48 lines
1.5 KiB
Python
48 lines
1.5 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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Weigh cells by their weight_offset in the DB. Cells with higher
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weight_offsets in the DB will be preferred.
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"""
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from oslo.config import cfg
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from nova.cells import weights
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weigher_opts = [
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cfg.FloatOpt('offset_weight_multiplier',
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default=1.0,
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help='Multiplier used to weigh offset weigher.'),
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]
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CONF = cfg.CONF
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CONF.register_opts(weigher_opts, group='cells')
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class WeightOffsetWeigher(weights.BaseCellWeigher):
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"""
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Weight cell by weight_offset db field.
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Originally designed so you can set a default cell by putting
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its weight_offset to 999999999999999 (highest weight wins)
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"""
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def weight_multiplier(self):
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return CONF.cells.offset_weight_multiplier
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def _weigh_object(self, cell, weight_properties):
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"""Returns whatever was in the DB for weight_offset."""
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return cell.db_info.get('weight_offset', 0)
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