15ccf2ddfb
The InstanceList.get_by_filters query is joining on info_cache, security_groups, metadata and system_metadata because of how instance_get_all_by_filters_sort in the DB API works if columns_to_join (expected_attrs) is None. The get_hosts method only cares about the instance.host value of its members so those joins are unnecessarily expensive. This change simply passes expected_attrs=[] to get_by_filters to avoid the joins. A follow up change can further optimize this code by adding a new query method to just get the host values for a list of instance uuids, so a TODO is left in place for that. Note that a new query method would need to be remotable and thus not something we can backport. Change-Id: I53d4b38d12404a1641f667c537404effa837a83d Partial-Bug: #1830234
586 lines
24 KiB
Python
586 lines
24 KiB
Python
# Copyright (c) 2013 OpenStack Foundation
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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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import copy
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from oslo_db import exception as db_exc
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from oslo_log import log as logging
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from oslo_serialization import jsonutils
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from oslo_utils import uuidutils
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from oslo_utils import versionutils
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from sqlalchemy.orm import contains_eager
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from sqlalchemy.orm import joinedload
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from nova.compute import utils as compute_utils
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from nova.db.sqlalchemy import api as db_api
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from nova.db.sqlalchemy import api_models
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from nova import exception
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from nova import objects
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from nova.objects import base
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from nova.objects import fields
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LAZY_LOAD_FIELDS = ['hosts']
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LOG = logging.getLogger(__name__)
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def _instance_group_get_query(context, id_field=None, id=None):
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query = context.session.query(api_models.InstanceGroup).\
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options(joinedload('_policies')).\
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options(joinedload('_members'))
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if not context.is_admin:
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query = query.filter_by(project_id=context.project_id)
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if id and id_field:
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query = query.filter(id_field == id)
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return query
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def _instance_group_model_get_query(context, model_class, group_id):
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return context.session.query(model_class).filter_by(group_id=group_id)
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def _instance_group_model_add(context, model_class, items, item_models, field,
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group_id, append_to_models=None):
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models = []
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already_existing = set()
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for db_item in item_models:
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already_existing.add(getattr(db_item, field))
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models.append(db_item)
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for item in items:
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if item in already_existing:
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continue
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model = model_class()
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values = {'group_id': group_id}
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values[field] = item
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model.update(values)
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context.session.add(model)
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if append_to_models:
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append_to_models.append(model)
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models.append(model)
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return models
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def _instance_group_members_add(context, group, members):
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query = _instance_group_model_get_query(context,
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api_models.InstanceGroupMember,
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group.id)
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query = query.filter(
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api_models.InstanceGroupMember.instance_uuid.in_(set(members)))
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return _instance_group_model_add(context, api_models.InstanceGroupMember,
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members, query.all(), 'instance_uuid',
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group.id, append_to_models=group._members)
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def _instance_group_members_add_by_uuid(context, group_uuid, members):
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# NOTE(melwitt): The condition on the join limits the number of members
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# returned to only those we wish to check as already existing.
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group = context.session.query(api_models.InstanceGroup).\
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outerjoin(api_models.InstanceGroupMember,
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api_models.InstanceGroupMember.instance_uuid.in_(set(members))).\
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filter(api_models.InstanceGroup.uuid == group_uuid).\
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options(contains_eager('_members')).first()
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if not group:
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raise exception.InstanceGroupNotFound(group_uuid=group_uuid)
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return _instance_group_model_add(context, api_models.InstanceGroupMember,
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members, group._members, 'instance_uuid',
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group.id)
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# TODO(berrange): Remove NovaObjectDictCompat
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# TODO(mriedem): Replace NovaPersistentObject with TimestampedObject in v2.0.
