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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 { merge } = require('../util/object');
const { Class } = require('../core/heritage');
const { emit } = require('../event/core');
const { EventTarget } = require('../event/target');
const { getInnerId, getByInnerId } = require('../window/utils');
const { instanceOf, isObject } = require('../lang/type');
const system = require('../system/events');
const { when } = require('../system/unload');
const { WorkerSandbox } = require('./sandbox');
const { Ci } = require('chrome');
const { process, frames } = require('../remote/child');
const EVENTS = {
'chrome-page-shown': 'pageshow',
'content-page-shown': 'pageshow',
'chrome-page-hidden': 'pagehide',
'content-page-hidden': 'pagehide',
'inner-window-destroyed': 'detach',
}
// The parent Worker must have been created (or an async message sent to spawn
// its creation) before creating the WorkerChild or messages from the content
// script to the parent will get lost.
const WorkerChild = Class({
implements: [EventTarget],
initialize(options) {
merge(this, options);
keepAlive.set(this.id, this);
this.windowId = getInnerId(this.window);
if (this.contentScriptOptions)
this.contentScriptOptions = JSON.parse(this.contentScriptOptions);
this.port = EventTarget();
this.port.on('*', this.send.bind(this, 'event'));
this.on('*', this.send.bind(this));
this.observe = this.observe.bind(this);
for (let topic in EVENTS)
system.on(topic, this.observe);
this.receive = this.receive.bind(this);
process.port.on('sdk/worker/message', this.receive);
this.sandbox = WorkerSandbox(this, this.window);
// If the document has an unexpected readyState, its worker-child instance is initialized
// as frozen until one of the known readyState is reached.
let initialDocumentReadyState = this.window.document.readyState;
this.frozen = [
"loading", "interactive", "complete"
].includes(initialDocumentReadyState) ? false : true;
if (this.frozen) {
console.warn("SDK worker-child started as frozen on unexpected initial document.readyState", {
initialDocumentReadyState, windowLocation: this.window.location.href,
});
}
this.frozenMessages = [];
this.on('pageshow', () => {
this.frozen = false;
this.frozenMessages.forEach(args => this.sandbox.emit(...args));
this.frozenMessages = [];
});
this.on('pagehide', () => {
this.frozen = true;
});
},
// messages
receive(process, id, args) {
if (id !== this.id)
return;
args = JSON.parse(args);
if (this.frozen)
this.frozenMessages.push(args);
else
this.sandbox.emit(...args);
if (args[0] === 'detach')
this.destroy(args[1]);
},
send(...args) {
process.port.emit('sdk/worker/event', this.id, JSON.stringify(args, exceptions));
},
// notifications
observe({ type, subject }) {
if (!this.sandbox)
return;
if (subject.defaultView && getInnerId(subject.defaultView) === this.windowId) {
this.sandbox.emitSync(EVENTS[type]);
emit(this, EVENTS[type]);
}
if (type === 'inner-window-destroyed' &&
subject.QueryInterface(Ci.nsISupportsPRUint64).data === this.windowId) {
this.destroy();
}
},
get frame() {
return frames.getFrameForWindow(this.window.top);
},
// detach/destroy: unload and release the sandbox
destroy(reason) {
if (!this.sandbox)
return;
for (let topic in EVENTS)
system.off(topic, this.observe);
process.port.off('sdk/worker/message', this.receive);
this.sandbox.destroy(reason);
this.sandbox = null;
keepAlive.delete(this.id);
this.send('detach');
}
})
exports.WorkerChild = WorkerChild;
// Error instances JSON poorly
function exceptions(key, value) {
if (!isObject(value) || !instanceOf(value, Error))
return value;
let _errorType = value.constructor.name;
let { message, fileName, lineNumber, stack, name } = value;
return { _errorType, message, fileName, lineNumber, stack, name };
}
// workers for windows in this tab
var keepAlive = new Map();
process.port.on('sdk/worker/create', (process, options, cpows) => {
options.window = cpows.window;
let worker = new WorkerChild(options);
let frame = frames.getFrameForWindow(options.window.top);
frame.port.emit('sdk/worker/connect', options.id, options.window.location.href);
});
when(reason => {
for (let worker of keepAlive.values())
worker.destroy(reason);
});
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