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