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Fixed #1292 -- Fixed potential circular-import problem in template loader. Thanks, Kieran Holland 

git-svn-id: http://code.djangoproject.com/svn/django/trunk@2226 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Adrian Holovaty 2006-02-02 05:07:12 +00:00
parent 9789766508
commit 2549b31970
1 changed files with 23 additions and 17 deletions
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40
django/core/template/loader.py
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@ -24,23 +24,7 @@ from django.core.exceptions import ImproperlyConfigured
from django.core.template import Origin, StringOrigin, Template, Context, TemplateDoesNotExist, add_to_builtins
from django.conf.settings import TEMPLATE_LOADERS, TEMPLATE_DEBUG
template_source_loaders = []
for path in TEMPLATE_LOADERS:
i = path.rfind('.')
module, attr = path[:i], path[i+1:]
try:
mod = __import__(module, globals(), locals(), [attr])
except ImportError, e:
raise ImproperlyConfigured, 'Error importing template source loader %s: "%s"' % (module, e)
try:
func = getattr(mod, attr)
except AttributeError:
raise ImproperlyConfigured, 'Module "%s" does not define a "%s" callable template source loader' % (module, attr)
if not func.is_usable:
import warnings
warnings.warn("Your TEMPLATE_LOADERS setting includes %r, but your Python installation doesn't support that type of template loading. Consider removing that line from TEMPLATE_LOADERS." % path)
else:
template_source_loaders.append(func)
template_source_loaders = None
class LoaderOrigin(Origin):
def __init__(self, display_name, loader, name, dirs):
@ -57,6 +41,28 @@ def make_origin(display_name, loader, name, dirs):
return None
def find_template_source(name, dirs=None):
# Calculate template_source_loaders the first time the function is executed
# because putting this logic in the module-level namespace may cause
# circular import errors. See Django ticket #1292.
global template_source_loaders
if template_source_loaders is None:
template_source_loaders = []
for path in TEMPLATE_LOADERS:
i = path.rfind('.')
module, attr = path[:i], path[i+1:]
try:
mod = __import__(module, globals(), locals(), [attr])
except ImportError, e:
raise ImproperlyConfigured, 'Error importing template source loader %s: "%s"' % (module, e)
try:
func = getattr(mod, attr)
except AttributeError:
raise ImproperlyConfigured, 'Module "%s" does not define a "%s" callable template source loader' % (module, attr)
if not func.is_usable:
import warnings
warnings.warn("Your TEMPLATE_LOADERS setting includes %r, but your Python installation doesn't support that type of template loading. Consider removing that line from TEMPLATE_LOADERS." % path)
else:
template_source_loaders.append(func)
for loader in template_source_loaders:
try:
source, display_name = loader(name, dirs)