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metamask-extension/app/scripts/lib/local-store.js

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import extension from 'extensionizer';
import log from 'loglevel';
import { checkForError } from './util';
/**
* A wrapper around the extension's storage local API
*/
export default class ExtensionStore {
/**
* @constructor
*/
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constructor() {
this.isSupported = Boolean(extension.storage.local);
if (!this.isSupported) {
log.error('Storage local API not available.');
}
}
/**
* Returns all of the keys currently saved
* @returns {Promise<*>}
*/
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async get() {
if (!this.isSupported) {
return undefined;
}
const result = await this._get();
// extension.storage.local always returns an obj
// if the object is empty, treat it as undefined
if (isEmpty(result)) {
return undefined;
}
return result;
}
/**
* Sets the key in local state
* @param {Object} state - The state to set
* @returns {Promise<void>}
*/
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async set(state) {
return this._set(state);
}
/**
* Returns all of the keys currently saved
* @private
* @returns {Object} the key-value map from local storage
*/
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_get() {
const { local } = extension.storage;
return new Promise((resolve, reject) => {
local.get(null, (/** @type {any} */ result) => {
const err = checkForError();
if (err) {
reject(err);
} else {
resolve(result);
}
});
});
}
/**
* Sets the key in local state
* @param {Object} obj - The key to set
* @returns {Promise<void>}
* @private
*/
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_set(obj) {
const { local } = extension.storage;
return new Promise((resolve, reject) => {
local.set(obj, () => {
const err = checkForError();
if (err) {
reject(err);
} else {
resolve();
}
});
});
}
}
/**
* Returns whether or not the given object contains no keys
* @param {Object} obj - The object to check
* @returns {boolean}
*/
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function isEmpty(obj) {
return Object.keys(obj).length === 0;
}