60 lines
2.0 KiB
Python
60 lines
2.0 KiB
Python
# Copyright (c) 2012-2013 Rackspace Hosting
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""
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Cell scheduler filters
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"""
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from nova import filters
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from nova import policy
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class BaseCellFilter(filters.BaseFilter):
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"""Base class for cell filters."""
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def authorized(self, ctxt):
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"""Return whether or not the context is authorized for this filter
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based on policy.
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The policy action is "cells_scheduler_filter:<name>" where <name>
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is the name of the filter class.
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"""
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name = 'cells_scheduler_filter:' + self.__class__.__name__
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target = {'project_id': ctxt.project_id,
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'user_id': ctxt.user_id}
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return policy.enforce(ctxt, name, target, do_raise=False)
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def _filter_one(self, cell, filter_properties):
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return self.cell_passes(cell, filter_properties)
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def cell_passes(self, cell, filter_properties):
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"""Return True if the CellState passes the filter, otherwise False.
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Override this in a subclass.
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"""
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raise NotImplementedError()
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class CellFilterHandler(filters.BaseFilterHandler):
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def __init__(self):
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super(CellFilterHandler, self).__init__(BaseCellFilter)
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def all_filters():
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"""Return a list of filter classes found in this directory.
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This method is used as the default for available scheduler filters
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and should return a list of all filter classes available.
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"""
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return CellFilterHandler().get_all_classes()
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