mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-01 06:35:42 +00:00
640 lines
24 KiB
JavaScript
640 lines
24 KiB
JavaScript
/* 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 Cc = Components.classes;
|
|
const Ci = Components.interfaces;
|
|
const Cu = Components.utils;
|
|
const Cr = Components.results;
|
|
|
|
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
|
|
Cu.import("resource://gre/modules/Services.jsm");
|
|
Cu.import("resource://gre/modules/SystemMessagePermissionsChecker.jsm");
|
|
|
|
XPCOMUtils.defineLazyServiceGetter(this, "ppmm",
|
|
"@mozilla.org/parentprocessmessagemanager;1",
|
|
"nsIMessageBroadcaster");
|
|
|
|
XPCOMUtils.defineLazyServiceGetter(this, "gUUIDGenerator",
|
|
"@mozilla.org/uuid-generator;1",
|
|
"nsIUUIDGenerator");
|
|
|
|
XPCOMUtils.defineLazyServiceGetter(this, "powerManagerService",
|
|
"@mozilla.org/power/powermanagerservice;1",
|
|
"nsIPowerManagerService");
|
|
|
|
// Limit the number of pending messages for a given page.
|
|
let kMaxPendingMessages;
|
|
try {
|
|
kMaxPendingMessages = Services.prefs.getIntPref("dom.messages.maxPendingMessages");
|
|
} catch(e) {
|
|
// getIntPref throws when the pref is not set.
|
|
kMaxPendingMessages = 5;
|
|
}
|
|
|
|
const kMessages =["SystemMessageManager:GetPendingMessages",
|
|
"SystemMessageManager:HasPendingMessages",
|
|
"SystemMessageManager:Register",
|
|
"SystemMessageManager:Unregister",
|
|
"SystemMessageManager:Message:Return:OK",
|
|
"SystemMessageManager:AskReadyToRegister",
|
|
"SystemMessageManager:HandleMessagesDone",
|
|
"child-process-shutdown"]
|
|
|
|
function debug(aMsg) {
|
|
// dump("-- SystemMessageInternal " + Date.now() + " : " + aMsg + "\n");
|
|
}
|
|
|
|
|
|
let defaultMessageConfigurator = {
|
|
get safeToSendBeforeRunningApp() {
|
|
return true;
|
|
}
|
|
};
|
|
|
|
const MSG_SENT_SUCCESS = 0;
|
|
const MSG_SENT_FAILURE_PERM_DENIED = 1;
|
|
const MSG_SENT_FAILURE_APP_NOT_RUNNING = 2;
|
|
|
|
// Implementation of the component used by internal users.
|
|
|
|
function SystemMessageInternal() {
|
|
// The set of pages registered by installed apps. We keep the
|
|
// list of pending messages for each page here also.
|
|
this._pages = [];
|
|
|
|
// The set of listeners. This is a multi-dimensional object. The _listeners
|
|
// object itself is a map from manifest ID -> an array mapping proccesses to
|
|
// windows. We do this so that we can track both what processes we have to
|
|
// send system messages to as well as supporting the single-process case
|
|
// where we track windows instead.
