Java tutorial
/* * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. * * Copyright (c) 2016 Oracle and/or its affiliates. All rights reserved. * * The contents of this file are subject to the terms of either the GNU * General Public License Version 2 only ("GPL") or the Common Development * and Distribution License("CDDL") (collectively, the "License"). You * may not use this file except in compliance with the License. You can * obtain a copy of the License at * http://glassfish.java.net/public/CDDL+GPL_1_1.html * or packager/legal/LICENSE.txt. See the License for the specific * language governing permissions and limitations under the License. * * When distributing the software, include this License Header Notice in each * file and include the License file at packager/legal/LICENSE.txt. * * GPL Classpath Exception: * Oracle designates this particular file as subject to the "Classpath" * exception as provided by Oracle in the GPL Version 2 section of the License * file that accompanied this code. * * Modifications: * If applicable, add the following below the License Header, with the fields * enclosed by brackets [] replaced by your own identifying information: * "Portions Copyright [year] [name of copyright owner]" * * Contributor(s): * If you wish your version of this file to be governed by only the CDDL or * only the GPL Version 2, indicate your decision by adding "[Contributor] * elects to include this software in this distribution under the [CDDL or GPL * Version 2] license." 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However, if you add GPL Version 2 code * and therefore, elected the GPL Version 2 license, then the option applies * only if the new code is made subject to such option by the copyright * holder. */ package org.glassfish.jersey.netty.connector; import java.io.IOException; import java.io.OutputStream; import java.net.InetSocketAddress; import java.net.URI; import java.util.List; import java.util.Map; import java.util.concurrent.CompletableFuture; import java.util.concurrent.ExecutionException; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import java.util.concurrent.Future; import java.util.concurrent.TimeUnit; import java.util.concurrent.atomic.AtomicReference; import javax.ws.rs.ProcessingException; import javax.ws.rs.client.Client; import javax.ws.rs.core.Configuration; import io.netty.bootstrap.Bootstrap; import io.netty.channel.Channel; import io.netty.channel.ChannelInitializer; import io.netty.channel.ChannelOption; import io.netty.channel.ChannelPipeline; import io.netty.channel.EventLoopGroup; import io.netty.channel.nio.NioEventLoopGroup; import io.netty.channel.socket.SocketChannel; import io.netty.channel.socket.nio.NioSocketChannel; import io.netty.handler.codec.http.DefaultFullHttpRequest; import io.netty.handler.codec.http.DefaultHttpRequest; import io.netty.handler.codec.http.HttpChunkedInput; import io.netty.handler.codec.http.HttpClientCodec; import io.netty.handler.codec.http.HttpContentDecompressor; import io.netty.handler.codec.http.HttpHeaderNames; import io.netty.handler.codec.http.HttpMethod; import io.netty.handler.codec.http.HttpRequest; import io.netty.handler.codec.http.HttpUtil; import io.netty.handler.codec.http.HttpVersion; import io.netty.handler.proxy.HttpProxyHandler; import io.netty.handler.ssl.ClientAuth; import io.netty.handler.ssl.JdkSslContext; import io.netty.handler.stream.ChunkedWriteHandler; import io.netty.util.concurrent.GenericFutureListener; import org.glassfish.jersey.client.ClientProperties; import org.glassfish.jersey.client.ClientRequest; import org.glassfish.jersey.client.ClientResponse; import org.glassfish.jersey.client.spi.AsyncConnectorCallback; import org.glassfish.jersey.client.spi.Connector; import org.glassfish.jersey.message.internal.OutboundMessageContext; import org.glassfish.jersey.netty.connector.internal.JerseyChunkedInput; /** * Netty connector implementation. * * @author Pavel Bucek (pavel.bucek at oracle.com) */ class NettyConnector implements Connector { final ExecutorService executorService; final EventLoopGroup group; final Client client; NettyConnector(Client client) { final Object threadPoolSize = client.getConfiguration().getProperties() .get(ClientProperties.ASYNC_THREADPOOL_SIZE); if (threadPoolSize != null && threadPoolSize instanceof Integer && (Integer) threadPoolSize > 0) { executorService = Executors.newFixedThreadPool((Integer) threadPoolSize); } else { executorService = Executors.newCachedThreadPool(); } this.group = new NioEventLoopGroup(); this.client = client; } @Override public ClientResponse apply(ClientRequest jerseyRequest) { final AtomicReference<ClientResponse> syncResponse = new AtomicReference<>(null); final AtomicReference<Throwable> syncException = new AtomicReference<>(null); try { Future<?> resultFuture = apply(jerseyRequest, new AsyncConnectorCallback() { @Override public void response(ClientResponse response) { syncResponse.set(response); } @Override public void failure(Throwable failure) { syncException.set(failure); } }); Integer timeout = ClientProperties.getValue(jerseyRequest.getConfiguration().getProperties(), ClientProperties.READ_TIMEOUT, 0); if (timeout != null && timeout > 0) { resultFuture.get(timeout, TimeUnit.MILLISECONDS); } else { resultFuture.get(); } } catch (ExecutionException ex) { Throwable e = ex.getCause() == null ? ex : ex.getCause(); throw new ProcessingException(e.getMessage(), e); } catch (Exception ex) { throw new ProcessingException(ex.getMessage(), ex); } Throwable throwable = syncException.get(); if (throwable == null) { return syncResponse.get(); } else { throw new RuntimeException(throwable); } } @Override public Future<?