syntax = "proto3";

package weather;

message City {
  // See: https://en.wikipedia.org/wiki/ISO_3166-2
  string code = 1;
  string name = 2;
}

message Temperature {
  // See: https://en.wikipedia.org/wiki/ISO_3166-2
  string code = 1;
  int32 current = 2;
}

message CityQuery {
  message Result { repeated City cities = 2; }
}

message GetTemperature { string code = 1; }

message Ping {
  message Ack {}
}

message Forecast {
  string code = 1;
  string date = 2;
  message Result {
    Temperature temperature = 1;
  }
}

service Weather {
  rpc cities(CityQuery) returns (CityQuery.Result);
  rpc get(GetTemperature) returns (stream Temperature);
  // Unsupported at the moment
  rpc ping(stream Ping) returns (Ping.Ack); 
  rpc forecast(stream Forecast) returns (stream Forecast.Result);
}