main() — netty Function Reference

Architecture documentation for the main() function in OcspClientExample.java from the netty codebase.

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Dependency Diagram

graph TD
  d4458b73_b004_4daf_0b0c_59a3db2c8882["main()"]
  b9432e46_513a_9655_4561_4a9c7c3a3848["OcspClientExample"]
  d4458b73_b004_4daf_0b0c_59a3db2c8882 -->|defined in| b9432e46_513a_9655_4561_4a9c7c3a3848
  447e7dc1_343c_edfd_88f0_01d4df3f2d14["newClientHandler()"]
  d4458b73_b004_4daf_0b0c_59a3db2c8882 -->|calls| 447e7dc1_343c_edfd_88f0_01d4df3f2d14
  style d4458b73_b004_4daf_0b0c_59a3db2c8882 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

example/src/main/java/io/netty/example/ocsp/OcspClientExample.java lines 67–118

    public static void main(String[] args) throws Exception {
        if (!OpenSsl.isAvailable()) {
            throw new IllegalStateException("OpenSSL is not available!");
        }

        if (!OpenSsl.isOcspSupported()) {
            throw new IllegalStateException("OCSP is not supported!");
        }

        // Using Wikipedia as an example. I'd rather use Netty's own website
        // but the server (Cloudflare) doesn't support OCSP stapling. A few
        // other examples could be Microsoft or Squarespace. Use OpenSSL's
        // CLI client to assess if a server supports OCSP stapling. E.g.:
        //
        // openssl s_client -tlsextdebug -status -connect www.squarespace.com:443
        //
        String host = "www.wikipedia.org";

        ReferenceCountedOpenSslContext context
            = (ReferenceCountedOpenSslContext) SslContextBuilder.forClient()
                .sslProvider(SslProvider.OPENSSL)
                .enableOcsp(true)
                .build();

        try {
            EventLoopGroup group = new MultiThreadIoEventLoopGroup(NioIoHandler.newFactory());
            try {
                Promise<FullHttpResponse> promise = group.next().newPromise();

                Bootstrap bootstrap = new Bootstrap()
                        .channel(NioSocketChannel.class)
                        .group(group)
                        .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 5 * 1000)
                        .handler(newClientHandler(context, host, promise));

                Channel channel = bootstrap.connect(host, 443)
                        .syncUninterruptibly()
                        .channel();

                try {
                    FullHttpResponse response = promise.get();
                    ReferenceCountUtil.release(response);
                } finally {
                    channel.close();
                }
            } finally {
                group.shutdownGracefully();
            }
        } finally {
            context.release();
        }
    }