51418bdd5b
Along with moving to pep8 1.3.3, we also want to standardize on what we ignore. This patch get's us most of the way there by setting the ignore list to: N4,E125, E126, E711,E712. Almost all changes made here are white-space/indentation changes. The removal of Hacking N4 errors from the ignore list will be handled in a seperate patch. Change-Id: If45f156600485d23769449018590f60b4f69b0c5
92 lines
3.8 KiB
Python
92 lines
3.8 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright (c) 2010 OpenStack, LLC.
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# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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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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Simple Scheduler
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"""
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from cinder import db
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from cinder import exception
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from cinder import flags
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from cinder.openstack.common import cfg
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from cinder.scheduler import chance
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from cinder.scheduler import driver
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from cinder import utils
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simple_scheduler_opts = [
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cfg.IntOpt("max_gigabytes",
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default=10000,
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help="maximum number of volume gigabytes to allow per host"), ]
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FLAGS = flags.FLAGS
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FLAGS.register_opts(simple_scheduler_opts)
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class SimpleScheduler(chance.ChanceScheduler):
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"""Implements Naive Scheduler that tries to find least loaded host."""
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def schedule_create_volume(self, context, request_spec, filter_properties):
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"""Picks a host that is up and has the fewest volumes."""
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elevated = context.elevated()
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volume_id = request_spec.get('volume_id')
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snapshot_id = request_spec.get('snapshot_id')
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image_id = request_spec.get('image_id')
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volume_properties = request_spec.get('volume_properties')
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volume_size = volume_properties.get('size')
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availability_zone = volume_properties.get('availability_zone')
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zone, host = None, None
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if availability_zone:
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zone, _x, host = availability_zone.partition(':')
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if host and context.is_admin:
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topic = FLAGS.volume_topic
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service = db.service_get_by_args(elevated, host, topic)
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if not utils.service_is_up(service):
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raise exception.WillNotSchedule(host=host)
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updated_volume = driver.volume_update_db(context, volume_id, host)
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self.volume_rpcapi.create_volume(context,
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updated_volume,
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host,
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snapshot_id,
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image_id)
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return None
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results = db.service_get_all_volume_sorted(elevated)
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if zone:
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results = [(service, gigs) for (service, gigs) in results
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if service['availability_zone'] == zone]
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for result in results:
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(service, volume_gigabytes) = result
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if volume_gigabytes + volume_size > FLAGS.max_gigabytes:
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msg = _("Not enough allocatable volume gigabytes remaining")
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raise exception.NoValidHost(reason=msg)
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if utils.service_is_up(service) and not service['disabled']:
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updated_volume = driver.volume_update_db(context, volume_id,
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service['host'])
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self.volume_rpcapi.create_volume(context,
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updated_volume,
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service['host'],
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snapshot_id,
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image_id)
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return None
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msg = _("Is the appropriate service running?")
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raise exception.NoValidHost(reason=msg)
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