зеркало из https://github.com/mozilla/gecko-dev.git
58 строки
1.6 KiB
JavaScript
58 строки
1.6 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
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"use strict";
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const asyncStorage = require("resource://devtools/shared/async-storage.js");
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/*
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* asyncStoreHelper wraps asyncStorage so that it is easy to define project
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* specific properties. It is similar to PrefsHelper.
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*
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* e.g.
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* const asyncStore = asyncStoreHelper("r", {a: "_a"})
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* asyncStore.a // => asyncStorage.getItem("r._a")
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* asyncStore.a = 2 // => asyncStorage.setItem("r._a", 2)
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*/
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function asyncStoreHelper(root, mappings) {
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let store = {};
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function getMappingKey(key) {
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return Array.isArray(mappings[key]) ? mappings[key][0] : mappings[key];
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}
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function getMappingDefaultValue(key) {
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return Array.isArray(mappings[key]) ? mappings[key][1] : null;
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}
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Object.keys(mappings).map(key =>
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Object.defineProperty(store, key, {
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async get() {
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const value = await asyncStorage.getItem(
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`${root}.${getMappingKey(key)}`
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);
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return value || getMappingDefaultValue(key);
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},
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set(value) {
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asyncStorage.setItem(`${root}.${getMappingKey(key)}`, value);
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},
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})
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);
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store = new Proxy(store, {
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set(target, property, value, receiver) {
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if (!mappings.hasOwnProperty(property)) {
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throw new Error(`AsyncStore: ${property} is not defined in mappings`);
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}
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Reflect.set(...arguments);
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return true;
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},
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});
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return store;
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}
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module.exports = asyncStoreHelper;
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