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1   /*
2    * Copyright 2012 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package io.netty.example.file;
17  
18  import io.netty.bootstrap.ServerBootstrap;
19  import io.netty.channel.ChannelFuture;
20  import io.netty.channel.ChannelInitializer;
21  import io.netty.channel.ChannelOption;
22  import io.netty.channel.ChannelPipeline;
23  import io.netty.channel.EventLoopGroup;
24  import io.netty.channel.nio.NioEventLoopGroup;
25  import io.netty.channel.socket.SocketChannel;
26  import io.netty.channel.socket.nio.NioServerSocketChannel;
27  import io.netty.handler.codec.LineBasedFrameDecoder;
28  import io.netty.handler.codec.string.StringDecoder;
29  import io.netty.handler.codec.string.StringEncoder;
30  import io.netty.handler.logging.LogLevel;
31  import io.netty.handler.logging.LoggingHandler;
32  import io.netty.handler.ssl.SslContext;
33  import io.netty.handler.ssl.SslContextBuilder;
34  import io.netty.handler.ssl.util.SelfSignedCertificate;
35  import io.netty.handler.stream.ChunkedWriteHandler;
36  import io.netty.util.CharsetUtil;
37  
38  /**
39   * Server that accept the path of a file an echo back its content.
40   */
41  public final class FileServer {
42  
43      static final boolean SSL = System.getProperty("ssl") != null;
44      // Use the same default port with the telnet example so that we can use the telnet client example to access it.
45      static final int PORT = Integer.parseInt(System.getProperty("port", SSL? "8992" : "8023"));
46  
47      public static void main(String[] args) throws Exception {
48          // Configure SSL.
49          final SslContext sslCtx;
50          if (SSL) {
51              SelfSignedCertificate ssc = new SelfSignedCertificate();
52              sslCtx = SslContextBuilder.forServer(ssc.certificate(), ssc.privateKey()).build();
53          } else {
54              sslCtx = null;
55          }
56  
57          // Configure the server.
58          EventLoopGroup bossGroup = new NioEventLoopGroup(1);
59          EventLoopGroup workerGroup = new NioEventLoopGroup();
60          try {
61              ServerBootstrap b = new ServerBootstrap();
62              b.group(bossGroup, workerGroup)
63               .channel(NioServerSocketChannel.class)
64               .option(ChannelOption.SO_BACKLOG, 100)
65               .handler(new LoggingHandler(LogLevel.INFO))
66               .childHandler(new ChannelInitializer<SocketChannel>() {
67                   @Override
68                   public void initChannel(SocketChannel ch) throws Exception {
69                       ChannelPipeline p = ch.pipeline();
70                       if (sslCtx != null) {
71                           p.addLast(sslCtx.newHandler(ch.alloc()));
72                       }
73                       p.addLast(
74                               new StringEncoder(CharsetUtil.UTF_8),
75                               new LineBasedFrameDecoder(8192),
76                               new StringDecoder(CharsetUtil.UTF_8),
77                               new ChunkedWriteHandler(),
78                               new FileServerHandler());
79                   }
80               });
81  
82              // Start the server.
83              ChannelFuture f = b.bind(PORT).sync();
84  
85              // Wait until the server socket is closed.
86              f.channel().closeFuture().sync();
87          } finally {
88              // Shut down all event loops to terminate all threads.
89              bossGroup.shutdownGracefully();
90              workerGroup.shutdownGracefully();
91          }
92      }
93  }