Cache: getset() and incrby() added

redis_cache/backends/base.py

@@ -546,3 +546,19 @@ class BaseRedisCache(BaseCache):
     def has_fresh_key(self, client, key):
         """Returns True if the fresh key is in the cache and has not expired."""
         return client.exists("__fresh__" + key)
+
+    @get_client(write=True)
+    def getset(self, client, key, value):
+        """
+        Sets the value at key ``name`` to ``value``
+        and returns the old value at key ``name`` atomically.
+        """
+        return client.getset(key, value)
+
+    @get_client(write=True)
+    def incrby(self, client, key, amount=1):
+        """
+        Increments the value of ``key`` by ``amount``.  If no key exists,
+        the value will be initialized as ``amount``
+        """
+        return client.incrby(key, amount=1)