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# Copyright (c) 2012 OpenStack, LLC.
# 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 import cfg
from nova.openstack.common import log as logging
from nova.scheduler import filters
from nova import servicegroup
CONF = cfg.CONF
LOG = logging.getLogger(__name__)
class ComputeFilter(filters.BaseHostFilter):
"""Filter on active Compute nodes."""
def __init__(self):
self.servicegroup_api = servicegroup.API()
def host_passes(self, host_state, filter_properties):
"""Returns True for only active compute nodes."""
capabilities = host_state.capabilities
service = host_state.service
alive = self.servicegroup_api.service_is_up(service)
if not alive or service['disabled']:
LOG.debug(_("%(host_state)s is disabled or has not been "
"heard from in a while"), locals())
return False
if not capabilities.get("enabled", True):
LOG.debug(_("%(host_state)s is disabled via capabilities"),
locals())
return False
return True
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