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https://github.com/joeribekker/django-logdb

Django-logdb enables you to log entries to a database, aggregate and act on them with certain rules, and gives you more insight in what's going on.
https://github.com/joeribekker/django-logdb

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Django-logdb enables you to log entries to a database, aggregate and act on them with certain rules, and gives you more insight in what's going on.

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DJANGO-LOGDB
============

Django-logdb enables you to log entries to a database, aggregate and act on
them with certain rules, and gives you more insight in what's going on.

Django-logdb requires Django 1.1 and higher.

Description
-----------

Django-logdb has a custom logging handler that writes log entries to the
database. It therefore integrates nicely with your existing logging
configuration and you can decide what log entries are written to the database.

The Django admin site is extended with a graphical view of recent log entries
to provide more insight in what is going on. The log messages are grouped by
log level or "type of log entry".

To minimize database access, aggregation is done via a Django command that you
can call periodically (as a cronjob).

Install
-------

The easiest way to install the package is via setuptools::

easy_install django-logdb

Once installed, update your Django `settings.py` and add ``djangologdb`` to your
INSTALLED_APPS::

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

In your Django `urls.py`, include the `djangologdb.urls` before the admin::

urlpatterns = patterns('',
...
(r'^admin/djangologdb/', include('djangologdb.urls')),
...
(r'^admin/', include(admin.site.urls)),
)

Optionally, if you want to log exceptions, add the middleware::

MIDDLEWARE_CLASSES = (
'django.middleware.common.CommonMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
...
'djangologdb.middleware.LoggingMiddleware',
)

Run ``python manage.py syncdb`` to create the database tables.

Setup logging
-------------

Now, for the actual logging part, you should use the database logging handler.
There are two ways to do this: Using only Python code, or, by using a
configuration file. Both methods are explained below.

To add this handler via Python to, for example, your root logger, you can add
the following to your Django `settings.py`::

import logging
from djangologdb.handler import DjangoDatabaseHandler, add_handler

logging.basicConfig(level=logging.DEBUG)
logger = logging.getLogger()

# A bug in Django causes the settings to load twice. Using
# this handler instead of logging.addHandler works around that.
add_handler(logger, DjangoDatabaseHandler())

To use this handler via a logging configuration file, simply import the
``handlers`` module from ``djangologdb`` in your Django `settings.py` before
loading the configuration from a file::

from djangologdb import handlers
logging.config.fileConfig(...)

Then in your logging configuration file, you can add it from the handlers
namespace and add it to any logger you want::

[handlers]
keys=djangologdb

[logger_root]
level=NOTSET
handlers=djangologdb

[handler_djangologdb]
class=handlers.DjangoDatabaseHandler
args=()

Configuration
-------------

You can set the following settings in your Django `settings.py` file:

LOGDB_HISTORY_DAYS
The number of days to show in the various graphs.

Default::

LOGDB_HISTORY_DAYS = 30

LOGDB_INTERVAL
The ``timedelta`` between each datapoint in the various graphs.

Default::

LOGDB_INTERVAL = datetime.timedelta(1) # 1 day

LOGDB_RULES
Define rules to create a new log entry when certain conditions are true.

Default::

LOGDB_RULES =
[{
# If 3 logs with level WARNING or higher occur in 5 minutes or
# less, create a new log with level CRITICAL.
'conditions': {
'min_level': logging.WARNING,
'qualname': '',
'min_times_seen': 3,
'within_time': datetime.timedelta(0, 5 * 60),
},
'actions': {
'level': logging.CRITICAL,
}
}]

LOGDB_LEVEL_COLORS
Set colors to use in the graph for level based datasets.

Default::

LOGDB_LEVEL_COLORS =
{
logging.DEBUG: '#c2c7d1',
logging.INFO: '#aad2e9',
logging.WARNING: '#b9a6d7',
logging.ERROR: '#deb7c1',
logging.CRITICAL: '#e9a8ab',
}

LOGDB_MEDIA_ROOT
Set the absolute path to the directory of `django-logdb` media.

Default::

LOGDB_MEDIA_ROOT = os.path.join(djangologdb.__path__[0], 'media')

LOGDB_MEDIA_URL
Set the URL that handles the media served from ``LOGDB_MEDIA_ROOT``. Make
sure to add a trailing slash at the end. If ``settings.DEBUG=True``, the
media will be served by Django.

Default::

LOGDB_MEDIA_URL = '/admin/djangologdb/media/'

Commands
--------

aggregate_logs
Aggregates log entries and triggers any action with matching rules.

*Usage*:
``python django-admin.py aggregate_logs``

*Options*:
-s, --skip-actions Do not use the rules to create new logs.
--cleanup=CLEANUP Specifies the number of days to keep log entries
and deletes the rest.

FAQ
---

The graph doesn't show in the Django admin.
If you don't have ``settings.DEBUG=True``, the media will not be served by
Django. You should copy the media directory to your own media directory and
set LOGDB_MEDIA_ROOT and LOGDB_MEDIA_URL accordingly.

Example::

LOGDB_MEDIA_ROOT = '/myproject/media/djanglogdb/'
LOGDB_MEDIA_URL = '/media/djanglogdb/'

Instead of copying, you can also use Apache's Alias directive to serve the
static files, as you probably also did for Django's own media files. It is
explained here: http://docs.djangoproject.com/en/dev/howto/deployment/modwsgi/#serving-media-files
This boils down to adding the following line to your VirtualHost entry::

Alias

Example::

Alias /admin/djangologdb/media/ /myproject/eggs/django_logdb-0.9.5-py2.6.egg/djangologdb/media/

The Django admin pages for django-logdb load very slow.
If you have a lot of datapoints in the graph, it executes a lot of queries.
This can take some time. You should decrease the time period or increase the
interval. By default, the last 30 days with an interval of 1 day is used,
resulting in 30 datapoints.
See the settings ``LOGDB_HISTORY_DAYS`` and ``LOGDB_INTERVAL``.

Why is there 1 query executed for each datapoint?
Django does not (yet) allow to group by certain date information. Even
though a timestamp is stored in the database, there is no way to tell the
Django ORM to group by day, by hour, etc. The solution I used was to
filter/limit the results needed to construct 1 datapoint.

When I run my tests, I see ``ERROR:djangologdb.middleware`` [...]
When you run, for example, the testproject, the configuration is set so
that any error is also displayed on ``sys.stderr``. As you you'll see, the
tests all succeed but the exceptions that are tested are just displayed in
the console. This is not an error!

You can disable this behaviour by disabling logging to the console for your
test configuration (ie. remove the handler).

Why are the templates extending a local version of the Django base templates?
This is done for optimal flexibility regarding custom templates. Skins like
Grappelli override a lot of templates and sometimes you want to be able to
change and use the base template in django-logdb and change some specifics
in the django-logdb template itself without copying all the base template
stuff.

Test project
------------

The testproject is a sample installation of django-logdb. It provides a
settings file for Django 1.1 and Django 1.2, just to run it.

In the directory below the testproject, create a virtual environment::

$ virtualenv .
$ source bin/activate

Install Django and run the internal server using one of the setting files for
your Django version.

$ bin/python bin/pip install django
$ bin/python bin/django-admin.py runserver --settings=testproject.settings_django_1_1

Thanks
------
To the various people that helped making this project better and better:

- Maciek Szczesniak (vvarp)
- Victor van den Elzen

Thanks to David Cramer for his work on django-db-log
(http://github.com/dcramer/django-db-log/) on which this package was based.