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README.rst

django-db-log

Logs Django exceptions to your database handler.

Upgrading

If you use South migrations, simply run:

python manage.py migrate djangodblog

If you don't use South, then start.

Notable Changes

  • 2.1.0 There is no longer a middleware. Instead, we use a fallback exception handler which catches all.
  • 2.0.0 Added checksum column to Error. Several indexes were created. Checksum calculation slightly changed.
  • 1.4.0 Added logger column to both Error and ErrorBatch. traceback and class_name are now nullable.
  • 1.3.0 Added level column to both Error and ErrorBatch.

Install

The easiest way to install the package is via pip:

pip install django-db-log --upgrade

OR, if you're not quite on the same page (work on that), with setuptools:

easy_install django-db-log

Once installed, update your settings.py and add dblog to INSTALLED_APPS:

INSTALLED_APPS = (
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'djangodblog',
    ...
)

Finally, run python manage.py syncdb to create the database tables.

Configuration

Several options exist to configure django-db-log via your settings.py:

DBLOG_CATCH_404_ERRORS

Enable catching of 404 errors in the logs. Default value is False:

DBLOG_CATCH_404_ERRORS = True

You can skip other custom exception types by adding a skip_dblog = True attribute to them.

DBLOG_DATABASE_USING

Use a secondary database to store error logs. This is useful if you have several websites and want to aggregate error logs onto one database server:

# This should correspond to a key in your DATABASES setting
DBLOG_DATABASE_USING = 'default'

You should also enable the DBLogRouter to avoid things like extraneous table creation:

DATABASE_ROUTERS = [
        'djangodblog.routers.DBLogRouter',
        ...
]

Some things to note:

  • This functionality REQUIRES Django 1.2.

DBLOG_ENHANCED_TRACEBACKS

Enables showing full embedded (enhanced) tracebacks within the administration for "Messages". These work almost identically to the default exception pages within Django's DEBUG environment:

# Disable embedded interactive tracebacks in the admin
DBLOG_ENHANCED_TRACEBACKS = False
  • Note: Even if you disable displaying of enhanced tracebacks, dblog will still store the entire exception stacktrace.

DBLOG_LOGGING

Enabling this setting will turn off automatic database logging within the exception handler, and instead send all exceptions to the named logger dblog. Use this in conjuction with djangodblog.handlers.DBLogHandler or your own handler to tweak how logging is dealt with.

A good example use case for this, is if you want to write to something like a syslog ahead of time, and later process that into the database with another tool.

Integration with logging

django-db-log supports the ability to directly tie into the logging module. To use it simply add DBLogHandler to your logger:

import logging
from djangodblog.handlers import DBLogHandler

logging.getLogger().addHandler(DBLogHandler())

# Add StreamHandler to dblog's default so you can catch missed exceptions
logging.getLogger('dblog').addHandler(logging.StreamHandler())

You can also use the exc_info and extra=dict(url=foo) arguments on your log methods. This will store the appropriate information and allow django-db-log to render it based on that information:

logging.error('There was some crazy error', exc_info=sys.exc_info(), extra={'url': request.build_absolute_uri()})

Usage

You will find two new admin panels in the automatically built Django administration:

  • Messages (Error)
  • Message summaries (ErrorBatch)

It will store every single error inside of the Errors model, and it will store a collective, or summary, of errors inside of Error batches (this is more useful for most cases). If you are using this on multiple sites with the same database, the Errors table also contains the SITE_ID for which it the error appeared on.

If you wish to access these within your own views and models, you may do so via the standard model API:

from djangodblog.models import Error, ErrorBatch

# Pull the last 10 unresolved errors.
ErrorBatch.objects.filter(status=0).order_by('-last_seen')[0:10]

You can also record errors outside of handler if you want:

from djangodblog.models import Error

try:
        ...
except Exception, exc:
        Error.objects.create_from_exception(exc, [url=None])

If you wish to log normal messages (useful for non-logging integration):

from djangodblog.models import Error
import logging

Error.objects.create_from_text('Error Message'[, level=logging.WARNING, url=None])

Both the url and level parameters are optional. level should be one of the following:

  • logging.DEBUG
  • logging.INFO
  • logging.WARNING
  • logging.ERROR
  • logging.FATAL

If you have a custom exception class, similar to Http404, or something else you don't want to log, you can also add skip_dblog = True to your exception class or instance, and dblog will simply ignore the error.

Notes

  • django-db-log will automatically integrate with django-idmapper.
  • django-db-log supports South migrations.
  • The fact that the admin shows large quantities of results, even if there aren't, is not a bug. This is an efficiency hack on top of Django.
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