Publish Vulpes Preview 15 sources for desktop, Android and Tundra
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338
gaia/tv_apps/browser/js/historyStore.js
Executable file
338
gaia/tv_apps/browser/js/historyStore.js
Executable file
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/* globals BrowserDB, SyncBrowserDB, SyncManagerBridge */
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'use strict';
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(function(exports){
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const INITIAL_HISTORY_COUNT = 21;
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const DAY_IN_MILLI_SECOND = 86400000;
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// TODO: for the live time history data loading task.
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var HistoryStore = {
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isSynced: false,
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cache: new Map(),
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cacheIndexStartAt: 0,
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cacheIndexEndAt: 0,
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lastDataIndex: null,
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currentFolder: null,
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isHandlingCache: false,
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cacheEventQueue: [],
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reset: function (cb) {
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return new Promise(resolve => {
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this.cache.clear();
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this.cacheIndexStartAt = 0;
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this.cacheIndexEndAt = 0;
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this.lastDataIndex = null;
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this.currentFolder = null;
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this.isHandlingCache = false;
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this.cacheEventQueue = [];
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//IFNDEF_FIREFOX_SYNC
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resolve();
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//ENDIF_FIREFOX_SYNC
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//IFDEF_FIREFOX_SYNC
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SyncManagerBridge.getInfo().then(message => {
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if (message.state === 'enabled' || message.state === 'syncing') {
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this.isSynced = true;
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} else {
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this.isSynced = false;
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}
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resolve();
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});
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//ENDIF_FIREFOX_SYNC
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});
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},
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getByRange: function (start, num, folderId, cb) {
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var self = this;
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function getCaches(){
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var length = (start + num) > self.cache.size ?
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(self.cache.size - start) : (start + num);
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var result = [];
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for(var i = start; i < length; i++) {
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result.push(self.cache.get(i));
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}
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return result;
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}
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if(folderId !== this.currentFolder) {
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this.currentFolder = folderId;
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this.fetchCache().then(() => {
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cb(getCaches());
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});
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} else {
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cb(getCaches());
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}
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},
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//IFDEF_FIREFOX_SYNC
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traverseNextCache: function(cacheIndex) {
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return new Promise(resolve => {
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var traverse = () =>{
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var start = this.cache.get(this.cacheIndexStartAt).timestamp;
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SyncBrowserDB.getHistoryTimestamp(start, 'next', false,
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timestamp => {
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if(timestamp) {
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this.updateCacheByNextHistory(timestamp).then(() => {
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var history = this.cache.get(cacheIndex);
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if(!history) {
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traverse();
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} else {
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resolve(history);
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}
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});
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} else {
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resolve(null);
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}
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}
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);
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};
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traverse();
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});
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},
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//ENDIF_FIREFOX_SYNC
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//IFDEF_FIREFOX_SYNC
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traversePreviousCache: function(cacheIndex) {
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return new Promise(resolve => {
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var traverse = () => {
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var start = this.cache.get(this.cacheIndexEndAt).timestamp;
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SyncBrowserDB.getHistoryTimestamp(start, 'prev', false,
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timestamp => {
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if(timestamp) {
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this.updateCacheByPreviousHistory(timestamp).then(() => {
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var history = this.cache.get(cacheIndex);
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if(!history) {
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traverse();
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} else {
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resolve(history);
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}
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});
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} else {
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this.lastDataIndex = this.cacheIndexEndAt;
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resolve(null);
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}
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}
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);
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};
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traverse();
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});
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},
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//ENDIF_FIREFOX_SYNC
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getCache: function(cacheIndex) {
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return new Promise(resolve => {
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var history = null;
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//IFNDEF_FIREFOX_SYNC
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if(this.cacheIndexStartAt <= cacheIndex <= this.cacheIndexEndAt) {
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resolve(null);
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} else {
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history = this.cache.get(cacheIndex);
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resolve(history);
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}
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//ENDIF_FIREFOX_SYNC
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//IFDEF_FIREFOX_SYNC
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if(cacheIndex < this.cacheIndexStartAt) {
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this.traverseNextCache(cacheIndex).then(history => {
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resolve(history);
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});
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} else if (cacheIndex > this.cacheIndexEndAt) {
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if(this.lastDataIndex && cacheIndex > this.lastDataIndex) {
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resolve(history);
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} else {
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this.traversePreviousCache(cacheIndex).then(history => {
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resolve(history);
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});
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}
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} else {
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history = this.cache.get(cacheIndex);
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resolve(history);
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}
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//ENDIF_FIREFOX_SYNC
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});
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},
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handleCacheEvent: function() {
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if(!this.isHandlingCache) {
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this.isHandlingCache = true;
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var handler = this.cacheEventQueue.shift();
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handler().then(() => {
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this.isHandlingCache = false;
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if(this.cacheEventQueue.length > 0) {
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this.handleCacheEvent();
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}
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});
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}
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},
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getByIndex: function (index, folderId, cb) {
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var handler = () => new Promise(resolve => {
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if(folderId !== this.currentFolder) {
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this.currentFolder = folderId;
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this.fetchCache().then(() => {
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this.getCache(index).then(history => {
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cb(history);
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resolve();
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});
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});
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} else {
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this.getCache(index).then(history => {
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cb(history);
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resolve();
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});
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}
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});
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this.cacheEventQueue.push(handler);
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this.handleCacheEvent();
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},
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fetchCache: function () {
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this.cache.clear();
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this.cacheIndexStartAt = 0;
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this.cacheIndexEndAt = -1;
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this.lastDataIndex = null;
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return new Promise( resolve => {
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if(!this.isSynced) {
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// Get bookmark data from origin indexdDB
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BrowserDB.getHistory(localHistory => {
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localHistory.forEach(history => {
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this.cacheIndexEndAt++;
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this.cache.set(this.cacheIndexEndAt, history);
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});
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this.lastDataIndex = this.cacheIndexEndAt;
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resolve();
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});
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} else {
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//IFNDEF_FIREFOX_SYNC
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resolve();
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//ENDIF_FIREFOX_SYNC
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//IFDEF_FIREFOX_SYNC
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if(!this.currentFolder) {
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// XXX: Ideally we should use Promise.all for
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// SyncBrowserDB.getBookmark and BrowserDB.getBookmarks.
