496 lines
22 KiB
JavaScript
496 lines
22 KiB
JavaScript
'use strict';
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pandora.fs = (function() {
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var that = {
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local: {},
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downloads: {},
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enabled: false,
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},
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active,
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queue = [],
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requestedBytes = 100*1024*1024*1024; // 100GB
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if(window.webkitRequestFileSystem) {
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that.enabled = true;
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window.webkitRequestFileSystem(window.PERSISTENT, requestedBytes, function(fs) {
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that.fs = fs;
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that.fs.root.createReader().readEntries(function(results) {
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results.forEach(function(entry) {
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if (entry.isFile) {
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if (Ox.startsWith(entry.name, 'partial::')) {
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entry.remove(function() {});
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} else {
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var name = entry.name.split('::'),
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filename = Ox.last(name),
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foldername = name[0] + "::" + filename.split('p')[0];
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var key = foldername[0] + '/' + foldername;
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createTree(key, function(folder) {
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entry.moveTo(folder, filename, function(e) {
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var name = folder.name + '/' + e.name;
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that.local[name] = e.toURL();
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that.storeBlob(new Blob(['ok']), key + '/done', function() {});
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}, function() {
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Ox.print('error moving', filename);
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});
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});
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}
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} else if (entry.isDirectory) {
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entry.createReader().readEntries(function(prefixes) {
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prefixes.forEach(function(prefix) {
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prefix.isDirectory && prefix.createReader().readEntries(function(contents) {
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if (contents.filter(function(e) { return e.name == 'done'}).length) {
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contents.forEach(function(e) {
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if (e.name != 'done') {
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var name = prefix.name + '/' + e.name;
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that.local[name] = e.toURL();
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}
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});
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}
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});
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});
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});
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}
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});
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});
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}, function(e) {
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Ox.Log('FS', 'Error:', e);
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});
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}
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function createTree(folder, callback, root) {
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var parts = folder.split('/');
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root = root || that.fs.root;
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root.getDirectory(parts.shift(), {create: true}, function(folder) {
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if (parts.length) {
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createTree(parts.join('/'), callback, folder);
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} else {
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callback(folder);
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}
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}, function(error) {
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Ox.Log('FS', 'error', error);
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callback();
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});
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}
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function cacheVideo(id, callback) {
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var key = id[0] + '/' + id + '::' + pandora.user.ui.videoResolution;
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active = true;
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createTree(key, function(folder) {
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pandora.api.get({id: id, keys: ['parts']}, function(result) {
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var parts = result.data.parts, sizes = [];
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downloadPart(0);
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function downloadPart(part) {
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var partName = key + '/' + pandora.user.ui.videoResolution
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+ 'p' + (part + 1) + '.' + pandora.user.videoFormat,
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url = that.getVideoURL(id, pandora.user.ui.videoResolution, part + 1);
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if (url) {
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done({url: url});
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} else {
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that.downloadVideoURL(id, pandora.user.ui.videoResolution, part + 1, false, function(result) {
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result.progress = 1/parts * (part + result.progress);
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if (!that.downloads[id]) {
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result.cancel && result.cancel();
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return;
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}
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that.downloads[id].progress = result.progress;
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if (result.cancel) {
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that.downloads[id].cancel = result.cancel;
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}
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if (result.total) {
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sizes[part] = result.total;
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that.downloads[id].size = Ox.sum(sizes);
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}
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if (result.url) {
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done(result);
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} else {
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callback && callback(result);
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}
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});
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}
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function done(result) {
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that.local[partName] = result.url;
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if (part + 1 == parts) {
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//fixme
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that.storeBlob(new Blob(['ok']), key + '/done', function() {
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delete that.downloads[id];
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active = false;
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callback && callback(result);
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if (queue.length) {
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var next = queue.shift();
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setTimeout(function() {
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cacheVideo(next[0], next[1]);
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}, 50);
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}
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});
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} else {
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setTimeout(function() {
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downloadPart(part + 1);
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});
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}
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}
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}
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});
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});
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}
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function renameFile(old, name, callback) {
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that.fs.root.getFile(old, {}, function(fileEntry) {
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fileEntry.moveTo(that.fs.root, name, callback, function(error) {
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Ox.Log('FS', 'failed to move', old, name);
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callback();
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});
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}, function() {
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Ox.Log('FS', 'could not find old file', old, name);
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callback();
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});
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}
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that.cacheVideo = function(id, callback) {
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if (that.getVideoURL(id, pandora.user.ui.videoResolution, 1) || that.downloads[id]) {
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callback && callback({progress: 1});
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return;
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} else {
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that.downloads = that.downloads || {};
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that.downloads[id] = {
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added: new Date(),
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cancel: function() {
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},
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id: id + '::' + pandora.user.ui.videoResolution,
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item: id,
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progress: 0,
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resolution: pandora.user.ui.videoResolution,
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size: 0
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};
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(active || queue.length)
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? queue.push([id, callback])
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: cacheVideo(id, callback);
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}
