ec2-driver/cloud_burst_filter.py

47 lines
1.7 KiB
Python

# Copyright (c) 2014 ThoughtWorks
# 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 import db
from nova.openstack.common import log as logging
from nova.scheduler import filters
opts = [
cfg.BoolOpt('cloud_burst',
help='Switch to enable could bursting'),
cfg.StrOpt('cloud_burst_availability_zone',
help='The availability zone of only compute hosts with the public cloud driver'),
]
CONF = cfg.CONF
CONF.register_opts(opts)
LOG = logging.getLogger(__name__)
class CloudBurstFilter(filters.BaseHostFilter):
"""Filter for cloud burst availability zone"""
run_filter_once_per_request = True
def host_passes(self, host_state, filter_properties):
context = filter_properties['context'].elevated()
metadata = db.aggregate_metadata_get_by_host(context, host_state.host, key='availability_zone')
if CONF.cloud_burst:
return CONF.cloud_burst_availability_zone in metadata['availability_zone']
else:
return CONF.cloud_burst_availability_zone not in metadata['availability_zone']
return True