141 lines
5.3 KiB
Python
141 lines
5.3 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 sys
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from django.conf import global_settings
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ENVIRONMENT_VARIABLE = "DJANGO_SETTINGS_MODULE"
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class LazySettings(object):
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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 __init__(self):
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# _target must be either None or something that supports attribute
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# access (getattr, hasattr, etc).
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self._target = None
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def __getattr__(self, name):
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if self._target is None:
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self._import_settings()
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if name == '__members__':
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# Used to implement dir(obj), for example.
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return self._target.get_all_members()
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return getattr(self._target, name)
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def __setattr__(self, name, value):
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if name == '_target':
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# Assign directly to self.__dict__, because otherwise we'd call
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# __setattr__(), which would be an infinite loop.
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self.__dict__['_target'] = value
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else:
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setattr(self._target, name, value)
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def _import_settings(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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raise EnvironmentError, "Environment variable %s is undefined." % ENVIRONMENT_VARIABLE
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self._target = 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._target != None:
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raise EnvironmentError, '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._target = holder
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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 = __import__(self.SETTINGS_MODULE, '', '', [''])
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except ImportError, e:
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raise EnvironmentError, "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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appdir = os.path.dirname(__import__(app[:-2], '', '', ['']).__file__)
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for d in os.listdir(appdir):
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if d.isalpha() 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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# move the time zone info into os.environ
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os.environ['TZ'] = self.TIME_ZONE
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def get_all_members(self):
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return dir(self)
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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 does not really make 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 get_all_members(self):
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return dir(self) + dir(self.default_settings)
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settings = LazySettings()
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# install the translation machinery so that it is available
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from django.utils import translation
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translation.install()
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