services/messages/proto/messages.proto

syntax = "proto3";

package messages;
option go_package = "proto;messages";

service Messages {
  rpc Send(SendRequest) returns (SendResponse);
  rpc List(ListRequest) returns (ListResponse);
  rpc Read(ReadRequest) returns (ReadResponse);
}

message Message {
  string id = 1;
  string to = 2;
  string from = 3;
  string subject = 4;
  string text = 5;
  int64 sent_at = 6;
}

message SendRequest {
  string to = 1;
  string from = 2;
  string subject = 3;
  string text = 4;
}

message SendResponse {}

message ListRequest {
  string user = 1;
}

message ListResponse {
  repeated Message messages = 1;
}

message ReadRequest {
  string id = 1;
}

message ReadResponse {
  Message message = 1;
}