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affinity_filter.py
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/
affinity_filter.py
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# Copyright 2012, Piston Cloud Computing, Inc.
# Copyright 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.
import netaddr
from nova.compute import api as compute
from nova import flags
from nova.scheduler import filters
class AffinityFilter(filters.BaseHostFilter):
def __init__(self):
self.compute_api = compute.API()
def _all_hosts(self, context):
all_hosts = {}
for instance in self.compute_api.get_all(context):
all_hosts[instance['uuid']] = instance['host']
return all_hosts
class DifferentHostFilter(AffinityFilter):
'''Schedule the instance on a different host from a set of instances.'''
def host_passes(self, host_state, filter_properties):
context = filter_properties['context']
scheduler_hints = filter_properties['scheduler_hints']
me = host_state.host
affinity_uuids = scheduler_hints.get('different_host', [])
if affinity_uuids:
all_hosts = self._all_hosts(context)
return not any([i for i in affinity_uuids
if all_hosts.get(i) == me])
# With no different_host key
return True
class SameHostFilter(AffinityFilter):
'''Schedule the instance on the same host as another instance in a set of
of instances.
'''
def host_passes(self, host_state, filter_properties):
context = filter_properties['context']
scheduler_hints = filter_properties['scheduler_hints']
me = host_state.host
affinity_uuids = scheduler_hints.get('same_host', [])
if affinity_uuids:
all_hosts = self._all_hosts(context)
return any([i for i in affinity_uuids
if all_hosts.get(i) == me])
# With no same_host key
return True
class SimpleCIDRAffinityFilter(AffinityFilter):
def host_passes(self, host_state, filter_properties):
scheduler_hints = filter_properties['scheduler_hints']
affinity_cidr = scheduler_hints.get('cidr', '/24')
affinity_host_addr = scheduler_hints.get('build_near_host_ip')
if affinity_host_addr:
affinity_net = netaddr.IPNetwork(str.join('', (affinity_host_addr,
affinity_cidr)))
return netaddr.IPAddress(flags.FLAGS.my_ip) in affinity_net
# We don't have an affinity host address.
return True