syntax = "proto3";

package streamsvc;

option go_package = "example.com/demo/pb";

message StreamReq {
  string input = 1;
}

message StreamReply {
  string output = 1;
}

service StreamService {
  // ServerStream: client sends one request, server returns a stream of responses.
  rpc ServerStream(StreamReq) returns (stream StreamReply);

  // ClientStream: client sends a stream of requests, server returns one response.
  rpc ClientStream(stream StreamReq) returns (StreamReply);

  // BidiStream: both client and server send streams of messages.
  rpc BidiStream(stream StreamReq) returns (stream StreamReply);
}