198 lines
7.4 KiB
Python
198 lines
7.4 KiB
Python
"""
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Settings and configuration for Django.
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Values will be read from the module specified by the DJANGO_SETTINGS_MODULE environment
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variable, and then from django.conf.global_settings; see the global settings file for
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a list of all possible variables.
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"""
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import importlib
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import logging
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import os
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import sys
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import time # Needed for Windows
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import warnings
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from django.conf import global_settings
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from django.core.exceptions import ImproperlyConfigured
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from django.utils.functional import LazyObject, empty
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from django.utils.module_loading import import_by_path
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from django.utils import six
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ENVIRONMENT_VARIABLE = "DJANGO_SETTINGS_MODULE"
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class LazySettings(LazyObject):
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"""
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A lazy proxy for either global Django settings or a custom settings object.
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The user can manually configure settings prior to using them. Otherwise,
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Django uses the settings module pointed to by DJANGO_SETTINGS_MODULE.
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"""
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def _setup(self, name=None):
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"""
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Load the settings module pointed to by the environment variable. This
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is used the first time we need any settings at all, if the user has not
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previously configured the settings manually.
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"""
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try:
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settings_module = os.environ[ENVIRONMENT_VARIABLE]
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if not settings_module: # If it's set but is an empty string.
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raise KeyError
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except KeyError:
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desc = ("setting %s" % name) if name else "settings"
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raise ImproperlyConfigured(
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"Requested %s, but settings are not configured. "
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"You must either define the environment variable %s "
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"or call settings.configure() before accessing settings."
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% (desc, ENVIRONMENT_VARIABLE))
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self._wrapped = Settings(settings_module)
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self._configure_logging()
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def __getattr__(self, name):
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if self._wrapped is empty:
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self._setup(name)
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return getattr(self._wrapped, name)
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def _configure_logging(self):
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"""
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Setup logging from LOGGING_CONFIG and LOGGING settings.
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"""
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if not sys.warnoptions:
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# Route warnings through python logging
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logging.captureWarnings(True)
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# Allow DeprecationWarnings through the warnings filters
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warnings.simplefilter("default", DeprecationWarning)
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if self.LOGGING_CONFIG:
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from django.utils.log import DEFAULT_LOGGING
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# First find the logging configuration function ...
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logging_config_func = import_by_path(self.LOGGING_CONFIG)
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logging_config_func(DEFAULT_LOGGING)
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# ... then invoke it with the logging settings
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if self.LOGGING:
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logging_config_func(self.LOGGING)
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def configure(self, default_settings=global_settings, **options):
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"""
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Called to manually configure the settings. The 'default_settings'
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parameter sets where to retrieve any unspecified values from (its
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argument must support attribute access (__getattr__)).
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"""
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if self._wrapped is not empty:
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raise RuntimeError('Settings already configured.')
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holder = UserSettingsHolder(default_settings)
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for name, value in options.items():
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setattr(holder, name, value)
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self._wrapped = holder
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self._configure_logging()
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@property
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def configured(self):
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"""
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Returns True if the settings have already been configured.
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"""
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return self._wrapped is not empty
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class BaseSettings(object):
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"""
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Common logic for settings whether set by a module or by the user.
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"""
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def __setattr__(self, name, value):
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if name in ("MEDIA_URL", "STATIC_URL") and value and not value.endswith('/'):
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raise ImproperlyConfigured("If set, %s must end with a slash" % name)
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elif name == "ALLOWED_INCLUDE_ROOTS" and isinstance(value, six.string_types):
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raise ValueError("The ALLOWED_INCLUDE_ROOTS setting must be set "
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"to a tuple, not a string.")
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elif name == "INSTALLED_APPS":
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value = list(value) # force evaluation of generators on Python 3
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if len(value) != len(set(value)):
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raise ImproperlyConfigured("The INSTALLED_APPS setting must contain unique values.")
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object.__setattr__(self, name, value)
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class Settings(BaseSettings):
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def __init__(self, settings_module):
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# update this dict from global settings (but only for ALL_CAPS settings)
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for setting in dir(global_settings):
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if setting == setting.upper():
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setattr(self, setting, getattr(global_settings, setting))
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# store the settings module in case someone later cares
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self.SETTINGS_MODULE = settings_module
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try:
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mod = importlib.import_module(self.SETTINGS_MODULE)
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except ImportError as e:
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raise ImportError(
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"Could not import settings '%s' (Is it on sys.path? Is there an import error in the settings file?): %s"
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% (self.SETTINGS_MODULE, e)
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)
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tuple_settings = ("INSTALLED_APPS", "TEMPLATE_DIRS")
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for setting in dir(mod):
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if setting == setting.upper():
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setting_value = getattr(mod, setting)
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if setting in tuple_settings and \
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isinstance(setting_value, six.string_types):
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raise ImproperlyConfigured("The %s setting must be a tuple. "
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"Please fix your settings." % setting)
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setattr(self, setting, setting_value)
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if not self.SECRET_KEY:
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raise ImproperlyConfigured("The SECRET_KEY setting must not be empty.")
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if hasattr(time, 'tzset') and self.TIME_ZONE:
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# When we can, attempt to validate the timezone. If we can't find
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# this file, no check happens and it's harmless.
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zoneinfo_root = '/usr/share/zoneinfo'
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if (os.path.exists(zoneinfo_root) and not
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os.path.exists(os.path.join(zoneinfo_root, *(self.TIME_ZONE.split('/'))))):
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raise ValueError("Incorrect timezone setting: %s" % self.TIME_ZONE)
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# Move the time zone info into os.environ. See ticket #2315 for why
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# we don't do this unconditionally (breaks Windows).
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os.environ['TZ'] = self.TIME_ZONE
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time.tzset()
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class UserSettingsHolder(BaseSettings):
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"""
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Holder for user configured settings.
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"""
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# SETTINGS_MODULE doesn't make much sense in the manually configured
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# (standalone) case.
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SETTINGS_MODULE = None
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def __init__(self, default_settings):
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"""
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Requests for configuration variables not in this class are satisfied
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from the module specified in default_settings (if possible).
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"""
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self.__dict__['_deleted'] = set()
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self.default_settings = default_settings
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def __getattr__(self, name):
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if name in self._deleted:
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raise AttributeError
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return getattr(self.default_settings, name)
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def __setattr__(self, name, value):
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self._deleted.discard(name)
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return super(UserSettingsHolder, self).__setattr__(name, value)
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def __delattr__(self, name):
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self._deleted.add(name)
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return super(UserSettingsHolder, self).__delattr__(name)
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def __dir__(self):
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return list(self.__dict__) + dir(self.default_settings)
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settings = LazySettings()
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