Golang io.copy twice on the request body

Question

I am building a blob storage system and i picked Go as the programming language. I create a stream to do a multipart file upload from client to the blob server.

The stre

Answer 1

I would suggest using an io.TeeReader if you want to push all reads from the blob through the sha1 concurrently.

bodyReader := io.TeeReader(body, hash)

Now as the bodyReader is consumed during upload, the hash is automatically updated.