fix the bug: the channel will not closed in time when timeout by using telnet in QOS

dubbo-plugin/dubbo-qos/src/main/java/org/apache/dubbo/qos/server/handler/QosProcessHandler.java

@@ -90,6 +90,7 @@ protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) t
             p.addLast(new StringDecoder(CharsetUtil.UTF_8));
             p.addLast(new StringEncoder(CharsetUtil.UTF_8));
             p.addLast(new IdleStateHandler(0, 0, 5 * 60));
+            p.addLast(new TelnetIdleEventHandler());
             p.addLast(new TelnetProcessHandler());
             p.remove(this);
         }

dubbo-plugin/dubbo-qos/src/main/java/org/apache/dubbo/qos/server/handler/TelnetIdleEventHandler.java

@@ -0,0 +1,41 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.dubbo.qos.server.handler;
+
+import io.netty.channel.Channel;
+import io.netty.channel.ChannelDuplexHandler;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.handler.timeout.IdleStateEvent;
+import org.apache.dubbo.common.logger.Logger;
+import org.apache.dubbo.common.logger.LoggerFactory;
+
+public class TelnetIdleEventHandler extends ChannelDuplexHandler {
+    private static final Logger log = LoggerFactory.getLogger(TelnetIdleEventHandler.class);
+
+    @Override
+    public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
+        // server will close channel when server don't receive any request from client util timeout.
+        if (evt instanceof IdleStateEvent) {
+            Channel channel = ctx.channel();
+            log.info("IdleStateEvent triggered, close channel " + channel);
+            channel.close();
+        } else {
+            super.userEventTriggered(ctx, evt);
+        }
+    }
+
+}