|
|
this._listeners = {};
|
|
|
|
this._webappsRegistryReady = false;
|
|
this._bufferedSysMsgs = [];
|
|
|
|
this._cpuWakeLocks = {};
|
|
|
|
this._configurators = {};
|
|
|
|
Services.obs.addObserver(this, "xpcom-shutdown", false);
|
|
Services.obs.addObserver(this, "webapps-registry-start", false);
|
|
Services.obs.addObserver(this, "webapps-registry-ready", false);
|
|
kMessages.forEach(function(aMsg) {
|
|
ppmm.addMessageListener(aMsg, this);
|
|
}, this);
|
|
|
|
Services.obs.notifyObservers(this, "system-message-internal-ready", null);
|
|
}
|
|
|
|
SystemMessageInternal.prototype = {
|
|
|
|
_getMessageConfigurator: function _getMessageConfigurator(aType) {
|
|
debug("_getMessageConfigurator for type: " + aType);
|
|
if (this._configurators[aType] === undefined) {
|
|
let contractID = "@mozilla.org/dom/system-messages/configurator/" + aType + ";1";
|
|
if (contractID in Cc) {
|
|
debug(contractID + " is registered, creating an instance");
|
|
this._configurators[aType] =
|
|
Cc[contractID].createInstance(Ci.nsISystemMessagesConfigurator);
|
|
} else {
|
|
debug(contractID + "is not registered, caching the answer");
|
|
this._configurators[aType] = null;
|
|
}
|
|
}
|
|
return this._configurators[aType] || defaultMessageConfigurator;
|
|
},
|
|
|
|
_cancelCpuWakeLock: function _cancelCpuWakeLock(aPageKey) {
|
|
let cpuWakeLock = this._cpuWakeLocks[aPageKey];
|
|
if (cpuWakeLock) {
|
|
debug("Releasing the CPU wake lock for page key = " + aPageKey);
|
|
cpuWakeLock.wakeLock.unlock();
|
|
cpuWakeLock.timer.cancel();
|
|
delete this._cpuWakeLocks[aPageKey];
|
|
}
|
|
},
|
|
|
|
_acquireCpuWakeLock: function _acquireCpuWakeLock(aPageKey) {
|
|
let cpuWakeLock = this._cpuWakeLocks[aPageKey];
|
|
if (!cpuWakeLock) {
|
|
// We have to ensure the CPU doesn't sleep during the process of the page
|
|
// handling the system messages, so that they can be handled on time.
|
|
debug("Acquiring a CPU wake lock for page key = " + aPageKey);
|
|
cpuWakeLock = this._cpuWakeLocks[aPageKey] = {
|
|
wakeLock: powerManagerService.newWakeLock("cpu"),
|
|
timer: Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer),
|
|
lockCount: 1
|
|
};
|
|
} else {
|
|
// We've already acquired the CPU wake lock for this page,
|
|
// so just add to the lock count and extend the timeout.
|
|
cpuWakeLock.lockCount++;
|
|
}
|
|
|
|
// Set a watchdog to avoid locking the CPU wake lock too long,
|
|
// because it'd exhaust the battery quickly which is very bad.
|
|
// This could probably happen if the app failed to launch or
|
|
// handle the system messages due to any unexpected reasons.
|
|
cpuWakeLock.timer.initWithCallback(function timerCb() {
|
|
debug("Releasing the CPU wake lock because the system messages " +
|
|
"were not handled by its registered page before time out.");
|
|
this._cancelCpuWakeLock(aPageKey);
|
|
}.bind(this), 30000, Ci.nsITimer.TYPE_ONE_SHOT);
|
|
},
|
|
|
|
_releaseCpuWakeLock: function _releaseCpuWakeLock(aPageKey, aHandledCount) {
|
|
let cpuWakeLock = this._cpuWakeLocks[aPageKey];
|
|
if (cpuWakeLock) {
|
|
cpuWakeLock.lockCount -= aHandledCount;
|
|
if (cpuWakeLock.lockCount <= 0) {
|
|
debug("Unlocking the CPU wake lock now that the system messages " +
|
|
"have been successfully handled by its registered page.");
|
|
this._cancelCpuWakeLock(aPageKey);
|
|
}
|
|
}
|
|
},
|
|
|
|
_findPage: function _findPage(aType, aPageURL, aManifestURL) {
|
|
let page = null;
|
|
this._pages.some(function(aPage) {
|
|
if (this._isPageMatched(aPage, aType, aPageURL, aManifestURL)) {
|
|
page = aPage;
|
|
}
|
|
return page !== null;
|
|
}, this);
|
|
return page;
|
|
},
|
|
|
|
sendMessage: function sendMessage(aType, aMessage, aPageURI, aManifestURI, aExtra) {
|
|
// Buffer system messages until the webapps' registration is ready,
|
|
// so that we can know the correct pages registered to be sent.
