104 lines
4.3 KiB
Python
104 lines
4.3 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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from oslo_log import log as logging
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from cinder.objects.fields import VolumeAttachStatus
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from cinder.scheduler import filters
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from cinder.scheduler.filters import extra_specs_ops
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LOG = logging.getLogger(__name__)
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class CapabilitiesFilter(filters.BaseBackendFilter):
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"""BackendFilter to work with resource (instance & volume) type records."""
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def _satisfies_extra_specs(self, capabilities, filter_properties):
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"""Check if capabilities satisfy resource type requirements.
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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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req_spec = filter_properties.get('request_spec')
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if req_spec and req_spec.get('operation') == 'extend_volume':
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# NOTE(erlon): By default, cinder considers that every backend
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# supports volume online extending. Those backends that don't
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# support it should report online_extend_support=False.
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online_extends = capabilities.get('online_extend_support', True)
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if online_extends is False:
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vol_prop = req_spec.get('volume_properties')
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attach_status = vol_prop.get('attach_status')
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if attach_status != VolumeAttachStatus.DETACHED:
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LOG.debug("Backend doesn't support attached volume extend")
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return False
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resource_type = filter_properties.get('resource_type')
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if not resource_type:
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return True
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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 extra_specs.items():
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# Either not scoped format, or in capabilities scope
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scope = key.split(':')
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# Ignore scoped (such as vendor-specific) capabilities
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if len(scope) > 1 and scope[0] != "capabilities":
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continue
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# Strip off prefix if spec started with 'capabilities:'
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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[scope[index]]
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except (TypeError, KeyError):
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LOG.debug("Backend doesn't provide capability '%(cap)s' ",
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{'cap': scope[index]})
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return False
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# Make all capability values a list so we can handle lists
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cap_list = [cap] if not isinstance(cap, list) else cap
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# Loop through capability values looking for any match
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for cap_value in cap_list:
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if extra_specs_ops.match(cap_value, req):
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break
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else:
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# Nothing matched, so bail out
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LOG.debug('Volume type extra spec requirement '
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'"%(key)s=%(req)s" does not match reported '
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'capability "%(cap)s"',
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{'key': key, 'req': req, 'cap': cap})
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return False
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return True
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def backend_passes(self, backend_state, filter_properties):
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"""Return a list of backends 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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if not self._satisfies_extra_specs(backend_state.capabilities,
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filter_properties):
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LOG.debug("%(backend_state)s fails resource_type extra_specs "
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"requirements", {'backend_state': backend_state})
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return False
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return True
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