[
https://issues.apache.org/jira/browse/FLINK-7040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16136772#comment-16136772
]
ASF GitHub Bot commented on FLINK-7040:
---------------------------------------
Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/4569#discussion_r134474895
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/rest/handler/AbstractRestHandler.java
---
@@ -0,0 +1,201 @@
+/*
+ * 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;
+
+import org.apache.flink.configuration.ConfigConstants;
+import org.apache.flink.runtime.concurrent.FutureUtils;
+import org.apache.flink.runtime.rest.HttpMethodWrapper;
+import org.apache.flink.runtime.rest.messages.ErrorResponseBody;
+import org.apache.flink.runtime.rest.messages.MessageHeaders;
+import org.apache.flink.runtime.rest.messages.RequestBody;
+import org.apache.flink.runtime.rest.messages.ResponseBody;
+import org.apache.flink.runtime.rest.util.RestMapperUtils;
+
+import org.apache.flink.shaded.netty4.io.netty.buffer.ByteBuf;
+import org.apache.flink.shaded.netty4.io.netty.buffer.ByteBufInputStream;
+import org.apache.flink.shaded.netty4.io.netty.buffer.Unpooled;
+import org.apache.flink.shaded.netty4.io.netty.channel.ChannelFuture;
+import
org.apache.flink.shaded.netty4.io.netty.channel.ChannelFutureListener;
+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.SimpleChannelInboundHandler;
+import
org.apache.flink.shaded.netty4.io.netty.handler.codec.http.DefaultHttpResponse;
+import
org.apache.flink.shaded.netty4.io.netty.handler.codec.http.FullHttpRequest;
+import
org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpHeaders;
+import
org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpRequest;
+import
org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpResponse;
+import
org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpResponseStatus;
+import
org.apache.flink.shaded.netty4.io.netty.handler.codec.http.LastHttpContent;
+import
org.apache.flink.shaded.netty4.io.netty.handler.codec.http.router.Routed;
+
+import com.fasterxml.jackson.core.JsonParseException;
+import com.fasterxml.jackson.databind.JsonMappingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.annotation.Nonnull;
+
+import java.io.IOException;
+import java.io.StringWriter;
+import java.util.concurrent.CompletableFuture;
+
+import static
org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpHeaders.Names.CONNECTION;
+import static
org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpHeaders.Names.CONTENT_TYPE;
+import static
org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpVersion.HTTP_1_1;
+
+/**
+ * Super class for netty-based handlers that work with {@link
RequestBody}s and {@link ResponseBody}s.
+ *
+ * <p>Subclasses must be thread-safe.
+ *
+ * @param <R> type of incoming requests
+ * @param <P> type of outgoing responses
+ */
+@ChannelHandler.Sharable
+public abstract class AbstractRestHandler<R extends RequestBody, P extends
ResponseBody> extends SimpleChannelInboundHandler<Routed> {
+ protected final Logger log = LoggerFactory.getLogger(getClass());
+
+ private static final ObjectMapper mapper =
RestMapperUtils.getStrictObjectMapper();
+
+ private final MessageHeaders<R, P, ?> messageHeaders;
+
+ protected AbstractRestHandler(MessageHeaders<R, P, ?> messageHeaders) {
+ this.messageHeaders = messageHeaders;
+ }
+
+ public MessageHeaders<R, P, ?> getMessageHeaders() {
+ return messageHeaders;
+ }
+
+ @Override
+ protected void channelRead0(final ChannelHandlerContext ctx, Routed
routed) throws Exception {
+ log.debug("Received request.");
+ final HttpRequest httpRequest = routed.request();
+
+ try {
+ if (!(httpRequest instanceof FullHttpRequest)) {
+ log.error("Implementation error: Received a
request that wasn't a FullHttpResponse.");
--- End diff --
Alright. Please add a comment explaining this.
> Flip-6 client-cluster communication
> -----------------------------------
>
> Key: FLINK-7040
> URL: https://issues.apache.org/jira/browse/FLINK-7040
> Project: Flink
> Issue Type: New Feature
> Components: Cluster Management, Mesos
> Reporter: Till Rohrmann
> Assignee: Chesnay Schepler
> Priority: Critical
> Labels: flip-6
>
> With the new Flip-6 architecture, the client will communicate with the
> cluster in a RESTful manner.
> The cluster shall support the following REST calls:
> * List jobs (GET): Get list of all running jobs on the cluster
> * Submit job (POST): Submit a job to the cluster (only supported in session
> mode)
> * Lookup job leader (GET): Gets the JM leader for the given job
> * Get job status (GET): Get the status of an executed job (and maybe the
> JobExecutionResult)
> * Cancel job (PUT): Cancel the given job
> * Stop job (PUT): Stops the given job
> * Take savepoint (POST): Take savepoint for given job (How to return the
> savepoint under which the savepoint was stored? Maybe always having to
> specify a path)
> * Get KV state (GET): Gets the KV state for the given job and key (Queryable
> state)
> * Poll/subscribe to notifications for job (GET, WebSocket): Polls new
> notifications from the execution of the given job/Opens WebSocket to receive
> notifications
> The first four REST calls will be served by the REST endpoint running in the
> application master/cluster entrypoint. The other calls will be served by a
> REST endpoint running along side to the JobManager.
> Detailed information about different implementations and their pros and cons
> can be found in this document:
> https://docs.google.com/document/d/1eIX6FS9stwraRdSUgRSuLXC1sL7NAmxtuqIXe_jSi-k/edit?usp=sharing
> The implementation will most likely be Netty based.
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