|
|
if (!this._webappsRegistryReady) {
|
|
this._bufferedSysMsgs.push({ how: "send",
|
|
type: aType,
|
|
msg: aMessage,
|
|
pageURI: aPageURI,
|
|
manifestURI: aManifestURI,
|
|
extra: aExtra });
|
|
return;
|
|
}
|
|
|
|
// Give this message an ID so that we can identify the message and
|
|
// clean it up from the pending message queue when apps receive it.
|
|
let messageID = gUUIDGenerator.generateUUID().toString();
|
|
|
|
debug("Sending " + aType + " " + JSON.stringify(aMessage) +
|
|
" for " + aPageURI.spec + " @ " + aManifestURI.spec +
|
|
'; extra: ' + JSON.stringify(aExtra));
|
|
|
|
let result = this._sendMessageCommon(aType,
|
|
aMessage,
|
|
messageID,
|
|
aPageURI.spec,
|
|
aManifestURI.spec,
|
|
aExtra);
|
|
debug("Returned status of sending message: " + result);
|
|
|
|
// Don't need to open the pages and queue the system message
|
|
// which was not allowed to be sent.
|
|
if (result === MSG_SENT_FAILURE_PERM_DENIED) {
|
|
return;
|
|
}
|
|
|
|
let page = this._findPage(aType, aPageURI.spec, aManifestURI.spec);
|
|
if (page) {
|
|
// Queue this message in the corresponding pages.
|
|
this._queueMessage(page, aMessage, messageID);
|
|
|
|
if (result === MSG_SENT_FAILURE_APP_NOT_RUNNING) {
|
|
// Don't open the page again if we already sent the message to it.
|
|
this._openAppPage(page, aMessage, aExtra);
|
|
}
|
|
}
|
|
},
|
|
|
|
broadcastMessage: function broadcastMessage(aType, aMessage, aExtra) {
|
|
// Buffer system messages until the webapps' registration is ready,
|
|
// so that we can know the correct pages registered to be broadcasted.
|
|
if (!this._webappsRegistryReady) {
|
|
this._bufferedSysMsgs.push({ how: "broadcast",
|
|
type: aType,
|
|
msg: aMessage,
|
|
extra: aExtra });
|
|
return;
|
|
}
|
|
|
|
// Give this message an ID so that we can identify the message and
|
|
// clean it up from the pending message queue when apps receive it.
|
|
let messageID = gUUIDGenerator.generateUUID().toString();
|
|
|
|
debug("Broadcasting " + aType + " " + JSON.stringify(aMessage) +
|
|
'; extra = ' + JSON.stringify(aExtra));
|
|
// Find pages that registered an handler for this type.
|
|
this._pages.forEach(function(aPage) {
|
|
if (aPage.type == aType) {
|
|
let result = this._sendMessageCommon(aType,
|
|
aMessage,
|
|
messageID,
|
|
aPage.uri,
|
|
aPage.manifest,
|
|
aExtra);
|
|
debug("Returned status of sending message: " + result);
|
|
|
|
|
|
// Don't need to open the pages and queue the system message
|
|
// which was not allowed to be sent.
|
|
if (result === MSG_SENT_FAILURE_PERM_DENIED) {
|
|
return;
|
|
}
|
|
|
|
// Queue this message in the corresponding pages.
|
|
this._queueMessage(aPage, aMessage, messageID);
|
|
|
|
if (result === MSG_SENT_FAILURE_APP_NOT_RUNNING) {
|
|
// Open app pages to handle their pending messages.
