node.py 文件源码

def refresh(self):
        """Refresh the region controller."""
        # XXX ltrager 2016-05-25 - MAAS doesn't have an RPC method between
        # region controllers. If this method refreshes a foreign region
        # controller the foreign region controller will contain the running
        # region's hardware and networking information.
        if self.system_id != get_maas_id():
            raise NotImplementedError(
                'Can only refresh the running region controller')

        try:
            with NamedLock('refresh'):
                token = yield deferToDatabase(self._get_token_for_controller)
                yield deferToDatabase(self._signal_start_of_refresh)
                sys_info = yield deferToThread(get_sys_info)
                yield deferToDatabase(self._process_sys_info, sys_info)
                yield deferToThread(
                    refresh, self.system_id, token.consumer.key, token.key,
                    token.secret)
        except NamedLock.NotAvailable:
            # Refresh already running.
            pass