django-settings-env 4.2.0

12-factor.net settings support for Django based on envex

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django-settings-env

12-factor.net settings environment handler for Django

envex

The functionality outlined in this section is derived from the dependent package envex, the docs for which are partially repeated below.

Skip to the Django Support section for functionality added by this extension.

envex provides a convenient type-smart interface for handling the environment, and therefore configuration of any application using 12factor.net principals removing many environment specific variables and security sensitive information from application code.

This module provides some features not supported by other dotenv handlers (python-dotenv, etc.) including expansion of template variables which is very useful for DRY.

More detailed info can be found in the envex README.

Django Support

By default, the Env class provided by this module can apply a given prefix (default "DJANGO_") to environment variables names, but will only be used in that form if the raw (unprefixed) variable name is not set in the environment. To change the prefix including setting it to an empty string, pass the prefix= kwarg to Env.__init__.

Some django specific methods included in this module are URL parsers for:

Default Var	Parser
DATABASE_URL	env.database_url()
CACHE_URL	env.cache_url()
EMAIL_URL	env.email_url()
SEARCH_URL	env.search_url()
QUEUE_URL	env.queue_url()

each of which can be injected into django settings via the environment, typically from a .env file at the project root.

The name of the file and paths searched is fully customisable.

The url specified includes a schema that determines the "backend" class or module that handles the corresponding functionality as documented below.

database_url

Evaluates a URL in the form

schema://[username:[password]@]host_or_path[:port]/name

Schemas:

Scheme	Database
postgres	Postgres (psycopg2)
postgresql	Postgres (psycopg2)
psql	Postgres (psycopg2)
pgsql	Postgres (psycopg2)
postgis	Postgres (psycopg2) using PostGIS extensions
mysql	MySql (mysqlclient)
mysql2	MySql (mysqlclient)
mysql-connector	MySql (mysql-connector)
mysqlgis	MySql (mysqlclient) using GIS extensions
mssql	SqlServer (sql_server.pyodbc)
oracle	Oracle (cx_Oracle)
pyodbc	ODBC (pyodbc)
redshift	Amazon Redshift
spatialite	Sqlite with spatial extensions (spatialite)
sqlite	Sqlite
ldap	django-ldap

cache_url

Evaluates a URL in the form

schema://[username:[password]@]host_or_path[:port]/[name]

Schemas:

Scheme	Cache
dbcache	cache in database
dummycache	dummy cache - "no cache"
filecache	cache data in files
locmemcache	cache in memory
memcache	memcached (python-memcached)
pymemcache	memcached (pymemcache)
rediscache	redis (django-redis)
redis	redis (django-redis)

email_url

Evaluates a URL in the form

schema://[username[@domain]:[password]@]host_or_path[:port]/

Schemas:

Scheme	Service
smtp	smtp, no SSL
smtps	smtp over SSL
smtp+tls	smtp over SSL
smtp+ssl	smtp over SSL
consolemail	publish mail to console (dev)
filemail	append email to file (dev)
memorymail	store emails in memory
dummymail	do-nothing email backend
amazonses	Amazon Wimple Email Service
amazon-ses	Amazon Wimple Email Service

search_url

Evaluates a URL in the form

schema://[username:[password]@]host_or_path[:port]/[index]

Schemas:

Scheme	Engine
elasticsearch	elasticsearch (django-haystack)
elasticsearch2	elasticsearch2 (django-haystack)
solr	Apache solr (django-haystack)
whoosh	Whoosh search engine (pure python, haystack)
xapian	Xapian search engine (haystack)
simple	Simple search engine (haystack)

queue_url

Evaluates a URL in the form

schema://[username:[password]@]host_or_path[:port]/[queue]

Schemas:

Scheme	Engine
rabbitmq	RabbitMQ
redis	Redis
amazonsqs	Amazon SQS
amazon-sqs	alias for Amazon SQS

Django Class Settings

Support for the django-class-settings module is added to the env handler, allowing a much simplified use withing a class_settings.Settings class, e.g.:

from django_settings_env import Env
from class_settings import Settings

env = Env(prefix='DJANGO_')

class MySettings(Settings):
    MYSETTING = env()

This usage will look for 'MYSETTING' or 'DJANGO_MYSETTNG' in the environment and lazily assign it to the MYSETTING value for the settings class.

:warning: The functional form of env() is now available even if django class settings is not used or installed.