Async RPC methods in protobuf?

[song...@hotmail.com]

I notice that when RPC methods are defined in a proto file, they are all sync APIs. Is there a way to define async methods? Thanks.

[Feng Xiao]

Are you using grpc? You can post grpc related questions to https://groups.google.com/forum/#!forum/grpc-io

On Tue, Nov 15, 2016 at 4:03 PM, <song...@hotmail.com> wrote:

I notice that when RPC methods are defined in a proto file, they are all sync APIs. Is there a way to define async methods? Thanks.

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[song...@hotmail.com]

Thanks for the reply. I am not using gRPC. I want to use protobuf to define RPC, but have a separate or customized transport implementation.

On Tuesday, November 15, 2016 at 4:30:12 PM UTC-8, Feng Xiao wrote:

Are you using grpc? You can post grpc related questions to https://groups.google.com/forum/#!forum/grpc-io

On Tue, Nov 15, 2016 at 4:03 PM, <song...@hotmail.com> wrote:

I notice that when RPC methods are defined in a proto file, they are all sync APIs. Is there a way to define async methods? Thanks.

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[Feng Xiao]

On Tue, Nov 15, 2016 at 4:37 PM, <song...@hotmail.com> wrote:

Thanks for the reply. I am not using gRPC. I want to use protobuf to define RPC, but have a separate or customized transport implementation.

There is no such thing as sync vs. async API in proto definition. It's only relevant in the generated service API. For example, given:

service HelloService {

  rpc Hello(Request) returns (Response);

}

 

You can generate code that provides sync API, or generate code that provides async API:

class HelloService {

 public:

  void Hello(const Request& request, const std::function<void(const Response&)>& result_callback);

}

On Tuesday, November 15, 2016 at 4:30:12 PM UTC-8, Feng Xiao wrote:

Are you using grpc? You can post grpc related questions to https://groups.google.com/forum/#!forum/grpc-io

On Tue, Nov 15, 2016 at 4:03 PM, <song...@hotmail.com> wrote:

I notice that when RPC methods are defined in a proto file, they are all sync APIs. Is there a way to define async methods? Thanks.

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[song...@hotmail.com]

Yes, I agree with you that it is all dependent on the generated code. So does protobuf compiler provide the option to generate async APIs? If not, how complicated will it be to modify the complier?

[Feng Xiao]

On Tue, Nov 15, 2016 at 5:17 PM, <song...@hotmail.com> wrote:

Yes, I agree with you that it is all dependent on the generated code. So does protobuf compiler provide the option to generate async APIs? If not, how complicated will it be to modify the complier?

Protobuf itself doesn't provide the RPC implementation. You can write a protoc plugin to generate RPC code just like how most protobuf-based RPC works:

https://github.com/google/protobuf/blob/master/docs/third_party.md#rpc-implementations

 

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