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OpenStack Study: compute_filter.py**** CubicPower OpenStack Study ****
# Copyright (c) 2012 OpenStack Foundation # 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.config import cfg from nova.openstack.common.gettextutils import _ from nova.openstack.common import log as logging from nova.scheduler import filters from nova import servicegroup CONF = cfg.CONF LOG = logging.getLogger(__name__)
**** CubicPower OpenStack Study **** class ComputeFilter(filters.BaseHostFilter): """Filter on active Compute nodes."""
**** CubicPower OpenStack Study **** def __init__(self): self.servicegroup_api = servicegroup.API() # Host state does not change within a request run_filter_once_per_request = True
**** CubicPower OpenStack Study **** def host_passes(self, host_state, filter_properties): """Returns True for only active compute nodes.""" service = host_state.service if service['disabled']: LOG.debug(_("%(host_state)s is disabled, reason: %(reason)s"), {'host_state': host_state, 'reason': service.get('disabled_reason')}) return False else: if not self.servicegroup_api.service_is_up(service): LOG.warn(_("%(host_state)s has not been heard from in a " "while"), {'host_state': host_state}) return False return True
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