syntax = "proto3";

package addsvc;

service Add {
  rpc Sum (SumRequest) returns (SumReply) {}
  rpc Concat (ConcatRequest) returns (ConcatReply) {}
}

message SumRequest {
  int64 a = 1;
  int64 b = 2;
}

message SumReply {
  int64 v = 1;
  string err = 2;
}

message ConcatRequest {
  string a = 1;
  string b = 2;
}

message ConcatReply {
  string v = 1;
  string err = 2;
}