74 lines
2.4 KiB
Python
Executable File
74 lines
2.4 KiB
Python
Executable File
#
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# Copyright (c) 2015-2016 Wind River Systems, Inc.
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#
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# SPDX-License-Identifier: Apache-2.0
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#
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import six
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import stevedore
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from nfv_common import debug
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from nfv_common.helpers import Singleton
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DLOG = debug.debug_get_logger('nfv_common.event_log.event_log_handlers')
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@six.add_metaclass(Singleton)
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class EventLogHandlers(stevedore.enabled.EnabledExtensionManager):
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"""
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Event Log Handlers
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"""
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_version = '1.0.0'
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_signature = 'e33d7cf6-f270-4256-893e-16266ee4dd2e'
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def __init__(self, namespace, handler_names):
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super(EventLogHandlers, self).__init__(namespace,
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EventLogHandlers.valid_handler,
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invoke_on_load=True,
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invoke_args=(), invoke_kwds={})
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handler_list = [handler.strip() for handler in handler_names.split(',')]
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self._handlers = {}
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for handler in self:
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if handler.obj.name in handler_list:
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handler_id = handler.obj.provider + ':' + handler.obj.name
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if handler_id not in self._handlers:
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self._handlers[handler_id] = handler
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DLOG.info("Loaded handler %s version %s provided by %s."
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% (handler.obj.name, handler.obj.version,
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handler.obj.provider))
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@staticmethod
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def valid_handler(handler):
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"""
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Verify signature of the handler is valid
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"""
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if EventLogHandlers._signature == handler.obj.signature:
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return True
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else:
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DLOG.info("Handler %s version %s from provider %s has an invalid "
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"signature." % (handler.obj.name, handler.obj.version,
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handler.obj.provider))
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return False
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def log(self, log_data):
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"""
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Log a particular event using the handlers
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"""
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for handler_type, handler in self._handlers.items():
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handler.obj.log(log_data)
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def initialize(self, config_file):
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"""
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Initialize handlers
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"""
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for handler_id, handler in self._handlers.items():
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handler.obj.initialize(config_file)
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def finalize(self):
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"""
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Finalize handlers
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"""
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for handler_id, handler in self._handlers.items():
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handler.obj.finalize()
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