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# Copyright (c) 2010 OpenStack Foundation
# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# All Rights Reserved.
#
# 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
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""
Scheduler Service
"""
from oslo_config import cfg
from oslo_log import log as logging
import oslo_messaging as messaging
from oslo_serialization import jsonutils
from oslo_service import periodic_task
from oslo_utils import importutils
from nova import exception
from nova import manager
from nova import quota
LOG = logging.getLogger(__name__)
scheduler_driver_opts = [
cfg.StrOpt('scheduler_driver',
default='nova.scheduler.filter_scheduler.FilterScheduler',
help='Default driver to use for the scheduler'),
cfg.IntOpt('scheduler_driver_task_period',
default=60,
help='How often (in seconds) to run periodic tasks in '
'the scheduler driver of your choice. '
'Please note this is likely to interact with the value '
'of service_down_time, but exactly how they interact '
'will depend on your choice of scheduler driver.'),
]
CONF = cfg.CONF
CONF.register_opts(scheduler_driver_opts)
QUOTAS = quota.QUOTAS
class SchedulerManager(manager.Manager):
"""Chooses a host to run instances on."""
target = messaging.Target(version='4.2')
def __init__(self, scheduler_driver=None, *args, **kwargs):
if not scheduler_driver:
scheduler_driver = CONF.scheduler_driver
self.driver = importutils.import_object(scheduler_driver)
super(SchedulerManager, self).__init__(service_name='scheduler',
*args, **kwargs)
@periodic_task.periodic_task
def _expire_reservations(self, context):
QUOTAS.expire(context)
@periodic_task.periodic_task(spacing=CONF.scheduler_driver_task_period,
run_immediately=True)
def _run_periodic_tasks(self, context):
self.driver.run_periodic_tasks(context)
@messaging.expected_exceptions(exception.NoValidHost)
def select_destinations(self, context, request_spec, filter_properties):
"""Returns destinations(s) best suited for this request_spec and
filter_properties.
The result should be a list of dicts with 'host', 'nodename' and
'limits' as keys.
"""
dests = self.driver.select_destinations(context, request_spec,
filter_properties)
return jsonutils.to_primitive(dests)
def update_aggregates(self, ctxt, aggregates):
"""Updates HostManager internal aggregates information.
:param aggregates: Aggregate(s) to update
:type aggregates: :class:`nova.objects.Aggregate`
or :class:`nova.objects.AggregateList`
"""
# NOTE(sbauza): We're dropping the user context now as we don't need it
self.driver.host_manager.update_aggregates(aggregates)
def delete_aggregate(self, ctxt, aggregate):
"""Deletes HostManager internal information about a specific aggregate.
:param aggregate: Aggregate to delete
:type aggregate: :class:`nova.objects.Aggregate`
"""
# NOTE(sbauza): We're dropping the user context now as we don't need it
self.driver.host_manager.delete_aggregate(aggregate)
def update_instance_info(self, context, host_name, instance_info):
"""Receives information about changes to a host's instances, and
updates the driver's HostManager with that information.
"""
self.driver.host_manager.update_instance_info(context, host_name,
instance_info)
def delete_instance_info(self, context, host_name, instance_uuid):
"""Receives information about the deletion of one of a host's
instances, and updates the driver's HostManager with that information.
"""
self.driver.host_manager.delete_instance_info(context, host_name,
instance_uuid)
def sync_instance_info(self, context, host_name, instance_uuids):
"""Receives a sync request from a host, and passes it on to the
driver's HostManager.
"""
self.driver.host_manager.sync_instance_info(context, host_name,
instance_uuids)
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