merlimat commented on a change in pull request #548: PIP-1 - Introduce Pulsar proxy component URL: https://github.com/apache/incubator-pulsar/pull/548#discussion_r126543382
########## File path: pulsar-proxy/src/main/java/org/apache/pulsar/proxy/server/DirectProxyHandler.java ########## @@ -0,0 +1,181 @@ +/** + * 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.pulsar.proxy.server; + +import java.net.URI; +import java.net.URISyntaxException; + +import org.apache.pulsar.client.api.Authentication; +import org.apache.pulsar.common.api.Commands; +import org.apache.pulsar.common.api.PulsarDecoder; +import org.apache.pulsar.common.api.PulsarLengthFieldFrameDecoder; +import org.apache.pulsar.common.api.proto.PulsarApi.CommandConnected; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import io.netty.bootstrap.Bootstrap; +import io.netty.buffer.PooledByteBufAllocator; +import io.netty.channel.Channel; +import io.netty.channel.ChannelFuture; +import io.netty.channel.ChannelHandlerContext; +import io.netty.channel.ChannelInitializer; +import io.netty.channel.ChannelOption; +import io.netty.channel.socket.SocketChannel; +import io.netty.util.concurrent.Future; +import io.netty.util.concurrent.FutureListener; + +public class DirectProxyHandler { + + private Channel inboundChannel; + Channel outboundChannel; + + private final Authentication authentication; + + public DirectProxyHandler(ProxyService service, ProxyConnection proxyConnection, String targetBrokerUrl) { + this.authentication = service.getClientAuthentication(); + this.inboundChannel = proxyConnection.ctx().channel(); + + // Start the connection attempt. + Bootstrap b = new Bootstrap(); + // Tie the backend connection on the same thread to avoid context switches when passing data between the 2 + // connections + b.option(ChannelOption.ALLOCATOR, PooledByteBufAllocator.DEFAULT); + b.group(inboundChannel.eventLoop()).channel(inboundChannel.getClass()).option(ChannelOption.AUTO_READ, false); + b.handler(new ChannelInitializer<SocketChannel>() { + @Override + protected void initChannel(SocketChannel ch) throws Exception { + ch.pipeline().addLast("frameDecoder", + new PulsarLengthFieldFrameDecoder(PulsarDecoder.MaxFrameSize, 0, 4, 0, 4)); + ch.pipeline().addLast(new ProxyBackendHandler()); + } + }); + + URI targetBroker; + try { + // targetBrokerUrl is coming in the "hostname:6650" form, so we need to extract host and port + targetBroker = new URI("pulsar://" + targetBrokerUrl); + } catch (URISyntaxException e) { + log.warn("[{}] Failed to parse broker url '{}'", inboundChannel, targetBrokerUrl, e); + inboundChannel.close(); + return; + } + + ChannelFuture f = b.connect(targetBroker.getHost(), targetBroker.getPort()); + outboundChannel = f.channel(); + f.addListener(future -> { + if (!future.isSuccess()) { + // Close the connection if the connection attempt has failed. + inboundChannel.close(); + } + }); + } + + enum BackendState { + Init, HandshakeCompleted + } + + public class ProxyBackendHandler extends PulsarDecoder implements FutureListener<Void> { + + private BackendState state = BackendState.Init; + + @Override + public void channelActive(ChannelHandlerContext ctx) throws Exception { + // Send the Connect command to broker + String authData = ""; + if (authentication.getAuthData().hasDataFromCommand()) { + authData = authentication.getAuthData().getCommandData(); + } + outboundChannel + .writeAndFlush(Commands.newConnect(authentication.getAuthMethodName(), authData, "Pulsar proxy")); + outboundChannel.read(); + } + + @Override + public void channelRead(final ChannelHandlerContext ctx, Object msg) throws Exception { + switch (state) { + case Init: + if (log.isDebugEnabled()) { + log.debug("[{}] [{}] Received msg on broker connection: {}", inboundChannel, outboundChannel, + msg.getClass()); + } + + // Do the regular decoding for the Connected message + super.channelRead(ctx, msg); + break; + + case HandshakeCompleted: + inboundChannel.writeAndFlush(msg).addListener(this); + break; + + default: + break; + } + + } + + @Override + public void operationComplete(Future<Void> future) throws Exception { + // This is invoked when the write operation on the paired connection is completed + if (future.isSuccess()) { + outboundChannel.read(); + } else { + inboundChannel.close(); Review comment: Fixed ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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