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store stream in chunks and continue existing partial downloads if they exist

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This commit is contained in:
j 2015-04-09 15:45:30 +02:00
parent a4e0d78d54
commit 82a6caf4ac
1 changed files with 46 additions and 26 deletions
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72
static/js/fs.js
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@ -65,6 +65,12 @@ pandora.fs = (function() {
});
}
function renameFile(old, name, callback) {
that.fs.root.getFile(old, {}, function(fileEntry) {
fileEntry.moveTo(that.fs.root, name);
}, callback);
}
that.cacheVideo = function(id, callback) {
if (that.getVideoURL(id, pandora.user.ui.videoResolution, 1) || that.downloads[id]) {
callback({progress: 1});
@ -127,10 +133,11 @@ pandora.fs = (function() {
}
};
that.storeBlob = function(blob, name, callback) {
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) {
that.local[name] = fileEntry.toURL();
callback({progress: 1, url: that.local[name]});
@ -167,10 +174,15 @@ pandora.fs = (function() {
//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),
blobs = [], blobSize = 5*1024*1024, total;
Ox.Log('FS', 'start downloading', url);
partialDownload(0);
that.fs.root.getFile(partialName, {create: true}, function(fileEntry) {
fileEntry.getMetadata(function(meta) {
partialDownload(meta.size);
});
});
function partialDownload(offset) {
var end = offset + blobSize;
if (total) {
@ -201,14 +213,18 @@ pandora.fs = (function() {
}
});
xhr.addEventListener('load', function() {
blobs.push(xhr.response);
if (offset + blobSize < total) {
partialDownload(offset + blobSize + 1);
} else {
setTimeout(function() {
that.storeBlob(new Blob(blobs), name, callback);
});
}
var blob = xhr.response;
setTimeout(function() {
that.storeBlob(blob, partialName, function(response) {
if (offset + blobSize < total) {
partialDownload(offset + blobSize + 1);
} else {
renameFile(partialName, name, function() {
callback(response);
});
}
}, true);
});
});
xhr.addEventListener('error', function (event) {
Ox.print('partial download failed. retrying in 1 second');
@ -236,23 +252,27 @@ pandora.fs = (function() {
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
});
}
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));