117 lines
4.8 KiB
Python
117 lines
4.8 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 oslo_serialization import jsonutils
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import six
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from nova.scheduler import filters
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from nova.scheduler.filters import extra_specs_ops
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LOG = logging.getLogger(__name__)
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class ComputeCapabilitiesFilter(filters.BaseHostFilter):
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"""HostFilter hard-coded to work with InstanceType records."""
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# Instance type and host capabilities do not change within a request
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run_filter_once_per_request = True
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RUN_ON_REBUILD = False
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def _get_capabilities(self, host_state, scope):
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cap = host_state
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for index in range(0, len(scope)):
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try:
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if isinstance(cap, six.string_types):
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try:
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cap = jsonutils.loads(cap)
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except ValueError as e:
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LOG.debug("%(host_state)s fails. The capabilities "
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"'%(cap)s' couldn't be loaded from JSON: "
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"%(error)s",
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{'host_state': host_state, 'cap': cap,
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'error': e})
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return None
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if not isinstance(cap, dict):
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if getattr(cap, scope[index], None) is None:
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# If can't find, check stats dict
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cap = cap.stats.get(scope[index], None)
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else:
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cap = getattr(cap, scope[index], None)
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else:
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cap = cap.get(scope[index], None)
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except AttributeError as e:
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LOG.debug("%(host_state)s fails. The capabilities couldn't "
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"be retrieved: %(error)s.",
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{'host_state': host_state, 'error': e})
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return None
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if cap is None:
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LOG.debug("%(host_state)s fails. There are no capabilities "
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"to retrieve.",
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{'host_state': host_state})
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return None
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return cap
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def _satisfies_extra_specs(self, host_state, instance_type):
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"""Check that the host_state provided by the compute service
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satisfies the extra specs associated with the instance type.
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"""
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if 'extra_specs' not in instance_type:
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return True
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for key, req in instance_type.extra_specs.items():
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# Either not scope format, or in capabilities scope
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scope = key.split(':')
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# If key does not have a namespace, the scope's size is 1, check
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# whether host_state contains the key as an attribute. If not,
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# ignore it. If it contains, deal with it in the same way as
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# 'capabilities:key'. This is for backward-compatible.
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# If the key has a namespace, the scope's size will be bigger than
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# 1, check that whether the namespace is 'capabilities'. If not,
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# ignore it.
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if len(scope) == 1:
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stats = getattr(host_state, 'stats', {})
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has_attr = hasattr(host_state, key) or key in stats
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if not has_attr:
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continue
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else:
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if scope[0] != "capabilities":
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continue
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else:
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del scope[0]
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cap = self._get_capabilities(host_state, scope)
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if cap is None:
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return False
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if not extra_specs_ops.match(str(cap), req):
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LOG.debug("%(host_state)s fails extra_spec requirements. "
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"'%(req)s' does not match '%(cap)s'",
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{'host_state': host_state, 'req': req,
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'cap': cap})
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return False
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return True
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def host_passes(self, host_state, spec_obj):
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"""Return a list of hosts that can create instance_type."""
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instance_type = spec_obj.flavor
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if not self._satisfies_extra_specs(host_state, instance_type):
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LOG.debug("%(host_state)s fails instance_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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