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# This file is part of the django-environ.
#
# Copyright (c) 2021-2024, Serghei Iakovlev <oss@serghei.pl>
# Copyright (c) 2013-2021, Daniele Faraglia <daniele.faraglia@gmail.com>
#
# For the full copyright and license information, please view
# the LICENSE.txt file that was distributed with this source code.
"""This module handles import compatibility issues."""
from importlib.util import find_spec
if find_spec('simplejson'):
import simplejson as json
else:
import json
if find_spec('django'):
from django import VERSION as DJANGO_VERSION
from django.core.exceptions import ImproperlyConfigured
else:
DJANGO_VERSION = None
class ImproperlyConfigured(Exception):
"""Django is somehow improperly configured"""
def choose_rediscache_driver():
"""Backward compatibility for RedisCache driver."""
# django-redis library takes precedence
if find_spec('django_redis'):
return 'django_redis.cache.RedisCache'
# use built-in support if Django 4+
if DJANGO_VERSION is not None and DJANGO_VERSION >= (4, 0):
return 'django.core.cache.backends.redis.RedisCache'
# back compatibility with redis_cache package
return 'redis_cache.RedisCache'
def choose_postgres_driver():
"""Backward compatibility for postgresql driver."""
old_django = DJANGO_VERSION is not None and DJANGO_VERSION < (2, 0)
if old_django:
return 'django.db.backends.postgresql_psycopg2'
return 'django.db.backends.postgresql'
def choose_pymemcache_driver():
"""Backward compatibility for pymemcache."""
old_django = DJANGO_VERSION is not None and DJANGO_VERSION < (3, 2)
if old_django or not find_spec('pymemcache'):
# The original backend choice for the 'pymemcache' scheme is
# unfortunately 'pylibmc'.
return 'django.core.cache.backends.memcached.PyLibMCCache'
return 'django.core.cache.backends.memcached.PyMemcacheCache'
REDIS_DRIVER = choose_rediscache_driver()
"""The name of the RedisCache driver."""
DJANGO_POSTGRES = choose_postgres_driver()
"""The name of the PostgreSQL driver."""
PYMEMCACHE_DRIVER = choose_pymemcache_driver()
"""The name of the Pymemcache driver."""
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