# -*- 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
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# 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.
from __future__ import print_function
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)
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