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# Copyright (c) 2014 Intel, Inc.
# 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 oslo_log import log as logging
import nova.conf
from nova.scheduler import filters
from nova.scheduler import utils
LOG = logging.getLogger(__name__)
CONF = nova.conf.CONF
class MetricsFilter(filters.BaseHostFilter):
"""Metrics Filter
This filter is used to filter out those hosts which don't have the
corresponding metrics so these the metrics weigher won't fail due to
these hosts.
"""
RUN_ON_REBUILD = False
def __init__(self):
super(MetricsFilter, self).__init__()
opts = utils.parse_options(CONF.metrics.weight_setting,
sep='=',
converter=float,
name="metrics.weight_setting")
self.keys = set([x[0] for x in opts])
def host_passes(self, host_state, spec_obj):
metrics_on_host = set(m.name for m in host_state.metrics)
if not self.keys.issubset(metrics_on_host):
unavail = metrics_on_host - self.keys
LOG.debug("%(host_state)s does not have the following "
"metrics: %(metrics)s",
{'host_state': host_state,
'metrics': ', '.join(unavail)})
return False
return True
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