Unsafe parsing of error details (trailing metadata) from client-side in GRPC Python

grpc_proto_request_details.py

def maybe_parse_details(e: grpc.RpcError) -> any:
    if "_state" not in e.__dict__ or "trailing_metadata" not in e._state.__dict__:
        return None

    md = dict(e._state.trailing_metadata)
    if "grpc-status-details-bin" not in md:
        return None

    val = md["grpc-status-details-bin"]
    status = status_pb2.Status.FromString(val)
    if len(status.details) != 1:
        return None

    details = status.details[0]
    if details.Is(error_details_pb2.BadRequest.DESCRIPTOR):
        msg = error_details_pb2.BadRequest()
        details.Unpack(msg)
        return msg


try:
    req = user_pb.CreateUserRequest()
    resp = user_stub.CreateUser(req)
except grpc.RpcError as e:
    print(e)
    details = maybe_parse_details(e)
    if details:
        print(details)