Re: [grpc-io] grpc-go: Getting raw bytes from the wire

[Eric Anderson]

You can use the options WithCodec as a client and CustomCodec as a server to change the marshaller. That does mean that you most likely wouldn't use the code generator, since it would be trying to use protobuf.

On Sat, Jun 13, 2015 at 12:46 AM, Samir Bhatt <sbbh...@gmail.com> wrote:

Hi,

Forgive me if this question has an obvious answer. Is there a way to dump the raw protocol buffer bytes from the wire?

Setup: I have a client written in C++ that connects to a gRPC server written in Go. I want the Go server to take the raw bytes from the wire and forward the buffer over a websocket to a javascript webapp which will use protobuf.js to decode.

I'd rather not have grpc-go unmarshal the protobuf message from the c++ client just to marshal the same data to send to the js browser app.

Side note: Can't wait for Fetch or similar to allow for a browser-based gRPC endpoint.

Thanks everyone!

Samir

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[Qi Zhao]

The simple way to achieve this is you can have a revised version of Codec.Unmarshal on server side to achieve this -- let https://github.com/grpc/grpc-go/blob/d6f8134fd2e79a0a2a40f284d5552065fb6a8e3c/rpc_util.go#L71 send your raw bytes to your webapp as Eric already pointed out.

I am not clear about your architect design. If the above approach seems hacky to you, you can abandon the code generated by protobuf code generator and have your own stuff so that you have freedom to construct the counterpart of https://github.com/grpc/grpc-go/blob/master/test/grpc_testing/test.pb.go#L544.

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Thanks,

-Qi