/*
    * Copyright 2020 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.haproxy;
  
  import io.netty.bootstrap.ServerBootstrap;
  import io.netty.buffer.ByteBuf;
  import io.netty.buffer.ByteBufUtil;
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.channel.ChannelInitializer;
  import io.netty.channel.EventLoopGroup;
  import io.netty.channel.SimpleChannelInboundHandler;
  import io.netty.channel.nio.NioEventLoopGroup;
  import io.netty.channel.socket.SocketChannel;
  import io.netty.channel.socket.nio.NioServerSocketChannel;
  import io.netty.handler.codec.haproxy.HAProxyMessage;
  import io.netty.handler.codec.haproxy.HAProxyMessageDecoder;
  import io.netty.handler.logging.LogLevel;
  import io.netty.handler.logging.LoggingHandler;
  
  public final class HAProxyServer {
  
      static final int PORT = Integer.parseInt(System.getProperty("port", "8080"));
  
      public static void main(String[] args) throws Exception {
          EventLoopGroup bossGroup = new NioEventLoopGroup(1);
          EventLoopGroup workerGroup = new NioEventLoopGroup();
          try {
              ServerBootstrap b = new ServerBootstrap();
              b.group(bossGroup, workerGroup)
               .channel(NioServerSocketChannel.class)
               .handler(new LoggingHandler(LogLevel.INFO))
               .childHandler(new HAProxyServerInitializer());
              b.bind(PORT).sync().channel().closeFuture().sync();
          } finally {
              bossGroup.shutdownGracefully();
              workerGroup.shutdownGracefully();
          }
      }
  
      static class HAProxyServerInitializer extends ChannelInitializer<SocketChannel> {
          @Override
          public void initChannel(SocketChannel ch) throws Exception {
              ch.pipeline().addLast(
                      new LoggingHandler(LogLevel.DEBUG),
                      new HAProxyMessageDecoder(),
                      new SimpleChannelInboundHandler() {
                          @Override
                          protected void channelRead0(ChannelHandlerContext ctx, Object msg) throws Exception {
                              if (msg instanceof HAProxyMessage) {
                                  System.out.println("proxy message: " + msg);
                              } else if (msg instanceof ByteBuf) {
                                  System.out.println("bytebuf message: " + ByteBufUtil.prettyHexDump((ByteBuf) msg));
                              }
                          }
                      });
          }
      }
  }