touch_pattern added, include __fresh__ -prefixed keys to delete_pattern

redis_cache/backends/base.py

@@ -403,7 +403,10 @@ class BaseRedisCache(BaseCache):
     def _delete_pattern(self, client, pattern):
         keys = list(client.scan_iter(match=pattern))
         if keys:
-            client.delete(*keys)
+            all_keys = keys.copy()
+            for key in keys:
+                all_keys.append("__fresh__" + key)
+            client.delete(*all_keys)
 
     def delete_pattern(self, pattern, version=None):
         raise NotImplementedError
@@ -522,3 +525,9 @@ class BaseRedisCache(BaseCache):
                 lock.release()
 
         return acquired
+
+    @get_client()
+    def touch_pattern(self, client, pattern, timeout=DEFAULT_TIMEOUT, stale_cache_timeout=None):
+        keys = list(client.scan_iter(match=pattern))
+        for key in keys:
+            self.touch(key, timeout, stale_cache_timeout)