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};
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that.cacheBlob = function(blob, id, resolution, index, callback) {
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var key = id[0] + '/' + id + '::' + resolution,
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name = that.getVideoName(id, resolution, index);
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createTree(key, function(folder) {
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that.storeBlob(blob, name[0] + '/' + name, function(response) {
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if (response.progress == -1) {
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callback(response);
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} else {
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that.storeBlob(new Blob(['ok']), key + '/done', callback);
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}
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});
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});
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};
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that.getVideoName = function(id, resolution, part, track) {
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return pandora.getVideoURLName(id, resolution, part, track).replace(id + '\/', id + '::' + resolution + '/');
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};
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that.removeVideo = function(id, callback) {
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if (that.downloads && that.downloads[id] && that.downloads[id].cancel) {
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that.downloads[id].cancel();
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delete that.downloads[id];
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}
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// remove legacy files too
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pandora.api.get({id: id, keys: ['parts']}, function(result) {
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var count = result.data.parts * pandora.site.video.resolutions.length, done = 0;
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Ox.range(result.data.parts).forEach(function(part) {
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pandora.site.video.resolutions.forEach(function(resolution) {
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var name = pandora.getVideoURLName(id, resolution, part + 1).replace('/', '::');
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that.fs.root.getFile(name, {create: false}, function(fileEntry) {
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// remove existing file
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fileEntry.remove(function(e) {
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if (that.local[name]) {
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delete that.local[name];
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}
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});
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}, function() { // file not found
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});
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// remove partial file too
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that.fs.root.getFile('partial::' + name, {create: false}, function(fileEntry) {
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fileEntry.remove(function(e) {});
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});
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});
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});
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});
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Ox.parallelForEach(pandora.site.video.resolutions,
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function(resolution, i, resolutions, cb) {
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var key = id + '::' + resolution;
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that.fs.root.getDirectory(key[0] + '/' + key, {create: false}, function(dir) {
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dir.removeRecursively(cb, cb);
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Object.keys(that.local).forEach(function(name) {
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if (Ox.startsWith(name, key)) {
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delete that.local[name];
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}
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});
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cb();
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}, function() {
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cb();
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});
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}, function() {
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callback();
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});
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};
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that.storeBlob = function(blob, name, callback, append) {
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requestQuota(blob.size, function() {
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that.fs.root.getFile(name, {create: true}, function(fileEntry) {
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fileEntry.createWriter(function(fileWriter) {
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append && fileWriter.seek(fileWriter.length);
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fileWriter.onwriteend = function(e) {
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callback({
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progress: 1,
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url: fileEntry.toURL()
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});
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};
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fileWriter.onerror = function(event) {
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Ox.Log('FS', 'Write failed: ' + event.toString());
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callback({progress: -1, event: event});
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};
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fileWriter.write(blob);
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}, function(event) {
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callback({progress: -1, event: event});
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});
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}, function(event) {
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callback({progress: -1, event: event});
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});
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}, function(event) {
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callback({progress: -1, event: event});
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});
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function requestQuota(size, callback, error) {
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navigator.webkitPersistentStorage.queryUsageAndQuota(function(usage, quota) {
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if (quota - usage < size) {
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navigator.webkitPersistentStorage.requestQuota(quota + requestedBytes, function(grantedBytes) {
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callback();
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}, error);
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} else {
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callback();
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}
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});
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}
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};
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that.downloadVideoURL = function(id, resolution, part, track, callback) {
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//fixme: would be nice to download videos from subdomains,
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// currently throws a cross domain error
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var name = that.getVideoName(id, resolution, part, track),
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url = '/' + pandora.getVideoURLName(id, resolution, part, track),
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blobSize = 5*1024*1024, total;
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Ox.Log('FS', 'start downloading', url);
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getSize(url, function(size) {
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Ox.Log('FS', 'HEAD', url, size);
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total = size;
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that.fs.root.getFile(name, {create: false}, function(fileEntry) {
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fileEntry.getMetadata(function(meta) {
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if (meta.size >= total) {
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Ox.Log('FS', 'file exists, done', meta.size, total);
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callback({
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progress: 1,
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total: total,
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url: fileEntry.toURL()
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})
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} else {
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Ox.Log('FS', url, 'resume from', meta.size);
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partialDownload(meta.size);
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}
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});
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}, function() {
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Ox.Log('FS', url, 'new download');
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partialDownload(0);
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});
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});
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function getSize(url, callback) {
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var xhr = new XMLHttpRequest();
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xhr.open('HEAD', url, true);
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xhr.addEventListener('load', function(event) {
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callback(event.total);
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});
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xhr.addEventListener('error', function (event) {
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setTimeout(function() {
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getSize(url, callback);
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}, 1000);
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});
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xhr.addEventListener('abort', function (event) {
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callback({progress: -1, event: event});
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});
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xhr.addEventListener('timeout', function (event) {
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setTimeout(function() {
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getSize(url, callback);
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}, 1000);
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});
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xhr.send();
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}
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function partialDownload(offset) {
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var end = offset + blobSize - 1;
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if (total) {
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end = Math.min(end, total - 1);
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}
