How do I represent a UUID in a protobuf message?

Question

I want to attach a UUID to a field in my protobuf User message example.

message User {
  // field containing id as UUID type
  required string email;
  optio         


        

Answer 1

If anything, you want to use string to avoid problems with endianness. Note that a UUID and a MS GUID that have the same string representation (and therefore are the same "id") have, however, different byte-stream order (big-endian vs little-endian). If you use bytes in the protocol to communicate between Java using UUID and C# using System.Guid, you could end up with flipped IDs.