|
|
this._openAppPage(aPage, aMessage, aExtra);
|
|
}
|
|
}
|
|
}, this);
|
|
},
|
|
|
|
registerPage: function registerPage(aType, aPageURI, aManifestURI) {
|
|
if (!aPageURI || !aManifestURI) {
|
|
throw Cr.NS_ERROR_INVALID_ARG;
|
|
}
|
|
|
|
let pageURL = aPageURI.spec;
|
|
let manifestURL = aManifestURI.spec;
|
|
|
|
// Don't register duplicates for this tuple.
|
|
let page = this._findPage(aType, pageURL, manifestURL);
|
|
if (page) {
|
|
debug("Ignoring duplicate registration of " +
|
|
[aType, pageURL, manifestURL]);
|
|
return;
|
|
}
|
|
|
|
this._pages.push({ type: aType,
|
|
uri: pageURL,
|
|
manifest: manifestURL,
|
|
pendingMessages: [] });
|
|
},
|
|
|
|
_findTargetIndex: function _findTargetIndex(aTargets, aTarget) {
|
|
if (!aTargets || !aTarget) {
|
|
return -1;
|
|
}
|
|
for (let index = 0; index < aTargets.length; ++index) {
|
|
let target = aTargets[index];
|
|
if (target.target === aTarget) {
|
|
return index;
|
|
}
|
|
}
|
|
return -1;
|
|
},
|
|
|
|
_isEmptyObject: function _isEmptyObject(aObj) {
|
|
for (let name in aObj) {
|
|
return false;
|
|
}
|
|
return true;
|
|
},
|
|
|
|
_removeTargetFromListener: function _removeTargetFromListener(aTarget,
|
|
aManifest,
|
|
aRemoveListener,
|
|
aUri) {
|
|
let targets = this._listeners[aManifest];
|
|
if (!targets) {
|
|
return false;
|
|
}
|
|
|
|
let index = this._findTargetIndex(targets, aTarget);
|
|
if (index === -1) {
|
|
return false;
|
|
}
|
|
|
|
if (aRemoveListener) {
|
|
debug("remove the listener for " + aManifest);
|
|
delete this._listeners[aManifest];
|
|
return true;
|
|
}
|
|
|
|
let target = targets[index];
|
|
if (aUri && target.winCounts[aUri] !== undefined &&
|
|
--target.winCounts[aUri] === 0) {
|
|
delete target.winCounts[aUri];
|
|
}
|
|
|
|
if (this._isEmptyObject(target.winCounts)) {
|
|
if (targets.length === 1) {
|
|
// If it's the only one, get rid of this manifest entirely.
|
|
debug("remove the listener for " + aManifest);
|
|
delete this._listeners[aManifest];
|
|
} else {
|
|
// If more than one left, remove this one and leave the rest.
|
|
targets.splice(index, 1);
|
|
}
|
|
}
|
|
return true;
|
|
},
|
|
|
|
receiveMessage: function receiveMessage(aMessage) {
|
|
let msg = aMessage.json;
|
|
|
|
// To prevent the hacked child process from sending commands to parent
|
|
// to manage system messages, we need to check its manifest URL.
