/
aggregate_multitenancy_isolation.py
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/
aggregate_multitenancy_isolation.py
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# Copyright (c) 2011-2013 OpenStack Foundation
# 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.
from oslo_log import log as logging
from nova.scheduler import filters
from nova.scheduler.filters import utils
LOG = logging.getLogger(__name__)
class AggregateMultiTenancyIsolation(filters.BaseHostFilter):
"""Isolate tenants in specific aggregates."""
# Aggregate data and tenant do not change within a request
run_filter_once_per_request = True
RUN_ON_REBUILD = False
def host_passes(self, host_state, spec_obj):
"""If a host is in an aggregate that has the metadata key
"filter_tenant_id" it can only create instances from that tenant(s).
A host can be in different aggregates.
If a host doesn't belong to an aggregate with the metadata key
"filter_tenant_id" it can create instances from all tenants.
"""
tenant_id = spec_obj.project_id
metadata = utils.aggregate_metadata_get_by_host(host_state,
key="filter_tenant_id")
if metadata != {}:
configured_tenant_ids = metadata.get("filter_tenant_id")
if configured_tenant_ids:
if tenant_id not in configured_tenant_ids:
LOG.debug("%s fails tenant id on aggregate", host_state)
return False
LOG.debug("Host tenant id %s matched", tenant_id)
else:
LOG.debug("No tenant id's defined on host. Host passes.")
return True