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# Copyright 2012 IBM Corp.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""Handles all requests to the conductor service."""
from oslo_log import log as logging
import oslo_messaging as messaging
from nova import baserpc
from nova.conductor import rpcapi
import nova.conf
from nova.image import glance
CONF = nova.conf.CONF
LOG = logging.getLogger(__name__)
class API(object):
"""Conductor API that does updates via RPC to the ConductorManager."""
def __init__(self):
self.conductor_rpcapi = rpcapi.ConductorAPI()
self.base_rpcapi = baserpc.BaseAPI(topic=rpcapi.RPC_TOPIC)
def object_backport_versions(self, context, objinst, object_versions):
return self.conductor_rpcapi.object_backport_versions(context, objinst,
object_versions)
def wait_until_ready(self, context, early_timeout=10, early_attempts=10):
'''Wait until a conductor service is up and running.
This method calls the remote ping() method on the conductor topic until
it gets a response. It starts with a shorter timeout in the loop
(early_timeout) up to early_attempts number of tries. It then drops
back to the globally configured timeout for rpc calls for each retry.
'''
attempt = 0
timeout = early_timeout
# if we show the timeout message, make sure we show a similar
# message saying that everything is now working to avoid
# confusion
has_timedout = False
while True:
# NOTE(danms): Try ten times with a short timeout, and then punt
# to the configured RPC timeout after that
if attempt == early_attempts:
timeout = None
attempt += 1
# NOTE(russellb): This is running during service startup. If we
# allow an exception to be raised, the service will shut down.
# This may fail the first time around if nova-conductor wasn't
# running when this service started.
try:
self.base_rpcapi.ping(context, '1.21 GigaWatts',
timeout=timeout)
if has_timedout:
LOG.info('nova-conductor connection '
'established successfully')
break
except messaging.MessagingTimeout:
has_timedout = True
LOG.warning('Timed out waiting for nova-conductor. '
'Is it running? Or did this service start '
'before nova-conductor? '
'Reattempting establishment of '
'nova-conductor connection...')
class ComputeTaskAPI(object):
"""ComputeTask API that queues up compute tasks for nova-conductor."""
def __init__(self):
self.conductor_compute_rpcapi = rpcapi.ComputeTaskAPI()
self.image_api = glance.API()
# TODO(stephenfin): Remove the 'reservations' parameter since we don't use
# reservations anymore
def resize_instance(self, context, instance, scheduler_hint, flavor,
reservations=None, clean_shutdown=True,
request_spec=None, host_list=None, do_cast=False):
self.conductor_compute_rpcapi.migrate_server(
context, instance, scheduler_hint, live=False, rebuild=False,
flavor=flavor, block_migration=None, disk_over_commit=None,
reservations=reservations, clean_shutdown=clean_shutdown,
request_spec=request_spec, host_list=host_list,
do_cast=do_cast)
def live_migrate_instance(self, context, instance, host_name,
block_migration, disk_over_commit,
request_spec=None, async_=False):
scheduler_hint = {'host': host_name}
if async_:
self.conductor_compute_rpcapi.live_migrate_instance(
context, instance, scheduler_hint, block_migration,
disk_over_commit, request_spec)
else:
self.conductor_compute_rpcapi.migrate_server(
context, instance, scheduler_hint, True, False, None,
block_migration, disk_over_commit, None,
request_spec=request_spec)
def build_instances(self, context, instances, image, filter_properties,
admin_password, injected_files, requested_networks,
security_groups, block_device_mapping, legacy_bdm=True,
request_spec=None, host_lists=None):
self.conductor_compute_rpcapi.build_instances(context,
instances=instances, image=image,
filter_properties=filter_properties,
admin_password=admin_password, injected_files=injected_files,
requested_networks=requested_networks,
security_groups=security_groups,
block_device_mapping=block_device_mapping,
legacy_bdm=legacy_bdm, request_spec=request_spec,
host_lists=host_lists)
def schedule_and_build_instances(self, context, build_requests,
request_spec, image,
admin_password, injected_files,
requested_networks, block_device_mapping,
tags=None):
self.conductor_compute_rpcapi.schedule_and_build_instances(
context, build_requests, request_spec, image,
admin_password, injected_files, requested_networks,
block_device_mapping, tags)
def unshelve_instance(self, context, instance, request_spec=None):
self.conductor_compute_rpcapi.unshelve_instance(context,
instance=instance, request_spec=request_spec)
def rebuild_instance(self, context, instance, orig_image_ref, image_ref,
injected_files, new_pass, orig_sys_metadata,
bdms, recreate=False, on_shared_storage=False,
preserve_ephemeral=False, host=None,
request_spec=None, reimage_boot_volume=False):
self.conductor_compute_rpcapi.rebuild_instance(context,
instance=instance,
new_pass=new_pass,
injected_files=injected_files,
image_ref=image_ref,
orig_image_ref=orig_image_ref,
orig_sys_metadata=orig_sys_metadata,
bdms=bdms,
recreate=recreate,
on_shared_storage=on_shared_storage,
preserve_ephemeral=preserve_ephemeral,
host=host,
request_spec=request_spec,
reimage_boot_volume=reimage_boot_volume)
def cache_images(self, context, aggregate, image_ids):
"""Request images be pre-cached on hosts within an aggregate.
:param context: The RequestContext
:param aggregate: The objects.Aggregate representing the hosts to
contact
:param image_ids: A list of image ID strings to send to the hosts
"""
for image_id in image_ids:
# Validate that we can get the image by id before we go
# ask a bunch of hosts to do the same. We let this bubble
# up to the API, which catches NovaException for the 4xx and
# otherwise 500s if this fails in some unexpected way.
self.image_api.get(context, image_id)
self.conductor_compute_rpcapi.cache_images(context, aggregate,
image_ids)
def confirm_snapshot_based_resize(
self, ctxt, instance, migration, do_cast=True):
self.conductor_compute_rpcapi.confirm_snapshot_based_resize(
ctxt, instance, migration, do_cast=do_cast)
def revert_snapshot_based_resize(
self, ctxt, instance, migration):
self.conductor_compute_rpcapi.revert_snapshot_based_resize(
ctxt, instance, migration)
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