { return {value: this.handledModal}; } } else if (this.currentRemoteFrame == null) { // we get here if previousRemoteFrame and currentRemoteFrame are null, ie: if we're in a non-OOP process, or we haven't switched into an OOP frame, in which case, handledModal can't be set to true. return {value: this.handledModal}; } return {value: false}; case "MarionetteFrame:handleModal": /* * handleModal is called when we need to switch frames to the main process due to a modal dialog interrupt. */ // If previousRemoteFrame was set, that means we switched into a remote frame. // If this is the case, then we want to switch back into the system frame. // If it isn't the case, then we're in a non-OOP environment, so we don't need to handle remote frames let isLocal = true; if (this.currentRemoteFrame != null) { isLocal = false; this.removeMessageManagerListeners(this.currentRemoteFrame.messageManager.get()); //store the previous frame so we can switch back to it when the modal is dismissed this.previousRemoteFrame = this.currentRemoteFrame; //by setting currentRemoteFrame to null, it signifies we're in the main process this.currentRemoteFrame = null; this.server.messageManager = Cc["@mozilla.org/globalmessagemanager;1"] .getService(Ci.nsIMessageBroadcaster); } this.handledModal = true; this.server.sendOk(this.server.command_id); return {value: isLocal}; } }, //This is just 'switch to OOP frame'. We're handling this here so we can maintain a list of remoteFrames. switchToFrame: function FM_switchToFrame(message) { // Switch to a remote frame. let frameWindow = Services.wm.getOuterWindowWithId(message.json.win); //get the original frame window let oopFrame = frameWindow.document.getElementsByTagName("iframe")[message.json.frame]; //find the OOP frame let mm = oopFrame.QueryInterface(Ci.nsIFrameLoaderOwner).frameLoader.messageManager; //get the OOP frame's mm // See if this frame already has our frame script loaded in it; if so, // just wake it up. for (let i = 0; i < remoteFrames.length; i++) { let frame = remoteFrames[i]; let frameMessageManager = frame.messageManager.get(); logger.info("trying remote frame " + i); try { frameMessageManager.sendAsyncMessage("aliveCheck", {}); } catch(e) { if (e.result == Components.results.NS_ERROR_NOT_INITIALIZED) { logger.info("deleting frame"); remoteFrames.splice(i, 1); continue; } } if (frameMessageManager == mm) { this.currentRemoteFrame = frame; this.addMessageManagerListeners(mm); mm.sendAsyncMessage("Marionette:restart", {}); return; } } // If we get here, then we need to load the frame script in this frame, // and set the frame's ChromeMessageSender as the active message manager the server will listen to this.addMessageManagerListeners(mm); logger.info("frame-manager load script: " + mm.toString()); mm.loadFrameScript(FRAME_SCRIPT, true); let aFrame = new MarionetteRemoteFrame(message.json.win, message.json.frame); aFrame.messageManager = Cu.getWeakReference(mm); remoteFrames.push(aFrame); this.currentRemoteFrame = aFrame; }, /* * This function handles switching back to the frame that was interrupted by the modal dialog. * This function gets called by the interrupted frame once the dialog is dismissed and the frame resumes its process */ switchToModalOrigin: function FM_switchToModalOrigin() { //only handle this if we indeed switched out of the modal's originating frame if (this.previousRemoteFrame != null) { this.currentRemoteFrame = this.previousRemoteFrame; this.addMessageManagerListeners(this.currentRemoteFrame.messageManager.get()); } this.handledModal = false; }, /** * Adds message listeners to the server, listening for messages from content frame scripts. * It also adds a "MarionetteFrame:getInterruptedState" message listener to the FrameManager, * so the frame manager's state can be checked by the frame * * @param object messageManager * The messageManager object (ChromeMessageBroadcaster or ChromeMessageSender) * to which the listeners should be added. */ addMessageManagerListeners: function MDA_addMessageManagerListeners(messageManager) { messageManager.addWeakMessageListener("Marionette:ok", this.server); messageManager.addWeakMessageListener("Marionette:done", this.server); messageManager.addWeakMessageListener("Marionette:error", this.server); messageManager.addWeakMessageListener("Marionette:log", this.server); messageManager.addWeakMessageListener("Marionette:shareData", this.server); messageManager.addWeakMessageListener("Marionette:register", this.server); messageManager.addWeakMessageListener("Marionette:runEmulatorCmd", this.server); messageManager.addWeakMessageListener("Marionette:switchToModalOrigin", this.server); messageManager.addWeakMessageListener("Marionette:switchToFrame", this.server); messageManager.addWeakMessageListener("Marionette:switchedToFrame", this.server); messageManager.addWeakMessageListener("MarionetteFrame:handleModal", this); messageManager.addWeakMessageListener("MarionetteFrame:getInterruptedState", this); }, /** * Removes listeners for messages from content frame scripts. * We do not remove the "MarionetteFrame:getInterruptedState" or the * "Marioentte:switchToModalOrigin" message listener, * because we want to allow all known frames to contact the frame manager so that * it can check if it was interrupted, and if so, it will call switchToModalOrigin * when its process gets resumed. * * @param object messageManager * The messageManager object (ChromeMessageBroadcaster or ChromeMessageSender) * from which the listeners should be removed. */ removeMessageManagerListeners: function MDA_removeMessageManagerListeners(messageManager) { messageManager.removeWeakMessageListener("Marionette:ok", this.server); messageManager.removeWeakMessageListener("Marionette:done", this.server); messageManager.removeWeakMessageListener("Marionette:error", this.server); messageManager.removeWeakMessageListener("Marionette:log", this.server); messageManager.removeWeakMessageListener("Marionette:shareData", this.server); messageManager.removeWeakMessageListener("Marionette:register", this.server); messageManager.removeWeakMessageListener("Marionette:runEmulatorCmd", this.server); messageManager.removeWeakMessageListener("Marionette:switchToFrame", this.server); messageManager.removeWeakMessageListener("Marionette:switchedToFrame", this.server); messageManager.removeWeakMessageListener("MarionetteFrame:handleModal", this); }, };