Fixed #3012 -- Changed the locmem cache backend to use pickle instead of deepcopy to make it compatible with iterators (which cannot be copied). Patch from Sundance.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@5703 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/core/cache/backends/locmem.py

@@ -2,7 +2,11 @@
 
 from django.core.cache.backends.simple import CacheClass as SimpleCacheClass
 from django.utils.synch import RWLock
-import copy, time
+import time
+try:
+    import cPickle as pickle
+except ImportError:
+    import pickle
 
 class CacheClass(SimpleCacheClass):
     def __init__(self, host, params):
@@ -20,7 +24,10 @@ class CacheClass(SimpleCacheClass):
             elif exp < now:
                 should_delete = True
             else:
-                return copy.deepcopy(self._cache[key])
+                try:
+                    return pickle.loads(self._cache[key])
+                except pickle.PickleError:
+                    return default
         finally:
             self._lock.reader_leaves()
         if should_delete:
@@ -35,7 +42,10 @@ class CacheClass(SimpleCacheClass):
     def set(self, key, value, timeout=None):
         self._lock.writer_enters()
         try:
-            SimpleCacheClass.set(self, key, value, timeout)
+            try:
+                super(CacheClass, self).set(key, pickle.dumps(value), timeout)
+            except pickle.PickleError:
+                pass
         finally:
             self._lock.writer_leaves()