pandora/static/js/fs.js

368 lines
15 KiB
JavaScript
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'use strict';
pandora.fs = (function() {
var that = {
local: {},
downloads: {},
enabled: false,
},
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active,
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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 && !Ox.startsWith(entry.name, 'partial::')) {
that.local[entry.name] = entry.toURL();
}
});
});
}, function(e) {
Ox.Log('FS', 'Error:', e);
});
}
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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) {
if (that.getVideoURL(id, pandora.user.ui.videoResolution, part + 1)) {
done();
} else {
that.downloadVideoURL(id, pandora.user.ui.videoResolution, part + 1, false, function(result) {
result.progress = 1/parts * (part + result.progress);
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if (!that.downloads[id]) {
result.cancel && result.cancel();
return;
}
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) {
done();
}
callback && callback(result);
});
}
function done() {
if (part + 1 == parts) {
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renamePart(0);
} else {
setTimeout(function() {
downloadPart(part + 1);
});
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}
}
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function renamePart(i) {
var name = that.getVideoName(id, pandora.user.ui.videoResolution, i + 1),
partialName = 'partial::' + name;
renameFile(partialName, name, function(fileEntry) {
if (fileEntry) {
Ox.Log('FS', 'renamed file', partialName, 'to', name);
that.local[name] = fileEntry.toURL();
} else {
Ox.print('rename failed', name);
callback && callback({progress: -1, error: 'rename failed'});
}
if (i + 1 == parts) {
delete that.downloads[id];
active = false;
if (queue.length) {
var next = queue.shift();
setTimeout(function() {
cacheVideo(next[0], next[1]);
}, 50);
}
} else {
renamePart(i + 1);
}
});
}
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}
});
}
function renameFile(old, name, callback) {
that.fs.root.getFile(old, {}, function(fileEntry) {
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fileEntry.moveTo(that.fs.root, name, callback, function(error) {
Ox.Log('FS', 'failed to move', old, name);
callback();
});
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}, function() {
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Ox.Log('FS', 'could not find old file', old, name);
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callback();
});
}
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
};
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(active || queue.length)
? queue.push([id, callback])
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: cacheVideo(id, callback);
}
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};
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];
} 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();
});
// remove partial file too
that.fs.root.getFile('partial::' + name, {create: false}, function(fileEntry) {
fileEntry.remove(function(e) {});
});
});
});
});
}
};
that.storeBlob = function(blob, name, callback, append) {
requestQuota(blob.size, function() {
that.fs.root.getFile(name, {create: true}, function(fileEntry) {
fileEntry.createWriter(function(fileWriter) {
append && fileWriter.seek(fileWriter.length);
fileWriter.onwriteend = function(e) {
callback({
progress: 1,
url: fileEntry.toURL()
});
};
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),
partialName = 'partial::' + name,
url = '/' + pandora.getVideoURLName(id, resolution, part, track),
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blobSize = 5*1024*1024, total;
Ox.Log('FS', 'start downloading', url);
getSize(url, function(size) {
Ox.Log('FS', 'HEAD', url, size);
total = size;
that.fs.root.getFile(partialName, {create: false}, function(fileEntry) {
fileEntry.getMetadata(function(meta) {
if (meta.size >= total) {
Ox.Log('FS', 'file exists, done', meta.size, total);
callback({
progress: 1,
total: total,
url: fileEntry.toURL()
})
} else {
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Ox.Log('FS', url, 'resume from', meta.size);
partialDownload(meta.size);
}
});
}, function() {
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Ox.Log('FS', url, 'new download');
partialDownload(0);
});
});
function getSize(url, callback) {
var xhr = new XMLHttpRequest();
xhr.open('HEAD', url, true);
xhr.addEventListener('load', function(event) {
callback(event.total);
});
xhr.addEventListener('error', function (event) {
setTimeout(function() {
getSize(url, callback);
}, 1000);
});
xhr.addEventListener('abort', function (event) {
callback({progress: -1, event: event});
});
xhr.addEventListener('timeout', function (event) {
setTimeout(function() {
getSize(url, callback);
}, 1000);
});
xhr.send();
}
function partialDownload(offset) {
var end = offset + blobSize - 1;
if (total) {
end = Math.min(end, total - 1);
}
var range = 'bytes=' + offset + '-' + end;
Ox.Log('FS', 'download part', url, offset, end, total, range);
var xhr = new XMLHttpRequest();
xhr.open('GET', url, true);
xhr.setRequestHeader('Range', range);
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();
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active = false;
if (queue.length) {
var next = queue.shift();
setTimeout(function() {
cacheVideo(next[0], next[1]);
}, 50);
}
}
});
}
});
xhr.addEventListener('load', function() {
var blob = xhr.response;
setTimeout(function() {
that.storeBlob(blob, partialName, function(response) {
if (offset + blob.size < total) {
partialDownload(offset + blob.size);
} else {
callback(response);
}
}, true);
});
});
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) {
if (Ox.startsWith(fileEntry.name, 'partial::')) {
++n == results.length && callback(Ox.values(files).concat(Ox.values(that.downloads)));
} else {
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;
}());