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added filesystem-based caching of dbtemplates (configured via settings.DBTEMPLATES_CACHE_DIR). docs and tests still missing.

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git-svn-id: https://django-dbtemplates.googlecode.com/svn/trunk@22 cfb8ba98-e953-0410-9cff-959ffddf5974

committer: arne@rcs4u.de <arne@rcs4u.de@cfb8ba98-e953-0410-9cff-959ffddf5974>

--HG--
extra : convert_revision : 633aadf3de216f42398f8c57a93d68c28946da3a
This commit is contained in:
arne@rcs4u.de 2008-04-17 10:20:09 +00:00
parent d4a634ecb3
commit dae109748b
1 changed files with 37 additions and 5 deletions
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42
dbtemplates/loader.py
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@ -1,4 +1,7 @@
import os
from django.conf import settings
from django.dispatch import dispatcher
from django.db.models import signals
from django.template import TemplateDoesNotExist
from django.contrib.sites.models import Site
@ -9,16 +12,45 @@ try:
except:
site = None
try:
cache_dir = os.path.normpath(getattr(settings, 'DBTEMPLATES_CACHE_DIR', None))
if not os.path.isdir(cache_dir):
raise
except:
cache_dir = None
def load_template_source(template_name, template_dirs=None):
"""
Loads templates from the database by querying the database field ``name``
with a template path and ``sites`` with the current site.
"""
if site is not None:
if cache_dir is not None:
filepath = os.path.join(cache_dir, template_name)
try:
t = Template.objects.get(name__exact=template_name, sites__pk=site.id)
return (t.content, 'db:%s:%s' % (settings.DATABASE_ENGINE, template_name))
except:
pass
return (open(filepath).read(), filepath)
except IOError:
try:
t = Template.objects.get(name__exact=template_name, sites__pk=site.id)
try:
f = open(filepath, 'w')
f.write(t.content)
f.close()
except IOError:
pass
return (t.content, 'db:%s:%s' % (settings.DATABASE_ENGINE, template_name))
except:
pass
raise TemplateDoesNotExist, template_name
load_template_source.is_usable = True
load_template_source.is_usable = True
def remove_cached_template(instance):
try:
filepath = os.path.join(cache_dir, instance.name)
os.remove(filepath)
except OSError:
pass
dispatcher.connect(remove_cached_template, sender=Template, signal=signals.post_save)
dispatcher.connect(remove_cached_template, sender=Template, signal=signals.pre_delete)