Source code for designate.scheduler.filters.random_filter

# Copyright 2016 Hewlett-Packard Development Company, L.P.
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# under the License.
import random

from oslo_log import log as logging

from designate.scheduler.filters import base
from designate.objects import PoolList

LOG = logging.getLogger(__name__)

[docs]class RandomFilter(base.Filter): """Randomly chooses one of the input pools if there is multiple supplied. .. note:: This should be used as one of the last filters, as it reduces the supplied pool list to one. """ name = 'random' """Name to enable in the ``[designate:central:scheduler].filters`` option list """ def filter(self, context, pools, zone): new_list = PoolList() if len(pools): new_list.append(random.choice(pools)) return new_list else: return pools