django-environ 0.4.5

Django-environ allows you to utilize 12factor inspired environment variables to configure your Django application.

Django-environ
==============

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**django-environ** allows you to use `Twelve-factor methodology`_ to configure your Django application with environment variables.

|cover|

.. _settings.py:

.. code-block:: python

import environ
env = environ.Env(
# set casting, default value
DEBUG=(bool, False)
)
# reading .env file
environ.Env.read_env()

# False if not in os.environ
DEBUG = env('DEBUG')

# Raises django's ImproperlyConfigured exception if SECRET_KEY not in os.environ
SECRET_KEY = env('SECRET_KEY')

# Parse database connection url strings like psql://user:pass@127.0.0.1:8458/db
DATABASES = {
# read os.environ['DATABASE_URL'] and raises ImproperlyConfigured exception if not found
'default': env.db(),
# read os.environ['SQLITE_URL']
'extra': env.db('SQLITE_URL', default='sqlite:////tmp/my-tmp-sqlite.db')
}

CACHES = {
# read os.environ['CACHE_URL'] and raises ImproperlyConfigured exception if not found
'default': env.cache(),
# read os.environ['REDIS_URL']
'redis': env.cache('REDIS_URL')
}

See the `similar code, sans django-environ <https://gist.github.com/joke2k/cc30ed2d5ccda52d5b551ccbc17e536b>`_.

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The idea of this package is to unify a lot of packages that make the same stuff:
Take a string from ``os.environ``, parse and cast it to some of useful python typed variables.
To do that and to use the `12factor`_ approach, some connection strings are expressed as url,
so this package can parse it and return a ``urllib.parse.ParseResult``.
These strings from ``os.environ`` are loaded from a `.env` file and filled in ``os.environ`` with ``setdefault`` method,
to avoid to overwrite the real environ.
A similar approach is used in `Two Scoops of Django`_ book and explained in `12factor-django`_ article.

Using django-environ you can stop to make a lot of unversioned ``settings_*.py`` to configure your app.
See `cookiecutter-django`_ for a concrete example on using with a django project.

Feature Support
---------------
- Fast and easy multi environment for deploy
- Fill ``os.environ`` with .env file variables
- Variables casting (see `Supported types`_ below)
- Url variables exploded to django specific package settings

Django-environ officially supports Django 1.8 ~ 2.0.


Installation
------------

.. code-block:: bash

$ pip install django-environ

*NOTE: No need to add it to INSTALLED_APPS.*


Then create a ``.env`` file:

.. code-block:: bash

DEBUG=on
SECRET_KEY=your-secret-key
DATABASE_URL=psql://urser:un-githubbedpassword@127.0.0.1:8458/database
SQLITE_URL=sqlite:///my-local-sqlite.db
CACHE_URL=memcache://127.0.0.1:11211,127.0.0.1:11212,127.0.0.1:11213
REDIS_URL=rediscache://127.0.0.1:6379/1?client_class=django_redis.client.DefaultClient&password=ungithubbed-secret

And use it with `settings.py`_ above.
Don't forget to add ``.env`` in your ``.gitignore`` (tip: add ``.env.example`` with a template of your variables).

Documentation
-------------

Documentation is available at `RTFD <http://django-environ.rtfd.io/>`_.

.. _`Supported types`:

