Can we use Rest and gRPC in together in spring-boot/java application

[Pawan Shriwas]

Hi Guys, 

I there any way where  we can use Rest and gRPC in together in spring-boot/java application. 

Thanks in advance.

[Sanjay Pujare]

Yes, you can use the gRPC client for talking to gRPC services and a REST client for talking to REST services assuming you are talking about client side coexistence.

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[Pawan Shriwas]

I am talking about the case where my spring boot application server which is right now equipped with rest interfaces, I want it to be also equipped with gRPC interfaces for same service layer so that my same micro-service support same service interface for rest and gRCP.

for more understanding i have draw the case below that i need rest and grcp in my application, let me know if that is feasible.

  

[Mahesh Kanote]

Yes, we can do that by running grpc server on different port. 

Thanks,

Mahewj

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[Russell Wu]

I think you can achieve that in many different ways, some options:

1. Add a service controller layer that implements the actual business logic between grpc/rest interface implementations and your DAO.

2. Use envoy to provide a rest proxy in front of grpc service

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[Sanjay Pujare]

Envoy is unnecessary if you run the gRPC server on a different port.

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[Russell Wu]

Oh. I misread the question. I was talking about a scenario where you have a grpc interface already and looking to add a rest interface. My bad. 

[Jörg Hohwiller]

Hi there,

Just in case someone is interested:

I am working an a framework that supports format-agnostic marshalling:

https://github.com/m-m-m/marshall

On top of that there are real Java beans with awesome features and automatic marhsalling:

https://github.com/m-m-m/bean

On top of that you can implement RPC services in an agnostic way with sync/async/reactive support:

https://github.com/m-m-m/rpc

With all that you can implement your server with very little code and on one HTTP/2 port.

Users can invoke your service and choose the format via content-type as JSON, YAML, XML, or ProtoBuf/gRPC.

Also the provided client can support all this with synchronous and asynchronous usage.

All runs in JVM, as well as in the browser cross-compiled as JS/WASM via TeaVM, or cloud-native via GraalVM.

Still a whole lot of work to do but maybe someone here also likes to join in or have a look...

Most promising part of the project however is this one:

https://github.com/m-m-m/ui-api

Yes, I know that we are reinventing the wheel but there are reasons:

https://github.com/m-m-m/mmm/wiki/reinvent-the-wheel

Cheers

  Jörg