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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 nova.openstack.common import log as logging
from nova.scheduler import filters
from nova.scheduler.filters import extra_specs_ops
LOG = logging.getLogger(__name__)
class ComputeCapabilitiesFilter(filters.BaseHostFilter):
"""HostFilter hard-coded to work with InstanceType records."""
def _satisfies_extra_specs(self, capabilities, instance_type):
"""Check that the capabilities provided by the compute service
satisfy the extra specs associated with the instance type.
"""
if 'extra_specs' not in instance_type:
return True
for key, req in instance_type['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."""
instance_type = filter_properties.get('instance_type')
if not self._satisfies_extra_specs(host_state.capabilities,
instance_type):
LOG.debug(_("%(host_state)s fails instance_type extra_specs "
"requirements"), {'host_state': host_state})
return False
return True
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