159 lines
6.4 KiB
Python
159 lines
6.4 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_config import cfg
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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_utils import importutils
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from nova import exception
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from nova import manager
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from nova import objects
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from nova.openstack.common import periodic_task
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from nova import quota
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LOG = logging.getLogger(__name__)
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scheduler_driver_opts = [
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cfg.StrOpt('scheduler_driver',
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default='nova.scheduler.filter_scheduler.FilterScheduler',
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help='Default driver to use for the scheduler'),
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cfg.IntOpt('scheduler_driver_task_period',
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default=60,
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help='How often (in seconds) to run periodic tasks in '
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'the scheduler driver of your choice. '
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'Please note this is likely to interact with the value '
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'of service_down_time, but exactly how they interact '
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'will depend on your choice of scheduler driver.'),
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]
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CONF = cfg.CONF
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CONF.register_opts(scheduler_driver_opts)
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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='4.2')
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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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self.driver = importutils.import_object(scheduler_driver)
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super(SchedulerManager, self).__init__(service_name='scheduler',
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*args, **kwargs)
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self.additional_endpoints.append(_SchedulerManagerV3Proxy(self))
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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, context, request_spec, filter_properties):
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"""Returns destinations(s) best suited for this request_spec and
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filter_properties.
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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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dests = self.driver.select_destinations(context, request_spec,
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filter_properties)
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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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class _SchedulerManagerV3Proxy(object):
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target = messaging.Target(version='3.0')
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def __init__(self, manager):
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self.manager = manager
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# NOTE(sbauza): Previous run_instance() and prep_resize() methods were
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# removed from the Juno branch before Juno released, so we can safely
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# remove them even from the V3.1 proxy as there is no Juno RPC client
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# that can call them
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@messaging.expected_exceptions(exception.NoValidHost)
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def select_destinations(self, context, request_spec, filter_properties):
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"""Returns destinations(s) best suited for this request_spec and
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filter_properties.
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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(melwitt): Remove this in version 4.0 of the RPC API
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flavor = filter_properties.get('instance_type')
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if flavor and not isinstance(flavor, objects.Flavor):
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# Code downstream may expect extra_specs to be populated since it
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# is receiving an object, so lookup the flavor to ensure this.
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flavor = objects.Flavor.get_by_id(context, flavor['id'])
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filter_properties = dict(filter_properties, instance_type=flavor)
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dests = self.manager.select_destinations(context, request_spec,
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filter_properties)
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return dests
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