Examples with DatagramDnsQueryEncoder io.netty.handler.codec.dns.DatagramDnsQueryEncoder used on opensource projects

Example 1 with DatagramDnsQueryEncoder

use of io.netty.handler.codec.dns.DatagramDnsQueryEncoder in project netty by netty.

the class DnsClient method main.

public static void main(String[] args) throws Exception {
    InetSocketAddress addr = new InetSocketAddress(DNS_SERVER_HOST, DNS_SERVER_PORT);
    EventLoopGroup group = new NioEventLoopGroup();
    try {
        Bootstrap b = new Bootstrap();
        b.group(group).channel(NioDatagramChannel.class).handler(new ChannelInitializer<DatagramChannel>() {

            @Override
            protected void initChannel(DatagramChannel ch) throws Exception {
                ChannelPipeline p = ch.pipeline();
                p.addLast(new DatagramDnsQueryEncoder()).addLast(new DatagramDnsResponseDecoder()).addLast(new SimpleChannelInboundHandler<DatagramDnsResponse>() {

                    @Override
                    protected void channelRead0(ChannelHandlerContext ctx, DatagramDnsResponse msg) {
                        try {
                            handleQueryResp(msg);
                        } finally {
                            ctx.close();
                        }
                    }
                });
            }
        });
        final Channel ch = b.bind(0).sync().channel();
        DnsQuery query = new DatagramDnsQuery(null, addr, 1).setRecord(DnsSection.QUESTION, new DefaultDnsQuestion(QUERY_DOMAIN, DnsRecordType.A));
        ch.writeAndFlush(query).sync();
        boolean succ = ch.closeFuture().await(10, TimeUnit.SECONDS);
        if (!succ) {
            System.err.println("dns query timeout!");
            ch.close().sync();
        }
    } finally {
        group.shutdownGracefully();
    }
}