How to implement a file download service in GRPC

Rampradeep Nalluri

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Jul 30, 2019, 7:49:54 PM7/30/19

to golang-nuts

It is easy to pipe a file reader to http.ResponseWriter object using io.copy() when I implement a large file download service over REST. But how do we handle similar requirement with gRPC server to REST client?

what is the standard way?

-Ram

Burak Serdar

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Jul 30, 2019, 8:42:15 PM7/30/19

to Rampradeep Nalluri, golang-nuts

I don't know what the standard way is, but I do something similar
using a grpc stream. You have to deal with breaking the data into
chunks and stream to the grpc server.

You could implement a client-side streaming API to receive the file
via grpc on the receiving side, implement a Write([]byte) method on
the sending side with chunking etc. and use copy().

>
> -Ram
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Rampradeep Nalluri

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Jul 31, 2019, 10:26:08 AM7/31/19

to Burak Serdar, golang-nuts

If we do that clients like browsers or curl can not use the download API directly.

Burak Serdar

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Jul 31, 2019, 10:35:54 AM7/31/19

to Rampradeep Nalluri, golang-nuts

On Wed, Jul 31, 2019 at 8:25 AM Rampradeep Nalluri
<n.ramp...@gmail.com> wrote:
>
> If we do that clients like browsers or curl can not use the download API directly.

True. You would need an API front-end to expose the grpc stream.