if key in server:

                address = ipaddress.ip_address(server[key])

                if not check_ip(address):

                    raise ValueError('{} is not accepted!\n'.format(key))

        return True

    def save(self):

        filepath = Path('data') / (self.name.lower() + '.json')

        try:

            with filepath.open(mode='w', encoding='utf-8') as f:

                json.dump(self.__dict__, f, cls=ServerEncoder)

        except Exception as e:

            raise e

    def update_weights(self):

        if self.type not in ('exit', 'relay'):

            raise NotImplementedError

        try:

            data = manager.query('weights', lookup=self.fingerprint)

        except:

            raise NotImplementedError

        if data is not None:

            data = data.relays[0]

        self.mean_consensus_weight = calculate_weight(data.consensus_weight)

        self.mean_exit_probability = calculate_weight(data.exit_probability)

        self.mean_guard_probability = calculate_weight(

            data.guard_probability

        )

        self.mean_middle_probability = calculate_weight(

            data.middle_probability

        )

        self.mean_consensus_weight_fraction = calculate_weight(

            data.consensus_weight_fraction

        )

    def update_flags(self):

        try:

            data = manager.query('details', lookup=self.fingerprint)

        except:

            raise NotImplementedError

        if data is not None:

            self.flags = data.relays[0].flags

        else:

            raise NotImplementedError

    def check_status(self):

        now = datetime.utcnow()

        delta = now - self.last_updated

        if delta.seconds >= 3600:

            self.status = False

        elif delta.seconds >= 600:

            self.status = None