Merge pull request #218 from mgrouchy/ticket_18582

Fixed #18582 -- Added a no-op close to BaseCache

django/core/cache/__init__.py

@@ -134,11 +134,9 @@ def get_cache(backend, **kwargs):
             "Could not find backend '%s': %s" % (backend, e))
     cache = backend_cls(location, params)
     # Some caches -- python-memcached in particular -- need to do a cleanup at the
-    # end of a request cycle. If the cache provides a close() method, wire it up
-    # here.
-    if hasattr(cache, 'close'):
-        signals.request_finished.connect(cache.close)
+    # end of a request cycle. If not implemented in a particular backend
+    # cache.close is a no-op
+    signals.request_finished.connect(cache.close)
     return cache
 
 cache = get_cache(DEFAULT_CACHE_ALIAS)
-

django/core/cache/backends/base.py

@@ -6,15 +6,18 @@ import warnings
 from django.core.exceptions import ImproperlyConfigured, DjangoRuntimeWarning
 from django.utils.importlib import import_module
 
+
 class InvalidCacheBackendError(ImproperlyConfigured):
     pass
 
+
 class CacheKeyWarning(DjangoRuntimeWarning):
     pass
 
 # Memcached does not accept keys longer than this.
 MEMCACHE_MAX_KEY_LENGTH = 250
 
+
 def default_key_func(key, key_prefix, version):
     """
     Default function to generate keys.
@@ -25,6 +28,7 @@ def default_key_func(key, key_prefix, version):
     """
     return ':'.join([key_prefix, str(version), key])
 
+
 def get_key_func(key_func):
     """
     Function to decide which key function to use.
@@ -40,6 +44,7 @@ def get_key_func(key_func):
             return getattr(key_func_module, key_func_name)
     return default_key_func
 
+
 class BaseCache(object):
     def __init__(self, params):
         timeout = params.get('timeout', params.get('TIMEOUT', 300))
@@ -221,3 +226,7 @@ class BaseCache(object):
         the new version.
         """
         return self.incr_version(key, -delta, version)
+
+    def close(self, **kwargs):
+        """Close the cache connection"""
+        pass