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OpenStack Study: capabilities_filter.py**** CubicPower OpenStack Study ****
# 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. import six from cinder.openstack.common.gettextutils import _ # noqa from cinder.openstack.common import log as logging from cinder.openstack.common.scheduler import filters from cinder.openstack.common.scheduler.filters import extra_specs_ops LOG = logging.getLogger(__name__)
**** CubicPower OpenStack Study **** class CapabilitiesFilter(filters.BaseHostFilter): """HostFilter to work with resource (instance & volume) type records."""
**** CubicPower OpenStack Study **** def _satisfies_extra_specs(self, capabilities, resource_type): """Check that the capabilities provided by the services satisfy the extra specs associated with the resource type. """ extra_specs = resource_type.get('extra_specs', []) if not extra_specs: return True for key, req in six.iteritems(extra_specs): # 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(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): LOG.debug(_("extra_spec requirement '%(req)s' does not match " "'%(cap)s'"), {'req': req, 'cap': cap}) return False return True
**** CubicPower OpenStack Study **** def host_passes(self, host_state, filter_properties): """Return a list of hosts that can create resource_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): LOG.debug(_("%(host_state)s fails resource_type extra_specs " "requirements"), {'host_state': host_state}) return False return True
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