make SlaveOf[Async] public on IServer

StackExchange.Redis/StackExchange/Redis/IServer.cs

@@ -297,6 +297,17 @@ public partial interface IServer : IRedis
         /// <remarks>http://redis.io/commands/shutdown</remarks>
         void Shutdown(ShutdownMode shutdownMode = ShutdownMode.Default, CommandFlags flags = CommandFlags.None);
 
+        /// <summary>
+        /// The SLAVEOF command can change the replication settings of a slave on the fly. If a Redis server is already acting as slave, specifying a null master will turn off the replication, turning the Redis server into a MASTER. Specifying a non-null master will make the server a slave of another server listening at the specified hostname and port.
+        /// </summary>
+        /// <remarks>http://redis.io/commands/slaveof</remarks>
+        void SlaveOf(EndPoint master, CommandFlags flags = CommandFlags.None);
+        /// <summary>
+        /// The SLAVEOF command can change the replication settings of a slave on the fly. If a Redis server is already acting as slave, specifying a null master will turn off the replication, turning the Redis server into a MASTER. Specifying a non-null master will make the server a slave of another server listening at the specified hostname and port.
+        /// </summary>
+        /// <remarks>http://redis.io/commands/slaveof</remarks>
+        Task SlaveOfAsync(EndPoint master, CommandFlags flags = CommandFlags.None);
+
         /// <summary>
         /// To read the slow log the SLOWLOG GET command is used, that returns every entry in the slow log. It is possible to return only the N most recent entries passing an additional argument to the command (for instance SLOWLOG GET 10).
         /// </summary>

StackExchange.Redis/StackExchange/Redis/RedisServer.cs

@@ -496,7 +496,7 @@ internal override RedisFeatures GetFeatures(int db, RedisKey key, CommandFlags f
             return new RedisFeatures(server.Version);
         }
 
-        internal void SlaveOf(EndPoint endpoint, CommandFlags flags = CommandFlags.None)
+        public void SlaveOf(EndPoint endpoint, CommandFlags flags = CommandFlags.None)
         {
             var msg = CreateSlaveOfMessage(endpoint, flags);
             if (endpoint == server.EndPoint)
@@ -506,6 +506,16 @@ internal void SlaveOf(EndPoint endpoint, CommandFlags flags = CommandFlags.None)
             ExecuteSync(msg, ResultProcessor.DemandOK);
         }
 
+        public Task SlaveOfAsync(EndPoint endpoint, CommandFlags flags = CommandFlags.None)
+        {
+            var msg = CreateSlaveOfMessage(endpoint, flags);
+            if (endpoint == server.EndPoint)
+            {
+                throw new ArgumentException("Cannot slave to self");
+            }
+            return ExecuteAsync(msg, ResultProcessor.DemandOK);
+        }
+
         private void FixFlags(Message message, ServerEndPoint server)
         {
             // since the server is specified explicitly, we don't want defaults