User Protobuf file

user.proto

syntax = "proto3";

service UserService {
  rpc createUser (User) returns (User) {}
  rpc getUserById (UserId) returns (User) {}
}

message User {
    int32 id = 1;
    string email = 2;
    string username = 3;
    string password = 4;
}

message UserId {
    int32 id = 1;
}