1 files changed, 338 insertions, 0 deletions
diff --git a/toolkit/jetpack/sdk/remote/parent.js b/toolkit/jetpack/sdk/remote/parent.js
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+++ b/toolkit/jetpack/sdk/remote/parent.js
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+/* 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/. */
+"use strict";
+
+const { isChildLoader } = require('./core');
+if (isChildLoader)
+  throw new Error("Cannot load sdk/remote/parent in a child loader.");
+
+const { Cu, Ci, Cc } = require('chrome');
+const runtime = require('../system/runtime');
+
+const MAIN_PROCESS = Ci.nsIXULRuntime.PROCESS_TYPE_DEFAULT;
+
+if (runtime.processType != MAIN_PROCESS) {
+  throw new Error('Cannot use sdk/remote/parent in a child process.');
+}
+
+const { Class } = require('../core/heritage');
+const { Namespace } = require('../core/namespace');
+const { Disposable } = require('../core/disposable');
+const { omit } = require('../util/object');
+const { when } = require('../system/unload');
+const { EventTarget } = require('../event/target');
+const { emit } = require('../event/core');
+const system = require('../system/events');
+const { EventParent } = require('./utils');
+const options = require('@loader/options');
+const loaderModule = require('toolkit/loader');
+const { getTabForBrowser } = require('../tabs/utils');
+
+const appInfo = Cc["@mozilla.org/xre/app-info;1"].
+                getService(Ci.nsIXULRuntime);
+
+exports.useRemoteProcesses = appInfo.browserTabsRemoteAutostart;
+
+// Chose the right function for resolving relative a module id
+var moduleResolve;
+if (options.isNative) {
+  moduleResolve = (id, requirer) => loaderModule.nodeResolve(id, requirer, { rootURI: options.rootURI });
+}
+else {
+  moduleResolve = loaderModule.resolve;
+}
+// Build the sorted path mapping structure that resolveURI requires
+var pathMapping = Object.keys(options.paths)
+                        .sort((a, b) => b.length - a.length)
+                        .map(p => [p, options.paths[p]]);
+
+// Load the scripts in the child processes
+var { getNewLoaderID } = require('../../framescript/FrameScriptManager.jsm');
+var PATH = options.paths[''];
+
+const childOptions = omit(options, ['modules', 'globals', 'resolve', 'load']);
+childOptions.modules = {};
+// @l10n/data is just JSON data and can be safely sent across to the child loader
+try {
+  childOptions.modules["@l10n/data"] = require("@l10n/data");
+}
+catch (e) {
+  // There may be no l10n data
+}
+const loaderID = getNewLoaderID();
+childOptions.loaderID = loaderID;
+childOptions.childLoader = true;
+
+const ppmm = Cc['@mozilla.org/parentprocessmessagemanager;1'].
+             getService(Ci.nsIMessageBroadcaster);
+const gmm = Cc['@mozilla.org/globalmessagemanager;1'].
+            getService(Ci.nsIMessageBroadcaster);
+
+const ns = Namespace();
+
+var processMap = new Map();
+
+function definePort(obj, name) {
+  obj.port.emitCPOW = (event, args, cpows = {}) => {
+    let manager = ns(obj).messageManager;
+    if (!manager)
+      return;
+
+    let method = manager instanceof Ci.nsIMessageBroadcaster ?
+                 "broadcastAsyncMessage" : "sendAsyncMessage";
+
+    manager[method](name, { loaderID, event, args }, cpows);
+  };
+
+  obj.port.emit = (event, ...args) => obj.port.emitCPOW(event, args);
+}
+
+function messageReceived({ target, data }) {
+  // Ignore messages from other loaders
+  if (data.loaderID != loaderID)
+    return;
+
+  emit(this.port, data.event, this, ...data.args);
+}
+
+// Process represents a gecko process that can load webpages. Each process
+// contains a number of Frames. This class is used to send and receive messages
+// from a single process.
+const Process = Class({
+  implements: [ Disposable ],
+  extends: EventTarget,
+  setup: function(id, messageManager, isRemote) {
+    ns(this).id = id;
+    ns(this).isRemote = isRemote;
+    ns(this).messageManager = messageManager;
+    ns(this).messageReceived = messageReceived.bind(this);
+    this.destroy = this.destroy.bind(this);
+    ns(this).messageManager.addMessageListener('sdk/remote/process/message', ns(this).messageReceived);
+    ns(this).messageManager.addMessageListener('child-process-shutdown', this.destroy);
+
+    this.port = new EventTarget();
+    definePort(this, 'sdk/remote/process/message');
+
+    // Load any remote modules
+    for (let module of remoteModules.values())
+      this.port.emit('sdk/remote/require', module);
+
+    processMap.set(ns(this).id, this);
+    processes.attachItem(this);
+  },
+
+  dispose: function() {
+    emit(this, 'detach', this);
+    processMap.delete(ns(this).id);
+    ns(this).messageManager.removeMessageListener('sdk/remote/process/message', ns(this).messageReceived);
+    ns(this).messageManager.removeMessageListener('child-process-shutdown', this.destroy);
+    ns(this).messageManager = null;
+  },
+
+  // Returns true if this process is a child process
+  get isRemote() {
+    return ns(this).isRemote;
+  }
+});
+
+// Processes gives an API for enumerating an sending and receiving messages from
+// all processes as well as detecting when a new process starts.
+const Processes = Class({
+  implements: [ EventParent ],
+  extends: EventTarget,
+  initialize: function() {
+    EventParent.prototype.initialize.call(this);
+    ns(this).messageManager = ppmm;
+
+    this.port = new EventTarget();
+    definePort(this, 'sdk/remote/process/message');
+  },
+
+  getById: function(id) {
+    return processMap.get(id);
+  }
+});
+var processes = exports.processes = new Processes();
+
+var frameMap = new Map();
+
+function setFrameProcess(frame, process) {
+  ns(frame).process = process;
+  frames.attachItem(frame);
+}
+
+// Frames display webpages in a process. In the main process every Frame is
+// linked with a <browser> or <iframe> element. 
