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import os
import threading
import time
import warnings
from django.conf import settings
from django.core.signals import setting_changed
from django.db import connections, router
from django.db.utils import ConnectionRouter
from django.dispatch import Signal, receiver
from django.utils import timezone
from django.utils.functional import empty
template_rendered = Signal(providing_args=["template", "context"])
# Most setting_changed receivers are supposed to be added below,
# except for cases where the receiver is related to a contrib app.
# Settings that may not work well when using 'override_settings' (#19031)
COMPLEX_OVERRIDE_SETTINGS = {'DATABASES'}
@receiver(setting_changed)
def clear_cache_handlers(**kwargs):
if kwargs['setting'] == 'CACHES':
from django.core.cache import caches
caches._caches = threading.local()
@receiver(setting_changed)
def update_installed_apps(**kwargs):
if kwargs['setting'] == 'INSTALLED_APPS':
# Rebuild any AppDirectoriesFinder instance.
from django.contrib.staticfiles.finders import get_finder
get_finder.cache_clear()
# Rebuild management commands cache
from django.core.management import get_commands
get_commands.cache_clear()
# Rebuild templatetags module cache.
from django.template.base import get_templatetags_modules
get_templatetags_modules.cache_clear()
# Rebuild get_app_template_dirs cache.
from django.template.utils import get_app_template_dirs
get_app_template_dirs.cache_clear()
# Rebuild translations cache.
from django.utils.translation import trans_real
trans_real._translations = {}
@receiver(setting_changed)
def update_connections_time_zone(**kwargs):
if kwargs['setting'] == 'TIME_ZONE':
# Reset process time zone
if hasattr(time, 'tzset'):
if kwargs['value']:
os.environ['TZ'] = kwargs['value']
else:
os.environ.pop('TZ', None)
time.tzset()
# Reset local time zone cache
timezone.get_default_timezone.cache_clear()
# Reset the database connections' time zone
if kwargs['setting'] == 'USE_TZ' and settings.TIME_ZONE != 'UTC':
USE_TZ, TIME_ZONE = kwargs['value'], settings.TIME_ZONE
elif kwargs['setting'] == 'TIME_ZONE' and not settings.USE_TZ:
USE_TZ, TIME_ZONE = settings.USE_TZ, kwargs['value']
else:
# no need to change the database connnections' time zones
return
tz = 'UTC' if USE_TZ else TIME_ZONE
for conn in connections.all():
conn.settings_dict['TIME_ZONE'] = tz
tz_sql = conn.ops.set_time_zone_sql()
if tz_sql:
conn.cursor().execute(tz_sql, [tz])
@receiver(setting_changed)
def clear_routers_cache(**kwargs):
if kwargs['setting'] == 'DATABASE_ROUTERS':
router.routers = ConnectionRouter().routers
@receiver(setting_changed)
def reset_template_engines(**kwargs):
if kwargs['setting'] in {
'TEMPLATES',
'TEMPLATE_DIRS',
'ALLOWED_INCLUDE_ROOTS',
'TEMPLATE_CONTEXT_PROCESSORS',
'TEMPLATE_DEBUG',
'TEMPLATE_LOADERS',
'TEMPLATE_STRING_IF_INVALID',
'DEBUG',
'FILE_CHARSET',
'INSTALLED_APPS',
}:
from django.template import engines
try:
del engines.templates
except AttributeError:
pass
engines._templates = None
engines._engines = {}
from django.template.engine import Engine
Engine.get_default.cache_clear()
@receiver(setting_changed)
def clear_serializers_cache(**kwargs):
if kwargs['setting'] == 'SERIALIZATION_MODULES':
from django.core import serializers
serializers._serializers = {}
@receiver(setting_changed)
def language_changed(**kwargs):
if kwargs['setting'] in {'LANGUAGES', 'LANGUAGE_CODE', 'LOCALE_PATHS'}:
from django.utils.translation import trans_real
trans_real._default = None
trans_real._active = threading.local()
if kwargs['setting'] in {'LANGUAGES', 'LOCALE_PATHS'}:
from django.utils.translation import trans_real
trans_real._translations = {}
trans_real.check_for_language.cache_clear()
@receiver(setting_changed)
def file_storage_changed(**kwargs):
file_storage_settings = {
'DEFAULT_FILE_STORAGE',
'FILE_UPLOAD_DIRECTORY_PERMISSIONS',
'FILE_UPLOAD_PERMISSIONS',
'MEDIA_ROOT',
'MEDIA_URL',
}
if kwargs['setting'] in file_storage_settings:
from django.core.files.storage import default_storage
default_storage._wrapped = empty
@receiver(setting_changed)
def complex_setting_changed(**kwargs):
if kwargs['enter'] and kwargs['setting'] in COMPLEX_OVERRIDE_SETTINGS:
# Considering the current implementation of the signals framework,
# stacklevel=5 shows the line containing the override_settings call.
warnings.warn("Overriding setting %s can lead to unexpected behavior."
% kwargs['setting'], stacklevel=5)
@receiver(setting_changed)
def root_urlconf_changed(**kwargs):
if kwargs['setting'] == 'ROOT_URLCONF':
from django.core.urlresolvers import clear_url_caches, set_urlconf
clear_url_caches()
set_urlconf(None)
@receiver(setting_changed)
def static_storage_changed(**kwargs):
if kwargs['setting'] in {
'STATICFILES_STORAGE',
'STATIC_ROOT',
'STATIC_URL',
}:
from django.contrib.staticfiles.storage import staticfiles_storage
staticfiles_storage._wrapped = empty
@receiver(setting_changed)
def static_finders_changed(**kwargs):
if kwargs['setting'] in {
'STATICFILES_DIRS',
'STATIC_ROOT',
}:
from django.contrib.staticfiles.finders import get_finder
get_finder.cache_clear()
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