cd09242ba5
Log messages are no longer being translated. This removes all use of the _LE, _LI, and _LW translation markers to simplify logging and to avoid confusion with new contributions. This is the 3/5 commit. Old commit will be abandoned: https://review.openstack.org/#/c/447822/ See: http://lists.openstack.org/pipermail/openstack-i18n/2016-November/002574.html http://lists.openstack.org/pipermail/openstack-dev/2017-March/113365.html Change-Id: I0c1dd123ce8d08c797780c7706c684a939371719 Depends-On: I9fd264a443c634465b8548067f86ac14c1a51faa Partial-Bug: #1674542
124 lines
4.3 KiB
Python
124 lines
4.3 KiB
Python
# Copyright (c) 2014 Hewlett-Packard Development Company, L.P.
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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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from oslo_log import log as logging
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import six
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from manila.scheduler.evaluator import evaluator
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from manila.scheduler import utils
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from manila.scheduler.weighers import base_host
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LOG = logging.getLogger(__name__)
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class GoodnessWeigher(base_host.BaseHostWeigher):
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"""Goodness Weigher. Assign weights based on a host's goodness function.
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Goodness rating is the following:
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.. code-block:: none
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0 -- host is a poor choice
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.
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.
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50 -- host is a good choice
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.
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.
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100 -- host is a perfect choice
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"""
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def _weigh_object(self, host_state, weight_properties):
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"""Determine host's goodness rating based on a goodness_function."""
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stats = self._generate_stats(host_state, weight_properties)
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LOG.debug("Checking host '%s'", stats['host_stats']['host'])
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result = self._check_goodness_function(stats)
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LOG.debug("Goodness: %s", result)
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LOG.debug("Done checking host '%s'", stats['host_stats']['host'])
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return result
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def _check_goodness_function(self, stats):
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"""Gets a host's goodness rating based on its goodness function."""
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goodness_rating = 0
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if stats['goodness_function'] is None:
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LOG.warning("Goodness function not set :: defaulting to "
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"minimal goodness rating of 0.")
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else:
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try:
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goodness_result = self._run_evaluator(
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stats['goodness_function'],
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stats)
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except Exception as ex:
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LOG.warning("Error in goodness_function function "
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"'%(function)s' : '%(error)s' :: Defaulting "
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"to a goodness of 0.",
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{'function': stats['goodness_function'],
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'error': ex, })
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return goodness_rating
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if type(goodness_result) is bool:
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if goodness_result:
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goodness_rating = 100
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elif goodness_result < 0 or goodness_result > 100:
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LOG.warning("Invalid goodness result. Result must be "
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"between 0 and 100. Result generated: '%s' "
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":: Defaulting to a goodness of 0.",
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goodness_result)
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else:
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goodness_rating = goodness_result
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msg = "Goodness function result for host %(host)s: %(result)s."
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args = {'host': stats['host_stats']['host'],
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'result': six.text_type(goodness_rating)}
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LOG.info(msg, args)
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return goodness_rating
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def _run_evaluator(self, func, stats):
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"""Evaluates a given function using the provided available stats."""
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host_stats = stats['host_stats']
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host_caps = stats['host_caps']
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extra_specs = stats['extra_specs']
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share_stats = stats['share_stats']
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result = evaluator.evaluate(
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func,
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extra=extra_specs,
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stats=host_stats,
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capabilities=host_caps,
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share=share_stats)
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return result
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def _generate_stats(self, host_state, weight_properties):
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"""Generates statistics from host and share data."""
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goodness_function = None
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if ('goodness_function' in host_state.capabilities and
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host_state.capabilities['goodness_function'] is not None):
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goodness_function = six.text_type(
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host_state.capabilities['goodness_function'])
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stats = utils.generate_stats(host_state, weight_properties)
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stats['goodness_function'] = goodness_function
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return stats
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