Supported types
---------------

- str
- bool
- int
- float
- json
- list (FOO=a,b,c)
- tuple (FOO=(a,b,c))
- dict (BAR=key=val,foo=bar) #environ.Env(BAR=(dict, {}))
- dict (BAR=key=val;foo=1.1;baz=True) #environ.Env(BAR=(dict(value=unicode, cast=dict(foo=float,baz=bool)), {}))
- url
- path (environ.Path)
- db_url
- PostgreSQL: postgres://, pgsql://, psql:// or postgresql://
- PostGIS: postgis://
- MySQL: mysql:// or mysql2://
- MySQL for GeoDjango: mysqlgis://
- SQLITE: sqlite://
- SQLITE with SPATIALITE for GeoDjango: spatialite://
- Oracle: oracle://
- MSSQL: mssql://
- PyODBC: pyodbc://
- Redshift: redshift://
- LDAP: ldap://
- cache_url
- Database: dbcache://
- Dummy: dummycache://
- File: filecache://
- Memory: locmemcache://
- Memcached: memcache://
- Python memory: pymemcache://
- Redis: rediscache://
- search_url
- ElasticSearch: elasticsearch://
- Solr: solr://
- Whoosh: whoosh://
- Xapian: xapian://
- Simple cache: simple://
- email_url
- SMTP: smtp://
- SMTP+SSL: smtp+ssl://
- SMTP+TLS: smtp+tls://
- Console mail: consolemail://
- File mail: filemail://
- LocMem mail: memorymail://
- Dummy mail: dummymail://

Tips
----

Using unsafe characters in URLs
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

In order to use unsafe characters you have to encode with ``urllib.parse.encode`` before you set into ``.env`` file.

.. code-block:: bash

DATABASE_URL=mysql://user:%23password@127.0.0.1:3306/dbname

See https://perishablepress.com/stop-using-unsafe-characters-in-urls/ for reference.

Multiple redis cache locations
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

For redis cache, `multiple master/slave or shard locations <http://niwinz.github.io/django-redis/latest/#_pluggable_clients>`_ can be configured as follows:

.. code-block:: bash

CACHE_URL='rediscache://master:6379,slave1:6379,slave2:6379/1'

Email settings
~~~~~~~~~~~~~~

In order to set email configuration for django you can use this code:

.. code-block:: python

EMAIL_CONFIG = env.email_url(
'EMAIL_URL', default='smtp://user@:password@localhost:25')

vars().update(EMAIL_CONFIG)

SQLite urls
~~~~~~~~~~~

SQLite connects to file based databases. The same URL format is used, omitting the hostname,
and using the "file" portion as the filename of the database.
This has the effect of four slashes being present for an absolute

file path: ``sqlite:////full/path/to/your/database/file.sqlite``.

Nested lists
------------

Some settings such as Django's ``ADMINS`` make use of nested lists. You can use something like this to handle similar cases.

.. code-block:: python

# DJANGO_ADMINS=John:[e-mail],Jane:[e-mail]
ADMINS = [x.split(':') for x in env.list('DJANGO_ADMINS')]

# or use more specific function

from email.utils import getaddresses

# DJANGO_ADMINS=Full Name <[e-mail]>,[e-mail]
ADMINS = getaddresses([env('DJANGO_ADMINS')])

Multiline value
---------------

You can set a multiline variable value:

.. code-block:: python

# MULTILINE_TEXT=Hello\\nWorld
>>> print env.str('MULTILINE_TEXT', multiline=True)
Hello
World


Proxy value
-----------

You can set a value prefixed by ``$`` to use as a proxy to another variable value:

.. code-block:: python

# BAR=FOO
# PROXY=$BAR
>>> print env.str('PROXY')
FOO

Multiple env files
------------------
It is possible to have multiple env files and select one using environment variables.

.. code-block:: python
env = environ.Env()
env.read_env(env.str('ENV_PATH', '.env'))

Now ``ENV_PATH=other-env ./manage.py runserver`` uses ``other-env`` while ``./manage.py runserver`` uses ``.env``.

Tests
=====

::

$ git clone [e-mail]:joke2k/django-environ.git
$ cd django-environ/
$ python setup.py test

How to Contribute
-----------------
#. Check for open issues or open a fresh issue to start a discussion around a feature idea or a bug. There is a `Contributor Friendly`_ tag for issues that should be ideal for people who are not very familiar with the codebase yet.
#. Fork `the repository`_ on GitHub to start making your changes to the **develop** branch (or branch off of it).
#. Write a test which shows that the bug was fixed or that the feature works as expected.
#. Send a pull request and bug the maintainer until it gets merged and published. :) Make sure to add yourself to `Authors file`_.

