Wednesday, 16. September 2009, 16:06:11
If you need to create log files from within a Django application, there are many options. One of them is to use the Python logging module to create a separate file for views.py and other files involved. Of course, two files can also share the same log file using this technique. The configuration below will also enable log rotation which happens every day at midnight (as soon as a new entry is written).
First, create the file
logconfig.py inside your application and add the following content
import logging
import logging.handlers
from django.conf import settings
logs = ('views','some_other_module')
def init():
for log in logs:
filename = settings.LOGGING_DIRECTORY + log
logger = logging.getLogger(log)
logger.setLevel(logging.DEBUG) # log ~everything
handler = logging.handlers.TimedRotatingFileHandler(filename, when = 'midnight', backupCount=9)
formatter = logging.Formatter("%(asctime)s %(levelname)-8s %(message)s")
handler.setFormatter(formatter)
if needRollover(filename):
# triggers a rollover when the server is started
handler.doRollover()
logger.addHandler(handler)
logger.debug("logging for %s initialized", log)
def needRollover(filename):
today = date.today()
return not exists("%s.%s" % (filename, str(today)))
initialized = False
if not initialized:
init()
initialized = True
The above initializes the loggers and relies to having settings.py define the variable
LOGGING_DIRECTORY. Note that the web server needs write access to this directory in order to write the logs. Now, for all the source files you want to have logging, it is necessary to import the logging module and the above one to configure the loggers. Then you need to fetch an instance of a logger that you can use throughout the file (the argument to getLogger can be any string defined in the logs variable in the above file).
# other imports...
import logconfig, logging
log = logging.getLogger('views')
The last step is to actually do some logging
def anyView(request):
# do stuff
log.debug("this is a debug message")
# do some more stuff
log.error("an error occurred")
You can use the default log levels debug, info, warning, error and critical. In case you want only the warnings or more severe conditions to be logged, the sole thing you need to change is the log level in logconfig.py. Have a lot of fun
. The main downside of this approach is that you cannot use gsynaptics to configure all of the cool features a synaptics touchpad offers (like two finger scrolling etc).
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