def save_last_sync(self, ids, process):
        try:
            spec = {'_id': 'last_sync'}
            document = {'$set': {process: ids}}
            self.db.internal.update(spec, document, upsert=True)
        except Exception as e:
            raise DatabaseException(e)
def encode(self):
        return {"rx_sw_if_index": self._rx_index,
                "tx_sw_if_index": self._tx_index, "nh": self._nh_addr}