summaryrefslogtreecommitdiff
path: root/main/middleware.py
diff options
context:
space:
mode:
Diffstat (limited to 'main/middleware.py')
-rw-r--r--main/middleware.py52
1 files changed, 52 insertions, 0 deletions
diff --git a/main/middleware.py b/main/middleware.py
index db2c1104..4d343b41 100644
--- a/main/middleware.py
+++ b/main/middleware.py
@@ -14,3 +14,55 @@ def get_user():
'''Get the currently logged in request.user'''
return user_holder.user
+# begin copy of stock Django UpdateCacheMiddleware
+# this is to address feeds caching issue which makes it horribly
+# unperformant
+
+from django.conf import settings
+from django.core.cache import cache
+from django.utils.cache import get_cache_key, learn_cache_key, patch_response_headers, get_max_age
+
+class UpdateCacheMiddleware(object):
+ """
+ Response-phase cache middleware that updates the cache if the response is
+ cacheable.
+
+ Must be used as part of the two-part update/fetch cache middleware.
+ UpdateCacheMiddleware must be the first piece of middleware in
+ MIDDLEWARE_CLASSES so that it'll get called last during the response phase.
+ """
+ def __init__(self):
+ self.cache_timeout = settings.CACHE_MIDDLEWARE_SECONDS
+ self.key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
+ self.cache_anonymous_only = getattr(settings, 'CACHE_MIDDLEWARE_ANONYMOUS_ONLY', False)
+
+ def process_response(self, request, response):
+ """Sets the cache, if needed."""
+ if not hasattr(request, '_cache_update_cache') or not request._cache_update_cache:
+ # We don't need to update the cache, just return.
+ return response
+ if request.method != 'GET':
+ # This is a stronger requirement than above. It is needed
+ # because of interactions between this middleware and the
+ # HTTPMiddleware, which throws the body of a HEAD-request
+ # away before this middleware gets a chance to cache it.
+ return response
+ if not response.status_code == 200:
+ return response
+ # Try to get the timeout from the "max-age" section of the "Cache-
+ # Control" header before reverting to using the default cache_timeout
+ # length.
+ timeout = get_max_age(response)
+ if timeout == None:
+ timeout = self.cache_timeout
+ elif timeout == 0:
+ # max-age was set to 0, don't bother caching.
+ return response
+ patch_response_headers(response, timeout)
+ if timeout:
+ response.content = response.content
+ cache_key = learn_cache_key(request, response, timeout, self.key_prefix)
+ cache.set(cache_key, response, timeout)
+ return response
+
+# vim: set ts=4 sw=4 et: