96 lines
3.6 KiB
Python
96 lines
3.6 KiB
Python
# -*- coding: utf-8 -*-
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright (C) 2013 Yahoo! Inc. All Rights Reserved.
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#
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# 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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from __future__ import absolute_import
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import abc
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import logging
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import six
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from taskflow import states
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from taskflow.utils import misc
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LOG = logging.getLogger(__name__)
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# NOTE(harlowja): on these states will results be useable, all other states
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# do not produce results.
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FINISH_STATES = (states.FAILURE, states.SUCCESS)
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class LoggingBase(six.with_metaclass(abc.ABCMeta)):
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"""This provides a simple listener that can be attached to an engine which
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can be derived from to log the received actions to some logging backend. It
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provides a useful context manager access to be able to register and
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unregister with a given engine automatically when a context is entered and
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when it is exited.
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"""
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def __init__(self, engine,
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listen_for=misc.TransitionNotifier.ANY):
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self._listen_for = listen_for
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self._engine = engine
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self._registered = False
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@abc.abstractmethod
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def _log(self, message, *args, **kwargs):
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raise NotImplementedError()
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def _flow_receiver(self, state, details):
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self._log("%s has moved flow '%s' (%s) into state '%s'",
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details['engine'], details['flow_name'],
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details['flow_uuid'], state)
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def _task_receiver(self, state, details):
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if state in FINISH_STATES:
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result = details.get('result')
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exc_info = None
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was_failure = False
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if isinstance(result, misc.Failure):
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if result.exc_info:
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exc_info = tuple(result.exc_info)
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was_failure = True
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self._log("%s has moved task '%s' (%s) into state '%s'"
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" with result '%s' (failure=%s)",
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details['engine'], details['task_name'],
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details['task_uuid'], state, result, was_failure,
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exc_info=exc_info)
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else:
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self._log("%s has moved task '%s' (%s) into state '%s'",
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details['engine'], details['task_name'],
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details['task_uuid'], state)
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def __enter__(self):
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if not self._registered:
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self._engine.notifier.register(self._listen_for,
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self._flow_receiver)
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self._engine.task_notifier.register(self._listen_for,
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self._task_receiver)
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self._registered = True
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def __exit__(self, type, value, tb):
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try:
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self._engine.notifier.deregister(self._listen_for,
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self._flow_receiver)
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self._engine.task_notifier.deregister(self._listen_for,
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self._task_receiver)
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self._registered = False
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except Exception:
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# Don't let deregistering throw exceptions
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LOG.exception("Failed deregistering listeners from engine %s",
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self._engine)
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