'Join a room!'

@defer.inlineCallbacks
def join_room(self, room_name, sender, joinee):

    self._on_join(room_name, joinee)
    destinations = (yield self.get_servers_for_context(room_name))
    try:
        pdu = Pdu.create_new(context=room_name, pdu_type='sy.room.member', is_state=True, state_key=joinee, content={'membership': 'join'}, origin=self.server_name, destinations=destinations)
        (yield self.replication_layer.send_pdu(pdu))
    except Exception as e:
        logger.exception(e)
