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