> apply(final ClientRequest jerseyRequest, final AsyncConnectorCallback jerseyCallback) { final CompletableFuture<Object> settableFuture = new CompletableFuture<>(); final URI requestUri = jerseyRequest.getUri(); String host = requestUri.getHost(); int port = requestUri.getPort() != -1 ? requestUri.getPort() : "https".equals(requestUri.getScheme()) ? 443 : 80; try { Bootstrap b = new Bootstrap(); b.group(group).channel(NioSocketChannel.class).handler(new ChannelInitializer<SocketChannel>() { @Override protected void initChannel(SocketChannel ch) throws Exception { ChannelPipeline p = ch.pipeline(); // Enable HTTPS if necessary. if ("https".equals(requestUri.getScheme())) { // making client authentication optional for now; it could be extracted to configurable property JdkSslContext jdkSslContext = new JdkSslContext(client.getSslContext(), true, ClientAuth.NONE); p.addLast(jdkSslContext.newHandler(ch.alloc())); } // http proxy Configuration config = jerseyRequest.getConfiguration(); final Object proxyUri = config.getProperties().get(ClientProperties.PROXY_URI); if (proxyUri != null) { final URI u = getProxyUri(proxyUri); final String userName = ClientProperties.getValue(config.getProperties(), ClientProperties.PROXY_USERNAME, String.class); final String password = ClientProperties.getValue(config.getProperties(), ClientProperties.PROXY_PASSWORD, String.class); p.addLast(new HttpProxyHandler( new InetSocketAddress(u.getHost(), u.getPort() == -1 ? 8080 : u.getPort()), userName, password)); } p.addLast(new HttpClientCodec()); p.addLast(new ChunkedWriteHandler()); p.addLast(new HttpContentDecompressor()); p.addLast(new JerseyClientHandler(NettyConnector.this, jerseyRequest, jerseyCallback, settableFuture)); } }); // connect timeout Integer connectTimeout = ClientProperties.getValue(jerseyRequest.getConfiguration().getProperties(), ClientProperties.CONNECT_TIMEOUT, 0); if (connectTimeout > 0) { b.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, connectTimeout); } // Make the connection attempt. final Channel ch = b.connect(host, port).sync().channel(); // guard against prematurely closed channel final GenericFutureListener<io.netty.util.concurrent.Future<? super Void>> closeListener = new GenericFutureListener<io.netty.util.concurrent.Future<? super Void>>() { @Override public void operationComplete(io.netty.util.concurrent.Future<? super Void> future) throws Exception { if (!settableFuture.isDone()) { settableFuture.completeExceptionally(new IOException("Channel closed.")); } } }; ch.closeFuture().addListener(closeListener); HttpRequest nettyRequest; if (jerseyRequest.hasEntity()) { nettyRequest = new DefaultHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.valueOf(jerseyRequest.getMethod()), requestUri.getRawPath()); } else { nettyRequest = new DefaultFullHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.valueOf(jerseyRequest.getMethod()), requestUri.getRawPath()); } // headers for (final Map.Entry<String, List<String>> e : jerseyRequest.getStringHeaders().entrySet()) { nettyRequest.headers().add(e.getKey(), e.getValue()); } // host header - http 1.1 nettyRequest.headers().add(HttpHeaderNames.HOST, jerseyRequest.getUri().getHost()); if (jerseyRequest.hasEntity()) { if (jerseyRequest.getLengthLong() == -1) { HttpUtil.setTransferEncodingChunked(nettyRequest, true); } else { nettyRequest.headers().add(HttpHeaderNames.CONTENT_LENGTH, jerseyRequest.getLengthLong()); } } if (jerseyRequest.hasEntity()) { // Send the HTTP request. ch.writeAndFlush(nettyRequest); final JerseyChunkedInput jerseyChunkedInput = new JerseyChunkedInput(ch); jerseyRequest.setStreamProvider(new OutboundMessageContext.StreamProvider() { @Override public OutputStream getOutputStream(int contentLength) throws IOException { return jerseyChunkedInput; } }); if (HttpUtil.isTransferEncodingChunked(nettyRequest)) { ch.write(new HttpChunkedInput(jerseyChunkedInput)); } else { ch.write(jerseyChunkedInput); } executorService.execute(new Runnable() { @Override public void run() { // close listener is not needed any more. ch.closeFuture().removeListener(closeListener); try { jerseyRequest.writeEntity(); } catch (IOException e) { jerseyCallback.failure(e); settableFuture.completeExceptionally(e); } } }); ch.flush(); } else { // close listener is not needed any more. ch.closeFuture().removeListener(closeListener); // Send the HTTP request. ch.writeAndFlush(nettyRequest); } } catch (InterruptedException e) { settableFuture.completeExceptionally(e); return settableFuture; } return settableFuture; } @Override public String getName() { return "Netty 4.1.x"; } @Override public void close() { group.shutdownGracefully(); executorService.shutdown(); } @SuppressWarnings("ChainOfInstanceofChecks") private static URI getProxyUri(final Object proxy) { if (proxy instanceof URI) { return (URI) proxy; } else if (proxy instanceof String) { return URI.create((String) proxy); } else { throw new ProcessingException(LocalizationMessages.WRONG_PROXY_URI_TYPE(ClientProperties.PROXY_URI)); } } }