gecko-dev/dom/apps/InterAppMessagePort.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/. */
// TODO Bug 907060 Per off-line discussion, after the MessagePort is done
// at Bug 643325, we will start to refactorize the common logic of both
// Inter-App Communication and Shared Worker. For now, we hope to design an
// MozInterAppMessagePort to meet the timeline, which still follows exactly
// the same interface and semantic as the MessagePort is. In the future,
// we can then align it back to MessagePort with backward compatibility.
"use strict";
const { classes: Cc, interfaces: Ci, utils: Cu, results: Cr } = Components;
Cu.import("resource://gre/modules/Services.jsm");
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
Cu.import("resource://gre/modules/DOMRequestHelper.jsm");
const DEBUG = false;
function debug(aMsg) {
dump("-- InterAppMessagePort: " + Date.now() + ": " + aMsg + "\n");
}
XPCOMUtils.defineLazyServiceGetter(this, "cpmm",
"@mozilla.org/childprocessmessagemanager;1",
"nsIMessageSender");
XPCOMUtils.defineLazyServiceGetter(this, "appsService",
"@mozilla.org/AppsService;1",
"nsIAppsService");
const kMessages = ["InterAppMessagePort:OnMessage",
"InterAppMessagePort:Shutdown"];
function InterAppMessagePort() {
if (DEBUG) debug("InterAppMessagePort()");
};
InterAppMessagePort.prototype = {
__proto__: DOMRequestIpcHelper.prototype,
classDescription: "MozInterAppMessagePort",
classID: Components.ID("{c66e0f8c-e3cb-11e2-9e85-43ef6244b884}"),
contractID: "@mozilla.org/dom/inter-app-message-port;1",
QueryInterface: XPCOMUtils.generateQI([Ci.nsIDOMGlobalPropertyInitializer,
Ci.nsISupportsWeakReference,
Ci.nsIObserver]),
// Ci.nsIDOMGlobalPropertyInitializer implementation.
init: function(aWindow) {
if (DEBUG) debug("Calling init().");
this.initDOMRequestHelper(aWindow, kMessages);
let principal = aWindow.document.nodePrincipal;
this._manifestURL = appsService.getManifestURLByLocalId(principal.appId);
this._pageURL = principal.URI.specIgnoringRef;
// Remove query string.
this._pageURL = this._pageURL.split("?")[0];
this._started = false;
this._closed = false;
this._messageQueue = [];
},
// WebIDL implementation for constructor.
__init: function(aMessagePortID) {
if (DEBUG) {
debug("Calling __init(): aMessagePortID: " + aMessagePortID);
}
this._messagePortID = aMessagePortID;
cpmm.sendAsyncMessage("InterAppMessagePort:Register",
{ messagePortID: this._messagePortID,
manifestURL: this._manifestURL,
pageURL: this._pageURL });
},
// DOMRequestIpcHelper implementation.
uninit: function() {
if (DEBUG) debug("Calling uninit().");
// When the message port is uninitialized, we need to disentangle the
// coupling ports, as if the close() method had been called.
if (this._closed) {
if (DEBUG) debug("close() has been called. Don't need to close again.");
return;
}
this.close();
},
postMessage: function(aMessage) {
if (DEBUG) debug("Calling postMessage().");
if (this._closed) {
if (DEBUG) debug("close() has been called. Cannot post message.");
return;
}
cpmm.sendAsyncMessage("InterAppMessagePort:PostMessage",
{ messagePortID: this._messagePortID,
manifestURL: this._manifestURL,
message: aMessage });
},
start: function() {
// Begin dispatching messages received on the port.
if (DEBUG) debug("Calling start().");
if (this._closed) {
if (DEBUG) debug("close() has been called. Cannot call start().");
return;
}
if (this._started) {
if (DEBUG) debug("start() has been called. Don't need to start again.");
return;
}
// When a port's port message queue is enabled, the event loop must use it
// as one of its task sources.
this._started = true;
while (this._messageQueue.length) {
let message = this._messageQueue.shift();
this._dispatchMessage(message);
}
},
close: function() {
// Disconnecting the port, so that it is no longer active.
if (DEBUG) debug("Calling close().");
if (this._closed) {
if (DEBUG) debug("close() has been called. Don't need to close again.");
return;
}
this._closed = true;
this._messageQueue.length = 0;
// When this method called on a local port that is entangled with another
// port, must cause the user agent to disentangle the coupling ports.
cpmm.sendAsyncMessage("InterAppMessagePort:Unregister",
{ messagePortID: this._messagePortID,
manifestURL: this._manifestURL });
this.removeMessageListeners(kMessages);
},
get onmessage() {
if (DEBUG) debug("Getting onmessage handler.");
return this.__DOM_IMPL__.getEventHandler("onmessage");
},
set onmessage(aHandler) {
if (DEBUG) debug("Setting onmessage handler.");
this.__DOM_IMPL__.setEventHandler("onmessage", aHandler);
// The first time a MessagePort object's onmessage IDL attribute is set,
// the port's message queue must be enabled, as if the start() method had
// been called.
if (this._started) {
if (DEBUG) debug("start() has been called. Don't need to start again.");
return;
}
this.start();
},
_dispatchMessage: function _dispatchMessage(aMessage) {
let wrappedMessage = Cu.cloneInto(aMessage, this._window);
if (DEBUG) {
debug("_dispatchMessage: wrappedMessage: " +
JSON.stringify(wrappedMessage));
}
let event = new this._window
.MozInterAppMessageEvent("message",
{ data: wrappedMessage });
this.__DOM_IMPL__.dispatchEvent(event);
},
receiveMessage: function(aMessage) {
if (DEBUG) debug("receiveMessage: name: " + aMessage.name);
let message = aMessage.json;
if (message.manifestURL != this._manifestURL ||
message.pageURL != this._pageURL ||
message.messagePortID != this._messagePortID) {
if (DEBUG) debug("The message doesn't belong to this page. Returning. " +
uneval(message));
return;
}
switch (aMessage.name) {
case "InterAppMessagePort:OnMessage":
if (this._closed) {
if (DEBUG) debug("close() has been called. Drop the message.");
return;
}
if (!this._started) {
if (DEBUG) debug("Not yet called start(). Queue up the message.");
this._messageQueue.push(message.message);
return;
}
this._dispatchMessage(message.message);
break;
case "InterAppMessagePort:Shutdown":
this.close();
break;
default:
if (DEBUG) debug("Error! Shouldn't fall into this case.");
break;
}
}
};
this.NSGetFactory = XPCOMUtils.generateNSGetFactory([InterAppMessagePort]);