CODEWITHSUNDEEP
node.jsstream
RienNeVaPlu͢s
RienNeVaPlu͢s

Reputation: 7632

Abort ReadStream on client connection close

I am trying to send a (huge) file with a limited amount of data passing every second (using TooTallNate/node-throttle):

var fs = require('fs');
var Throttle = require('throttle');
var throttle = new Throttle(64);

throttle.on('data', function(data){
    console.log('send', data.length);
    res.write(data);
});

throttle.on('end', function() {
    console.log('error',arguments);
    res.end();
});

var stream = fs.createReadStream(filePath).pipe(throttle);

If I cancel the download at the clients browser, the stream will just continue until it completly transferred.
I also tested the scenario above with npm node-throttled-stream, same behavour.

How to cancel the stream if the browser closed his request?

Edit:

I am able to obtain the connections close event by using

req.connection.on('close',function(){});

But the stream has neither a destroy nor an end or stop property which I could use to stop the stream from further reading.

I does provide the property pause Doc, but I would rather stop node from reading the whole file than just stopping to recieve the contents (as described in the doc).

Upvotes: 2

Views: 1593

Answers (1)

RienNeVaPlu͢s
RienNeVaPlu͢s

Reputation: 7632

I ended up using the following dirty workaround:

var aborted = false;

stream.on('data', function(chunk){
    if(aborted) return res.end();

    // stream contents
});

req.connection.on('close',function(){
    aborted = true;
    res.end();
});

As mentioned above, this isn't really a nice solution, but it works.
Any other solution would be highly appreciated!

Upvotes: 2

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