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nodepool/nodepool/provider_manager.py

76 lines
2.7 KiB

# Copyright (C) 2011-2013 OpenStack Foundation
#
# 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.
import logging
from nodepool.driver import Drivers
def get_provider(provider):
driver = Drivers.get(provider.driver.name)
return driver.getProvider(provider)
class ProviderManager(object):
log = logging.getLogger("nodepool.ProviderManager")
@staticmethod
def reconfigure(old_config, new_config, zk_conn,
only_image_manager=False):
'''
Reconfigure the provider managers on any configuration changes.
If a provider configuration changes, stop the current provider
manager we have cached and replace it with a new one.
:param Config old_config: The previously read configuration.
:param Config new_config: The newly read configuration.
:param ZooKeeper zk_conn: A ZooKeeper connection object.
:param bool only_image_manager: If True, skip manager that do not
manage images. This is used by the builder process.
'''
stop_managers = []
for p in new_config.providers.values():
if only_image_manager and not p.manage_images:
continue
oldmanager = None
if old_config:
oldmanager = old_config.provider_managers.get(p.name)
if oldmanager and p != oldmanager.provider:
stop_managers.append(oldmanager)
oldmanager = None
if oldmanager:
new_config.provider_managers[p.name] = oldmanager
else:
ProviderManager.log.debug("Creating new ProviderManager object"
" for %s" % p.name)
try:
pm = get_provider(p)
pm.start(zk_conn)
new_config.provider_managers[p.name] = pm
except Exception:
ProviderManager.log.exception(
"Error starting provider %s", p.name)
for stop_manager in stop_managers:
stop_manager.stop()
@staticmethod
def stopProviders(config):
for m in config.provider_managers.values():
m.stop()
m.join()