|
|
if (["SystemMessageManager:Register",
|
|
"SystemMessageManager:Unregister",
|
|
"SystemMessageManager:GetPendingMessages",
|
|
"SystemMessageManager:HasPendingMessages",
|
|
"SystemMessageManager:Message:Return:OK",
|
|
"SystemMessageManager:HandleMessagesDone"].indexOf(aMessage.name) != -1) {
|
|
if (!aMessage.target.assertContainApp(msg.manifest)) {
|
|
debug("Got message from a child process containing illegal manifest URL.");
|
|
return null;
|
|
}
|
|
}
|
|
|
|
switch(aMessage.name) {
|
|
case "SystemMessageManager:AskReadyToRegister":
|
|
return true;
|
|
break;
|
|
case "SystemMessageManager:Register":
|
|
{
|
|
debug("Got Register from " + msg.uri + " @ " + msg.manifest);
|
|
let uri = msg.uri;
|
|
let targets, index;
|
|
if (!(targets = this._listeners[msg.manifest])) {
|
|
let winCounts = {};
|
|
winCounts[uri] = 1;
|
|
this._listeners[msg.manifest] = [{ target: aMessage.target,
|
|
winCounts: winCounts }];
|
|
} else if ((index = this._findTargetIndex(targets, aMessage.target)) === -1) {
|
|
let winCounts = {};
|
|
winCounts[uri] = 1;
|
|
targets.push({ target: aMessage.target,
|
|
winCounts: winCounts });
|
|
} else {
|
|
let winCounts = targets[index].winCounts;
|
|
if (winCounts[uri] === undefined) {
|
|
winCounts[uri] = 1;
|
|
} else {
|
|
winCounts[uri]++;
|
|
}
|
|
}
|
|
|
|
debug("listeners for " + msg.manifest + " innerWinID " + msg.innerWindowID);
|
|
break;
|
|
}
|
|
case "child-process-shutdown":
|
|
{
|
|
debug("Got child-process-shutdown from " + aMessage.target);
|
|
for (let manifest in this._listeners) {
|
|
// See if any processes in this manifest have this target.
|
|
if (this._removeTargetFromListener(aMessage.target, manifest, true, null)) {
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
case "SystemMessageManager:Unregister":
|
|
{
|
|
debug("Got Unregister from " + aMessage.target + "innerWinID " + msg.innerWindowID);
|
|
this._removeTargetFromListener(aMessage.target, msg.manifest, false, msg.uri);
|
|
break;
|
|
}
|
|
case "SystemMessageManager:GetPendingMessages":
|
|
{
|
|
debug("received SystemMessageManager:GetPendingMessages " + msg.type +
|
|
" for " + msg.uri + " @ " + msg.manifest);
|
|
|
|
// This is a sync call used to return the pending messages for a page.
|
|
// Find the right page to get its corresponding pending messages.
|
|
let page = this._findPage(msg.type, msg.uri, msg.manifest);
|
|
if (!page) {
|
|
return;
|
|
}
|
|
|
|
// Return the |msg| of each pending message (drop the |msgID|).
|
|
let pendingMessages = [];
|
|
page.pendingMessages.forEach(function(aMessage) {
|
|
pendingMessages.push(aMessage.msg);
|
|
});
|
|
|
|
// Clear the pending queue for this page. This is OK since we'll store
|
|
// pending messages in the content process (|SystemMessageManager|).
|
|
page.pendingMessages.length = 0;
|
|
|
|
// Send the array of pending messages.
|
|
aMessage.target
|
|
.sendAsyncMessage("SystemMessageManager:GetPendingMessages:Return",
|
|
{ type: msg.type,
|
|
manifest: msg.manifest,
|
|
uri: msg.uri,
|
|
msgQueue: pendingMessages });
|
|
break;
|
|
}
|
|
case "SystemMessageManager:HasPendingMessages":
|
|
{
|
|
debug("received SystemMessageManager:HasPendingMessages " + msg.type +
|
|
" for " + msg.uri + " @ " + msg.manifest);
|
|
|
|
// This is a sync call used to return if a page has pending messages.
|
|
// Find the right page to get its corresponding pending messages.
|
|
let page = this._findPage(msg.type, msg.uri, msg.manifest);
|
|
if (!page) {
|
|
return false;
|
|
}
|
|
|
|
return page.pendingMessages.length != 0;
|
|
break;
|
|
}
|
|
case "SystemMessageManager:Message:Return:OK":
|
|
{
|
|
debug("received SystemMessageManager:Message:Return:OK " + msg.type +
|
|
" for " + msg.uri + " @ " + msg.manifest);
|
|
|
|
// We need to clean up the pending message since the app has already
|
|
// received it, thus avoiding the re-lanunched app handling it again.
