108 lines
3.7 KiB
Python
108 lines
3.7 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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import six
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from oslo_log import log as logging
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from manila.scheduler.evaluator import evaluator
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from manila.scheduler.filters import base_host
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from manila.scheduler import utils
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LOG = logging.getLogger(__name__)
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class DriverFilter(base_host.BaseHostFilter):
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"""DriverFilter filters hosts based on a 'filter function' and metrics.
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DriverFilter filters based on share host's provided 'filter function'
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and metrics.
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"""
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def host_passes(self, host_state, filter_properties):
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"""Determines whether a host has a passing filter_function or not."""
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stats = self._generate_stats(host_state, filter_properties)
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LOG.debug("Driver Filter: Checking host '%s'",
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stats['host_stats']['host'])
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result = self._check_filter_function(stats)
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LOG.debug("Result: %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_filter_function(self, stats):
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"""Checks if a share passes a host's filter function.
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Returns a tuple in the format (filter_passing, filter_invalid).
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Both values are booleans.
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"""
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if stats['filter_function'] is None:
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LOG.debug("Filter function not set :: passing host.")
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return True
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try:
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filter_result = self._run_evaluator(stats['filter_function'],
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stats)
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except Exception as ex:
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# Warn the admin for now that there is an error in the
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# filter function.
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LOG.warning("Error in filtering function "
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"'%(function)s' : '%(error)s' :: failing host.",
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{'function': stats['filter_function'],
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'error': ex, })
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return False
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msg = "Filter 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(filter_result)}
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LOG.info(msg, args)
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return filter_result
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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, filter_properties):
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"""Generates statistics from host and share data."""
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filter_function = None
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if ('filter_function' in host_state.capabilities and
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host_state.capabilities['filter_function'] is not None):
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filter_function = six.text_type(
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host_state.capabilities['filter_function'])
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stats = utils.generate_stats(host_state, filter_properties)
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stats['filter_function'] = filter_function
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return stats
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