Get readable stream from drive.files.get - node.js

Question

I am writing a nodejs function to transfer files from google drive to some other place
Following is the sample code block to get file from drive
var fileId = '0BwwA4oUTeiV1UVNwOHItT0xfa2M';
var dest = fs.createWriteStream('/tmp/photo.jpg');
drive.files.get({
fileId: fileId,
alt: 'media'
})
.on('end', function () {
console.log('Done');
})
.on('error', function (err) {
console.log('Error during download', err);
})
.pipe(dest);
instead of piping it to writable stream , I would like to get a readable stream that i can pass on to my function
uploadsomeplace(readableStream)
Update 1
i wrote a function to get that readable stream and upload it again to some folder in google drive (seems dumb but for test as drive.files.creates takes a readable stream)
const transferit = async () => {
var fileId = '0BwwA4oUTe1UVNwOHItT0xfa2M' // some valid id
let somereadstream = drive.files.get(
{ fileId, alt: 'media' },
{ responseType: 'stream' }
)
var folderId = '1oC90HZDLbfYiW2neSCMERHZ8ZH1X' // some valid id
var fileMetadata = {
name: 'photo.jpg',
parents: [folderId]
}
var media = {
mimeType: 'image/jpeg',
// body: fs.createReadStream('image.jpg')
body: somereadstream
}
return await drive.files.create({
resource: fileMetadata,
media: media
// fields: 'id'
})
}
transferit().then(data => console.log(data))
but i get error
(node:6200) UnhandledPromiseRejectionWarning: TypeError: part.body.pipe is not a function

Answer 1

drive.files.get returns a promise which if fulfilled gives a response object which contains the readable stream in response.data
const isStream = require('is-stream')
const transferit = async () => {
var fileId = '1uw5PhBF8z8uBsxmFKJef582Pp92UKpxM' // some valid id
let somereadstream = await drive.files.get(
{ fileId, alt: 'media' },
{ responseType: 'stream' }
)
console.log(somereadstream)
return isStream.readable(somereadstream.data)
}

Answer 2

By the looks of things
drive.files.get({
fileId: fileId,
alt: 'media'
})
already returns a readable stream. Just assign it to a variable and pass it into your function.
const readableStream = drive.files.get({
fileId: fileId,
alt: 'media'
});
uploadsomeplace(readableStream);

Answer 3

This works for me in typescript:
async function getReadableStreamForFileId(
drive: drive_v3.Drive,
fileId: FileId,
): Promise<stream.Readable> {
console.log('getReadableStreamForFileId', {drive, fileId});
// https://developers.google.com/drive/api/v3/manage-downloads#node.js
return (await drive.files.get(
{fileId, alt: 'media'},
{responseType: 'stream'},
)).data as any as Promise<stream.Readable>;
}
example:
const fileId = '1F2*******************xGC';
const fileDataStream = await getReadableStreamForFileId(drive, fileId);
const target = fs.createWriteStream('data-out');
fileDataStream.pipe(target);
drive is initialized as described in https://developers.google.com/drive/api/v3/quickstart/nodejs