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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.util.SelfSignedCertificate;
34  import io.netty.handler.stream.ChunkedWriteHandler;
35  import io.netty.util.CharsetUtil;
36  
37  /**
38   * Server that accept the path of a file an echo back its content.
39   */
40  public final class FileServer {
41  
42      static final boolean SSL = System.getProperty("ssl") != null;
43      // Use the same default port with the telnet example so that we can use the telnet client example to access it.
44      static final int PORT = Integer.parseInt(System.getProperty("port", SSL? "8992" : "8023"));
45  
46      public static void main(String[] args) throws Exception {
47          // Configure SSL.
48          final SslContext sslCtx;
49          if (SSL) {
50              SelfSignedCertificate ssc = new SelfSignedCertificate();
51              sslCtx = SslContext.newServerContext(ssc.certificate(), ssc.privateKey());
52          } else {
53              sslCtx = null;
54          }
55  
56          // Configure the server.
57          EventLoopGroup bossGroup = new NioEventLoopGroup(1);
58          EventLoopGroup workerGroup = new NioEventLoopGroup();
59          try {
60              ServerBootstrap b = new ServerBootstrap();
61              b.group(bossGroup, workerGroup)
62               .channel(NioServerSocketChannel.class)
63               .option(ChannelOption.SO_BACKLOG, 100)
64               .handler(new LoggingHandler(LogLevel.INFO))
65               .childHandler(new ChannelInitializer<SocketChannel>() {
66                   @Override
67                   public void initChannel(SocketChannel ch) throws Exception {
68                       ChannelPipeline p = ch.pipeline();
69                       if (sslCtx != null) {
70                           p.addLast(sslCtx.newHandler(ch.alloc()));
71                       }
72                       p.addLast(
73                               new StringEncoder(CharsetUtil.UTF_8),
74                               new LineBasedFrameDecoder(8192),
75                               new StringDecoder(CharsetUtil.UTF_8),
76                               new ChunkedWriteHandler(),
77                               new FileServerHandler());
78                   }
79               });
80  
81              // Start the server.
82              ChannelFuture f = b.bind(PORT).sync();
83  
84              // Wait until the server socket is closed.
85              f.channel().closeFuture().sync();
86          } finally {
87              // Shut down all event loops to terminate all threads.
88              bossGroup.shutdownGracefully();
89              workerGroup.shutdownGracefully();
90          }
91      }
92  }