问题
I am having trouble streaming video with my iOS app from URL of a PFFile uploaded in my database. I used Heroku and AWS and I still have the same issue. It used to work fine when the files were hosted in the old parse server.
the PFFile url works fine when I open it in a chrome web browser but not in safari nor in the iOS app.
the following is the link of the video: http://shuuapp.herokuapp.com/parse/files/wnQeou0L4klDelSEtMOX6SxXRVKu1f3sKl6vg349/24092609eadcc049f711aafbd59c1a18_movie.mp4
Its exactly the same issue as the issue mentioned in the link below:
iOS - Can't stream video from Parse Backend
回答1:
parse-server doesn't seem to be supporting streaming in Safari/iOS and the solution is the enable it using express & GridStore as follows,
parse-server-example\node_modules\parse-server\lib\Routers\FilesRouter
{
key: 'getHandler',
value: function getHandler(req, res, content) {
var config = new _Config2.default(req.params.appId);
var filesController = config.filesController;
var filename = req.params.filename;
var video = '.mp4'
var lastFourCharacters = video.substr(video.length - 4);
if (lastFourCharacters == '.mp4') {
filesController.handleVideoStream(req, res, filename).then(function (data) {
}).catch(function (err) {
console.log('404FilesRouter');
res.status(404);
res.set('Content-Type', 'text/plain');
res.end('File not found.');
});
}else{
filesController.getFileData(config, filename).then(function (data) {
res.status(200);
res.end(data);
}).catch(function (err) {
res.status(404);
res.set('Content-Type', 'text/plain');
res.end('File not found.');
});
}
}
} , ...
parse-server-example\node_modules\parse-server\lib\Controllers\FilesController
_createClass(FilesController, [{
key: 'getFileData',
value: function getFileData(config, filename) {
return this.adapter.getFileData(filename);
}
},{
key: 'handleVideoStream',
value: function handleVideoStream(req, res, filename) {
return this.adapter.handleVideoStream(req, res, filename);
}
}, ...
parse-server-example\node_modules\parse-server\lib\Adapters\Files\GridStoreAdapter
... , {
key: 'handleVideoStream',
value: function handleVideoStream(req, res, filename) {
return this._connect().then(function (database) {
return _mongodb.GridStore.exist(database, filename).then(function () {
var gridStore = new _mongodb.GridStore(database, filename, 'r');
gridStore.open(function(err, GridFile) {
if(!GridFile) {
res.send(404,'Not Found');
return;
}
console.log('filename');
StreamGridFile(GridFile, req, res);
});
});
})
}
}, ...
Bottom of GridStore Adapter
function StreamGridFile(GridFile, req, res) {
var buffer_size = 1024 * 1024;//1024Kb
if (req.get('Range') != null) { //was: if(req.headers['range'])
// Range request, partialle stream the file
console.log('Range Request');
var parts = req.get('Range').replace(/bytes=/, "").split("-");
var partialstart = parts[0];
var partialend = parts[1];
var start = partialstart ? parseInt(partialstart, 10) : 0;
var end = partialend ? parseInt(partialend, 10) : GridFile.length - 1;
var chunksize = (end - start) + 1;
if(chunksize == 1){
start = 0;
partialend = false;
}
if(!partialend){
if(((GridFile.length-1) - start) < (buffer_size) ){
end = GridFile.length - 1;
}else{
end = start + (buffer_size);
}
chunksize = (end - start) + 1;
}
if(start == 0 && end == 2){
chunksize = 1;
}
res.writeHead(206, {
'Cache-Control': 'no-cache',
'Content-Range': 'bytes ' + start + '-' + end + '/' + GridFile.length,
'Accept-Ranges': 'bytes',
'Content-Length': chunksize,
'Content-Type': 'video/mp4',
});
GridFile.seek(start, function () {
// get GridFile stream
var stream = GridFile.stream(true);
var ended = false;
var bufferIdx = 0;
var bufferAvail = 0;
var range = (end - start) + 1;
var totalbyteswanted = (end - start) + 1;
var totalbyteswritten = 0;
// write to response
stream.on('data', function (buff) {
bufferAvail += buff.length;
//Ok check if we have enough to cover our range
if(bufferAvail < range) {
//Not enough bytes to satisfy our full range
if(bufferAvail > 0)
{
//Write full buffer
res.write(buff);
totalbyteswritten += buff.length;
range -= buff.length;
bufferIdx += buff.length;
bufferAvail -= buff.length;
}
}
else{
//Enough bytes to satisfy our full range!
if(bufferAvail > 0) {
var buffer = buff.slice(0,range);
res.write(buffer);
totalbyteswritten += buffer.length;
bufferIdx += range;
bufferAvail -= range;
}
}
if(totalbyteswritten >= totalbyteswanted) {
// totalbytes = 0;
GridFile.close();
res.end();
this.destroy();
}
});
});
}else{
// res.end(GridFile);
// stream back whole file
res.header('Cache-Control', 'no-cache');
res.header('Connection', 'keep-alive');
res.header("Accept-Ranges", "bytes");
res.header('Content-Type', 'video/mp4');
res.header('Content-Length', GridFile.length);
var stream = GridFile.stream(true).pipe(res);
}
};
P.S The original answer is given by @Bragegs here - https://github.com/ParsePlatform/parse-server/issues/1440#issuecomment-212815625 .
来源：https://stackoverflow.com/questions/37016487/cant-stream-video-pffile-from-parse-server