202 lines
7.3 KiB
Python
202 lines
7.3 KiB
Python
"""
|
|
Settings and configuration for Django.
|
|
|
|
Read values from the module specified by the DJANGO_SETTINGS_MODULE environment
|
|
variable, and then from django.conf.global_settings; see the global_settings.py
|
|
for a list of all possible variables.
|
|
"""
|
|
|
|
import importlib
|
|
import os
|
|
import time
|
|
import warnings
|
|
from pathlib import Path
|
|
|
|
from django.conf import global_settings
|
|
from django.core.exceptions import ImproperlyConfigured
|
|
from django.utils.deprecation import RemovedInDjango30Warning
|
|
from django.utils.functional import LazyObject, empty
|
|
|
|
ENVIRONMENT_VARIABLE = "DJANGO_SETTINGS_MODULE"
|
|
|
|
|
|
class LazySettings(LazyObject):
|
|
"""
|
|
A lazy proxy for either global Django settings or a custom settings object.
|
|
The user can manually configure settings prior to using them. Otherwise,
|
|
Django uses the settings module pointed to by DJANGO_SETTINGS_MODULE.
|
|
"""
|
|
def _setup(self, name=None):
|
|
"""
|
|
Load the settings module pointed to by the environment variable. This
|
|
is used the first time settings are needed, if the user hasn't
|
|
configured settings manually.
|
|
"""
|
|
settings_module = os.environ.get(ENVIRONMENT_VARIABLE)
|
|
if not settings_module:
|
|
desc = ("setting %s" % name) if name else "settings"
|
|
raise ImproperlyConfigured(
|
|
"Requested %s, but settings are not configured. "
|
|
"You must either define the environment variable %s "
|
|
"or call settings.configure() before accessing settings."
|
|
% (desc, ENVIRONMENT_VARIABLE))
|
|
|
|
self._wrapped = Settings(settings_module)
|
|
|
|
def __repr__(self):
|
|
# Hardcode the class name as otherwise it yields 'Settings'.
|
|
if self._wrapped is empty:
|
|
return '<LazySettings [Unevaluated]>'
|
|
return '<LazySettings "%(settings_module)s">' % {
|
|
'settings_module': self._wrapped.SETTINGS_MODULE,
|
|
}
|
|
|
|
def __getattr__(self, name):
|
|
"""Return the value of a setting and cache it in self.__dict__."""
|
|
if self._wrapped is empty:
|
|
self._setup(name)
|
|
val = getattr(self._wrapped, name)
|
|
self.__dict__[name] = val
|
|
return val
|
|
|
|
def __setattr__(self, name, value):
|
|
"""
|
|
Set the value of setting. Clear all cached values if _wrapped changes
|
|
(@override_settings does this) or clear single values when set.
|
|
"""
|
|
if name == '_wrapped':
|
|
self.__dict__.clear()
|
|
else:
|
|
self.__dict__.pop(name, None)
|
|
super().__setattr__(name, value)
|
|
|
|
def __delattr__(self, name):
|
|
"""Delete a setting and clear it from cache if needed."""
|
|
super().__delattr__(name)
|
|
self.__dict__.pop(name, None)
|
|
|
|
def configure(self, default_settings=global_settings, **options):
|
|
"""
|
|
Called to manually configure the settings. The 'default_settings'
|
|
parameter sets where to retrieve any unspecified values from (its
|
|
argument must support attribute access (__getattr__)).
|
|
"""
|
|
if self._wrapped is not empty:
|
|
raise RuntimeError('Settings already configured.')
|
|
holder = UserSettingsHolder(default_settings)
|
|
for name, value in options.items():
|
|
setattr(holder, name, value)
|
|
self._wrapped = holder
|
|
|
|
@property
|
|
def configured(self):
|
|
"""Return True if the settings have already been configured."""
