ee344a3b8c
If a scheduler RPC message isn't handled directly by a SchedulerManager
method, the __getattr__() fallback passes the message to a driver
method in the form of schedule_${method}() and, if that doesn't exist,
instead calls the schedule() method supplying the topic and method
args.
This is pretty bizarre stuff and we appear to only use it in two cases:
1) live_migration - this is how the schedule_live_migration()
method in the driver gets called, but the side-effect is that
we require the client to pass a topic argument which is never
used. This would be much more sanely handled with an explicit
SchedulerManager.live_migration() method.
2) create_volume - the volume API asks the scheduler to pick a
target host for create_volume() using this method. This would
be easily handled with an SchedulerManager.create_volume()
method.
Change-Id: I1047489d85ac51d8d36fea1c4eb858df638ce349
98 lines
4.0 KiB
Python
98 lines
4.0 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2012, Red Hat, Inc.
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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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Client side of the scheduler manager RPC API.
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"""
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from nova import flags
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from nova.openstack.common import jsonutils
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import nova.openstack.common.rpc.proxy
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FLAGS = flags.FLAGS
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class SchedulerAPI(nova.openstack.common.rpc.proxy.RpcProxy):
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'''Client side of the scheduler rpc API.
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API version history:
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1.0 - Initial version.
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1.1 - Changes to prep_resize():
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- remove instance_uuid, add instance
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- remove instance_type_id, add instance_type
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- remove topic, it was unused
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1.2 - Remove topic from run_instance, it was unused
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1.3 - Remove instance_id, add instance to live_migration
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1.4 - Remove update_db from prep_resize
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1.5 - Add reservations argument to prep_resize()
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1.6 - Remove reservations argument to run_instance()
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1.7 - Add create_volume() method, remove topic from live_migration()
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'''
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BASE_RPC_API_VERSION = '1.0'
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def __init__(self):
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super(SchedulerAPI, self).__init__(topic=FLAGS.scheduler_topic,
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default_version=self.BASE_RPC_API_VERSION)
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def run_instance(self, ctxt, request_spec, admin_password,
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injected_files, requested_networks, is_first_time,
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filter_properties):
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return self.cast(ctxt, self.make_msg('run_instance',
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request_spec=request_spec, admin_password=admin_password,
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injected_files=injected_files,
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requested_networks=requested_networks,
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is_first_time=is_first_time,
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filter_properties=filter_properties), version='1.6')
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def prep_resize(self, ctxt, instance, instance_type, image,
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request_spec, filter_properties, reservations):
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instance_p = jsonutils.to_primitive(instance)
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instance_type_p = jsonutils.to_primitive(instance_type)
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self.cast(ctxt, self.make_msg('prep_resize',
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instance=instance_p, instance_type=instance_type_p,
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image=image, request_spec=request_spec,
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filter_properties=filter_properties,
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reservations=reservations), version='1.5')
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def show_host_resources(self, ctxt, host):
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return self.call(ctxt, self.make_msg('show_host_resources', host=host))
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def live_migration(self, ctxt, block_migration, disk_over_commit,
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instance, dest):
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# NOTE(comstud): Call vs cast so we can get exceptions back, otherwise
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# this call in the scheduler driver doesn't return anything.
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instance_p = jsonutils.to_primitive(instance)
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return self.call(ctxt, self.make_msg('live_migration',
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block_migration=block_migration,
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disk_over_commit=disk_over_commit, instance=instance_p,
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dest=dest), version='1.7')
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def create_volume(self, ctxt, volume_id, snapshot_id, reservations):
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self.cast(ctxt,
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self.make_msg('create_volume',
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volume_id=volume_id, snapshot_id=snapshot_id,
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reservations=reservations),
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version='1.7')
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def update_service_capabilities(self, ctxt, service_name, host,
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capabilities):
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self.fanout_cast(ctxt, self.make_msg('update_service_capabilities',
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service_name=service_name, host=host,
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capabilities=capabilities))
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