143 lines
5.5 KiB
Python
143 lines
5.5 KiB
Python
"""
|
|
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
|
|
from django.conf import global_settings
|
|
|
|
ENVIRONMENT_VARIABLE = "DJANGO_SETTINGS_MODULE"
|
|
|
|
class LazySettings(object):
|
|
"""
|
|
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 __init__(self):
|
|
# _target must be either None or something that supports attribute
|
|
# access (getattr, hasattr, etc).
|
|
self._target = None
|
|
|
|
def __getattr__(self, name):
|
|
if self._target is None:
|
|
self._import_settings()
|
|
if name == '__members__':
|
|
# Used to implement dir(obj), for example.
|
|
return self._target.get_all_members()
|
|
return getattr(self._target, name)
|
|
|
|
def __setattr__(self, name, value):
|
|
if name == '_target':
|
|
# Assign directly to self.__dict__, because otherwise we'd call
|
|
# __setattr__(), which would be an infinite loop.
|
|
self.__dict__['_target'] = value
|
|
else:
|
|
if self._target is None:
|
|
self._import_settings()
|
|
setattr(self._target, name, value)
|
|
|
|
def _import_settings(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:
|
|
raise ImportError, "Environment variable %s is undefined so settings cannot be imported." % ENVIRONMENT_VARIABLE # NOTE: This is arguably an EnvironmentError, but that causes problems with Python's interactive help
|
|
|
|
self._target = 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._target != None:
|
|
raise RuntimeError, 'Settings already configured.'
|
|
holder = UserSettingsHolder(default_settings)
|
|
for name, value in options.items():
|
|
setattr(holder, name, value)
|
|
self._target = holder
|
|
|
|
class Settings(object):
|
|
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 = __import__(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('.*'):
|
|
appdir = os.path.dirname(__import__(app[:-2], {}, {}, ['']).__file__)
|
|
for d in os.listdir(appdir):
|
|
if d.isalpha() 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'):
|
|
# 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 get_all_members(self):
|
|
return dir(self)
|
|
|
|
class UserSettingsHolder(object):
|
|
"""
|
|
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 get_all_members(self):
|
|
return dir(self) + dir(self.default_settings)
|
|
|
|
settings = LazySettings()
|
|
|