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