1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
|
/* 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";
module.metadata = {
"stability": "unstable"
};
const { emit } = require('../event/core');
const { omit, merge } = require('../util/object');
const { Class } = require('../core/heritage');
const { method } = require('../lang/functional');
const { getInnerId } = require('../window/utils');
const { EventTarget } = require('../event/target');
const { isPrivate } = require('../private-browsing/utils');
const { getTabForBrowser, getTabForContentWindowNoShim, getBrowserForTab } = require('../tabs/utils');
const { attach, connect, detach, destroy, makeChildOptions } = require('./utils');
const { ensure } = require('../system/unload');
const { on: observe } = require('../system/events');
const { Ci, Cu } = require('chrome');
const { modelFor: tabFor } = require('sdk/model/core');
const { remoteRequire, processes, frames } = require('../remote/parent');
remoteRequire('sdk/content/worker-child');
const workers = new WeakMap();
var modelFor = (worker) => workers.get(worker);
const ERR_DESTROYED = "Couldn't find the worker to receive this message. " +
"The script may not be initialized yet, or may already have been unloaded.";
// a handle for communication between content script and addon code
const Worker = Class({
implements: [EventTarget],
initialize(options = {}) {
ensure(this, 'detach');
let model = {
attached: false,
destroyed: false,
earlyEvents: [], // fired before worker was attached
frozen: true, // document is not yet active
options,
};
workers.set(this, model);
this.on('detach', this.detach);
EventTarget.prototype.initialize.call(this, options);
this.receive = this.receive.bind(this);
this.port = EventTarget();
this.port.emit = this.send.bind(this, 'event');
this.postMessage = this.send.bind(this, 'message');
if ('window' in options) {
let window = options.window;
delete options.window;
attach(this, window);
}
},
// messages
receive(process, id, args) {
let model = modelFor(this);
if (id !== model.id || !model.attached)
return;
args = JSON.parse(args);
if (model.destroyed && args[0] != 'detach')
return;
if (args[0] === 'event')
emit(this.port, ...args.slice(1))
else
emit(this, ...args);
},
send(...args) {
let model = modelFor(this);
if (model.destroyed && args[0] !== 'detach')
throw new Error(ERR_DESTROYED);
if (!model.attached) {
model.earlyEvents.push(args);
return;
}
processes.port.emit('sdk/worker/message', model.id, JSON.stringify(args));
},
// properties
get url() {
let { url } = modelFor(this);
return url;
},
get contentURL() {
return this.url;
},
get tab() {
require('sdk/tabs');
let { frame } = modelFor(this);
if (!frame)
return null;
let rawTab = getTabForBrowser(frame.frameElement);
return rawTab && tabFor(rawTab);
},
toString: () => '[object Worker]',
detach: method(detach),
destroy: method(destroy),
})
exports.Worker = Worker;
attach.define(Worker, function(worker, window) {
let model = modelFor(worker);
if (model.attached)
detach(worker);
let childOptions = makeChildOptions(model.options);
processes.port.emitCPOW('sdk/worker/create', [childOptions], { window });
let listener = (frame, id, url) => {
if (id != childOptions.id)
return;
frames.port.off('sdk/worker/connect', listener);
connect(worker, frame, { id, url });
};
frames.port.on('sdk/worker/connect', listener);
});
connect.define(Worker, function(worker, frame, { id, url }) {
let model = modelFor(worker);
if (model.attached)
detach(worker);
model.id = id;
model.frame = frame;
model.url = url;
// Messages from content -> chrome come through the process message manager
// since that lives longer than the frame message manager
processes.port.on('sdk/worker/event', worker.receive);
model.attached = true;
model.destroyed = false;
model.frozen = false;
model.earlyEvents.forEach(args => worker.send(...args));
model.earlyEvents = [];
emit(worker, 'attach');
});
// unload and release the child worker, release window reference
detach.define(Worker, function(worker) {
let model = modelFor(worker);
if (!model.attached)
return;
processes.port.off('sdk/worker/event', worker.receive);
model.attached = false;
model.destroyed = true;
emit(worker, 'detach');
});
isPrivate.define(Worker, ({ tab }) => isPrivate(tab));
// Something in the parent side has destroyed the worker, tell the child to
// detach, the child will respond when it has detached
destroy.define(Worker, function(worker, reason) {
let model = modelFor(worker);
model.destroyed = true;
if (!model.attached)
return;
worker.send('detach', reason);
});
|
