65 lines
2.4 KiB
Python
65 lines
2.4 KiB
Python
# Copyright (c) 2011 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.
|
|
|
|
"""
|
|
Scheduler host filters
|
|
"""
|
|
from nova import filters
|
|
|
|
|
|
class BaseHostFilter(filters.BaseFilter):
|
|
"""Base class for host filters."""
|
|
|
|
# This is set to True if this filter should be run for rebuild.
|
|
# For example, with rebuild, we need to ask the scheduler if the
|
|
# existing host is still legit for a rebuild with the new image and
|
|
# other parameters. We care about running policy filters (i.e.
|
|
# ImagePropertiesFilter) but not things that check usage on the
|
|
# existing compute node, etc.
|
|
RUN_ON_REBUILD = False
|
|
|
|
def _filter_one(self, obj, spec):
|
|
"""Return True if the object passes the filter, otherwise False."""
|
|
# Do this here so we don't get scheduler.filters.utils
|
|
from nova.scheduler import utils
|
|
if not self.RUN_ON_REBUILD and utils.request_is_rebuild(spec):
|
|
# If we don't filter, default to passing the host.
|
|
return True
|
|
else:
|
|
# We are either a rebuild filter, in which case we always run,
|
|
# or this request is not rebuild in which case all filters
|
|
# should run.
|
|
return self.host_passes(obj, spec)
|
|
|
|
def host_passes(self, host_state, filter_properties):
|
|
"""Return True if the HostState passes the filter, otherwise False.
|
|
Override this in a subclass.
|
|
"""
|
|
raise NotImplementedError()
|
|
|
|
|
|
class HostFilterHandler(filters.BaseFilterHandler):
|
|
def __init__(self):
|
|
super(HostFilterHandler, self).__init__(BaseHostFilter)
|
|
|
|
|
|
def all_filters():
|
|
"""Return a list of filter classes found in this directory.
|
|
|
|
This method is used as the default for available scheduler filters
|
|
and should return a list of all filter classes available.
|
|
"""
|
|
return HostFilterHandler().get_all_classes()
|