/*
    * Copyright 2014 The Netty Project
    *
    * The Netty Project 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:
    *
    *   https://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 io.netty.example.spdy.client;
  
  import io.netty.bootstrap.Bootstrap;
  import io.netty.buffer.Unpooled;
  import io.netty.channel.Channel;
  import io.netty.channel.ChannelOption;
  import io.netty.channel.EventLoopGroup;
  import io.netty.channel.nio.NioEventLoopGroup;
  import io.netty.channel.socket.nio.NioSocketChannel;
  import io.netty.handler.codec.http.DefaultFullHttpRequest;
  import io.netty.handler.codec.http.HttpHeaderNames;
  import io.netty.handler.codec.http.HttpHeaderValues;
  import io.netty.handler.codec.http.HttpMethod;
  import io.netty.handler.codec.http.HttpRequest;
  import io.netty.handler.codec.http.HttpVersion;
  import io.netty.handler.ssl.ApplicationProtocolConfig;
  import io.netty.handler.ssl.ApplicationProtocolConfig.Protocol;
  import io.netty.handler.ssl.ApplicationProtocolConfig.SelectedListenerFailureBehavior;
  import io.netty.handler.ssl.ApplicationProtocolConfig.SelectorFailureBehavior;
  import io.netty.handler.ssl.ApplicationProtocolNames;
  import io.netty.handler.ssl.SslContext;
  import io.netty.handler.ssl.SslContextBuilder;
  import io.netty.handler.ssl.util.InsecureTrustManagerFactory;
  
  /**
   * An SPDY client that allows you to send HTTP GET to a SPDY server.
   * <p>
   * This class must be run with the JVM parameter: {@code java -Xbootclasspath/p:<path_to_npn_boot_jar> ...}. The
   * "path_to_npn_boot_jar" is the path on the file system for the NPN Boot Jar file which can be downloaded from Maven at
   * coordinates org.mortbay.jetty.npn:npn-boot. Different versions applies to different OpenJDK versions. See
   * <a href="https://www.eclipse.org/jetty/documentation/current/npn-chapter.html">Jetty docs</a> for more information.
   * <p>
   * You may also use the {@code run-example.sh} script to start the client from the command line:
   * <pre>
   *     ./run-example.sh spdy-client
   * </pre>
   */
  public final class SpdyClient {
  
      static final String HOST = System.getProperty("host", "127.0.0.1");
      static final int PORT = Integer.parseInt(System.getProperty("port", "8443"));
  
      public static void main(String[] args) throws Exception {
          // Configure SSL.
          final SslContext sslCtx = SslContextBuilder.forClient()
              .trustManager(InsecureTrustManagerFactory.INSTANCE)
              .applicationProtocolConfig(new ApplicationProtocolConfig(
                          Protocol.NPN,
                          // NO_ADVERTISE is currently the only mode supported by both OpenSsl and JDK providers.
                          SelectorFailureBehavior.NO_ADVERTISE,
                          // ACCEPT is currently the only mode supported by both OpenSsl and JDK providers.
                          SelectedListenerFailureBehavior.ACCEPT,
                          ApplicationProtocolNames.SPDY_3_1,
                          ApplicationProtocolNames.HTTP_1_1))
              .build();
  
          HttpResponseClientHandler httpResponseHandler = new HttpResponseClientHandler();
          EventLoopGroup workerGroup = new NioEventLoopGroup();
  
          try {
              Bootstrap b = new Bootstrap();
              b.group(workerGroup);
              b.channel(NioSocketChannel.class);
              b.option(ChannelOption.SO_KEEPALIVE, true);
              b.remoteAddress(HOST, PORT);
              b.handler(new SpdyClientInitializer(sslCtx, httpResponseHandler));
  
              // Start the client.
              Channel channel = b.connect().syncUninterruptibly().channel();
              System.out.println("Connected to " + HOST + ':' + PORT);
  
              // Create a GET request.
              HttpRequest request = new DefaultFullHttpRequest(
                      HttpVersion.HTTP_1_1, HttpMethod.GET, "", Unpooled.EMPTY_BUFFER);
              request.headers().set(HttpHeaderNames.HOST, HOST);
              request.headers().set(HttpHeaderNames.ACCEPT_ENCODING, HttpHeaderValues.GZIP);
  
              // Send the GET request.
              channel.writeAndFlush(request).sync();
  
              // Waits for the complete HTTP response
              httpResponseHandler.queue().take().sync();
              System.out.println("Finished SPDY HTTP GET");
  
             // Wait until the connection is closed.
             channel.close().syncUninterruptibly();
         } finally {
             workerGroup.shutdownGracefully();
         }
     }
 }