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OpenStack Study: compute_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. from nova.openstack.common.gettextutils import _ 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__)
**** CubicPower OpenStack Study **** class ComputeCapabilitiesFilter(filters.BaseHostFilter): """HostFilter hard-coded to work with InstanceType records.""" # Instance type and host capabilities do not change within a request run_filter_once_per_request = True
**** CubicPower OpenStack Study **** def _satisfies_extra_specs(self, host_state, instance_type): """Check that the host_state 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: if scope[0] != "capabilities": continue else: del scope[0] cap = host_state for index in range(0, len(scope)): try: if not isinstance(cap, dict): if getattr(cap, scope[index], None) is None: # If can't find, check stats dict cap = cap.stats.get(scope[index], None) else: cap = getattr(cap, scope[index], None) else: cap = cap.get(scope[index], None) except AttributeError: return False if cap is None: return False if not extra_specs_ops.match(str(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 instance_type.""" instance_type = filter_properties.get('instance_type') if not self._satisfies_extra_specs(host_state, 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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