pandora/static/js/fs.js

268 lines
10 KiB
JavaScript
Raw Normal View History

'use strict';
pandora.fs = (function() {
var that = {
local: {},
downloads: {},
enabled: false,
},
2015-03-21 07:36:16 +00:00
active,
2015-03-21 07:19:53 +00:00
queue = [],
requestedBytes = 100*1024*1024*1024; // 100GB
if(window.webkitRequestFileSystem) {
that.enabled = true;
window.webkitRequestFileSystem(window.PERSISTENT, requestedBytes, function(fs) {
that.fs = fs;
that.fs.root.createReader().readEntries(function(results) {
results.forEach(function(entry) {
if (entry.isFile) {
that.local[entry.name] = entry.toURL();
}
});
});
}, function(e) {
Ox.Log('FS', 'Error:', e);
});
}
2015-03-21 07:36:16 +00:00
function cacheVideo(id, callback) {
active = true;
pandora.api.get({id: id, keys: ['parts']}, function(result) {
var parts = result.data.parts, sizes = [];
downloadPart(0);
function downloadPart(part) {
that.downloadVideoURL(id, pandora.user.ui.videoResolution, part + 1, false, function(result) {
result.progress = 1/parts * (part + result.progress);
that.downloads[id].progress = result.progress;
if (result.cancel) {
that.downloads[id].cancel = result.cancel;
}
if (result.total) {
sizes[part] = result.total;
that.downloads[id].size = Ox.sum(sizes);
}
if (result.url) {
if (part + 1 == parts) {
delete that.downloads[id];
active = false;
if (queue.length) {
2015-03-26 15:32:58 +00:00
var next = queue.shift();
setTimeout(function() {
cacheVideo(next[0], next[1]);
});
2015-03-21 07:36:16 +00:00
}
} else {
downloadPart(part + 1);
}
}
callback && callback(result);
});
}
});
}
that.cacheVideo = function(id, callback) {
if (that.getVideoURL(id, pandora.user.ui.videoResolution, 1) || that.downloads[id]) {
callback({progress: 1});
return;
} else {
that.downloads = that.downloads || {};
that.downloads[id] = {
added: new Date(),
cancel: function() {
},
id: id + '::' + pandora.user.ui.videoResolution,
item: id,
progress: 0,
resolution: pandora.user.ui.videoResolution,
size: 0
};
2015-03-21 07:36:16 +00:00
(active || queue.length)
? queue.push([id, callback])
2015-03-21 07:36:16 +00:00
: cacheVideo(id, callback);
}
2015-03-21 07:19:53 +00:00
};
that.getVideoName = function(id, resolution, part, track) {
return pandora.getVideoURLName(id, resolution, part, track).replace('/', '::');
};
that.removeVideo = function(id, callback) {
if (that.downloads && that.downloads[id] && that.downloads[id].cancel) {
that.downloads[id].cancel();
delete that.downloads[id];
active = false;
if (queue.length) {
2015-03-26 15:32:58 +00:00
var next = queue.shift();
setTimeout(function() {
cacheVideo(next[0], next[1]);
});
}
} else {
pandora.api.get({id: id, keys: ['parts']}, function(result) {
var count = result.data.parts * pandora.site.video.resolutions.length, done = 0;
Ox.range(result.data.parts).forEach(function(part) {
pandora.site.video.resolutions.forEach(function(resolution) {
var name = that.getVideoName(id, resolution, part + 1);
that.fs.root.getFile(name, {create: false}, function(fileEntry) {
// remove existing file
fileEntry.remove(function(e) {
if (that.local[name]) {
delete that.local[name];
}
});
++done == count && callback();
}, function() { // file not found
++done == count && callback();
});
});
});
});
}
};
that.storeBlob = function(blob, name, callback) {
requestQuota(blob.size, function() {
that.fs.root.getFile(name, {create: true}, function(fileEntry) {
fileEntry.createWriter(function(fileWriter) {
fileWriter.onwriteend = function(e) {
that.local[name] = fileEntry.toURL();
callback({progress: 1, url: that.local[name]});
