gecko/dom/messages/SystemMessageInternal.js

861 lines
31 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");
XPCOMUtils.defineLazyServiceGetter(this, "appsService",
"@mozilla.org/AppsService;1",
"nsIAppsService");
// 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",
"SystemMessageManager:HandleMessageDone",
"child-process-shutdown"];
function debug(aMsg) {
// dump("-- SystemMessageInternal " + Date.now() + " : " + aMsg + "\n");
}
let defaultMessageConfigurator = {
get mustShowRunningApp() {
return false;
}
};
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 URL -> 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 = {};
this._pendingPromises = new Map();
Services.obs.addObserver(this, "xpcom-shutdown", false);
Services.obs.addObserver(this, "webapps-registry-start", false);
Services.obs.addObserver(this, "webapps-registry-ready", false);
Services.obs.addObserver(this, "webapps-clear-data", false);
kMessages.forEach(function(aMsg) {
ppmm.addMessageListener(aMsg, this);
}, this);
Services.obs.notifyObservers(this, "system-message-internal-ready", null);
}
SystemMessageInternal.prototype = {
_getMessageConfigurator: function(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(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(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(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;
},
_findCacheForApp: function(aManifestURL) {
let cache = [];
this._pages.forEach(function(aPage) {
if (aPage.manifestURL === aManifestURL &&
aPage.pendingMessages.length != 0) {
cache.push({ type: aPage.type,
pageURL: aPage.pageURL,
manifestURL: aPage.manifestURL });
}
});
return cache;
},
sendMessage: function(aType, aMessage, aPageURI, aManifestURI, aExtra) {
return new Promise((aResolve, aReject) => {
this.sendMessageInternal(aType, aMessage, aPageURI, aManifestURI, aExtra,
aResolve, aReject);
});
},
sendMessageInternal: function(aType, aMessage, aPageURI, aManifestURI,
aExtra, aResolvePromiseCb, aRejectPromiseCb) {
// 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,
resolvePromiseCb: aResolvePromiseCb,
rejectPromiseCb: aRejectPromiseCb });
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();
let manifestURL = aManifestURI.spec;
let pendingPromise = { resolvePromiseCb: aResolvePromiseCb,
rejectPromiseCb: aRejectPromiseCb,
manifestURL: manifestURL,
counter: 0 };
let pageURLs = [];
if (aPageURI) {
pageURLs.push(aPageURI.spec);
} else {
// Send this message to all the registered pages of the app if |aPageURI|
// is not specified.
for (let i = 0; i < this._pages.length; i++) {
let page = this._pages[i];
if (page.type === aType && page.manifestURL === manifestURL) {
pageURLs.push(page.pageURL);
}
}
}
pageURLs.forEach(function(aPageURL) {
debug("Sending " + aType + " " + JSON.stringify(aMessage) +
" for " + aPageURL + " @ " + manifestURL +
'; extra: ' + JSON.stringify(aExtra));
let result = this._sendMessageCommon(aType,
aMessage,
messageID,
aPageURL,
manifestURL,
aExtra);
debug("Returned status of sending message: " + result);
if (result === MSG_SENT_FAILURE_PERM_DENIED) {
return;
}
// For each page we must receive a confirm.
++pendingPromise.counter;
}, this);
if (pendingPromise.counter) {
this._pendingPromises.set(messageID, pendingPromise);
}
},
broadcastMessage: function(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 Promise.resolve();
}
// 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));
let shouldDispatchFunc = this._getMessageConfigurator(aType).shouldDispatch;
if (!this._pages.length) {
return Promise.resolve();
}
// Find pages that registered a handler for this type.
let promises = [];
for (let i = 0; i < this._pages.length; i++) {
let promise = ((page) => {
return new Promise((resolve, reject) => {
if (page.type !== aType) {
resolve();
return;
}
let doDispatch = () => {
let result = this._sendMessageCommon(aType,
aMessage,
messageID,
page.pageURL,
page.manifestURL,
aExtra);
debug("Returned status of sending message: " + result);
resolve();
};
if ('function' !== typeof shouldDispatchFunc) {
// If the configurator has no 'shouldDispatch' defined,
// always dispatch this message.
