Get image width and height from stream

Hi! Thanks for an excellent module!

I’m trying to read image width and height from a stream, but nothing happens. In the code below nothing is printed to console. If I remove .pipe(metaReader) the response is printed etc.

What am I missing?

    const request = require('request')
    const sharp = require('sharp')

    let image

    const metaReader = sharp()
      .on('info', info => {
        image = info
      })
      .on('error', err => {
        console.log(err)
      })

    request
      .get('https://images-na.ssl-images-amazon.com/images/M/MV5BMTUyMjM2NTgwNl5BMl5BanBnXkFtZTgwMTUzOTUwMjI@._V1_SX1777_CR0,0,1777,999_AL_.jpg')
      .pipe(metaReader)
      .on('response', function(response) {
        console.log(response) // 200
      })
      .on('error', err => {
        console.log(err)
      })
      .on('end', () => {
        console.log('end')
      })

[lovell]

You’ll need to tell metaReader what to do. If you’re expecting metadata about the input image then try something like (untested):

const metaReader = sharp()
  .metadata()
  .then(info => {
    console.log(info)
  })
  .catch(err => {
    console.log(err)
  })

[lovell]

Sorry, missed your question (too many GH notifications)… you should be able to get away with passing a truncated Buffer with only the header to read image dimensions, but watch out for things like large ICC profiles that can be part of the header. Hope this helps.