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@base.NovaObjectRegistry.register
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class InstanceGroup(base.NovaPersistentObject, base.NovaObject,
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base.NovaObjectDictCompat):
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# Version 1.0: Initial version
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# Version 1.1: String attributes updated to support unicode
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# Version 1.2: Use list/dict helpers for policies, metadetails, members
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# Version 1.3: Make uuid a non-None real string
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# Version 1.4: Add add_members()
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# Version 1.5: Add get_hosts()
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# Version 1.6: Add get_by_name()
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# Version 1.7: Deprecate metadetails
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# Version 1.8: Add count_members_by_user()
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# Version 1.9: Add get_by_instance_uuid()
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# Version 1.10: Add hosts field
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# Version 1.11: Add policy and deprecate policies, add _rules
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VERSION = '1.11'
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fields = {
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'id': fields.IntegerField(),
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'user_id': fields.StringField(nullable=True),
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'project_id': fields.StringField(nullable=True),
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'uuid': fields.UUIDField(),
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'name': fields.StringField(nullable=True),
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'policies': fields.ListOfStringsField(nullable=True, read_only=True),
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'members': fields.ListOfStringsField(nullable=True),
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'hosts': fields.ListOfStringsField(nullable=True),
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'policy': fields.StringField(nullable=True),
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# NOTE(danms): Use rules not _rules for general access
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'_rules': fields.DictOfStringsField(),
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}
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def __init__(self, *args, **kwargs):
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if 'rules' in kwargs:
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kwargs['_rules'] = kwargs.pop('rules')
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super(InstanceGroup, self).__init__(*args, **kwargs)
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@property
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def rules(self):
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if '_rules' not in self:
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return {}
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# NOTE(danms): Coerce our rules into a typed dict for convenience
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rules = {}
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if 'max_server_per_host' in self._rules:
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rules['max_server_per_host'] = \
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int(self._rules['max_server_per_host'])
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return rules
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def obj_make_compatible(self, primitive, target_version):
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target_version = versionutils.convert_version_to_tuple(target_version)
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if target_version < (1, 11):
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# NOTE(yikun): Before 1.11, we had a policies property which is
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# the list of policy name, even though it was a list, there was
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# ever only one entry in the list.
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policy = primitive.pop('policy', None)
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if policy:
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primitive['policies'] = [policy]
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else:
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primitive['policies'] = []
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primitive.pop('rules', None)
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if target_version < (1, 7):
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# NOTE(danms): Before 1.7, we had an always-empty
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# metadetails property
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primitive['metadetails'] = {}
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@staticmethod
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def _from_db_object(context, instance_group, db_inst):
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"""Method to help with migration to objects.
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Converts a database entity to a formal object.
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"""
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# Most of the field names match right now, so be quick
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for field in instance_group.fields:
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if field in LAZY_LOAD_FIELDS:
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continue
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# This is needed to handle db models from both the api
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# database and the main database. In the migration to
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# the api database, we have removed soft-delete, so
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# the object fields for delete must be filled in with
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# default values for db models from the api database.
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# TODO(mriedem): Remove this when NovaPersistentObject is removed.
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ignore = {'deleted': False,
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'deleted_at': None}
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if '_rules' == field:
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db_policy = db_inst['policy']
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instance_group._rules = (
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jsonutils.loads(db_policy['rules'])
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if db_policy and db_policy['rules']
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else {})
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elif field in ignore and not hasattr(db_inst, field):
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instance_group[field] = ignore[field]
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elif 'policies' == field:
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continue
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# NOTE(yikun): The obj.policies is deprecated and marked as
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# read_only in version 1.11, and there is no "policies" property
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# in InstanceGroup model anymore, so we just skip to set
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# "policies" and then load the "policies" when "policy" is set.