doDispatch();
return;
}
shouldDispatchFunc(page.manifestURL, page.pageURL, aType, aMessage, aExtra)
.then(aShouldDispatch => {
if (aShouldDispatch) {
doDispatch();
}
});
});
})(this._pages[i]);
promises.push(promise);
}
return Promise.all(promises);
},
registerPage: function(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,
pageURL: pageURL,
manifestURL: manifestURL,
pendingMessages: [] });
},
refreshCache: function(aChildMM, aManifestURI) {
if (!aManifestURI) {
throw Cr.NS_ERROR_INVALID_ARG;
}
this._refreshCacheInternal(aChildMM, aManifestURI.spec);
},
_refreshCacheInternal: function(aChildMM, aManifestURL) {
let cache = this._findCacheForApp(aManifestURL);
aChildMM.sendAsyncMessage("SystemMessageCache:RefreshCache", cache);
},
_findTargetIndex: function(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(aObj) {
for (let name in aObj) {
return false;
}
return true;
},
_removeTargetFromListener: function(aTarget,
aManifestURL,
aRemoveListener,
aPageURL) {
let targets = this._listeners[aManifestURL];
if (!targets) {
return false;
}
let index = this._findTargetIndex(targets, aTarget);
if (index === -1) {
return false;
}
if (aRemoveListener) {
debug("remove the listener for " + aManifestURL);
delete this._listeners[aManifestURL];
return true;
}
let target = targets[index];
if (aPageURL && target.winCounts[aPageURL] !== undefined &&
--target.winCounts[aPageURL] === 0) {
delete target.winCounts[aPageURL];
}
if (this._isEmptyObject(target.winCounts)) {
if (targets.length === 1) {
// If it's the only one, get rid of the entry of manifest URL entirely.
debug("remove the listener for " + aManifestURL);
delete this._listeners[aManifestURL];
} else {
// If more than one left, remove this one and leave the rest.
targets.splice(index, 1);
}
}
return true;
},
receiveMessage: function(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",
// TODO: fix bug 988142 to re-enable.
// "SystemMessageManager:Unregister",
"SystemMessageManager:GetPendingMessages",
"SystemMessageManager:HasPendingMessages",
"SystemMessageManager:Message:Return:OK",
"SystemMessageManager:HandleMessagesDone",
"SystemMessageManager:HandleMessageDone"].indexOf(aMessage.name) != -1) {
if (!aMessage.target.assertContainApp(msg.manifestURL)) {
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.pageURL + " @ " + msg.manifestURL);
let pageURL = msg.pageURL;
let targets, index;
if (!(targets = this._listeners[msg.manifestURL])) {
let winCounts = {};
winCounts[pageURL] = 1;
this._listeners[msg.manifestURL] = [{ target: aMessage.target,
winCounts: winCounts }];
} else if ((index = this._findTargetIndex(targets,
aMessage.target)) === -1) {
let winCounts = {};
winCounts[pageURL] = 1;
targets.push({ target: aMessage.target,
winCounts: winCounts });
} else {
let winCounts = targets[index].winCounts;
if (winCounts[pageURL] === undefined) {
winCounts[pageURL] = 1;
} else {
winCounts[pageURL]++;
}
}
this._refreshCacheInternal(aMessage.target, msg.manifestURL);
debug("listeners for " + msg.manifestURL +
" innerWinID " + msg.innerWindowID);
break;
}
case "child-process-shutdown":
{
debug("Got child-process-shutdown from " + aMessage.target);
for (let manifestURL in this._listeners) {
// See if any processes in this manifest URL have this target.
this._removeTargetFromListener(aMessage.target,
manifestURL,
true,
null);
this._rejectPendingPromisesFromManifestURL(manifestURL);
}
break;
}
case "SystemMessageManager:Unregister":
{
debug("Got Unregister from " + aMessage.target +
" innerWinID " + msg.innerWindowID);
this._removeTargetFromListener(aMessage.target,
msg.manifestURL,
false,
msg.pageURL);
this._rejectPendingPromisesFromManifestURL(msg.manifestURL);
break;
}
case "SystemMessageManager:GetPendingMessages":
{
debug("received SystemMessageManager:GetPendingMessages " + msg.type +
" for " + msg.pageURL + " @ " + msg.manifestURL);
// 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.pageURL, msg.manifestURL);
if (!page) {
return;
}
// Return the |msg| of each pending message.
