我正在使用pythons日志库开发数据分析管道。我正在记录有关正在运行的步骤以及调用程序的原始输出的自定义消息。我使用//get the collection
IMongoCollection<WorkerSession> workerSessions = Select<WorkerSession>();
if (query.IsOngoing.HasValue)
{
IFindFluent<WorkerSession, WorkerSession> items = query.IsOngoing.Value
? workerSessions.Find(session => session.CompletedOn == null)
: workerSessions.Find(session => session.CompletedOn != null);
}
来简化shell命令的调用。它允许我定义一个回调函数来处理sh.py的每一行。
我希望能够定义我的回调函数，将每行记录到日志文件中而不用格式化（这些程序输出很多行）：
STDOUT/STDERR我生成的日志文件如下所示：
log.info("Starting %s run on %s", program_name, file_name)
def call_back(line):
log.info.NOFORMAT(line) # do the no format logging
sh.program(args, _out=call_back)
log.info("Finished running %s", program_name)
有谁知道我怎么能做到这一点？
答案 0 :(得分：2)
您可以为logging.Formatter将使用的处理程序设置Logger对象。它应该实现format(record)方法，该方法将返回实际显示的字符串。
import sh
import logging
class MyFormatter(logging.Formatter):
def __init__(self, *args, **kwargs):
logging.Formatter.__init__(self, *args, **kwargs)
self._enableFormatFlag = True
def enableFormat(self):
self._enableFormatFlag = True
def disableFormat(self):
self._enableFormatFlag = False
def format(self, record):
if self._enableFormatFlag:
return logging.Formatter.format(self, record)
else:
return record.getMessage()
logger = logging.getLogger('myapp')
logger.setLevel(logging.INFO)
handler = logging.StreamHandler()
logger.addHandler(handler)
formatter = MyFormatter(fmt="prefix[%(message)s]suffix")
handler.setFormatter(formatter)
def callback(line):
logger.info(line.strip())
logger.info("Will start program")
formatter.disableFormat()
sh.ls(['-l'],_out=callback)
formatter.enableFormat()
logger.info("Finished program")
PS：我之前的回答是关于收到回电，对不起。
答案 1 :(得分：1)
您可以查看logging.config https://docs.python.org/2/library/logging.config.html
基本上，您将定义一个专用记录器，该记录器与根记录器一起写入同一文件，但使用精简格式化程序，如format=%(message)s。在call_back中，您将明确地获取该记录器：logging.getlogger(logger_name)。
答案 2 :(得分：1)
您可以通过扩展logging.Formatter类来实现。如果日志消息附带可选的元数据simple=True-，则不会为该特定消息呈现格式。
class ConditionalFormatter(logging.Formatter):
def format(self, record):
if hasattr(record, 'simple') and record.simple:
return record.getMessage()
else:
return logging.Formatter.format(self, record)
rotating_file_formatter = ConditionalFormatter('%(asctime)s %(levelname)s - %(message)s')
rotating_file.setFormatter(rotating_file_formatter)
# ...
具有格式
logging.info("starting application ...")
日志输出：
2020-05-01 19:38:05,337 INFO - starting application ...
无格式
logging.info("starting application ...", extra={'simple': True})
日志输出：
starting application ...
在此脚本中，我使用控制台日志记录和文件日志记录。在常规日志中，我正在调用命令ls -ahl /，并将其所有输出直接传递到日志中而不进行格式化：
#!/usr/bin/env python3
import logging
import subprocess
import sys
from logging.handlers import RotatingFileHandler
def initialize_logger(log_file_path):
rotating_file = RotatingFileHandler(log_file_path, mode='a', maxBytes=5 * 1024 * 1024, backupCount=5, encoding=None, delay=0)
class ConditionalFormatter(logging.Formatter):
def format(self, record):
if hasattr(record, 'simple') and record.simple:
return record.getMessage()
else:
return logging.Formatter.format(self, record)
rotating_file_formatter = ConditionalFormatter('%(asctime)s %(levelname)s - %(message)s')
rotating_file.setFormatter(rotating_file_formatter)
rotating_file.setLevel(logging.DEBUG)
console_logger = logging.StreamHandler(sys.stdout)
console_logger_formatter = logging.Formatter('%(message)s')
console_logger.setFormatter(console_logger_formatter)
console_logger.setLevel(logging.INFO)
root_logger = logging.getLogger()
root_logger.setLevel(logging.DEBUG)
root_logger.addHandler(rotating_file)
root_logger.addHandler(console_logger)
def main():
initialize_logger('/var/log/my-app.log')
logging.info('starting application ...')
