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- # Copyright (c) 2011 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.
- """
- The Host Filter classes are a way to ensure that only hosts that are
- appropriate are considered when creating a new instance. Hosts that are
- either incompatible or insufficient to accept a newly-requested instance
- are removed by Host Filter classes from consideration. Those that pass
- the filter are then passed on for weighting or other process for ordering.
- Filters are in the 'filters' directory that is off the 'scheduler'
- directory of nova. Additional filters can be created and added to that
- directory; be sure to add them to the filters/__init__.py file so that
- they are part of the nova.schedulers.filters namespace.
- """
- import types
- from nova import exception
- from nova import flags
- import nova.scheduler
- from nova import log as logging
- LOG = logging.getLogger('nova.scheduler.CLOUDBUILDERS')
- # NOTE(Vek): Even though we don't use filters in here anywhere, we
- # depend on default_host_filter being available in FLAGS,
- # and that happens only when filters/abstract_filter.py is
- # imported.
- from nova.scheduler import filters
- FLAGS = flags.FLAGS
- def _get_filters():
- # Imported here to avoid circular imports
- from nova.scheduler import filters
- def get_itm(nm):
- return getattr(filters, nm)
- return [get_itm(itm) for itm in dir(filters)
- if (type(get_itm(itm)) is types.TypeType)
- and issubclass(get_itm(itm), filters.AbstractHostFilter)
- and get_itm(itm) is not filters.AbstractHostFilter]
- def choose_host_filter(filter_name=None):
- """Since the caller may specify which filter to use we need
- to have an authoritative list of what is permissible. This
- function checks the filter name against a predefined set
- of acceptable filters.
- """
- if not filter_name:
- filter_name = FLAGS.default_host_filter
- LOG.debug(_("#1 ---> FILTER ON NOVA.CONF : %s"), (filter_name))
- for filter_class in _get_filters():
- LOG.debug(_("#2 ---> FILTER BEING READ : %s"), (filter_class.__name__))
- if filter_class.__name__ == filter_name:
- return filter_class()
- raise exception.SchedulerHostFilterNotFound(filter_name=filter_name)
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