mirror of
https://github.com/jazzband/django-configurations.git
synced 2026-03-16 22:20:27 +00:00
8b78278921
if obj = cls() do have an attribute error inside it's initialization, it will appears as if the module could not be find. which is hard to troubleshoot, when the module is really there :)
79 lines
2.4 KiB
Python
79 lines
2.4 KiB
Python
import imp
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import os
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import sys
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from django.core.exceptions import ImproperlyConfigured
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from django.conf import ENVIRONMENT_VARIABLE
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from .utils import uppercase_attributes
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installed = False
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def install():
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global installed
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if not installed:
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sys.meta_path.append(SettingsImporter())
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installed = True
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class SettingsImporter(object):
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class_varname = 'DJANGO_CONFIGURATION'
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error_msg = "Settings cannot be imported, environment variable %s is undefined."
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def __init__(self):
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self.validate()
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def __repr__(self):
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return "<SettingsImporter for '%s.%s'>" % (self.module, self.name)
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@property
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def module(self):
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return os.environ.get(ENVIRONMENT_VARIABLE)
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@property
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def name(self):
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return os.environ.get(self.class_varname)
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def validate(self):
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if self.name is None:
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raise ImproperlyConfigured(self.error_msg % self.class_varname)
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if self.module is None:
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raise ImproperlyConfigured(self.error_msg % ENVIRONMENT_VARIABLE)
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def find_module(self, fullname, path=None):
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if fullname is not None and fullname == self.module:
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module = fullname.rsplit('.', 1)[-1]
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return SettingsLoader(self.name, imp.find_module(module, path))
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return None
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class SettingsLoader(object):
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def __init__(self, name, location):
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self.name = name
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self.location = location
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def load_module(self, fullname):
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if fullname in sys.modules:
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mod = sys.modules[fullname] # pragma: no cover
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else:
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mod = imp.load_module(fullname, *self.location)
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try:
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cls = getattr(mod, self.name)
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except AttributeError: # pragma: no cover
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raise ImproperlyConfigured("Couldn't find settings '%s' in "
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"module '%s'" %
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(self.name, mod.__package__))
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try:
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obj = cls()
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except Exception, err:
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raise ImproperlyConfigured("Couldn't load settings '%s.%s': %s" %
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(mod.__name__, self.name, err))
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for name, value in uppercase_attributes(obj).items():
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if callable(value):
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value = value()
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setattr(mod, name, value)
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setattr(mod, 'CONFIGURATION', '%s.%s' % (fullname, self.name))
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return mod
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