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