77 lines
2.9 KiB
Python
77 lines
2.9 KiB
Python
# Copyright (c) 2011 OpenStack Foundation.
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# All Rights Reserved.
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#
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# 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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import logging
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import six
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from manila.scheduler.filters import base_host
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from manila.scheduler.filters import extra_specs_ops
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LOG = logging.getLogger(__name__)
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class CapabilitiesFilter(base_host.BaseHostFilter):
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"""HostFilter to work with resource (instance & volume) type records."""
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def _satisfies_extra_specs(self, capabilities, resource_type):
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"""Compare capabilities against extra specs.
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Check that the capabilities provided by the services satisfy
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the extra specs associated with the resource type.
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"""
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extra_specs = resource_type.get('extra_specs', [])
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if not extra_specs:
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return True
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for key, req in six.iteritems(extra_specs):
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# Either not scope format, or in capabilities scope
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scope = key.split(':')
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if len(scope) > 1 and scope[0] != "capabilities":
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continue
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elif scope[0] == "capabilities":
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del scope[0]
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cap = capabilities
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for index in range(len(scope)):
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try:
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cap = cap.get(scope[index])
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except AttributeError:
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cap = None
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if cap is None:
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LOG.debug("Host doesn't provide capability '%(cap)s' "
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"listed in the extra specs",
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{'cap': scope[index]})
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return False
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if not extra_specs_ops.match(cap, req):
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LOG.debug("extra_spec requirement '%(req)s' "
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"does not match '%(cap)s'",
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{'req': req, 'cap': cap})
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return False
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return True
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def host_passes(self, host_state, filter_properties):
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"""Return a list of hosts that can create resource_type."""
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# Note(zhiteng) Currently only Cinder and Nova are using
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# this filter, so the resource type is either instance or
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# volume.
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resource_type = filter_properties.get('resource_type')
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if not self._satisfies_extra_specs(host_state.capabilities,
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resource_type):
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LOG.debug("%(host_state)s fails resource_type extra_specs "
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"requirements", {'host_state': host_state})
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return False
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return True
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