133 lines
4.1 KiB
Python
133 lines
4.1 KiB
Python
# Copyright 2015 Huawei Technologies Co., Ltd.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from socket import gethostname
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from oslo_config import cfg
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from nova import exception
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from nova import objects
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from nova.scheduler import driver
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from nova.scheduler.manager import SchedulerManager
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from tricircle.common.utils import get_import_path
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from tricircle.cascade_service import site_manager
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from tricircle.cascade_service.compute import NovaService
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cfg.CONF.import_opt('scheduler_topic', 'nova.scheduler.rpcapi')
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_REPORT_INTERVAL = 30
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_REPORT_INTERVAL_MAX = 60
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def _get_import_path(klass):
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return "%s.%s" % (klass.__module__, klass.__name__)
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def create_server():
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return NovaService(
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host=gethostname(),
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binary="nova-scheduler",
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topic="scheduler", # TODO(saggi): get from conf
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db_allowed=False,
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periodic_enable=True,
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report_interval=_REPORT_INTERVAL,
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periodic_interval_max=_REPORT_INTERVAL_MAX,
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manager=get_import_path(SchedulerManager),
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scheduler_driver=get_import_path(TricircleSchedulerDriver),
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)
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class _AvailabilityZone(object):
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def __init__(self, name, host_manager):
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self.name = name
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self._host_manager = host_manager
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self._site_manager = site_manager.get_instance()
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@property
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def host_aggregates(self):
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for aggregate in self._host_manager.aggregates:
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if aggregate.metadata[u'availability_zone'] == self.name:
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yield aggregate
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@property
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def member_hosts(self):
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for aggregate in self.host_aggregates:
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for host in aggregate.hosts:
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yield host
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@property
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def valid_sites(self):
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for host in self.member_hosts:
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yield self._site_manager.get_site(host)
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class _HostManager(object):
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def __init__(self):
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self.aggregates = []
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# Required methods from OpenStack interface
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def update_aggregates(self, aggregates):
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# This is not called reliably enough to trust
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# we just reload the aggregates on every call
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pass
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def delete_aggregate(self, aggregate):
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# This is not called reliably enough to trust
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# we just reload the aggregates on every call
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pass
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def update_instance_info(self, context, host_name, instance_info):
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pass
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def delete_instance_info(self, context, host_name, instance_uuid):
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pass
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def sync_instance_info(self, context, host_name, instance_uuids):
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pass
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# Tricircle only methods
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def get_availability_zone(self, az_name):
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return _AvailabilityZone(az_name, self)
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def reload_aggregates(self, context):
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self.aggregates = objects.AggregateList.get_all(context)
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class TricircleSchedulerDriver(driver.Scheduler):
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def __init__(self):
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super(TricircleSchedulerDriver, self).__init__()
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self.host_manager = _HostManager()
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self._site_manager = site_manager.get_instance()
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def select_destinations(self, ctxt, request_spec, filter_properties):
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self.host_manager.reload_aggregates(ctxt)
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availability_zone = self.host_manager.get_availability_zone(
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request_spec[u'instance_properties'][u'availability_zone'])
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for site in availability_zone.valid_sites:
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site.prepare_for_instance(request_spec, filter_properties)
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return [{
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'host': site.name,
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'nodename': site.get_nodes()[0].hypervisor_hostname,
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'limits': None,
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}]
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else:
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raise exception.NoValidHost(
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"No sites match requested availability zone")
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