};
fileWriter.onerror = function(event) {
Ox.Log('FS', 'Write failed: ' + event.toString());
callback({progress: -1, event: event});
};
fileWriter.write(blob);
}, function(event) {
callback({progress: -1, event: event});
});
}, function(event) {
callback({progress: -1, event: event});
});
}, function(event) {
callback({progress: -1, event: event});
});
function requestQuota(size, callback, error) {
navigator.webkitPersistentStorage.queryUsageAndQuota(function(usage, quota) {
if (quota - usage < size) {
navigator.webkitPersistentStorage.requestQuota(quota + requestedBytes, function(grantedBytes) {
callback();
}, error);
} else {
callback();
}
});
}
};
that.downloadVideoURL = function(id, resolution, part, track, callback) {
//fixme: would be nice to download videos from subdomains,
// currently throws a cross domain error
var name = that.getVideoName(id, resolution, part, track),
url = '/' + pandora.getVideoURLName(id, resolution, part, track),
blobs = [], blobSize = 5*1024*1024, total;
Ox.Log('FS', 'start downloading', url);
partialDownload(0);
function partialDownload(offset) {
var end = offset + blobSize;
if (total) {
end = Math.min(end, total);
}
Ox.Log('FS', 'download part', url, offset, end);
var xhr = new XMLHttpRequest();
xhr.open('GET', url, true);
xhr.setRequestHeader('Range', 'bytes=' + offset + '-' + end);
xhr.withCredentials = true;
xhr.responseType = 'blob';
xhr.timeout = 1000 * 60 * 5;
xhr.addEventListener('progress', function(event) {
if (event.lengthComputable) {
if (!total) {
var range = xhr.getResponseHeader('Content-Range');
total = Math.round(Ox.last(range.split('/')));
}
var progress = (event.loaded + offset) / total;
callback({
progress: progress,
request: xhr,
total: total,
cancel: function() {
xhr.abort();
}
});
}
});
xhr.addEventListener('load', function() {
blobs.push(xhr.response);
if (offset + blobSize < total) {
partialDownload(offset + blobSize + 1);
} else {
2015-03-26 09:27:58 +00:00
setTimeout(function() {
that.storeBlob(new Blob(blobs), name, callback);
});
}
});
xhr.addEventListener('error', function (event) {
Ox.print('partial download failed. retrying in 1 second');
//fixme. make blobSize smaller if this fails?
setTimeout(function() {
partialDownload(offset);
}, 1000);
});
xhr.addEventListener('abort', function (event) {
callback({progress: -1, event: event});
});
xhr.addEventListener('timeout', function (event) {
Ox.print('partial download, timeout');
setTimeout(function() {
partialDownload(offset);
}, 1000);
});
xhr.send();
}
};
that.getVideos = function(callback) {
var files = {};
that.fs.root.createReader().readEntries(function(results) {
var n = 0;
if (results.length) {
results.forEach(function(fileEntry) {
fileEntry.getMetadata(function(meta) {
var item = fileEntry.name.split('::')[0],
resolution = parseInt(fileEntry.name.split('::')[1].split('p')[0]),
part = parseInt(fileEntry.name.split('::')[1].split('p')[1].split('.')[0]),
key = item + '::' + resolution;
if (!(that.downloads && that.downloads[item])) {
files[key] = Ox.extend(files[key] || {}, {
added: meta.modificationTime,
id: item + '::' + resolution,
item: item,
progress: 1,
resolution: resolution,
size: files[key] ? files[key].size + meta.size: meta.size
});
}
++n == results.length && callback(Ox.values(files).concat(Ox.values(that.downloads)));
});
});
} else {
callback(Ox.values(that.downloads));
}
});
};
that.getVideoURL = function(id, resolution, part, track) {
var name = that.getVideoName(id, resolution, part, track);
return that.local[name];
};
return that;
}());