<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def request_type(self):
 """Retrieve the type of the request, by fetching it from `xenon.proto.xenon_pb2`."""

        if self.static and not self.uses_request:
            return getattr(xenon_pb2, 'Empty')

        if not self.uses_request:
            return None

        return getattr(xenon_pb2, self.request_name)