let pendingMessages = [];
page.pendingMessages.forEach(function(aMessage) {
pendingMessages.push({ msg: aMessage.msg, msgID: aMessage.msgID });
});
// 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,
manifestURL: msg.manifestURL,
pageURL: msg.pageURL,
msgQueue: pendingMessages });
this._refreshCacheInternal(aMessage.target, msg.manifestURL);
break;
}
case "SystemMessageManager:HasPendingMessages":
{
debug("received SystemMessageManager:HasPendingMessages " + msg.type +
" for " + msg.pageURL + " @ " + msg.manifestURL);
// NB: Sync message SystemMessageManager:HasPendingMessages
// should only be used by in-process app. For out-of-process
// app, SystemMessageCache should be used.
// 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.pageURL, msg.manifestURL);
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.pageURL + " @ " + msg.manifestURL);
// 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.pageURL, msg.manifestURL);
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:HandleMessageDone":
{
debug("received SystemMessageManager:HandleMessageDone " + msg.type +
" with msgID " + msg.msgID + " for " + msg.pageURL +
" @ " + msg.manifestURL + " - promise rejected: " + msg.rejected);
// Maybe this should resolve/reject a pending promise.
if (msg.rejected) {
this._rejectPendingPromises(msg.msgID);
} else {
this._resolvePendingPromises(msg.msgID);
}
// 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), 1);
break;
}
case "SystemMessageManager:HandleMessagesDone":
{
debug("received SystemMessageManager:HandleMessagesDone " + msg.type +
" with " + msg.handledCount + " for " + msg.pageURL +
" @ " + msg.manifestURL);
// 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(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");
Services.obs.removeObserver(this, "webapps-clear-data");
ppmm = null;
this._pages = null;
this._bufferedSysMsgs = null;
this._pendingPromises.clear();
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.sendMessageInternal(
aSysMsg.type, aSysMsg.msg,
aSysMsg.pageURI, aSysMsg.manifestURI, aSysMsg.extra,
aSysMsg.resolvePromiseCb, aSysMsg.rejectPromiseCb);
break;
case "broadcast":
this.broadcastMessage(aSysMsg.type, aSysMsg.msg, aSysMsg.extra);
break;
}
}, this);
this._bufferedSysMsgs.length = 0;
break;
case "webapps-clear-data":
let params =
aSubject.QueryInterface(Ci.mozIApplicationClearPrivateDataParams);
if (!params) {
debug("Error updating registered pages for an uninstalled app.");
return;
}
// Only update registered pages for apps.
if (params.browserOnly) {
return;
}
let manifestURL = appsService.getManifestURLByLocalId(params.appId);
if (!manifestURL) {
debug("Error updating registered pages for an uninstalled app.");
return;
}
for (let i = this._pages.length - 1; i >= 0; i--) {
let page = this._pages[i];
if (page.manifestURL === manifestURL) {
this._pages.splice(i, 1);
debug("Remove " + page.pageURL + " @ " + page.manifestURL +
" from registered pages due to app uninstallation.");
}
}
this._rejectPendingPromisesFromManifestURL(manifestURL);
debug("Finish updating registered pages for an uninstalled app.");
break;
}
},
_queueMessage: function(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(aPage, aMessage, aExtra, aMsgSentStatus) {
// This means the app must be brought to the foreground.
let showApp = this._getMessageConfigurator(aPage.type).mustShowRunningApp;
// We should send the open-app message if the system message was
// not sent, or if it was sent but we should show the app anyway.
if ((aMsgSentStatus === MSG_SENT_SUCCESS) && !showApp) {
return;
}
// This flag means the app must *only* be brought to the foreground
// and we don't need to load the app to handle messages.
