Aws::S3::Errors::BadDigest while trying to store a Tempfile

Question

I have the following snippet:

tempfile = Tempfile.new(export_file.filename)

begin

  tempfile.write(contents)

  file_storage_service.store(export_file.filename, tempfile)

ensure

  tempfile.close!

end

And the

store

method is as follows:

def store(filename, file)

  client = Aws::S3::Client.new(options)

  object = Aws::S3::Object.new(bucket_name, filename, client: client)

  object.upload_file(file)

end

My issue is that I seem to get a

Aws::S3::Errors::BadDigest

error on one of my cloud machines, but locally this works as expected.

I believe the tempfile is unlinked while the

store

method is being called, resulting in AWS comparing two different digests, but I'm not very sure about this. I have Ruby 2.1.6 on both machines, the local one running OS X and the cloud one Linux.

What can I do to fix this? And what's the cause of the problem?

P.S.: I've tried both

close!

and

close

on the tempfile, with the same results.

Answer 1

It seems that S3's upload_file expects a file with the cursor reset. Calling tempfile.rewind just before calling store solves this issue.

Aws::S3::Errors::BadDigest while trying to store a Tempfile

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