On Mon, 14 Jul 2014 06:09:32 +0000, Steven D'Aprano wrote:
> I want to catch all uncaught exceptions in my application, log them,
> then handle as normal. Which, in practice, means a traceback. Is this
> the right way to do it?
I think I've answered my own question, which leads to the next question.
I'm logging with the syslog handler, and I can see all the logged
messages *except* those generated by my logger's exception method.
Here's my code, consisting of two modules:
# === mylogging.py ===
import logging
import logging.handlers
name = 'Spam'
mylogger = logging.getLogger(name)
handler = logging.handlers.SysLogHandler(address='/dev/log')
mylogger.addHandler(handler)
mylogger.setLevel(logging.DEBUG)
mylogger.info('started logging ' + name)
# === main.py ===
from mylogging import mylogger
mylogger.info('main.py running')
mylogger.debug('I can see debugging messages too')
import sys
def my_error_handler(type, value, tb):
msg = "Uncaught %s: %s" % (type, value)
mylogger.exception(msg)
sys.__excepthook__(type, value, tb)
# Install exception handler.
sys.excepthook = my_error_handler
mylogger.info('testing exception logging...')
raise RuntimeError('a fake error occurred')
I run it from the command line on a Debian squeeze system:
steve@runes:~/test_logging$ python2.6 main.py
Traceback (most recent call last):
File "main.py", line 15, in <module>
raise RuntimeError('a fake error occurred')
RuntimeError: a fake error occurred
The debug and info messages are logged:
root@runes:/var/log# tail -1 debug
Jul 14 19:04:39 runes I can see debugging messages too
root@runes:/var/log# tail -3 messages
Jul 14 19:04:39 runes started logging Spam
Jul 14 19:04:39 runes main.py running
Jul 14 19:04:39 runes testing exception logging...
but the exception info which should have been generated by
mylogger.exception doesn't appear anywhere I can see.
What am I doing wrong?
--
Steven
--
https://mail.python.org/mailman/listinfo/python-list
