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https://issues.apache.org/jira/browse/FLINK-9386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16487263#comment-16487263
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ASF GitHub Bot commented on FLINK-9386:
---------------------------------------
Github user uce commented on a diff in the pull request:
https://github.com/apache/flink/pull/6031#discussion_r190191066
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/rest/handler/router/RouterHandler.java
---
@@ -0,0 +1,109 @@
+/*
+ * 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.flink.runtime.rest.handler.router;
+
+import org.apache.flink.runtime.rest.handler.AbstractRestHandler;
+import org.apache.flink.runtime.rest.handler.util.HandlerUtils;
+import org.apache.flink.runtime.rest.messages.ErrorResponseBody;
+
+import org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandler;
+import
org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandlerContext;
+import
org.apache.flink.shaded.netty4.io.netty.channel.ChannelInboundHandler;
+import org.apache.flink.shaded.netty4.io.netty.channel.ChannelPipeline;
+import
org.apache.flink.shaded.netty4.io.netty.channel.SimpleChannelInboundHandler;
+import
org.apache.flink.shaded.netty4.io.netty.handler.codec.http.DefaultFullHttpResponse;
+import
org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpHeaders;
+import
org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpMethod;
+import
org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpRequest;
+import
org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpResponseStatus;
+import
org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpVersion;
+import
org.apache.flink.shaded.netty4.io.netty.handler.codec.http.QueryStringDecoder;
+
+import java.util.Map;
+
+import static java.util.Objects.requireNonNull;
+
+/**
+ * This class replaces the standard error response to be identical with
those sent by the {@link AbstractRestHandler}.
+ */
+public class RouterHandler extends
SimpleChannelInboundHandler<HttpRequest> {
--- End diff --
I've verified that this class merges the behaviour of `Handler` and
`AbstractHandler`. 👍
Since we copied the code, we might leave it as is, but I noticed the
following minor things (there are similar warnings in the other copied classes):
- `L46`, `L47`: fields can be private
- `L62`: `throws Exception` can be removed
- `L98`: I get a unchecked call warning for `RouteResult`. We could use
`<?>` to get rid of it I think
> Remove netty-router dependency
> ------------------------------
>
> Key: FLINK-9386
> URL: https://issues.apache.org/jira/browse/FLINK-9386
> Project: Flink
> Issue Type: Sub-task
> Reporter: Piotr Nowojski
> Assignee: Piotr Nowojski
> Priority: Major
> Fix For: 1.6.0
>
>
> netty-router 1.10 blocks upgrade to 4.1, while netty-router 2.2.0 has broken
> compatibility in a way that it's unusable by us (it doesn't allow to sort
> router paths as in https://issues.apache.org/jira/browse/FLINK-8000 ). I
> propose to copy & simplify & modify netty-router code to suite our needs.
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