Refactor caching logic

gallery/cache.py

@@ -0,0 +1,9 @@
+from django.core.cache import cache
+
+
+def cached_or_set(key, timeout, func):
+    value = cache.get(key)
+    if value is None:
+        value = func()
+        cache.set(key, value, timeout)
+    return value