Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/4569#discussion_r134506551
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/rest/RestClientEndpoint.java
---
@@ -0,0 +1,263 @@
+/*
+ * 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;
+
+import org.apache.flink.configuration.ConfigConstants;
+import org.apache.flink.runtime.concurrent.Executors;
+import org.apache.flink.runtime.concurrent.FutureUtils;
+import org.apache.flink.runtime.rest.handler.PipelineErrorHandler;
+import org.apache.flink.runtime.rest.messages.ErrorResponseBody;
+import org.apache.flink.runtime.rest.messages.MessageHeaders;
+import org.apache.flink.runtime.rest.messages.ParameterMapper;
+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.util.Preconditions;
+
+import org.apache.flink.shaded.netty4.io.netty.bootstrap.Bootstrap;
+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.Channel;
+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.ChannelInitializer;
+import
org.apache.flink.shaded.netty4.io.netty.channel.SimpleChannelInboundHandler;
+import
org.apache.flink.shaded.netty4.io.netty.channel.nio.NioEventLoopGroup;
+import
org.apache.flink.shaded.netty4.io.netty.channel.socket.SocketChannel;
+import
org.apache.flink.shaded.netty4.io.netty.channel.socket.nio.NioSocketChannel;
+import
org.apache.flink.shaded.netty4.io.netty.handler.codec.http.DefaultFullHttpRequest;
+import
org.apache.flink.shaded.netty4.io.netty.handler.codec.http.FullHttpRequest;
+import
org.apache.flink.shaded.netty4.io.netty.handler.codec.http.FullHttpResponse;
+import
org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpClientCodec;
+import
org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpHeaders;
+import
org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpObjectAggregator;
+import
org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpVersion;
+import org.apache.flink.shaded.netty4.io.netty.handler.ssl.SslHandler;
+
+import com.fasterxml.jackson.core.JsonParseException;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.JsonMappingException;
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.net.ssl.SSLEngine;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.StringWriter;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.Executor;
+
+/**
+ * This client is the counter-part to the {@link RestServerEndpoint}.
+ */
+public class RestClientEndpoint {
+ private static final Logger LOG =
LoggerFactory.getLogger(RestClientEndpoint.class);
+
+ private static final ObjectMapper objectMapper =
RestMapperUtils.getStrictObjectMapper();
+
+ private final String configuredTargetAddress;
+ private final int configuredTargetPort;
+ private final SSLEngine sslEngine;
+
+ private Bootstrap bootstrap;
+
+ private final ClientHandler handler = new ClientHandler();
+
+ private CompletableFuture<?> lastFuture =
CompletableFuture.completedFuture(null);
+
+ private final Executor directExecutor = Executors.directExecutor();
+
+ public RestClientEndpoint(RestClientEndpointConfiguration
configuration) {
+ this.configuredTargetAddress =
configuration.getTargetRestEndpointAddress();
+ this.configuredTargetPort =
configuration.getTargetRestEndpointPort();
+ this.sslEngine = configuration.getSslEngine();
+ }
+
+ public void start() {
+ ChannelInitializer<SocketChannel> initializer = new
ChannelInitializer<SocketChannel>() {
+
+ @Override
+ protected void initChannel(SocketChannel ch) {
+
+ // SSL should be the first handler in the
pipeline
+ if (sslEngine != null) {
+ ch.pipeline().addLast("ssl", new
SslHandler(sslEngine));
+ }
+
+ ch.pipeline()
+ .addLast(new HttpClientCodec())
+ .addLast(new HttpObjectAggregator(1024
* 1024))
+ .addLast(handler)
+ .addLast(new PipelineErrorHandler(LOG));
+ }
+ };
+
+ NioEventLoopGroup group = new NioEventLoopGroup(1);
+
+ bootstrap = new Bootstrap();
+ bootstrap
+ .group(group)
+ .channel(NioSocketChannel.class)
+ .handler(initializer);
+
+ LOG.info("Rest client endpoint started.");
--- End diff --
I actually think it is a better design to do it in the constructor. That
way we don't have the additional call to `start` which is necessary in the
`RestServerEndpoint` case because of the `initializeHandlers` methods.
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