82 lines
2.9 KiB
Python
82 lines
2.9 KiB
Python
# Copyright 2016 Hewlett Packard Enterprise Development Company, L.P.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from oslo_config import cfg
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from oslo_log import log as logging
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from stevedore import named
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from designate import exceptions
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LOG = logging.getLogger(__name__)
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class Scheduler(object):
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"""Scheduler that schedules zones based on the filters provided on the zone
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and other inputs.
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:raises: NoFiltersConfigured
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"""
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filters = []
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"""The list of filters enabled on this scheduler"""
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def __init__(self, storage):
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enabled_filters = cfg.CONF['service:central'].scheduler_filters
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# Get a storage connection
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self.storage = storage
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if len(enabled_filters) > 0:
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filters = named.NamedExtensionManager(
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namespace='designate.scheduler.filters',
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names=enabled_filters,
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name_order=True)
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self.filters = [x.plugin(storage=self.storage) for x in filters]
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for filter in self.filters:
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LOG.info("Loaded Scheduler Filter: %s", filter.name)
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else:
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raise exceptions.NoFiltersConfigured('There are no scheduling '
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'filters configured')
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def schedule_zone(self, context, zone):
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"""Get a pool to create the new zone in.
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:param context: :class:`designate.context.DesignateContext` - Context
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Object from request
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:param zone: :class:`designate.objects.zone.Zone` - Zone to be created
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:return: string -- ID of pool to schedule the zone to.
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:raises: MultiplePoolsFound, NoValidPoolFound
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"""
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pools = self.storage.find_pools(context)
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if len(self.filters) is 0:
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raise exceptions.NoFiltersConfigured('There are no scheduling '
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'filters configured')
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for f in self.filters:
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LOG.debug("Running %s filter with %d pools", f.name, len(pools))
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pools = f.filter(context, pools, zone)
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LOG.debug(
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"%d candidate pools remaining after %s filter",
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len(pools),
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f.name)
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if len(pools) > 1:
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raise exceptions.MultiplePoolsFound()
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if len(pools) is 0:
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raise exceptions.NoValidPoolFound('There are no pools that '
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'matched your request')
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return pools[0].id
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