A feature flipper for Django.
Project description
Django Waffle is (yet another) feature flipper for Django. You can define the conditions for which a flag should be active, and use it in a number of ways.
Installation
To start using Waffle, you just need to add it to your INSTALLED_APPS and MIDDLEWARE_CLASSES:
INSTALLED_APPS = (
# ...
'waffle',
# ...
)
MIDDLEWARE_CLASSES = (
# ...
'waffle.middleware.WaffleMiddleware',
# ...
)
Since Waffle will be setting cookies on response objects, you probably want it below any middleware that tweaks cookies before sending them out.
Creating a Flag
Creating and managing flags is done through the Django admin interface. Each feature flag is represented by a Flag object, which has several properties.
- Name:
The name of the flag. Will be used to identify the flag everywhere.
- Everyone:
You can flip this flag on (Yes) or off (No) for everyone, overriding all other settings. Leave as Unknown to use normally.
- Percent:
A percentage of users for whom the flag will be active. This is maintained through cookies, so clever users can get around it. Still, it’s the most common case.
- Superusers:
Is this flag always active for superusers?
- Staff:
Is this flag always active for staff?
- Authenticated:
Is this flag always active for authenticated users?
- Groups:
A list of group IDs for which this flag will always be active.
- Users:
A list of user IDs for which this flag will always be active.
You can combine multiple settings here. For example, you could offer a feature to 12% of users and all superusers. When combining settings, the flag will be active for the user if any of the settings matches for them.
Using a Flag
Flags can be used in templates, in views, or wrapped around entire views.
If you try to use a flag that is not defined, it will always be inactive.
Using a Flag in Templates
Jingo/Jinja2
To use a flag in a Jinja2 template via Jingo, you can simply do:
{% if waffle('flag_name') %}
Content if flag is active
{% endif %}
You can also add an {% else %} section, of course:
{% if waffle('flag_name') %}
Flag is active!
{% else %}
Flag is inactive!
{% endif %}
Django Templates
To use a flag in vanilla Django templates, you can use the waffle tag:
{% load waffle_tags %}
{% waffle flag_name %}
Content if flag is active
{% endwaffle %}
The {% waffle %} tag also supports an {% else %} section:
{% waffle flag_name %}
Flag is active!
{% else %}
Flag is inactive!
{% endwaffle %}
Using a Flag in Views
To use a flag in a view, you just need waffle.is_active:
import waffle
def my_view(request):
if waffle.is_active(request, 'flag_name'):
# Behavior if flag is active.
else:
# Behavior if flag is inactive.
Wraping a Whole View in a Flag
You can also wrap an entire view in a flag:
from waffle.decorators import waffle
@waffle('flag_name')
def my_view(request):
# View only available if flag is active.
If the flag is not active for the request, the view will be a 404.
You can reverse this by putting an exclamation point at the start of the flag name, for example:
@waffle('!flag_name')
def my_view(request):
# View is only available if flag is INactive.
Global Settings
There are a few global settings you can define to adjust Waffle’s behavior.
Setting |
Default |
Description |
|---|---|---|
WAFFLE_COOKIE |
'dwf_%s' |
The format for the cookies Waffle sets. Must contain '%s'. |
WAFFLE_DEFAULT |
False |
By default, if a flag is undefined, Waffle treats it as inactive for everyone. Set this to True to treat undefined flags as active. |
WAFFLE_MAX_AGE |
2,529,000 |
How long should Waffle cookies last? (Integer, in seconds.) See the Cookies section. |
WAFFLE_OVERRIDE |
False |
Whether flags can be forced to be active from the query string. |
WAFFLE_SECURE |
False |
Whether to set the secure flag on cookies. |
Overriding Flags
If you turn on the WAFFLE_OVERRIDE setting, you can guarantee a flag will be active for a request by putting it in the query string.
For example, if I use the flag example in a view that serves the URL /search, then I can turn on the flag by adding ?example=1 to the query string, or turn it off by adding ?example=0.
By default, WAFFLE_OVERRIDE is off. It may be useful for testing, automated testing in particular.
To Do
Keep a flag setting for a given user, regardless of browser/device.
Add a “dial-up” mode that slowly turns on the flag for all users.
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