How to interrupt while uploading the file in node.js?

Question

I have a code in controller like below:

BASE.APP.post('/uploadFile/:request/:file', function(req, res, next) {

  var url = req.usersession.webipAddress;

  var path = 'uploads/' + req.params.file;

  var formData = new BASE.FormData();
  formData.append('fileNameUnique', req.params.file);
  formData.append('file', BASE.FS.createReadStream(path));
  //  console.log(formData);


  formData.submit(url + '/service/uploadFile/', function(err, response) {
    // console.log(response.statusCode);
    res.send(response.statusCode);

  });
});

I want to interrupt file upload if status == "cancel", is that possible?

What does formData.submit(url + '/service/uploadFile/' does? — Ara Yeressian
– Ara Yeressian, Commented Jul 22, 2016 at 11:27
So, I'd suggest you interrupt from the client if it is a user interrupt, However, if you want to interrupt a stream based upload, simply throw an error!. — Iceman
– Iceman, Commented Jul 25, 2016 at 5:32

Andrei Dolhescu · Accepted Answer · 2016-07-19 13:56:22Z

1

If status == "cancel" try this:

req.pause()
res.status = 400;
res.end('Upload cancelled');

answered Jul 19, 2016 at 13:56

Andrei Dolhescu

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Comments

Iceman · Accepted Answer · 2016-07-25 05:36:42Z

1

I don't know much about the way your code works or your workflow. This is a generic soln that most likely will work. Add more code in the question if you want a more specific soln.

try {
    if (status === 'cancel') {
        throw new Error("Stopping file upload...");
    }
} catch (e) {
    res.end("the upload was cancelled because of error: " + e.toString());
}

answered Jul 25, 2016 at 5:36

Iceman

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Comments

poida · Accepted Answer · 2016-07-26 11:34:14Z

Save the value returned from formData.submit and use that as a handle to call request.abort on.

E.g.

BASE.APP.post('/uploadFile/:request/:file', function(req, res, next) {     

  var formData = new BASE.FormData();
  // ...

  var formSubmitRequest = formData.submit(url + '/service/uploadFile/', function(err, response) {
    res.send(response.statusCode);
  });

  statusChanger.on('status-change', function(status) {
    if (status === "cancel" && formSubmitRequest) {
      formSubmitRequest.abort();
      res.send(524);
    }
  });

}

From https://github.com/form-data/form-data:

For more advanced request manipulations submit() method returns http.ClientRequest object

From https://nodejs.org/api/http.html#http_request_abort:

request.abort()#

Added in: v0.3.8

Marks the request as aborting. Calling this will cause remaining data in the response to be dropped and the socket to be destroyed.

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