+const Frame = Class({
+  implements: [ Disposable ],
+  extends: EventTarget,
+  setup: function(id, node) {
+    ns(this).id = id;
+    ns(this).node = node;
+
+    let frameLoader = node.QueryInterface(Ci.nsIFrameLoaderOwner).frameLoader;
+    ns(this).messageManager = frameLoader.messageManager;
+
+    ns(this).messageReceived = messageReceived.bind(this);
+    ns(this).messageManager.addMessageListener('sdk/remote/frame/message', ns(this).messageReceived);
+
+    this.port = new EventTarget();
+    definePort(this, 'sdk/remote/frame/message');
+
+    frameMap.set(ns(this).messageManager, this);
+  },
+
+  dispose: function() {
+    emit(this, 'detach', this);
+    ns(this).messageManager.removeMessageListener('sdk/remote/frame/message', ns(this).messageReceived);
+
+    frameMap.delete(ns(this).messageManager);
+    ns(this).messageManager = null;
+  },
+
+  // Returns the browser or iframe element this frame displays in
+  get frameElement() {
+    return ns(this).node;
+  },
+
+  // Returns the process that this frame loads in
+  get process() {
+    return ns(this).process;
+  },
+
+  // Returns true if this frame is a tab in a main browser window
+  get isTab() {
+    let tab = getTabForBrowser(ns(this).node);
+    return !!tab;
+  }
+});
+
+function managerDisconnected({ subject: manager }) {
+  let frame = frameMap.get(manager);
+  if (frame)
+    frame.destroy();
+}
+system.on('message-manager-disconnect', managerDisconnected);
+
+// Provides an API for enumerating and sending and receiving messages from all
+// Frames
+const FrameList = Class({
+  implements: [ EventParent ],
+  extends: EventTarget,
+  initialize: function() {
+    EventParent.prototype.initialize.call(this);
+    ns(this).messageManager = gmm;
+
+    this.port = new EventTarget();
+    definePort(this, 'sdk/remote/frame/message');
+  },
+
+  // Returns the frame for a browser element
+  getFrameForBrowser: function(browser) {
+    for (let frame of this) {
+      if (frame.frameElement == browser)
+        return frame;
+    }
+    return null;
+  },
+});
+var frames = exports.frames = new FrameList();
+
+// Create the module loader in any existing processes
+ppmm.broadcastAsyncMessage('sdk/remote/process/load', {
+  modulePath: PATH,
+  loaderID,
+  options: childOptions,
+  reason: "broadcast"
+});
+
+// A loader has started in a remote process
+function processLoaderStarted({ target, data }) {
+  if (data.loaderID != loaderID)
+    return;
+
+  if (processMap.has(data.processID)) {
+    console.error("Saw the same process load the same loader twice. This is a bug in the SDK.");
+    return;
+  }
+
+  let process = new Process(data.processID, target, data.isRemote);
+
+  if (pendingFrames.has(data.processID)) {
+    for (let frame of pendingFrames.get(data.processID))
+      setFrameProcess(frame, process);
+    pendingFrames.delete(data.processID);
+  }
+}
+
+// A new process has started
+function processStarted({ target, data: { modulePath } }) {
+  if (modulePath != PATH)
+    return;
+
+  // Have it load a loader if it hasn't already
+  target.sendAsyncMessage('sdk/remote/process/load', {
+    modulePath,
+    loaderID,
+    options: childOptions,
+    reason: "response"
+  });
+}
+
+var pendingFrames = new Map();
+
+// A new frame has been created in the remote process
+function frameAttached({ target, data }) {
+  if (data.loaderID != loaderID)
+    return;
+
+  let frame = new Frame(data.frameID, target);
+
+  let process = processMap.get(data.processID);
+  if (process) {
+    setFrameProcess(frame, process);
+    return;
+  }
+
+  // In some cases frame messages can arrive earlier than process messages
+  // causing us to see a new frame appear before its process. In this case
+  // cache the frame data until we see the process. See bug 1131375.
+  if (!pendingFrames.has(data.processID))
+    pendingFrames.set(data.processID, [frame]);
+  else
+    pendingFrames.get(data.processID).push(frame);
+}
+
+// Wait for new processes and frames
+ppmm.addMessageListener('sdk/remote/process/attach', processLoaderStarted);
+ppmm.addMessageListener('sdk/remote/process/start', processStarted);
+gmm.addMessageListener('sdk/remote/frame/attach', frameAttached);
+
+when(reason => {
+  ppmm.removeMessageListener('sdk/remote/process/attach', processLoaderStarted);
+  ppmm.removeMessageListener('sdk/remote/process/start', processStarted);
+  gmm.removeMessageListener('sdk/remote/frame/attach', frameAttached);
+
+  ppmm.broadcastAsyncMessage('sdk/remote/process/unload', { loaderID, reason });
+});
+
+var remoteModules = new Set();
+
+// Ensures a module is loaded in every child process. It is safe to send 
+// messages to this module immediately after calling this.
+// Pass a module to resolve the id relatively.
+function remoteRequire(id, module = null) {
+  // Resolve relative to calling module if passed
+  if (module)
+    id = moduleResolve(id, module.id);
+  let uri = loaderModule.resolveURI(id, pathMapping);
+
+  // Don't reload the same module
+  if (remoteModules.has(uri))
+    return;
+
+  remoteModules.add(uri);
+  processes.port.emit('sdk/remote/require', uri);
+}
+exports.remoteRequire = remoteRequire;