Erik Olof Gunnar Andersson
4438350451
This patch is not changing any functionality, but instead it is aimed at cleaning up the scheduler code. It also removes the use of reserved keywords in the scheduler code. Change-Id: I93cede3371f1ec650adf3b00bf8250457a38f96c
86 lines
2.9 KiB
Python
86 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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self.filters = list()
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self.storage = storage
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if not enabled_filters:
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raise exceptions.NoFiltersConfigured(
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'There are no scheduling filters configured'
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)
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extensions = 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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)
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for extension in extensions:
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plugin = extension.plugin(storage=self.storage)
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LOG.info('Loaded Scheduler Filter: %s', plugin.name)
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self.filters.append(plugin)
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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 not self.filters:
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raise exceptions.NoFiltersConfigured('There are no scheduling '
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'filters configured')
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for plugin in self.filters:
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LOG.debug(
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'Running %s filter with %d pools', plugin.name, len(pools)
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)
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pools = plugin.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), plugin.name
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)
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if len(pools) > 1:
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raise exceptions.MultiplePoolsFound()
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if not pools:
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raise exceptions.NoValidPoolFound(
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'There are no pools that matched your request'
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)
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return pools[0].id
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