96 lines
3.5 KiB
Python
96 lines
3.5 KiB
Python
# 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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Scheduler base class that all Schedulers should inherit from
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"""
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from oslo_config import cfg
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from oslo_utils import importutils
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from oslo_utils import timeutils
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from manila import db
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from manila.i18n import _
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from manila.share import rpcapi as share_rpcapi
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from manila import utils
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scheduler_driver_opts = [
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cfg.StrOpt('scheduler_host_manager',
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default='manila.scheduler.host_manager.HostManager',
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help='The scheduler host manager class to use.'),
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cfg.IntOpt('scheduler_max_attempts',
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default=3,
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help='Maximum number of attempts to schedule a share.'),
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]
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CONF = cfg.CONF
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CONF.register_opts(scheduler_driver_opts)
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def share_update_db(context, share_id, host):
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'''Set the host and set the scheduled_at field of a share.
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:returns: A Share with the updated fields set properly.
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'''
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now = timeutils.utcnow()
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values = {'host': host, 'scheduled_at': now}
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return db.share_update(context, share_id, values)
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class Scheduler(object):
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"""The base class that all Scheduler classes should inherit from."""
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def __init__(self):
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self.host_manager = importutils.import_object(
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CONF.scheduler_host_manager)
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self.share_rpcapi = share_rpcapi.ShareAPI()
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def get_host_list(self):
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"""Get a list of hosts from the HostManager."""
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return self.host_manager.get_host_list()
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def get_service_capabilities(self):
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"""Get the normalized set of capabilities for the services."""
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return self.host_manager.get_service_capabilities()
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def update_service_capabilities(self, service_name, host, capabilities):
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"""Process a capability update from a service node."""
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self.host_manager.update_service_capabilities(service_name,
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host,
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capabilities)
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def hosts_up(self, context, topic):
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"""Return the list of hosts that have a running service for topic."""
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services = db.service_get_all_by_topic(context, topic)
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return [service['host']
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for service in services
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if utils.service_is_up(service)]
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def schedule(self, context, topic, method, *_args, **_kwargs):
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"""Must override schedule method for scheduler to work."""
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raise NotImplementedError(_("Must implement a fallback schedule"))
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def schedule_create_share(self, context, request_spec, filter_properties):
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"""Must override schedule method for scheduler to work."""
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raise NotImplementedError(_("Must implement schedule_create_share"))
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def get_pools(self, context, filters):
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"""Must override schedule method for scheduler to work."""
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raise NotImplementedError(_(
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"Must implement get_pools"))
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