137 lines
5.2 KiB
Python
137 lines
5.2 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 os
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import re
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import time # Needed for Windows
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from django.conf import global_settings
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from django.utils.functional import LazyObject
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from django.utils import importlib
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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):
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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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# NOTE: This is arguably an EnvironmentError, but that causes
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# problems with Python's interactive help.
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raise ImportError("Settings cannot be imported, because environment variable %s is undefined." % ENVIRONMENT_VARIABLE)
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self._wrapped = Settings(settings_module)
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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 != None:
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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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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 bool(self._wrapped)
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configured = property(configured)
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class Settings(object):
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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, e:
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raise ImportError, "Could not import settings '%s' (Is it on sys.path? Does it have syntax errors?): %s" % (self.SETTINGS_MODULE, e)
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# Settings that should be converted into tuples if they're mistakenly entered
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# as strings.
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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 type(setting_value) == str:
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setting_value = (setting_value,) # In case the user forgot the comma.
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setattr(self, setting, setting_value)
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# Expand entries in INSTALLED_APPS like "django.contrib.*" to a list
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# of all those apps.
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new_installed_apps = []
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for app in self.INSTALLED_APPS:
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if app.endswith('.*'):
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app_mod = importlib.import_module(app[:-2])
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appdir = os.path.dirname(app_mod.__file__)
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app_subdirs = os.listdir(appdir)
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app_subdirs.sort()
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name_pattern = re.compile(r'[a-zA-Z]\w*')
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for d in app_subdirs:
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if name_pattern.match(d) and os.path.isdir(os.path.join(appdir, d)):
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new_installed_apps.append('%s.%s' % (app[:-2], d))
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else:
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new_installed_apps.append(app)
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self.INSTALLED_APPS = new_installed_apps
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if hasattr(time, 'tzset'):
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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(object):
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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.default_settings = default_settings
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def __getattr__(self, name):
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return getattr(self.default_settings, name)
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def __dir__(self):
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return self.__dict__.keys() + dir(self.default_settings)
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# For Python < 2.6:
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__members__ = property(lambda self: self.__dir__())
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settings = LazySettings()
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