openDownloadStreamByName returns 0B file

[bondzi]

I'm trying to migrate the large files from my MongoDB to S3 and found this script.

However, when I run it, I have issue with the following part.

function readFileFromMongo (file) { return gridFs.openDownloadStreamByName(file.filename) }

This openDownloadStreamByName (and also openDownloadStream), is returning the stream to me in the following format:

GridFSBucketReadStream
{ s: { bytesRead: 0, chunks: { s: {...} }, cursor: null, expected: 0, files: { s: {...} }, filter: { filename: "test_file.pdf", }, init: false, expectedEnd: 0, file: null, options: { sort: { uploadDate: -1, }, skip: null, start: undefined, end: undefined, }, readPreference: undefined, }, _readableState: { objectMode: false, highWaterMark: 16384, buffer: { head: null, tail: null, length: 0, }, length: 0, pipes: [ ], flowing: null, ended: false, endEmitted: false, reading: false, constructed: true, sync: true, needReadable: false, emittedReadable: false, readableListening: false, resumeScheduled: false, errorEmitted: false, emitClose: true, autoDestroy: true, destroyed: false, errored: null, closed: false, closeEmitted: false, defaultEncoding: "utf8", awaitDrainWriters: null, multiAwaitDrain: false, readingMore: false, dataEmitted: false, decoder: null, encoding: null, }, _events: { }, _eventsCount: 0, _maxListeners: undefined, }

When I try to upload this file with s3.upload function, I get nothing, like it's not calling.

This are the params I'm passing to the upload function:
{ ACL: "public-read", Bucket: "migration-mongodb-documents-storage", Key: "test_file.pdf", Body: { s: { bytesRead: 0, chunks: { s: {...} }, cursor: null, expected: 0, files: { s: {...} }, filter: { filename: "test_file.pdf", }, init: false, expectedEnd: 0, file: null, options: { sort: { uploadDate: -1, }, skip: null, start: undefined, end: undefined, }, readPreference: undefined, }, _readableState: { objectMode: false, highWaterMark: 16384, buffer: { head: null, tail: null, length: 0, }, length: 0, pipes: [ ], flowing: null, ended: false, endEmitted: false, reading: false, constructed: true, sync: true, needReadable: false, emittedReadable: false, readableListening: false, resumeScheduled: false, errorEmitted: false, emitClose: true, autoDestroy: true, destroyed: false, errored: null, closed: false, closeEmitted: false, defaultEncoding: "utf8", awaitDrainWriters: null, multiAwaitDrain: false, readingMore: false, dataEmitted: false, decoder: null, encoding: null, }, _events: { }, _eventsCount: 0, _maxListeners: undefined, }, ContentType: "binary/octet-stream", }

Am I doing something wrong?

[davimacedo]

What happens when you run the script? Would you mind to share the output?