|
|
return self._wrapped is not empty
|
|
|
|
|
|
class Settings:
|
|
def __init__(self, settings_module):
|
|
# update this dict from global settings (but only for ALL_CAPS settings)
|
|
for setting in dir(global_settings):
|
|
if setting.isupper():
|
|
setattr(self, setting, getattr(global_settings, setting))
|
|
|
|
# store the settings module in case someone later cares
|
|
self.SETTINGS_MODULE = settings_module
|
|
|
|
mod = importlib.import_module(self.SETTINGS_MODULE)
|
|
|
|
tuple_settings = (
|
|
"INSTALLED_APPS",
|
|
"TEMPLATE_DIRS",
|
|
"LOCALE_PATHS",
|
|
)
|
|
self._explicit_settings = set()
|
|
for setting in dir(mod):
|
|
if setting.isupper():
|
|
setting_value = getattr(mod, setting)
|
|
|
|
if (setting in tuple_settings and
|
|
not isinstance(setting_value, (list, tuple))):
|
|
raise ImproperlyConfigured("The %s setting must be a list or a tuple. " % setting)
|
|
setattr(self, setting, setting_value)
|
|
self._explicit_settings.add(setting)
|
|
|
|
if not self.SECRET_KEY:
|
|
raise ImproperlyConfigured("The SECRET_KEY setting must not be empty.")
|
|
|
|
if self.is_overridden('DEFAULT_CONTENT_TYPE'):
|
|
warnings.warn('The DEFAULT_CONTENT_TYPE setting is deprecated.', RemovedInDjango30Warning)
|
|
|
|
if hasattr(time, 'tzset') and self.TIME_ZONE:
|
|
# When we can, attempt to validate the timezone. If we can't find
|
|
# this file, no check happens and it's harmless.
|
|
zoneinfo_root = Path('/usr/share/zoneinfo')
|
|
zone_info_file = zoneinfo_root.joinpath(*self.TIME_ZONE.split('/'))
|
|
if zoneinfo_root.exists() and not zone_info_file.exists():
|
|
raise ValueError("Incorrect timezone setting: %s" % self.TIME_ZONE)
|
|
# Move the time zone info into os.environ. See ticket #2315 for why
|
|
# we don't do this unconditionally (breaks Windows).
|
|
os.environ['TZ'] = self.TIME_ZONE
|
|
time.tzset()
|
|
|
|
def is_overridden(self, setting):
|
|
return setting in self._explicit_settings
|
|
|
|
def __repr__(self):
|
|
return '<%(cls)s "%(settings_module)s">' % {
|
|
'cls': self.__class__.__name__,
|
|
'settings_module': self.SETTINGS_MODULE,
|
|
}
|
|
|
|
|
|
class UserSettingsHolder:
|
|
"""Holder for user configured settings."""
|
|
# SETTINGS_MODULE doesn't make much sense in the manually configured
|
|
# (standalone) case.
|
|
SETTINGS_MODULE = None
|
|
|
|
def __init__(self, default_settings):
|
|
"""
|
|
Requests for configuration variables not in this class are satisfied
|
|
from the module specified in default_settings (if possible).
|
|
"""
|
|
self.__dict__['_deleted'] = set()
|
|
self.default_settings = default_settings
|
|
|
|
def __getattr__(self, name):
|
|
if name in self._deleted:
|
|
raise AttributeError
|
|
return getattr(self.default_settings, name)
|
|
|
|
def __setattr__(self, name, value):
|
|
self._deleted.discard(name)
|
|
if name == 'DEFAULT_CONTENT_TYPE':
|
|
warnings.warn('The DEFAULT_CONTENT_TYPE setting is deprecated.', RemovedInDjango30Warning)
|
|
super().__setattr__(name, value)
|
|
|
|
def __delattr__(self, name):
|
|
self._deleted.add(name)
|
|
if hasattr(self, name):
|
|
super().__delattr__(name)
|
|
|
|
def __dir__(self):
|
|
return sorted(
|
|
s for s in list(self.__dict__) + dir(self.default_settings)
|
|
if s not in self._deleted
|
|
)
|
|
|
|
def is_overridden(self, setting):
|
|
deleted = (setting in self._deleted)
|
|
set_locally = (setting in self.__dict__)
|
|
set_on_default = getattr(self.default_settings, 'is_overridden', lambda s: False)(setting)
|
|
return deleted or set_locally or set_on_default
|
|
|
|
def __repr__(self):
|
|
return '<%(cls)s>' % {
|
|
'cls': self.__class__.__name__,
|
|
}
|
|
|
|
|
|
settings = LazySettings()
|