/django/conf/__init__.py
Python | 167 lines | 107 code | 20 blank | 40 comment | 19 complexity | a24a462f39389ea56784cfe122197d0e MD5 | raw file
- """
- 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 re
- import time # Needed for Windows
- import warnings
- from django.conf import global_settings
- from django.utils.functional import LazyObject
- from django.utils import importlib
- 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):
- """
- 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:
- # NOTE: This is arguably an EnvironmentError, but that causes
- # problems with Python's interactive help.
- raise ImportError("Settings cannot be imported, because environment variable %s is undefined." % ENVIRONMENT_VARIABLE)
- self._wrapped = Settings(settings_module)
- 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 != None:
- raise RuntimeError('Settings already configured.')
- holder = UserSettingsHolder(default_settings)
- for name, value in options.items():
- setattr(holder, name, value)
- self._wrapped = holder
- def configured(self):
- """
- Returns True if the settings have already been configured.
- """
- return bool(self._wrapped)
- configured = property(configured)
- 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('/'):
- warnings.warn('If set, %s must end with a slash' % name,
- PendingDeprecationWarning)
- 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, e:
- raise ImportError("Could not import settings '%s' (Is it on sys.path? Does it have syntax errors?): %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 type(setting_value) == str:
- setting_value = (setting_value,) # In case the user forgot the comma.
- setattr(self, setting, setting_value)
- # Expand entries in INSTALLED_APPS like "django.contrib.*" to a list
- # of all those apps.
- new_installed_apps = []
- for app in self.INSTALLED_APPS:
- if app.endswith('.*'):
- app_mod = importlib.import_module(app[:-2])
- appdir = os.path.dirname(app_mod.__file__)
- app_subdirs = os.listdir(appdir)
- app_subdirs.sort()
- name_pattern = re.compile(r'[a-zA-Z]\w*')
- for d in app_subdirs:
- if name_pattern.match(d) and os.path.isdir(os.path.join(appdir, d)):
- new_installed_apps.append('%s.%s' % (app[:-2], d))
- else:
- new_installed_apps.append(app)
- self.INSTALLED_APPS = new_installed_apps
- 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()
- # Settings are configured, so we can set up the logger if required
- 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)
- # ... then invoke it with the logging settings
- logging_config_func(self.LOGGING)
- 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.default_settings = default_settings
- def __getattr__(self, name):
- return getattr(self.default_settings, name)
- def __dir__(self):
- return self.__dict__.keys() + dir(self.default_settings)
- # For Python < 2.6:
- __members__ = property(lambda self: self.__dir__())
- settings = LazySettings()