60 lines
2.0 KiB
Python
60 lines
2.0 KiB
Python
# 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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import functools
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import logging
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import stevedore
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LOG = logging.getLogger(__name__)
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class _GetNodesHandlersFactory(object):
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def __init__(self, name):
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self.name = name
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def on_load_failure_callback(self, manager, endpoint, exc):
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LOG.error('Failed to load %s: %s', endpoint.name, exc)
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raise # Avoid unexpectedly skipped steps
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@property
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def extensions(self):
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extension_manager = stevedore.ExtensionManager(
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'octane.handlers.' + self.name,
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on_load_failure_callback=self.on_load_failure_callback,
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)
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extensions = dict(extension_manager.map(
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lambda ext: (ext.name, ext.plugin)))
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self.__dict__['extensions'] = extensions
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return extensions
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def __call__(self, nodes, *args, **kwargs):
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handlers = []
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for node in nodes:
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for role in node.data['roles']:
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try:
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cls = self.extensions[role]
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except KeyError:
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LOG.warn("Role '%s' is not supported, skipping", role)
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else:
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handlers.append(cls(node, *args, **kwargs))
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return functools.partial(self.call_method_on_all, handlers)
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@staticmethod
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def call_method_on_all(handlers, method):
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for handler in handlers:
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try:
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getattr(handler, method)()
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except NotImplementedError:
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LOG.info("Method '%s' not implemented in handler %s",
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method, type(handler).__name__)
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