101 lines
3.6 KiB
Python
101 lines
3.6 KiB
Python
# 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 oslo_log import log as logging
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import nova.conf
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from nova import exception
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from nova.i18n import _
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from nova import objects
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CONF = nova.conf.CONF
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LOG = logging.getLogger(__name__)
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TENANT_METADATA_KEY = 'filter_tenant_id'
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def require_tenant_aggregate(ctxt, request_spec):
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"""Require hosts in an aggregate based on tenant id.
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This will modify request_spec to request hosts in an aggregate
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defined specifically for the tenant making the request. We do that
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by looking for a nova host aggregate with metadata indicating which
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tenant it is for, and passing that aggregate uuid to placement to
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limit results accordingly.
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"""
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enabled = CONF.scheduler.limit_tenants_to_placement_aggregate
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agg_required = CONF.scheduler.placement_aggregate_required_for_tenants
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if not enabled:
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return
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aggregates = objects.AggregateList.get_by_metadata(
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ctxt, value=request_spec.project_id)
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aggregate_uuids_for_tenant = set([])
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for agg in aggregates:
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for key, value in agg.metadata.items():
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if key.startswith(TENANT_METADATA_KEY):
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aggregate_uuids_for_tenant.add(agg.uuid)
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break
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if aggregate_uuids_for_tenant:
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if ('requested_destination' not in request_spec or
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request_spec.requested_destination is None):
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request_spec.requested_destination = objects.Destination()
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destination = request_spec.requested_destination
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destination.require_aggregates(aggregate_uuids_for_tenant)
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elif agg_required:
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LOG.warning('Tenant %(tenant)s has no available aggregates',
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{'tenant': request_spec.project_id})
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raise exception.RequestFilterFailed(
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reason=_('No hosts available for tenant'))
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def map_az_to_placement_aggregate(ctxt, request_spec):
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"""Map requested nova availability zones to placement aggregates.
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This will modify request_spec to request hosts in an aggregate that
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matches the desired AZ of the user's request.
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"""
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if not CONF.scheduler.query_placement_for_availability_zone:
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return
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az_hint = request_spec.availability_zone
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if not az_hint:
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return
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aggregates = objects.AggregateList.get_by_metadata(ctxt,
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key='availability_zone',
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value=az_hint)
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if aggregates:
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if ('requested_destination' not in request_spec or
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request_spec.requested_destination is None):
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request_spec.requested_destination = objects.Destination()
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request_spec.requested_destination.require_aggregates(
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[agg.uuid for agg in aggregates])
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ALL_REQUEST_FILTERS = [
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require_tenant_aggregate,
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map_az_to_placement_aggregate,
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]
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def process_reqspec(ctxt, request_spec):
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"""Process an objects.ReqestSpec before calling placement.
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:param ctxt: A RequestContext
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:param request_spec: An objects.RequestSpec to be inspected/modified
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"""
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for filter in ALL_REQUEST_FILTERS:
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filter(ctxt, request_spec)
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