Nikolaus Rath wrote:
> Hi,
>
> Are there any best practices for handling multi-line log messages?
>
> For example, the program,
>
> main = logging.getLogger()
> handler = logging.StreamHandler()
> handler.setFormatter(logging.Formatter('%(asctime)s %(levelname)s
> %(message)s'))
> main.addHandler(handler)
> main.setLevel(logging.DEBUG)
> main.info("Starting")
> try:
> bla = 42/0
> except:
> main.exception("Oops...")
>
> generates the log messages
>
> 2009-06-16 22:19:57,515 INFO Starting
> 2009-06-16 22:19:57,518 ERROR Oops...
> Traceback (most recent call last):
> File "/home/nikratio/lib/EclipseWorkspace/playground/src/mytests.py", line
> 27, in <module>
> bla = 42/0
> ZeroDivisionError: integer division or modulo by zero
>
>
> which are a mess in any logfile because they make it really difficult to
> parse.
>
>
> How do you usually handle multi-line messages? Do you avoid them
> completely (and therefore also the exception logging facilities provided
> by logging)? Or is it possible to tweak the formatter so that it inserts
> the prefix at the beginning of every line?
>
>
The next line that starts with a timestamp is part of the next log.
If you added timestamp on every line, that would be much more difficult
to parse. You could do something like:
import re
timestamp_re = '...'
messages = []
for line in open('log.log'):
if timestamp_re.match(line):
messages.append([line])
else:
messages[-1].append(line)
--
http://mail.python.org/mailman/listinfo/python-list
