Grpc-crashcourse.md

Grpc

You have a service written in C++, client A in Android, and client B in Ruby. All clients need to have a grpc Stub component, which handles request/response with grpc server.

protobuf

protobuf is in the core of grpc to define messages and service, and communication (instead of json)

.proto

syntax = "proto3";

message Greeting {
    string first_name = 1;
}

message GreetRequest {
    Greeting = 1;
}

message GreetResponse {
    string result = 1;
}

service GreetService {
    rpc Greet(GreetRequest) returns (GreetResponse) {};
}

advantages

• Bakcward compatibility

API can evolve without breaking existing clients.