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var range = 'bytes=' + offset + '-' + end;
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Ox.Log('FS', 'download part', url, offset, end, total, range);
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var xhr = new XMLHttpRequest();
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xhr.open('GET', url, true);
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xhr.setRequestHeader('Range', range);
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xhr.withCredentials = true;
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xhr.responseType = 'blob';
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xhr.timeout = 1000 * 60 * 5;
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xhr.addEventListener('progress', function(event) {
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if (event.lengthComputable) {
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if (!total) {
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var range = xhr.getResponseHeader('Content-Range');
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total = Math.round(Ox.last(range.split('/')));
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}
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var progress = (event.loaded + offset) / total;
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callback({
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progress: progress,
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total: total,
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cancel: function() {
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xhr.abort();
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active = false;
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if (queue.length) {
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var next = queue.shift();
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setTimeout(function() {
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cacheVideo(next[0], next[1]);
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}, 50);
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}
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}
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});
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}
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});
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xhr.addEventListener('load', function() {
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var blob = xhr.response;
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setTimeout(function() {
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that.storeBlob(blob, name[0] + '/' + name, function(response) {
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if (offset + blob.size < total) {
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partialDownload(offset + blob.size);
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} else {
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callback(response);
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}
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}, true);
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});
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});
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xhr.addEventListener('error', function (event) {
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Ox.print('partial download failed. retrying in 1 second');
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//fixme. make blobSize smaller if this fails?
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setTimeout(function() {
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partialDownload(offset);
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}, 1000);
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});
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xhr.addEventListener('abort', function (event) {
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callback({progress: -1, event: event});
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});
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xhr.addEventListener('timeout', function (event) {
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Ox.print('partial download, timeout');
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setTimeout(function() {
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partialDownload(offset);
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}, 1000);
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});
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xhr.send();
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}
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};
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that.getVideos = function(callback) {
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var files = {};
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that.fs.root.createReader().readEntries(function(results) {
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if (results.length) {
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Ox.parallelForEach(results, function(fileEntry, i, entries, next_entry) {
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if (fileEntry.isFile) {
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if (Ox.startsWith(fileEntry.name, 'partial::')) {
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next_entry();
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} else {
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fileEntry.getMetadata(function(meta) {
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var item = fileEntry.name.split('::')[0],
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resolution = parseInt(fileEntry.name.split('::')[1].split('p')[0]),
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part = parseInt(fileEntry.name.split('::')[1].split('p')[1].split('.')[0]),
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key = item + '::' + resolution;
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if (!(that.downloads && that.downloads[item]
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&& that.downloads[item].resolution == resolution)) {
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files[key] = Ox.extend(files[key] || {}, {
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added: meta.modificationTime,
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id: item + '::' + resolution,
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item: item,
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progress: 1,
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resolution: resolution,
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size: files[key] ? files[key].size + meta.size: meta.size
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});
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}
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next_entry();
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});
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}
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} else if (fileEntry.isDirectory) {
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fileEntry.createReader().readEntries(function(prefixes) {
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if (prefixes.length) {
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Ox.parallelForEach(prefixes, function(prefix, i, prefixes, callback) {
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prefix.createReader().readEntries(function(contents) {
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if (contents.filter(function(f) { return f.name == 'done' }).length) {
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Ox.parallelMap(contents,
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function(e, i, col, callback) {
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e.getMetadata(function(meta) {
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callback(meta);
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});
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}, function(meta) {
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var item = prefix.name.split('::')[0],
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resolution = parseInt(prefix.name.split('::')[1]),
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key = item + '::' + resolution;
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if (!(that.downloads && that.downloads[item]
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&& that.downloads[item].resolution == resolution)) {
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files[key] = Ox.extend(files[key] || {}, {
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added: Ox.min(meta.map(function(m) {
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return m.modificationTime;
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})),
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id: item + '::' + resolution,
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item: item,
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progress: 1,
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resolution: resolution,
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size: Ox.sum(meta.map(function(m) {
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return m.size;
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}))
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});
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}
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callback();
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}
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);
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} else {
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callback();
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}
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});
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}, next_entry);
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} else {
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next_entry();
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}
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});
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} else {
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next_entry();
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}
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}, function() {
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callback(Ox.values(files).concat(Ox.values(that.downloads)));
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});
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} else {
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callback(Ox.values(that.downloads));
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}
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});
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};
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that.getVideoURL = function(id, resolution, part, track) {
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var name = that.getVideoName(id, resolution, part, track);
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return that.local[name];
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};
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that._tree = function(root) {
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root = root || that.fs.root;
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root.createReader().readEntries(function(results) {
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results.forEach(function(entry) {
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if (entry.isFile) {
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Ox.print(entry.fullPath);
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} else {
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that._tree(entry);
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}
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});
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});
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};
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return that;
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}());
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