148 lines
4.0 KiB
JavaScript
148 lines
4.0 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 {utils: Cu} = Components;
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Cu.import("resource://gre/modules/XPCOMUtils.jsm");
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Cu.import("resource://shield-recipe-client/lib/LogManager.jsm");
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XPCOMUtils.defineLazyModuleGetter(this, "JSONFile", "resource://gre/modules/JSONFile.jsm");
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XPCOMUtils.defineLazyModuleGetter(this, "OS", "resource://gre/modules/osfile.jsm");
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this.EXPORTED_SYMBOLS = ["Storage"];
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const log = LogManager.getLogger("storage");
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let storePromise;
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function loadStorage() {
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if (storePromise === undefined) {
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const path = OS.Path.join(OS.Constants.Path.profileDir, "shield-recipe-client.json");
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const storage = new JSONFile({path});
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storePromise = (async function() {
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await storage.load();
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return storage;
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})();
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}
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return storePromise;
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}
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this.Storage = {
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makeStorage(prefix, sandbox) {
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if (!sandbox) {
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throw new Error("No sandbox passed");
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}
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const storageInterface = {
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/**
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* Sets an item in the prefixed storage.
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* @returns {Promise}
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* @resolves With the stored value, or null.
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* @rejects Javascript exception.
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*/
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getItem(keySuffix) {
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return new sandbox.Promise((resolve, reject) => {
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loadStorage()
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.then(store => {
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const namespace = store.data[prefix] || {};
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const value = namespace[keySuffix] || null;
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resolve(Cu.cloneInto(value, sandbox));
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})
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.catch(err => {
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log.error(err);
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reject(new sandbox.Error());
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});
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});
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},
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/**
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* Sets an item in the prefixed storage.
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* @returns {Promise}
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* @resolves When the operation is completed succesfully
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* @rejects Javascript exception.
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*/
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setItem(keySuffix, value) {
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return new sandbox.Promise((resolve, reject) => {
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loadStorage()
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.then(store => {
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if (!(prefix in store.data)) {
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store.data[prefix] = {};
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}
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store.data[prefix][keySuffix] = Cu.cloneInto(value, {});
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store.saveSoon();
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resolve();
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})
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.catch(err => {
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log.error(err);
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reject(new sandbox.Error());
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});
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});
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},
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/**
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* Removes a single item from the prefixed storage.
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* @returns {Promise}
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* @resolves When the operation is completed succesfully
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* @rejects Javascript exception.
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*/
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removeItem(keySuffix) {
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return new sandbox.Promise((resolve, reject) => {
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loadStorage()
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.then(store => {
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if (!(prefix in store.data)) {
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return;
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}
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delete store.data[prefix][keySuffix];
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store.saveSoon();
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resolve();
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})
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.catch(err => {
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log.error(err);
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reject(new sandbox.Error());
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});
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});
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},
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/**
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* Clears all storage for the prefix.
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* @returns {Promise}
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* @resolves When the operation is completed succesfully
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* @rejects Javascript exception.
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*/
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clear() {
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return new sandbox.Promise((resolve, reject) => {
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return loadStorage()
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.then(store => {
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store.data[prefix] = {};
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store.saveSoon();
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resolve();
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})
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.catch(err => {
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log.error(err);
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reject(new sandbox.Error());
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});
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});
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},
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};
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return Cu.cloneInto(storageInterface, sandbox, {
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cloneFunctions: true,
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});
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},
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/**
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* Clear ALL storage data and save to the disk.
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*/
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clearAllStorage() {
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return loadStorage()
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.then(store => {
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store.data = {};
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store.saveSoon();
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})
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.catch(err => {
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log.error(err);
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});
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},
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};
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