Publish Vulpes Preview 15 sources for desktop, Android and Tundra
Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.
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234
gaia/apps/homescreen/js/datastore.js
Executable file
234
gaia/apps/homescreen/js/datastore.js
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'use strict';
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(function(exports) {
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function Datastore(name) {
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this.name = name;
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}
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Datastore.prototype = {
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/**
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* The name of the datastore
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*/
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name: '',
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/**
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* The version of the indexed database
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*/
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DB_VERSION: 1,
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/**
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* The datastore
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*/
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datastore: null,
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/**
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* The last datastore revision that was synced
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*/
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lastRevision: null,
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/**
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* Our local indexed db where we store our copy of bookmarks
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*/
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db: null,
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get revisionName() {
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return this.name + '_revision';
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},
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get idbName() {
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return this.name + '_mirror';
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},
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get storeName() {
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return this.name + '_store';
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},
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init: function() {
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var revisionString = localStorage.getItem(this.revisionName);
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if (revisionString) {
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this.lastRevision = JSON.parse(revisionString);
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}
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return new Promise((resolve, reject) => {
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var req = window.indexedDB.open(this.idbName, this.DB_VERSION);
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req.onupgradeneeded = this.upgradeSchema.bind(this);
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req.onsuccess = (e) => {
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this.db = e.target.result;
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resolve();
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// Open up the shared datastore
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if (!navigator.getDataStores) {
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console.error('DataStore API is unavailable');
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return;
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}
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navigator.getDataStores(this.name).then((stores) => {
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if (stores.length < 1) {
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console.error(this.name + ' inaccessible');
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return;
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}
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this.datastore = stores[0];
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this.datastore.addEventListener('change',
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this.onChange.bind(this));
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this.synchronise();
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}, (e) => {
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console.error('Error getting datastore', e);
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});
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};
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req.onerror = (e) => {
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console.error('Error opening datastore mirror database', e);
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reject(e);
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};
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});
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},
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upgradeSchema: function(e) {
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var db = e.target.result;
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var fromVersion = e.oldVersion;
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if (fromVersion < 1) {
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var store = db.createObjectStore(this.storeName, { keyPath: 'id' });
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store.createIndex('data', 'data', { unique: false });
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}
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},
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synchronise: function() {
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// Serialise mirror refreshes: overlapping clear/add snapshots erase
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// rows while listeners are reading them.
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this._syncQueue = (this._syncQueue || Promise.resolve()).then(
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() => this._synchronise());
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return this._syncQueue;
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},
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_synchronise: function() {
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return new Promise((resolve, reject) => {
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var cursor = this.datastore.sync(this.lastRevision);
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var self = this;
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function cursorResolve(task) {
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var promises = [];
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switch (task.operation) {
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case 'update':
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case 'add':
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promises.push(self.set(task.data));
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break;
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case 'remove':
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promises.push(self.remove(task.id));
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break;
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case 'clear':
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promises.push(self.clear());
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break;
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case 'done':
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self.updateRevision();
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resolve();
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return;
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}
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promises.push(cursor.next());
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Promise.all(promises).then(
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(results) => {
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cursorResolve(results.pop());
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}, reject);
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}
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cursor.next().then(cursorResolve, reject);
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});
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},
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set: function(data) {
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return new Promise((resolve, reject) => {
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var txn = this.db.transaction([this.storeName], 'readwrite');
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txn.oncomplete = function onComplete(data, resolve) {
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resolve();
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document.dispatchEvent(new CustomEvent(this.name + '-set',
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{ detail: { id: data.id }}));
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}.bind(this, data, resolve);
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txn.onerror = reject;
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try {
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txn.objectStore(this.storeName).put({ id: data.id, data: data });
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} catch(e) {
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console.error('Error putting data in ' + this.idbName + ':', e);
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resolve();
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}
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});
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},
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remove: function(id) {
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return new Promise((resolve, reject) => {
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var txn = this.db.transaction([this.storeName], 'readwrite');
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txn.oncomplete = function onComplete(id, resolve) {
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resolve();
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document.dispatchEvent(new CustomEvent(this.name + '-removed',
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{ detail: { id: id }}));
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}.bind(this, id, resolve);
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txn.onerror = reject;
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try {
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txn.objectStore(this.storeName).delete(id);
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} catch(e) {
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console.error('Error deleting data from ' + this.idbName + ':', e);
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resolve();
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}
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});
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},
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clear: function() {
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return new Promise((resolve, reject) => {
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var txn = this.db.transaction([this.storeName], 'readwrite');
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txn.oncomplete = function onComplete(resolve) {
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resolve();
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document.dispatchEvent(new CustomEvent(this.name + '-cleared'));
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}.bind(this, resolve);
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txn.onerror = reject;
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txn.objectStore(this.storeName).clear();
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});
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},
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updateRevision: function() {
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this.lastRevision = this.datastore.revisionId;
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localStorage.setItem(this.revisionName,
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JSON.stringify(this.lastRevision));
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},
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onChange: function(e) {
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this.synchronise().then(() => {},
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(error) => {
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console.error('Failed to handle ' + this.name + ' change', error);
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});
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},
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get: function(id) {
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return new Promise((resolve, reject) => {
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var txn = this.db.transaction([this.storeName], 'readonly');
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txn.onerror = reject;
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txn.objectStore(this.storeName).get(id).onsuccess =
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(event) => {
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resolve(event.target.result);
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};
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});
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},
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getAll: function(filter = () => true) {
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return new Promise((resolve, reject) => {
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var results = [];
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var txn = this.db.transaction([this.storeName], 'readonly');
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txn.onerror = reject;
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txn.oncomplete = () => { resolve(results); };
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txn.objectStore(this.storeName).openCursor().onsuccess =
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(event) => {
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var cursor = event.target.result;
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if (cursor) {
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if (filter(cursor.value)) {
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results.push(cursor.value);
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}
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cursor.continue();
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}
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};
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});
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}
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};
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exports.Datastore = Datastore;
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}(window));
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