gRPC

gRPC is a google implementation of remote procedure call

The problem space

When you are creating micro web services you need to think about:

API
Data format ( json, xml, binary )
End point format ( e.g. GET /api/v1/user/123/post/456 or POST /api/v1/user/123/post)
Error patterns
Load Balancing
Latency
Scalability
Operability with different languages
Authentication
Logging

This is complicated and time consuming

gRPC allows us to define requests and response for RPC (Remote Procedure Calls) and it handles everything else for you.

Additional features:

On the client it looks like you are directly calling a function on the server:

Server code:

def createUser( User user ) {

}

Client code:

server.createUser( user )

Steps to get this working:

Define message and services using Protobuf
Then use a compiler to generate the code. A client stub is generated which you can use to call the server code. You will need to implement the server service code.

This not to disimilar to CORBA but is much easier to use.

The proto struct schema definition looks like:

Page Author: JD

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