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elif 'policy' == field:
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db_policy = db_inst['policy']
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if db_policy:
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instance_group.policy = db_policy['policy']
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instance_group.policies = [instance_group.policy]
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else:
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instance_group.policy = None
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instance_group.policies = []
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else:
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instance_group[field] = db_inst[field]
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instance_group._context = context
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instance_group.obj_reset_changes()
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return instance_group
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@staticmethod
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@db_api.api_context_manager.reader
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def _get_from_db_by_uuid(context, uuid):
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grp = _instance_group_get_query(context,
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id_field=api_models.InstanceGroup.uuid,
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id=uuid).first()
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if not grp:
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raise exception.InstanceGroupNotFound(group_uuid=uuid)
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return grp
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@staticmethod
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@db_api.api_context_manager.reader
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def _get_from_db_by_id(context, id):
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grp = _instance_group_get_query(context,
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id_field=api_models.InstanceGroup.id,
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id=id).first()
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if not grp:
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raise exception.InstanceGroupNotFound(group_uuid=id)
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return grp
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@staticmethod
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@db_api.api_context_manager.reader
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def _get_from_db_by_name(context, name):
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grp = _instance_group_get_query(context).filter_by(name=name).first()
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if not grp:
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raise exception.InstanceGroupNotFound(group_uuid=name)
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return grp
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@staticmethod
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@db_api.api_context_manager.reader
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def _get_from_db_by_instance(context, instance_uuid):
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grp_member = context.session.query(api_models.InstanceGroupMember).\
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filter_by(instance_uuid=instance_uuid).first()
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if not grp_member:
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raise exception.InstanceGroupNotFound(group_uuid='')
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grp = InstanceGroup._get_from_db_by_id(context, grp_member.group_id)
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return grp
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@staticmethod
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@db_api.api_context_manager.writer
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def _save_in_db(context, group_uuid, values):
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grp = InstanceGroup._get_from_db_by_uuid(context, group_uuid)
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values_copy = copy.copy(values)
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members = values_copy.pop('members', None)
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grp.update(values_copy)
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if members is not None:
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_instance_group_members_add(context, grp, members)
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return grp
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@staticmethod
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@db_api.api_context_manager.writer
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def _create_in_db(context, values, policies=None, members=None,
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policy=None, rules=None):
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try:
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group = api_models.InstanceGroup()
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group.update(values)
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group.save(context.session)
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except db_exc.DBDuplicateEntry:
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raise exception.InstanceGroupIdExists(group_uuid=values['uuid'])
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if policies:
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db_policy = api_models.InstanceGroupPolicy(
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group_id=group['id'], policy=policies[0], rules=None)
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group._policies = [db_policy]
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group.rules = None
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elif policy:
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db_rules = jsonutils.dumps(rules or {})
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db_policy = api_models.InstanceGroupPolicy(
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group_id=group['id'], policy=policy,
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rules=db_rules)
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group._policies = [db_policy]
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else:
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group._policies = []
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if group._policies:
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group.save(context.session)
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if members:
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group._members = _instance_group_members_add(context, group,
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members)
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else:
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group._members = []
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return group
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@staticmethod
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@db_api.api_context_manager.writer
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def _destroy_in_db(context, group_uuid):
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qry = _instance_group_get_query(context,
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id_field=api_models.InstanceGroup.uuid,
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id=group_uuid)
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if qry.count() == 0:
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raise exception.InstanceGroupNotFound(group_uuid=group_uuid)
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# Delete policies and members
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group_id = qry.first().id
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instance_models = [api_models.InstanceGroupPolicy,
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api_models.InstanceGroupMember]
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for model in instance_models:
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context.session.query(model).filter_by(group_id=group_id).delete()
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qry.delete()
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@staticmethod
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@db_api.api_context_manager.writer
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def _add_members_in_db(context, group_uuid, members):
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return _instance_group_members_add_by_uuid(context, group_uuid,
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members)
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@staticmethod
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@db_api.api_context_manager.writer
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def _remove_members_in_db(context, group_id, instance_uuids):
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# There is no public method provided for removing members because the
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# user-facing API doesn't allow removal of instance group members. We
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# need to be able to remove members to address quota races.
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context.session.query(api_models.InstanceGroupMember).\
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filter_by(group_id=group_id).\
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filter(api_models.InstanceGroupMember.instance_uuid.
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in_(set(instance_uuids))).\
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delete(synchronize_session=False)
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@staticmethod
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@db_api.api_context_manager.writer
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def _destroy_members_bulk_in_db(context, instance_uuids):
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return context.session.query(api_models.InstanceGroupMember).filter(
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api_models.InstanceGroupMember.instance_uuid.in_(instance_uuids)).\
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delete(synchronize_session=False)
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@classmethod
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def destroy_members_bulk(cls, context, instance_uuids):
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return cls._destroy_members_bulk_in_db(context, instance_uuids)
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def obj_load_attr(self, attrname):
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# NOTE(sbauza): Only hosts could be lazy-loaded right now
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if attrname != 'hosts':
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raise exception.ObjectActionError(
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action='obj_load_attr', reason='unable to load %s' % attrname)
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LOG.debug("Lazy-loading '%(attr)s' on %(name)s uuid %(uuid)s",
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{'attr': attrname,
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'name': self.obj_name(),
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'uuid': self.uuid,
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})
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self.hosts = self.get_hosts()
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self.obj_reset_changes(['hosts'])
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@base.remotable_classmethod
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def get_by_uuid(cls, context, uuid):
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db_group = cls._get_from_db_by_uuid(context, uuid)
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return cls._from_db_object(context, cls(), db_group)
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@base.remotable_classmethod
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def get_by_name(cls, context, name):
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db_group = cls._get_from_db_by_name(context, name)
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return cls._from_db_object(context, cls(), db_group)
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@base.remotable_classmethod
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def get_by_instance_uuid(cls, context, instance_uuid):
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db_group = cls._get_from_db_by_instance(context, instance_uuid)
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return cls._from_db_object(context, cls(), db_group)
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@classmethod
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def get_by_hint(cls, context, hint):
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if uuidutils.is_uuid_like(hint):
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return cls.get_by_uuid(context, hint)
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else:
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return cls.get_by_name(context, hint)
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@base.remotable
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def save(self):
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"""Save updates to this instance group."""
