c8f3903fa4
In order to understand how listeners are used it is pretty nice to have a default set that do basic printing and logging that can be used in debugging (or just as examples). Include an example that uses this as well. Fixes: bug 1224060 Change-Id: I7ba6e9dcbdca84d014b9d1f5054ce7a37eb766f2
44 lines
1.5 KiB
Python
44 lines
1.5 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 print_function
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import sys
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import traceback
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from taskflow.listeners import base
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from taskflow.utils import misc
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class PrintingListener(base.LoggingBase):
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"""Writes the task and flow notifications messages to stdout or stderr"""
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def __init__(self, engine,
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listen_for=misc.TransitionNotifier.ANY, stderr=False):
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super(PrintingListener, self).__init__(engine, listen_for)
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if stderr:
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self._file = sys.stderr
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else:
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self._file = sys.stdout
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def _log(self, message, *args, **kwargs):
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print(message % args, file=self._file)
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exc_info = kwargs.get('exc_info')
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if exc_info is not None:
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traceback.print_exception(exc_info[0], exc_info[1], exc_info[2],
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file=self._file)
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