gRPC - Go v1.29 How can I call gRPC method without proto file?

[David Wang]

Hi all,

I develop a gate to transfer message from different clients to micro services. However, I dont want to change my gate when service rpc has been changed. So my client give the method name and protobuf information ([]byte) to gate, the gate dont have the .proto.go file and just want to use this completed information to call the right gRPC method. I cant find the right API to realize it.

Like: client.Conn().Invoke(ctx, {methodName}, {protobuf marshal by client}, bytes)

[Amit Saha]

You will need to make use of server reflection: https://github.com/grpc/grpc-go/blob/master/Documentation/server-reflection-tutorial.md

For server, it’s simple to enable it.

For client (i.e in your gate), have a look at http://google.golang.org/grpc/reflection/grpc_reflection_v1alpha to make use of the reflection feature to lookup methods/construct protobuf messages and others.

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[David Wang]

Thank you!  This is exactly what i need

[Amit Saha]

On 31 May 2021, at 7:18 pm, David Wang <wyk843...@gmail.com> wrote:

Thank you!  This is exactly what i need

Great, if you need help this project https://github.com/fullstorydev/grpcurl/tree/8d7770a962faaed972998574375a554a6576627e/cmd/grpcurl may help you as well.

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