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updates = self.obj_get_changes()
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# NOTE(sbauza): We do NOT save the set of compute nodes that an
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# instance group is connected to in this method. Instance groups are
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# implicitly connected to compute nodes when the
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# InstanceGroup.add_members() method is called, which adds the mapping
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# table entries.
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# So, since the only way to have hosts in the updates is to set that
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# field explicitly, we prefer to raise an Exception so the developer
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# knows he has to call obj_reset_changes(['hosts']) right after setting
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# the field.
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if 'hosts' in updates:
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raise exception.InstanceGroupSaveException(field='hosts')
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# NOTE(yikun): You have to provide exactly one policy on group create,
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# and also there are no group update APIs, so we do NOT support
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# policies update.
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if 'policies' in updates:
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raise exception.InstanceGroupSaveException(field='policies')
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if not updates:
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return
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payload = dict(updates)
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payload['server_group_id'] = self.uuid
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db_group = self._save_in_db(self._context, self.uuid, updates)
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self._from_db_object(self._context, self, db_group)
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compute_utils.notify_about_server_group_update(self._context,
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"update", payload)
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@base.remotable
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def refresh(self):
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"""Refreshes the instance group."""
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current = self.__class__.get_by_uuid(self._context, self.uuid)
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for field in self.fields:
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if self.obj_attr_is_set(field) and self[field] != current[field]:
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self[field] = current[field]
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self.obj_reset_changes()
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@base.remotable
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def create(self):
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if self.obj_attr_is_set('id'):
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raise exception.ObjectActionError(action='create',
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reason='already created')
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updates = self.obj_get_changes()
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payload = dict(updates)
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updates.pop('id', None)
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policies = updates.pop('policies', None)
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policy = updates.pop('policy', None)
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rules = updates.pop('_rules', None)
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members = updates.pop('members', None)
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if 'uuid' not in updates:
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self.uuid = uuidutils.generate_uuid()
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updates['uuid'] = self.uuid
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db_group = self._create_in_db(self._context, updates,
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policies=policies,
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members=members,
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policy=policy,
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rules=rules)
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self._from_db_object(self._context, self, db_group)
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payload['server_group_id'] = self.uuid
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compute_utils.notify_about_server_group_update(self._context,
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"create", payload)
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compute_utils.notify_about_server_group_action(
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context=self._context,
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group=self,
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action=fields.NotificationAction.CREATE)
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@base.remotable
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def destroy(self):
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payload = {'server_group_id': self.uuid}
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self._destroy_in_db(self._context, self.uuid)
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self.obj_reset_changes()
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compute_utils.notify_about_server_group_update(self._context,
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"delete", payload)
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compute_utils.notify_about_server_group_action(
|
|
context=self._context,
|
|
group=self,
|
|
action=fields.NotificationAction.DELETE)
|
|
|
|
@base.remotable_classmethod
|
|
def add_members(cls, context, group_uuid, instance_uuids):
|
|
payload = {'server_group_id': group_uuid,
|
|
'instance_uuids': instance_uuids}
|
|
members = cls._add_members_in_db(context, group_uuid,
|
|
instance_uuids)
|
|
members = [member['instance_uuid'] for member in members]
|
|
compute_utils.notify_about_server_group_update(context,
|
|
"addmember", payload)
|
|
compute_utils.notify_about_server_group_add_member(context, group_uuid)
|
|
return list(members)
|
|
|
|
@base.remotable
|
|
def get_hosts(self, exclude=None):
|
|
"""Get a list of hosts for non-deleted instances in the group
|
|
|
|
This method allows you to get a list of the hosts where instances in
|
|
this group are currently running. There's also an option to exclude
|
|
certain instance UUIDs from this calculation.
