django1/django/test/signals.py

134 lines
4.6 KiB
Python

import os
import time
import threading
import warnings
from django.conf import settings
from django.db import connections
from django.dispatch import receiver, Signal
from django.utils import timezone
from django.utils.functional import empty
template_rendered = Signal(providing_args=["template", "context"])
setting_changed = Signal(providing_args=["setting", "value", "enter"])
# 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 = set(['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 import base as mod
mod.templatetags_modules = []
# Rebuild app_template_dirs cache.
from django.template.loaders import app_directories as mod
mod.app_template_dirs = mod.calculate_app_template_dirs()
# 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._localtime = None
# 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_context_processors_cache(**kwargs):
if kwargs['setting'] == 'TEMPLATE_CONTEXT_PROCESSORS':
from django.template import context
context._standard_context_processors = None
@receiver(setting_changed)
def clear_template_loaders_cache(**kwargs):
if kwargs['setting'] == 'TEMPLATE_LOADERS':
from django.template import loader
loader.template_source_loaders = None
@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):
if kwargs['setting'] in ('MEDIA_ROOT', 'DEFAULT_FILE_STORAGE'):
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 behaviour."
% 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
clear_url_caches()