grpc/tools/distrib/python/grpcio_tools/grpc_tools/simple.proto

syntax = "proto3";

message SimpleMessage {
  string msg = 1;
  oneof personal_or_business {
    bool personal = 2;
    bool business = 3;
  };
};

message SimpleMessageRequest {
  SimpleMessage simple_msg = 1;
};

message SimpleMessageResponse {
  bool understood = 1;
};

service SimpleMessageService {
  rpc Tell(SimpleMessageRequest) returns (SimpleMessageResponse);
};