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"""
Settings and configuration for Django.
Values will be read from the module specified by the DJANGO_SETTINGS_MODULE environment
variable, and then from django.conf.global_settings; see the global settings file for
a list of all possible variables.
"""
import os
import time # Needed for Windows
import warnings
from django.conf import global_settings
from django.core.exceptions import ImproperlyConfigured
from django.utils.functional import LazyObject, empty
from django.utils import importlib
from django.utils import six
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):
"""
Load the settings module pointed to by the environment variable. This
is used the first time we need any settings at all, if the user has not
previously configured the settings manually.
"""
try:
settings_module = os.environ[ENVIRONMENT_VARIABLE]
if not settings_module: # If it's set but is an empty string.
raise KeyError
except KeyError:
raise ImproperlyConfigured(
"Requested setting %s, but settings are not configured. "
"You must either define the environment variable %s "
"or call settings.configure() before accessing settings."
% (name, ENVIRONMENT_VARIABLE))
self._wrapped = Settings(settings_module)
self._configure_logging()
def __getattr__(self, name):
if self._wrapped is empty:
self._setup(name)
return getattr(self._wrapped, name)
def _configure_logging(self):
"""
Setup logging from LOGGING_CONFIG and LOGGING settings.
"""
if self.LOGGING_CONFIG:
# First find the logging configuration function ...
logging_config_path, logging_config_func_name = self.LOGGING_CONFIG.rsplit('.', 1)
logging_config_module = importlib.import_module(logging_config_path)
logging_config_func = getattr(logging_config_module, logging_config_func_name)
# Backwards-compatibility shim for #16288 fix
compat_patch_logging_config(self.LOGGING)
# ... then invoke it with the logging settings
logging_config_func(self.LOGGING)
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):
"""
Returns True if the settings have already been configured.
"""
return self._wrapped is not empty
class BaseSettings(object):
"""
Common logic for settings whether set by a module or by the user.
"""
def __setattr__(self, name, value):
if name in ("MEDIA_URL", "STATIC_URL") and value and not value.endswith('/'):
raise ImproperlyConfigured("If set, %s must end with a slash" % name)
elif name == "ADMIN_MEDIA_PREFIX":
warnings.warn("The ADMIN_MEDIA_PREFIX setting has been removed; "
"use STATIC_URL instead.", DeprecationWarning)
elif name == "ALLOWED_INCLUDE_ROOTS" and isinstance(value, six.string_types):
raise ValueError("The ALLOWED_INCLUDE_ROOTS setting must be set "
"to a tuple, not a string.")
object.__setattr__(self, name, value)
class Settings(BaseSettings):
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 == setting.upper():
setattr(self, setting, getattr(global_settings, setting))
# store the settings module in case someone later cares
self.SETTINGS_MODULE = settings_module
try:
mod = importlib.import_module(self.SETTINGS_MODULE)
except ImportError as e:
raise ImportError("Could not import settings '%s' (Is it on sys.path?): %s" % (self.SETTINGS_MODULE, e))
# Settings that should be converted into tuples if they're mistakenly entered
# as strings.
tuple_settings = ("INSTALLED_APPS", "TEMPLATE_DIRS")
for setting in dir(mod):
if setting == setting.upper():
setting_value = getattr(mod, setting)
if setting in tuple_settings and \
isinstance(setting_value, six.string_types):
warnings.warn("The %s setting must be a tuple. Please fix your "
"settings, as auto-correction is now deprecated." % setting,
PendingDeprecationWarning)
setting_value = (setting_value,) # In case the user forgot the comma.
setattr(self, setting, setting_value)
if not self.SECRET_KEY:
raise ImproperlyConfigured("The SECRET_KEY setting must not be empty.")
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 = '/usr/share/zoneinfo'
if (os.path.exists(zoneinfo_root) and not
os.path.exists(os.path.join(zoneinfo_root, *(self.TIME_ZONE.split('/'))))):
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()
class UserSettingsHolder(BaseSettings):
"""
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)
return super(UserSettingsHolder, self).__setattr__(name, value)
def __delattr__(self, name):
self._deleted.add(name)
return super(UserSettingsHolder, self).__delattr__(name)
def __dir__(self):
return list(self.__dict__) + dir(self.default_settings)
settings = LazySettings()
def compat_patch_logging_config(logging_config):
"""
Backwards-compatibility shim for #16288 fix. Takes initial value of
``LOGGING`` setting and patches it in-place (issuing deprecation warning)
if "mail_admins" logging handler is configured but has no filters.
"""
# Shim only if LOGGING["handlers"]["mail_admins"] exists,
# but has no "filters" key
if "filters" not in logging_config.get(
"handlers", {}).get(
"mail_admins", {"filters": []}):
warnings.warn(
"You have no filters defined on the 'mail_admins' logging "
"handler: adding implicit debug-false-only filter. "
"See http://docs.djangoproject.com/en/dev/releases/1.4/"
"#request-exceptions-are-now-always-logged",
DeprecationWarning)
filter_name = "require_debug_false"
filters = logging_config.setdefault("filters", {})
while filter_name in filters:
filter_name = filter_name + "_"
filters[filter_name] = {
"()": "django.utils.log.RequireDebugFalse",
}
logging_config["handlers"]["mail_admins"]["filters"] = [filter_name]
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