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: