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# Copyright (c) 2014 Red Hat, Inc.
# 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
# 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.
from nova.scheduler import rpcapi as scheduler_rpcapi
class SchedulerQueryClient(object):
"""Client class for querying to the scheduler."""
def __init__(self):
self.scheduler_rpcapi = scheduler_rpcapi.SchedulerAPI()
def select_destinations(self, context, spec_obj, instance_uuids,
return_objects=False, return_alternates=False):
"""Returns destinations(s) best suited for this request_spec and
When return_objects is False, the result will be the "old-style" list
of dicts with 'host', 'nodename' and 'limits' as keys. The value of
return_alternates is ignored.
When return_objects is True, the result will be a list of lists of
Selection objects, with one list per instance. Each instance's list
will contain a Selection representing the selected (and claimed) host,
and, if return_alternates is True, zero or more Selection objects that
represent alternate hosts. The number of alternates returned depends on
the configuration setting `CONF.scheduler.max_attempts`.
return self.scheduler_rpcapi.select_destinations(context, spec_obj,
instance_uuids, return_objects, return_alternates)
def update_aggregates(self, context, aggregates):
"""Updates HostManager internal aggregates information.
:param aggregates: Aggregate(s) to update
:type aggregates: :class:`nova.objects.Aggregate`
or :class:`nova.objects.AggregateList`
self.scheduler_rpcapi.update_aggregates(context, aggregates)
def delete_aggregate(self, context, aggregate):
"""Deletes HostManager internal information about a specific aggregate.
:param aggregate: Aggregate to delete
:type aggregate: :class:`nova.objects.Aggregate`
self.scheduler_rpcapi.delete_aggregate(context, aggregate)
def update_instance_info(self, context, host_name, instance_info):
"""Updates the HostManager with the current information about the
instances on a host.
:param context: local context
:param host_name: name of host sending the update
:param instance_info: an InstanceList object.
self.scheduler_rpcapi.update_instance_info(context, host_name,
def delete_instance_info(self, context, host_name, instance_uuid):
"""Updates the HostManager with the current information about an
instance that has been deleted on a host.
:param context: local context
:param host_name: name of host sending the update
:param instance_uuid: the uuid of the deleted instance
self.scheduler_rpcapi.delete_instance_info(context, host_name,
def sync_instance_info(self, context, host_name, instance_uuids):
"""Notifies the HostManager of the current instances on a host by
sending a list of the uuids for those instances. The HostManager can
then compare that with its in-memory view of the instances to detect
when they are out of sync.
:param context: local context
:param host_name: name of host sending the update
:param instance_uuids: a list of UUID strings representing the current
instances on the specified host
self.scheduler_rpcapi.sync_instance_info(context, host_name,