Source code for taskflow.listeners.printing

# -*- coding: utf-8 -*-

#    Copyright (C) 2013 Yahoo! Inc. All Rights Reserved.
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.

import sys
import traceback

from taskflow.listeners import base

[docs]class PrintingListener(base.DumpingListener): """Writes the task and flow notifications messages to stdout or stderr.""" def __init__(self, engine, task_listen_for=base.DEFAULT_LISTEN_FOR, flow_listen_for=base.DEFAULT_LISTEN_FOR, retry_listen_for=base.DEFAULT_LISTEN_FOR, stderr=False): super(PrintingListener, self).__init__( engine, task_listen_for=task_listen_for, flow_listen_for=flow_listen_for, retry_listen_for=retry_listen_for) if stderr: self._file = sys.stderr else: self._file = sys.stdout def _dump(self, message, *args, **kwargs): print(message % args, file=self._file) exc_info = kwargs.get('exc_info') if exc_info is not None: traceback.print_exception(exc_info[0], exc_info[1], exc_info[2], file=self._file)