/usr/lib/python3/dist-packages/pymeasure/log.py is in python3-pymeasure 0.5-1.
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# This file is part of the PyMeasure package.
#
# Copyright (c) 2013-2017 PyMeasure Developers
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
import logging
import logging.handlers
from logging.handlers import QueueHandler
from queue import Queue
log = logging.getLogger(__name__)
log.addHandler(logging.NullHandler())
class QueueListener(logging.handlers.QueueListener):
def is_alive(self):
try:
return self._thread.is_alive()
except AttributeError:
return False
def console_log(logger, level=logging.INFO, queue=None):
"""Create a console log handler. Return a scribe thread object."""
if queue is None:
queue = Queue()
logger.setLevel(level)
ch = logging.StreamHandler()
ch.setLevel(level)
formatter = logging.Formatter(
fmt='%(asctime)s: %(message)s (%(name)s, %(levelname)s)',
datefmt='%I:%M:%S %p')
ch.setFormatter(formatter)
logger.addHandler(ch)
scribe = Scribe(queue)
return scribe
def file_log(logger, log_filename, level=logging.INFO, queue=None, **kwargs):
"""Create a file log handler. Return a scribe thread object."""
if queue is None:
queue = Queue()
logger.setLevel(level)
ch = logging.FileHandler(log_filename, **kwargs)
ch.setLevel(level)
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
ch.setFormatter(formatter)
logger.addHandler(ch)
scribe = Scribe(queue)
return scribe
class Scribe(QueueListener):
""" Scribe class which logs records as retrieved from a queue to support consistent
multi-process logging.
:param queue: The multiprocessing queue which the scriber will listen to.
"""
def __init__(self, queue):
super().__init__(queue)
def handle(self, record):
logging.getLogger(record.name).handle(record)
def setup_logging(logger=None, console=False, console_level='INFO', filename=None,
file_level='DEBUG', queue=None, file_kwargs=None):
"""Setup logging for console and/or file logging. Returns a scribe thread object.
Defaults to no logging."""
if queue is None:
queue = Queue()
if logger is None:
logger = logging.getLogger()
if file_kwargs is None:
file_kwargs = {}
logger.handlers = []
if console:
console_log(logger, level=getattr(logging, console_level))
logger.info('Set up console logging')
if filename is not filename:
file_log(logger, filename, level=getattr(logging, file_level), **file_kwargs)
logger.info('Set up file logging')
scribe = Scribe(queue)
return scribe
class TopicQueueHandler(QueueHandler):
def __init__(self, queue, topic='log'):
super().__init__(queue)
self.topic = topic
def prepare(self, record):
return self.topic, record
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