Source code for designate.scheduler.filters.in_doubt_default_pool_filter

# Copyright 2017 SAP SE
# 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
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from oslo_config import cfg

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

               help="The name of the default pool"),
], group='service:central')

[docs]class InDoubtDefaultPoolFilter(base.Filter): """If the previous filter(s) didn't make a clear selection of one pool and if the default pool is in the set of multiple pools, this filter will select the default pool. This filter will pass through the pool list, if there are one or less pools available to schedule to, or if the default pool is not in the set of multiple pools. .. note:: This should be used as one of the last filters. """ name = 'in_doubt_default_pool' """Name to enable in the ``[designate:central:scheduler].filters`` option list """ def filter(self, context, pools, zone): if len(pools) > 1: default_pool_id = cfg.CONF['service:central'].default_pool_id try: default_pool =, default_pool_id) except Exception: return pools if default_pool in pools: pools = objects.PoolList() pools.append(default_pool) return pools