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# Copyright (c) 2011 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 openstack.common import log as logging
from openstack.common.scheduler import filters
from openstack.common.scheduler.filters import extra_specs_ops
LOG = logging.getLogger(__name__)
class CapabilitiesFilter(filters.BaseHostFilter):
"""HostFilter to work with resource (instance & volume) type records."""
def _satisfies_extra_specs(self, capabilities, resource_type):
"""Check that the capabilities provided by the services
satisfy the extra specs associated with the instance type"""
extra_specs = resource_type.get('extra_specs', [])
if not extra_specs:
return True
for key, req in extra_specs.iteritems():
# Either not scope format, or in capabilities scope
scope = key.split(':')
if len(scope) > 1 and scope[0] != "capabilities":
continue
elif scope[0] == "capabilities":
del scope[0]
cap = capabilities
for index in range(0, len(scope)):
try:
cap = cap.get(scope[index], None)
except AttributeError:
return False
if cap is None:
return False
if not extra_specs_ops.match(cap, req):
return False
return True
def host_passes(self, host_state, filter_properties):
"""Return a list of hosts that can create instance_type."""
# Note(zhiteng) Currently only Cinder and Nova are using
# this filter, so the resource type is either instance or
# volume.
resource_type = filter_properties.get('resource_type')
if not self._satisfies_extra_specs(host_state.capabilities,
resource_type):
return False
return True
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