|
|
let page = this._findPage(msg.type, msg.uri, msg.manifest);
|
|
if (page) {
|
|
let pendingMessages = page.pendingMessages;
|
|
for (let i = 0; i < pendingMessages.length; i++) {
|
|
if (pendingMessages[i].msgID === msg.msgID) {
|
|
pendingMessages.splice(i, 1);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
case "SystemMessageManager:HandleMessagesDone":
|
|
{
|
|
debug("received SystemMessageManager:HandleMessagesDone " + msg.type +
|
|
" with " + msg.handledCount + " for " + msg.uri + " @ " + msg.manifest);
|
|
|
|
// A page has finished handling some of its system messages, so we try
|
|
// to release the CPU wake lock we acquired on behalf of that page.
|
|
this._releaseCpuWakeLock(this._createKeyForPage(msg), msg.handledCount);
|
|
break;
|
|
}
|
|
}
|
|
},
|
|
|
|
observe: function observe(aSubject, aTopic, aData) {
|
|
switch (aTopic) {
|
|
case "xpcom-shutdown":
|
|
kMessages.forEach(function(aMsg) {
|
|
ppmm.removeMessageListener(aMsg, this);
|
|
}, this);
|
|
Services.obs.removeObserver(this, "xpcom-shutdown");
|
|
Services.obs.removeObserver(this, "webapps-registry-start");
|
|
Services.obs.removeObserver(this, "webapps-registry-ready");
|
|
ppmm = null;
|
|
this._pages = null;
|
|
this._bufferedSysMsgs = null;
|
|
break;
|
|
case "webapps-registry-start":
|
|
this._webappsRegistryReady = false;
|
|
break;
|
|
case "webapps-registry-ready":
|
|
// After the webapps' registration has been done for sure,
|
|
// re-fire the buffered system messages if there is any.
|
|
this._webappsRegistryReady = true;
|
|
this._bufferedSysMsgs.forEach(function(aSysMsg) {
|
|
switch (aSysMsg.how) {
|
|
case "send":
|
|
this.sendMessage(
|
|
aSysMsg.type, aSysMsg.msg, aSysMsg.pageURI, aSysMsg.manifestURI, aSysMsg.extra);
|
|
break;
|
|
case "broadcast":
|
|
this.broadcastMessage(aSysMsg.type, aSysMsg.msg, aSysMsg.extra);
|
|
break;
|
|
}
|
|
}, this);
|
|
this._bufferedSysMsgs.length = 0;
|
|
break;
|
|
}
|
|
},
|
|
|
|
_queueMessage: function _queueMessage(aPage, aMessage, aMessageID) {
|
|
// Queue the message for this page because we've never known if an app is
|
|
// opened or not. We'll clean it up when the app has already received it.
|
|
aPage.pendingMessages.push({ msg: aMessage, msgID: aMessageID });
|
|
if (aPage.pendingMessages.length > kMaxPendingMessages) {
|
|
aPage.pendingMessages.splice(0, 1);
|
|
}
|
|
},
|
|
|
|
_openAppPage: function _openAppPage(aPage, aMessage, aExtra) {
|
|
// We don't need to send the full object to observers.
|
|
let page = { uri: aPage.uri,
|
|
manifest: aPage.manifest,
|
|
type: aPage.type,
|
|
extra: aExtra,
|
|
target: aMessage.target };
|
|
debug("Asking to open " + JSON.stringify(page));
|
|
Services.obs.notifyObservers(this, "system-messages-open-app", JSON.stringify(page));
|
|
},
|
|
|
|
_isPageMatched: function _isPageMatched(aPage, aType, aPageURI, aManifestURI) {
|
|
return (aPage.type === aType &&
|
|
aPage.manifest === aManifestURI &&
|
|
aPage.uri === aPageURI)
|
|
},
|
|
|
|
_createKeyForPage: function _createKeyForPage(aPage) {
|
|
let converter = Cc["@mozilla.org/intl/scriptableunicodeconverter"]
|
|
.createInstance(Ci.nsIScriptableUnicodeConverter);
|
|
converter.charset = "UTF-8";
|
|
|
|
let hasher = Cc["@mozilla.org/security/hash;1"]
|
|
.createInstance(Ci.nsICryptoHash);
|
|
hasher.init(hasher.SHA1);
|
|
|
|
// add uri and action to the hash
|
|
["type", "manifest", "uri"].forEach(function(aProp) {
|
|
let data = converter.convertToByteArray(aPage[aProp], {});
|
|
hasher.update(data, data.length);
|
|
});
|
|
|
|
return hasher.finish(true);
|
|
},
|
|
|
|
_sendMessageCommon:
|
|
function _sendMessageCommon(aType, aMessage, aMessageID, aPageURI, aManifestURI, aExtra) {
|
|
// Don't send the system message not granted by the app's permissions.