command = ["ls", "-ahl"]
working_directory = '/'
logging.info(f'running {command} ...')
process = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, cwd=working_directory)
with process.stdout:
for line in iter(process.stdout.readline, b''):
line = line.decode('utf-8')
line = line.strip()
logging.debug(line, extra={'simple': True})
exit_code = process.wait()
if exit_code == 0:
logging.debug(f'command "{command}" finished successfully')
else:
logging.debug(f'command "{command}" failed with exit code {exit_code}')
logging.info('stopping application')
if __name__ == '__main__':
main()
标准输出：
starting application ...
running ['ls', '-ahl'] ...
stopping application
输出文件/var/log/my-app.log：
2020-05-01 19:48:06,347 INFO - starting application ...
2020-05-01 19:48:06,347 INFO - running ['ls', '-ahl', '/'] ...
total 112K
drwxr-xr-x 25 root root 4.0K Apr 30 06:55 .
drwxr-xr-x 25 root root 4.0K Apr 30 06:55 ..
drwxr-xr-x 2 root root 4.0K Mar 31 06:39 bin
drwxr-xr-x 3 root root 4.0K May 1 06:02 boot
drwxrwxr-x 2 root root 4.0K Oct 11 2018 cdrom
drwxr-xr-x 20 root root 4.2K Apr 30 06:54 dev
drwxr-xr-x 154 root root 12K Apr 30 06:54 etc
drwxr-xr-x 3 root root 4.0K Oct 11 2018 home
lrwxrwxrwx 1 root root 33 Apr 30 06:55 initrd.img -> boot/initrd.img-4.15.0-99-generic
lrwxrwxrwx 1 root root 33 Apr 30 06:55 initrd.img.old -> boot/initrd.img-4.15.0-96-generic
drwxr-xr-x 21 root root 4.0K Oct 20 2018 lib
drwxr-xr-x 2 root root 4.0K Oct 20 2018 lib32
drwxr-xr-x 2 root root 4.0K Jul 25 2018 lib64
drwx------ 2 root root 16K Oct 11 2018 lost+found
drwxr-xr-x 4 root root 4.0K Oct 15 2018 media
drwxr-xr-x 3 root root 4.0K Jun 20 2019 mnt
drwxrwxrwx 23 root root 4.0K May 1 16:56 opt
dr-xr-xr-x 302 root root 0 Apr 23 19:57 proc
drwx------ 6 root root 4.0K Apr 29 22:31 root
drwxr-xr-x 40 root root 1.4K May 1 14:44 run
drwxr-xr-x 2 root root 12K Feb 9 12:00 sbin
drwxr-xr-x 15 root root 4.0K Apr 25 11:15 snap
drwxr-xr-x 2 root root 4.0K Jul 25 2018 srv
dr-xr-xr-x 13 root root 0 May 1 18:53 sys
drwxrwxrwt 32 root root 4.0K May 1 19:39 tmp
drwxr-xr-x 11 root root 4.0K Oct 20 2018 usr
drwxr-xr-x 15 root root 4.0K Jun 20 2019 var
lrwxrwxrwx 1 root root 30 Apr 30 06:55 vmlinuz -> boot/vmlinuz-4.15.0-99-generic
lrwxrwxrwx 1 root root 30 Apr 30 06:55 vmlinuz.old -> boot/vmlinuz-4.15.0-96-generic
2020-05-01 19:48:06,357 DEBUG - command "['ls', '-ahl', '/']" finished successfully
2020-05-01 19:48:06,357 INFO - stopping application