author | Sverre Rabbelier <srabbelier@gmail.com> |
Tue, 02 Dec 2008 22:04:15 +0000 | |
changeset 652 | 02323664d532 |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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""" |
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Settings and configuration for Django. |
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|
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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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|
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import os |
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import time # Needed for Windows |
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from django.conf import global_settings |
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|
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ENVIRONMENT_VARIABLE = "DJANGO_SETTINGS_MODULE" |
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|
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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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|
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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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if self._target is None: |
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self._import_settings() |
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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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# 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._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 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._target = 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._target) |
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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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|
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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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|
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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 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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|
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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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|
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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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|
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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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app_subdirs = os.listdir(appdir) |
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app_subdirs.sort() |
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for d in app_subdirs: |
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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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|
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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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|
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def get_all_members(self): |
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return dir(self) |
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|
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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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|
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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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|
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def __getattr__(self, name): |
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return getattr(self.default_settings, name) |
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|
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def get_all_members(self): |
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return dir(self) + dir(self.default_settings) |
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|
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settings = LazySettings() |
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153 |