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// But now the implementation of these function are not
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// return Promise.
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SyncBrowserDB.getHistoryTimestamp(Date.now(), 'prev', true,
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timestamp => {
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// We query remote history by parentid for checking if
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// the indexedDB has remote history data. If there is
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// any remote data, we create a folder item to show the
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// synced history.
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if(timestamp) {
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this.cacheIndexEndAt++;
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this.cache.set(this.cacheIndexEndAt, {
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id: 'sync_history',
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title: 'Synced History',
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type: 'folder',
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readOnly: true
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});
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}
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// get bookmark data from origin indexdDB
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BrowserDB.getHistory(localHistory => {
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localHistory.forEach(history => {
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this.cacheIndexEndAt++;
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this.cache.set(this.cacheIndexEndAt, history);
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});
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this.lastDataIndex = this.cacheIndexEndAt;
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resolve();
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});
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}
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);
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} else {
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SyncBrowserDB.getHistory(INITIAL_HISTORY_COUNT, syncHistory => {
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syncHistory.forEach(history => {
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// XXX: the data from firefox sync can't be modified.
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history.readOnly = true;
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this.cacheIndexEndAt++;
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this.cache.set(this.cacheIndexEndAt, history);
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});
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if(syncHistory.length < INITIAL_HISTORY_COUNT) {
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this.lastDataIndex = this.cacheIndexEndAt;
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}
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resolve();
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});
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}
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//ENDIF_FIREFOX_SYNC
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}
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});
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},
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//IFDEF_FIREFOX_SYNC
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updateCacheByNextHistory: function (timestamp) {
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var promise = new Promise(resolve => {
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var start = timestamp,
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end = timestamp + DAY_IN_MILLI_SECOND;
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SyncBrowserDB.getHistoryByTime(start, end, true, true, syncHistory => {
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this.cache.clear();
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this.cacheIndexEndAt = this.cacheIndexStartAt - 1;
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var length = syncHistory.length;
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while(length--) {
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this.cacheIndexStartAt--;
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this.cache.set(this.cacheIndexStartAt, syncHistory[length]);
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}
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resolve();
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});
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});
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return promise;
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},
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//ENDIF_FIREFOX_SYNC
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//IFDEF_FIREFOX_SYNC
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updateCacheByPreviousHistory: function (timestamp) {
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var promise = new Promise(resolve => {
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var start = timestamp - DAY_IN_MILLI_SECOND,
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end = timestamp;
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SyncBrowserDB.getHistoryByTime(start, end, true, true, syncHistory => {
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this.cache.clear();
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this.cacheIndexStartAt = this.cacheIndexEndAt + 1;
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syncHistory.forEach(history => {
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// XXX: the data from firefox sync can't be modified.
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history.readOnly = true;
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this.cacheIndexEndAt++;
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this.cache.set(this.cacheIndexEndAt, history);
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});
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resolve();
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});
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});
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return promise;
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},
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//ENDIF_FIREFOX_SYNC
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removeCache: function (index) {
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if(this.cacheIndexStartAt <= index <= this.cacheIndexEndAt) {
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var value = null;
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for(var i = index; i<this.cacheIndexEndAt; i++) {
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value = this.cache.get(i+1);
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this.cache.set(i, value);
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}
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this.cache.delete(this.cacheIndexEndAt);
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this.cacheIndexEndAt--;
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}
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}
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};
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exports.HistoryStore = HistoryStore;
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})(window);
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