let onlyShowApp = (aMsgSentStatus === MSG_SENT_SUCCESS) && showApp;
debug("Asking to open pageURL: " + aPage.pageURL +
", manifestURL: " + aPage.manifestURL + ", type: " + aPage.type +
", target: " + JSON.stringify(aMessage.target) +
", showApp: " + showApp + ", onlyShowApp: " + onlyShowApp +
", extra: " + JSON.stringify(aExtra));
let glue = Cc["@mozilla.org/dom/messages/system-message-glue;1"]
.createInstance(Ci.nsISystemMessageGlue);
if (glue) {
glue.openApp(aPage.pageURL, aPage.manifestURL, aPage.type, aMessage.target,
showApp, onlyShowApp, aExtra);
} else {
debug("Error! The UI glue component is not implemented.");
}
},
_isPageMatched: function(aPage, aType, aPageURL, aManifestURL) {
return (aPage.type === aType &&
aPage.manifestURL === aManifestURL &&
aPage.pageURL === aPageURL);
},
_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 manifest/page URL and action to the hash
["type", "manifestURL", "pageURL"].forEach(function(aProp) {
let data = converter.convertToByteArray(aPage[aProp], {});
hasher.update(data, data.length);
});
return hasher.finish(true);
},
_sendMessageCommon: function(aType, aMessage, aMessageID,
aPageURL, aManifestURL, aExtra) {
// Don't send the system message not granted by the app's permissions.
if (!SystemMessagePermissionsChecker
.isSystemMessagePermittedToSend(aType,
aPageURL,
aManifestURL)) {
return MSG_SENT_FAILURE_PERM_DENIED;
}
// Queue this message in the corresponding pages.
let page = this._findPage(aType, aPageURL, aManifestURL);
if (!page) {
debug("Message " + aType + " is not registered for " +
aPageURL + " @ " + aManifestURL);
return MSG_SENT_FAILURE_PERM_DENIED;
}
this._queueMessage(page, aMessage, aMessageID);
let appPageIsRunning = false;
let pageKey = this._createKeyForPage({ type: aType,
manifestURL: aManifestURL,
pageURL: aPageURL });
let cache = this._findCacheForApp(aManifestURL);
let targets = this._listeners[aManifestURL];
if (targets) {
for (let index = 0; index < targets.length; ++index) {
let target = targets[index];
let manager = target.target;
// Ensure hasPendingMessage cache is refreshed before we open app
manager.sendAsyncMessage("SystemMessageCache:RefreshCache", cache);
// 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[aPageURL] === undefined) {
continue;
}
appPageIsRunning = true;
// We need to acquire a CPU wake lock for that page and expect that
// we'll receive a "SystemMessageManager:HandleMessagesDone" or a
// "SystemMessageManager:HandleMessageDone" 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.
manager.sendAsyncMessage("SystemMessageManager:Message",
{ type: aType,
msg: aMessage,
manifestURL: aManifestURL,
pageURL: aPageURL,
msgID: aMessageID });
}
}
let result = MSG_SENT_SUCCESS;
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"
// or a "SystemMessageManager:HandleMessageDone" message when the page
// finishes handling the system message with other pending messages. At
// that point, we'll release the lock we acquired.
result = MSG_SENT_FAILURE_APP_NOT_RUNNING;
this._acquireCpuWakeLock(pageKey);
}
this._openAppPage(page, aMessage, aExtra, result);
return result;
},
_resolvePendingPromises: function(aMessageID) {
if (!this._pendingPromises.has(aMessageID)) {
debug("Unknown pendingPromise messageID. This seems a bug!!");
return;
}
let obj = this._pendingPromises.get(aMessageID);
if (!--obj.counter) {
obj.resolvePromiseCb();
this._pendingPromises.delete(aMessageID);
}
},
_rejectPendingPromises: function(aMessageID) {
if (!this._pendingPromises.has(aMessageID)) {
debug("Unknown pendingPromise messageID. This seems a bug!!");
return;
}
let obj = this._pendingPromises.get(aMessageID);
if (!--obj.counter) {
obj.rejectPromiseCb();
this._pendingPromises.delete(aMessageID);
}
},
_rejectPendingPromisesFromManifestURL: function(aManifestURL) {
for (var [i, obj] of this._pendingPromises) {
if (obj.manifestURL == aManifestURL) {
obj.rejectPromiseCb();
this._pendingPromises.delete(i);
}
}
},
classID: Components.ID("{70589ca5-91ac-4b9e-b839-d6a88167d714}"),
QueryInterface: XPCOMUtils.generateQI([Ci.nsISystemMessagesInternal,
Ci.nsIObserver])
}
this.NSGetFactory = XPCOMUtils.generateNSGetFactory([SystemMessageInternal]);