33d906a2e0
Avoid having to configure the full class path of scheduler driver, change to load by stevedore driver plugin using entrypoints. Change 'scheduler_driver' to use entrypoint with the namespace 'nova.scheduler.driver' in 'setup.cfg'. Meanwhile, still maintain the compatibility for class path configuration until the next major release. Change all related tests with flag 'scheduler_driver' to use stevedore entrypoint. UpgradeImpact - see the reno file attached. Implements: blueprint scheduler-driver-use-stevedore Change-Id: I8c169e12d9bfacdbdb1dadf68b8a1fa98c5ea5bc
146 lines
5.8 KiB
Python
146 lines
5.8 KiB
Python
# Copyright (c) 2010 OpenStack Foundation
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# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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# All Rights Reserved.
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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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"""
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Scheduler Service
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"""
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from oslo_log import log as logging
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import oslo_messaging as messaging
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from oslo_serialization import jsonutils
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from oslo_service import periodic_task
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from oslo_utils import importutils
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from stevedore import driver
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import nova.conf
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from nova import exception
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from nova.i18n import _, _LW
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from nova import manager
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from nova import objects
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from nova import quota
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LOG = logging.getLogger(__name__)
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CONF = nova.conf.CONF
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QUOTAS = quota.QUOTAS
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class SchedulerManager(manager.Manager):
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"""Chooses a host to run instances on."""
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target = messaging.Target(version='4.3')
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_sentinel = object()
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def __init__(self, scheduler_driver=None, *args, **kwargs):
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if not scheduler_driver:
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scheduler_driver = CONF.scheduler_driver
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try:
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self.driver = driver.DriverManager(
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"nova.scheduler.driver",
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scheduler_driver,
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invoke_on_load=True).driver
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# TODO(Yingxin): Change to catch stevedore.exceptions.NoMatches after
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# stevedore v1.9.0
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except RuntimeError:
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# NOTE(Yingxin): Loading full class path is deprecated and should
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# be removed in the N release.
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try:
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self.driver = importutils.import_object(scheduler_driver)
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LOG.warning(_LW("DEPRECATED: scheduler_driver uses "
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"classloader to load %(path)s. This legacy "
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"loading style will be removed in the "
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"N release."),
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{'path': scheduler_driver})
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except (ImportError, ValueError):
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raise RuntimeError(
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_("Cannot load scheduler driver from configuration "
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"%(conf)s."),
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{'conf': scheduler_driver})
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super(SchedulerManager, self).__init__(service_name='scheduler',
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*args, **kwargs)
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@periodic_task.periodic_task
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def _expire_reservations(self, context):
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QUOTAS.expire(context)
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@periodic_task.periodic_task(spacing=CONF.scheduler_driver_task_period,
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run_immediately=True)
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def _run_periodic_tasks(self, context):
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self.driver.run_periodic_tasks(context)
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@messaging.expected_exceptions(exception.NoValidHost)
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def select_destinations(self, ctxt,
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request_spec=None, filter_properties=None,
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spec_obj=_sentinel):
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"""Returns destinations(s) best suited for this RequestSpec.
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The result should be a list of dicts with 'host', 'nodename' and
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'limits' as keys.
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"""
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# TODO(sbauza): Change the method signature to only accept a spec_obj
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# argument once API v5 is provided.
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if spec_obj is self._sentinel:
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spec_obj = objects.RequestSpec.from_primitives(ctxt,
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request_spec,
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filter_properties)
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dests = self.driver.select_destinations(ctxt, spec_obj)
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return jsonutils.to_primitive(dests)
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def update_aggregates(self, ctxt, aggregates):
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"""Updates HostManager internal aggregates information.
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:param aggregates: Aggregate(s) to update
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:type aggregates: :class:`nova.objects.Aggregate`
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or :class:`nova.objects.AggregateList`
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"""
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# NOTE(sbauza): We're dropping the user context now as we don't need it
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self.driver.host_manager.update_aggregates(aggregates)
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def delete_aggregate(self, ctxt, aggregate):
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"""Deletes HostManager internal information about a specific aggregate.
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:param aggregate: Aggregate to delete
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:type aggregate: :class:`nova.objects.Aggregate`
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"""
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# NOTE(sbauza): We're dropping the user context now as we don't need it
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self.driver.host_manager.delete_aggregate(aggregate)
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def update_instance_info(self, context, host_name, instance_info):
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"""Receives information about changes to a host's instances, and
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updates the driver's HostManager with that information.
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"""
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self.driver.host_manager.update_instance_info(context, host_name,
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instance_info)
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def delete_instance_info(self, context, host_name, instance_uuid):
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"""Receives information about the deletion of one of a host's
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instances, and updates the driver's HostManager with that information.
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"""
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self.driver.host_manager.delete_instance_info(context, host_name,
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instance_uuid)
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def sync_instance_info(self, context, host_name, instance_uuids):
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"""Receives a sync request from a host, and passes it on to the
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driver's HostManager.
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"""
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self.driver.host_manager.sync_instance_info(context, host_name,
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instance_uuids)
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