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
|
/* 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 EXPORTED_SYMBOLS = ["SharedDataMap"];
const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
const { EventEmitter } = ChromeUtils.import(
"resource://gre/modules/EventEmitter.jsm"
);
ChromeUtils.defineModuleGetter(
this,
"PromiseUtils",
"resource://gre/modules/PromiseUtils.jsm"
);
const IS_MAIN_PROCESS =
Services.appinfo.processType === Services.appinfo.PROCESS_TYPE_DEFAULT;
ChromeUtils.defineModuleGetter(
this,
"JSONFile",
"resource://gre/modules/JSONFile.jsm"
);
const { XPCOMUtils } = ChromeUtils.import(
"resource://gre/modules/XPCOMUtils.jsm"
);
class SharedDataMap extends EventEmitter {
constructor(sharedDataKey, options = { isParent: IS_MAIN_PROCESS }) {
super();
this._sharedDataKey = sharedDataKey;
this._isParent = options.isParent;
this._isReady = false;
this._readyDeferred = PromiseUtils.defer();
this._data = null;
if (this.isParent) {
// Lazy-load JSON file that backs Storage instances.
XPCOMUtils.defineLazyGetter(this, "_store", () => {
let path = options.path;
let store = null;
if (!path) {
try {
const profileDir = Services.dirsvc.get("ProfD", Ci.nsIFile).path;
path = PathUtils.join(profileDir, `${sharedDataKey}.json`);
} catch (e) {
Cu.reportError(e);
}
}
try {
store = new JSONFile({ path });
} catch (e) {
Cu.reportError(e);
}
return store;
});
} else {
this._syncFromParent();
Services.cpmm.sharedData.addEventListener("change", this);
}
}
async init() {
if (!this._isReady && this.isParent) {
await this._store.load();
this._data = this._store.data;
this._syncToChildren({ flush: true });
this._checkIfReady();
}
}
get sharedDataKey() {
return this._sharedDataKey;
}
get isParent() {
return this._isParent;
}
ready() {
return this._readyDeferred.promise;
}
get(key) {
if (!this._data) {
return null;
}
return this._data[key];
}
set(key, value) {
if (!this.isParent) {
throw new Error(
"Setting values from within a content process is not allowed"
);
}
this._store.data[key] = value;
this._store.saveSoon();
this._syncToChildren();
this._notifyUpdate();
}
// Only used in tests
_deleteForTests(key) {
if (!this.isParent) {
throw new Error(
"Setting values from within a content process is not allowed"
);
}
if (this.has(key)) {
delete this._store.data[key];
this._store.saveSoon();
this._syncToChildren();
this._notifyUpdate();
}
}
has(key) {
return Boolean(this.get(key));
}
/**
* Notify store listeners of updates
* Called both from Main and Content process
*/
_notifyUpdate(process = "parent") {
for (let key of Object.keys(this._data || {})) {
this.emit(`${process}-store-update:${key}`, this._data[key]);
}
}
_syncToChildren({ flush = false } = {}) {
Services.ppmm.sharedData.set(this.sharedDataKey, this._data);
if (flush) {
Services.ppmm.sharedData.flush();
}
}
_syncFromParent() {
this._data = Services.cpmm.sharedData.get(this.sharedDataKey);
this._checkIfReady();
this._notifyUpdate("child");
}
_checkIfReady() {
if (!this._isReady && this._data) {
this._isReady = true;
this._readyDeferred.resolve();
}
}
handleEvent(event) {
if (event.type === "change") {
if (event.changedKeys.includes(this.sharedDataKey)) {
this._syncFromParent();
}
}
}
}
|