|
|
|
|
"""
|
|
filter_uuids = self.members
|
|
if exclude:
|
|
filter_uuids = set(filter_uuids) - set(exclude)
|
|
filters = {'uuid': filter_uuids, 'deleted': False}
|
|
# Pass expected_attrs=[] to avoid unnecessary joins.
|
|
# TODO(mriedem): This is pretty inefficient since all we care about
|
|
# are the hosts. We could optimize this with a single-purpose SQL query
|
|
# like:
|
|
# SELECT host FROM instances WHERE deleted=0 AND host IS NOT NULL
|
|
# AND uuid IN ($filter_uuids) GROUP BY host;
|
|
instances = objects.InstanceList.get_by_filters(self._context,
|
|
filters=filters,
|
|
expected_attrs=[])
|
|
return list(set([instance.host for instance in instances
|
|
if instance.host]))
|
|
|
|
@base.remotable
|
|
def count_members_by_user(self, user_id):
|
|
"""Count the number of instances in a group belonging to a user."""
|
|
filter_uuids = self.members
|
|
filters = {'uuid': filter_uuids, 'user_id': user_id, 'deleted': False}
|
|
instances = objects.InstanceList.get_by_filters(self._context,
|
|
filters=filters)
|
|
return len(instances)
|
|
|
|
|
|
@base.NovaObjectRegistry.register
|
|
class InstanceGroupList(base.ObjectListBase, base.NovaObject):
|
|
# Version 1.0: Initial version
|
|
# InstanceGroup <= version 1.3
|
|
# Version 1.1: InstanceGroup <= version 1.4
|
|
# Version 1.2: InstanceGroup <= version 1.5
|
|
# Version 1.3: InstanceGroup <= version 1.6
|
|
# Version 1.4: InstanceGroup <= version 1.7
|
|
# Version 1.5: InstanceGroup <= version 1.8
|
|
# Version 1.6: InstanceGroup <= version 1.9
|
|
# Version 1.7: InstanceGroup <= version 1.10
|
|
# Version 1.8: Added get_counts() for quotas
|
|
VERSION = '1.8'
|
|
|
|
fields = {
|
|
'objects': fields.ListOfObjectsField('InstanceGroup'),
|
|
}
|
|
|
|
@staticmethod
|
|
@db_api.api_context_manager.reader
|
|
def _get_from_db(context, project_id=None):
|
|
query = _instance_group_get_query(context)
|
|
if project_id is not None:
|
|
query = query.filter_by(project_id=project_id)
|
|
return query.all()
|
|
|
|
@staticmethod
|
|
@db_api.api_context_manager.reader
|
|
def _get_counts_from_db(context, project_id, user_id=None):
|
|
query = context.session.query(api_models.InstanceGroup.id).\
|
|
filter_by(project_id=project_id)
|
|
counts = {}
|
|
counts['project'] = {'server_groups': query.count()}
|
|
if user_id:
|
|
query = query.filter_by(user_id=user_id)
|
|
counts['user'] = {'server_groups': query.count()}
|
|
return counts
|
|
|
|
@base.remotable_classmethod
|
|
def get_by_project_id(cls, context, project_id):
|
|
api_db_groups = cls._get_from_db(context, project_id=project_id)
|
|
return base.obj_make_list(context, cls(context), objects.InstanceGroup,
|
|
api_db_groups)
|
|
|
|
@base.remotable_classmethod
|
|
def get_all(cls, context):
|
|
api_db_groups = cls._get_from_db(context)
|
|
return base.obj_make_list(context, cls(context), objects.InstanceGroup,
|
|
api_db_groups)
|
|
|
|
@base.remotable_classmethod
|
|
def get_counts(cls, context, project_id, user_id=None):
|
|
"""Get the counts of InstanceGroup objects in the database.
|
|
|
|
:param context: The request context for database access
|
|
:param project_id: The project_id to count across
|
|
:param user_id: The user_id to count across
|
|
:returns: A dict containing the project-scoped counts and user-scoped
|
|
counts if user_id is specified. For example:
|
|
|
|
{'project': {'server_groups': <count across project>},
|
|
'user': {'server_groups': <count across user>}}
|
|
"""
|
|
return cls._get_counts_from_db(context, project_id, user_id=user_id)
|