blob: b24d56e62914071cd4d2e1874b6db16c9b3d09f5 (
plain)
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
|
/* 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 asyncStorage = require("resource://devtools/shared/async-storage.js");
/*
* asyncStoreHelper wraps asyncStorage so that it is easy to define project
* specific properties. It is similar to PrefsHelper.
*
* e.g.
* const asyncStore = asyncStoreHelper("r", {a: "_a"})
* asyncStore.a // => asyncStorage.getItem("r._a")
* asyncStore.a = 2 // => asyncStorage.setItem("r._a", 2)
*/
function asyncStoreHelper(root, mappings) {
let store = {};
function getMappingKey(key) {
return Array.isArray(mappings[key]) ? mappings[key][0] : mappings[key];
}
function getMappingDefaultValue(key) {
return Array.isArray(mappings[key]) ? mappings[key][1] : null;
}
Object.keys(mappings).map(key =>
Object.defineProperty(store, key, {
async get() {
const value = await asyncStorage.getItem(
`${root}.${getMappingKey(key)}`
);
return value || getMappingDefaultValue(key);
},
set(value) {
asyncStorage.setItem(`${root}.${getMappingKey(key)}`, value);
},
})
);
store = new Proxy(store, {
set(target, property) {
if (!mappings.hasOwnProperty(property)) {
throw new Error(`AsyncStore: ${property} is not defined in mappings`);
}
Reflect.set(...arguments);
return true;
},
});
return store;
}
module.exports = asyncStoreHelper;
|
