django-dbtemplates/dbtemplates/utils.py
2011-04-14 13:45:22 +02:00

93 lines
3 KiB
Python

from django import VERSION
from django.core.cache import get_cache
from django.template import TemplateDoesNotExist
from django.utils.importlib import import_module
from django.contrib.sites.models import Site
from dbtemplates import settings
def get_cache_backend():
return get_cache(settings.CACHE_BACKEND)
cache = get_cache_backend()
def add_default_site(instance, **kwargs):
"""
Called via Django's signals to cache the templates, if the template
in the database was added or changed, only if DBTEMPLATES_ADD_DEFAULT_SITE
setting is set.
"""
if settings.ADD_DEFAULT_SITE:
current_site = Site.objects.get_current()
if current_site not in instance.sites.all():
instance.sites.add(current_site)
def get_cache_key(name):
current_site = Site.objects.get_current()
return 'dbtemplates::%s::%s' % (name, current_site.pk)
def add_template_to_cache(instance, **kwargs):
"""
Called via Django's signals to cache the templates, if the template
in the database was added or changed.
"""
remove_cached_template(instance)
cache.set(get_cache_key(instance.name), instance.content)
def remove_cached_template(instance, **kwargs):
"""
Called via Django's signals to remove cached templates, if the template
in the database was changed or deleted.
"""
cache.delete(get_cache_key(instance.name))
def get_loaders():
from django.template.loader import template_source_loaders
if template_source_loaders is None:
try:
from django.template.loader import (
find_template as finder_func)
except ImportError:
from django.template.loader import (
find_template_source as finder_func)
try:
source, name = finder_func('test')
except TemplateDoesNotExist:
pass
from django.template.loader import template_source_loaders
return template_source_loaders or []
def get_template_source(name):
source = None
for loader in get_loaders():
if loader.__module__.startswith('dbtemplates.'):
# Don't give a damn about dbtemplates' own loader.
continue
module = import_module(loader.__module__)
load_template_source = getattr(module, 'load_template_source', None)
if load_template_source is None:
load_template_source = loader.load_template_source
try:
source, origin = load_template_source(name)
if source:
return source
except TemplateDoesNotExist:
pass
if source is None and VERSION[:2] < (1, 2):
# Django supported template source extraction still :/
try:
from django.template.loader import find_template_source
template, origin = find_template_source(name, None)
if not hasattr(template, 'render'):
return template
except (ImportError, TemplateDoesNotExist):
pass
return None