License
-------

This project is licensed under the MIT License - see the `License file`_ file for details

Changelog
---------

See the `Changelog file`_ which format is *inspired* by `Keep a Changelog <http://keepachangelog.com/en/1.0.0/>`_.

Credits
-------
- See `Authors file`_
- `12factor`_
- `12factor-django`_
- `Two Scoops of Django`_
- `rconradharris`_ / `envparse`_
- `kennethreitz`_ / `dj-database-url`_
- `migonzalvar`_ / `dj-email-url`_
- `ghickman`_ / `django-cache-url`_
- `dstufft`_ / `dj-search-url`_
- `julianwachholz`_ / `dj-config-url`_
- `nickstenning`_ / `honcho`_
- `rconradharris`_ / `envparse`_
- `Distribute`_
- `modern-package-template`_

.. _rconradharris: https://github.com/rconradharris
.. _envparse: https://github.com/rconradharris/envparse

.. _kennethreitz: https://github.com/kennethreitz
.. _dj-database-url: https://github.com/kennethreitz/dj-database-url

.. _migonzalvar: https://github.com/migonzalvar
.. _dj-email-url: https://github.com/migonzalvar/dj-email-url

.. _ghickman: https://github.com/ghickman
.. _django-cache-url: https://github.com/ghickman/django-cache-url

.. _julianwachholz: https://github.com/julianwachholz
.. _dj-config-url: https://github.com/julianwachholz/dj-config-url

.. _dstufft: https://github.com/dstufft
.. _dj-search-url: https://github.com/dstufft/dj-search-url

.. _nickstenning: https://github.com/nickstenning
.. _honcho: https://github.com/nickstenning/honcho

.. _12factor: http://www.12factor.net/
.. _`Twelve-factor methodology`: http://www.12factor.net/
.. _12factor-django: http://www.wellfireinteractive.com/blog/easier-12-factor-django/
.. _`Two Scoops of Django`: http://twoscoopspress.org/

.. _Distribute: http://pypi.python.org/pypi/distribute
.. _`modern-package-template`: http://pypi.python.org/pypi/modern-package-template

.. _cookiecutter-django: https://github.com/pydanny/cookiecutter-django

.. |pypi| image:: https://img.shields.io/pypi/v/django-environ.svg?style=flat-square
:target: https://pypi.python.org/pypi/django-environ
:alt: Latest version released on PyPi

.. |coverage| image:: https://img.shields.io/coveralls/joke2k/django-environ/master.svg?style=flat-square
:target: https://coveralls.io/r/joke2k/django-environ?branch=master
:alt: Test coverage

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:target: http://travis-ci.org/joke2k/django-environ
:alt: Build status of the master branch on Mac/Linux

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:alt: Build status of the master branch on Windows

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:target: https://github.com/joke2k/django-environ/graphs/contributors

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:target: https://raw.githubusercontent.com/joke2k/django-environ/master/LICENSE.txt
:alt: Package license

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:target: https://saythanks.io/to/joke2k
:alt: Say Thanks!

.. |cover| image:: https://farm2.staticflickr.com/1745/42580036751_35f76a92fe_h.jpg
:alt: Photo by Singkham from Pexels

.. _`License file`: https://github.com/joke2k/django-environ/blob/develop/LICENSE.txt
.. _`Changelog file`: https://github.com/joke2k/django-environ/blob/develop/CHANGELOG.rst
.. _`Authors file`: https://github.com/joke2k/django-environ/blob/develop/AUTHORS.rst
.. _`Contributor Friendly`: https://github.com/joke2k/django-environ/issues?direction=desc&labels=contributor-friendly&page=1&sort=updated&state=open
.. _`the repository`: https://github.com/joke2k/django-environ