|
|
if (!SystemMessagePermissionsChecker
|
|
.isSystemMessagePermittedToSend(aType,
|
|
aPageURI,
|
|
aManifestURI)) {
|
|
return MSG_SENT_FAILURE_PERM_DENIED;
|
|
}
|
|
|
|
let appPageIsRunning = false;
|
|
let pageKey = this._createKeyForPage({ type: aType,
|
|
manifest: aManifestURI,
|
|
uri: aPageURI });
|
|
|
|
// Tries to send the message to a previously opened app only if it's safe
|
|
// to do so. Generically, it's safe to send the message if the app isn't
|
|
// going to be reloaded. And it's not safe otherwise
|
|
if (this._getMessageConfigurator(aType).safeToSendBeforeRunningApp) {
|
|
|
|
let targets = this._listeners[aManifestURI];
|
|
if (targets) {
|
|
for (let index = 0; index < targets.length; ++index) {
|
|
let target = targets[index];
|
|
// We only need to send the system message to the targets (processes)
|
|
// which contain the window page that matches the manifest/page URL of
|
|
// the destination of system message.
|
|
if (target.winCounts[aPageURI] === undefined) {
|
|
continue;
|
|
}
|
|
|
|
appPageIsRunning = true;
|
|
// We need to acquire a CPU wake lock for that page and expect that
|
|
// we'll receive a "SystemMessageManager:HandleMessagesDone" message
|
|
// when the page finishes handling the system message. At that point,
|
|
// we'll release the lock we acquired.
|
|
this._acquireCpuWakeLock(pageKey);
|
|
|
|
// Multiple windows can share the same target (process), the content
|
|
// window needs to check if the manifest/page URL is matched. Only
|
|
// *one* window should handle the system message.
|
|
let manager = target.target;
|
|
manager.sendAsyncMessage("SystemMessageManager:Message",
|
|
{ type: aType,
|
|
msg: aMessage,
|
|
manifest: aManifestURI,
|
|
uri: aPageURI,
|
|
msgID: aMessageID });
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!appPageIsRunning) {
|
|
// The app page isn't running and relies on the 'open-app' chrome event to
|
|
// wake it up. We still need to acquire a CPU wake lock for that page and
|
|
// expect that we will receive a "SystemMessageManager:HandleMessagesDone"
|
|
// message when the page finishes handling the system message with other
|
|
// pending messages. At that point, we'll release the lock we acquired.
|
|
this._acquireCpuWakeLock(pageKey);
|
|
return MSG_SENT_FAILURE_APP_NOT_RUNNING;
|
|
} else {
|
|
return MSG_SENT_SUCCESS;
|
|
}
|
|
|
|
},
|
|
|
|
classID: Components.ID("{70589ca5-91ac-4b9e-b839-d6a88167d714}"),
|
|
|
|
QueryInterface: XPCOMUtils.generateQI([Ci.nsISystemMessagesInternal, Ci.nsIObserver])
|
|
}
|
|
|
|
this.NSGetFactory = XPCOMUtils.generateNSGetFactory([SystemMessageInternal]);
|