node.js - Upload Progress — Request

Question

I'm uploading a file using Request.

req = request.post url: "http://foo.com", body: fileAsBuffer, (err, res, body) ->
    console.log "Uploaded!"

How do I know how much data has actually been uploaded? Is there some event that I can subscribe to or is there a property of the request that I can poll?

If none, what would be the best approach to upload data and know how much has been uploaded?

Answer 1

I spent a couple of hours to find anything valid in request and node sources, and finally found a different approach, which feels more correct to me.

We can rely on drain event and bytesWritten property:

request.put({
  url: 'https://example.org/api/upload',
  body: fs.createReadStream(path)
}).on('drain', () => {
  console.log(req.req.connection.bytesWritten);
});

Alternatively if you need to handle progress of file bytes, it's easier to use stream data event:

let size = fs.lstatSync(path).size;
let bytes = 0;

request.put({
  url: 'https://example.org/api/upload',
  body: fs.createReadStream(path).on('data', (chunk) => {
    console.log(bytes += chunk.length, size);
  })
});

Stream buffer size is 65536 bytes and read/drain procedure runs iteratively.

This seems to be working pretty well for me with node v4.5.0 and request v2.74.0.