channelRead0() — netty Function Reference

Architecture documentation for the channelRead0() function in SocksServerConnectHandler.java from the netty codebase.

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Dependency Diagram

graph TD
  81e7ae8a_cfa9_44fc_c226_d63eb601795a["channelRead0()"]
  bf2e2d64_3556_080a_9419_3c76234f742a["SocksServerConnectHandler"]
  81e7ae8a_cfa9_44fc_c226_d63eb601795a -->|defined in| bf2e2d64_3556_080a_9419_3c76234f742a
  style 81e7ae8a_cfa9_44fc_c226_d63eb601795a fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

example/src/main/java/io/netty/example/socksproxy/SocksServerConnectHandler.java lines 41–129

    @Override
    public void channelRead0(final ChannelHandlerContext ctx, final SocksMessage message) throws Exception {
        if (message instanceof Socks4CommandRequest) {
            final Socks4CommandRequest request = (Socks4CommandRequest) message;
            Promise<Channel> promise = ctx.executor().newPromise();
            promise.addListener(
                    (FutureListener<Channel>) future -> {
                        final Channel outboundChannel = future.getNow();
                        if (future.isSuccess()) {
                            ChannelFuture responseFuture = ctx.channel().writeAndFlush(
                                    new DefaultSocks4CommandResponse(Socks4CommandStatus.SUCCESS));

                            responseFuture.addListener(channelFuture -> {
                                ctx.pipeline().remove(SocksServerConnectHandler.this);
                                outboundChannel.pipeline().addLast(new RelayHandler(ctx.channel()));
                                ctx.pipeline().addLast(new RelayHandler(outboundChannel));
                            });
                        } else {
                            ctx.channel().writeAndFlush(
                                    new DefaultSocks4CommandResponse(Socks4CommandStatus.REJECTED_OR_FAILED));
                            SocksServerUtils.closeOnFlush(ctx.channel());
                        }
                    });

            final Channel inboundChannel = ctx.channel();
            b.group(inboundChannel.eventLoop())
                    .channel(NioSocketChannel.class)
                    .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 10000)
                    .option(ChannelOption.SO_KEEPALIVE, true)
                    .handler(new DirectClientHandler(promise));

            b.connect(request.dstAddr(), request.dstPort()).addListener(future -> {
                if (future.isSuccess()) {
                    // Connection established use handler provided results
                } else {
                    // Close the connection if the connection attempt has failed.
                    ctx.channel().writeAndFlush(
                            new DefaultSocks4CommandResponse(Socks4CommandStatus.REJECTED_OR_FAILED)
                    );
                    SocksServerUtils.closeOnFlush(ctx.channel());
                }
            });
        } else if (message instanceof Socks5CommandRequest) {
            final Socks5CommandRequest request = (Socks5CommandRequest) message;
            Promise<Channel> promise = ctx.executor().newPromise();
            promise.addListener(
                    (FutureListener<Channel>) future -> {
                        final Channel outboundChannel = future.getNow();
                        if (future.isSuccess()) {
                            ChannelFuture responseFuture =
                                    ctx.channel().writeAndFlush(new DefaultSocks5CommandResponse(
                                            Socks5CommandStatus.SUCCESS,
                                            request.dstAddrType(),
                                            request.dstAddr(),
                                            request.dstPort()));

                            responseFuture.addListener(f -> {
                                ctx.pipeline().remove(SocksServerConnectHandler.this);
                                outboundChannel.pipeline().addLast(new RelayHandler(ctx.channel()));
                                ctx.pipeline().addLast(new RelayHandler(outboundChannel));
                            });
                        } else {
                            ctx.channel().writeAndFlush(new DefaultSocks5CommandResponse(
                                    Socks5CommandStatus.FAILURE, request.dstAddrType()));
                            SocksServerUtils.closeOnFlush(ctx.channel());
                        }
                    });

            final Channel inboundChannel = ctx.channel();
            b.group(inboundChannel.eventLoop())
                    .channel(NioSocketChannel.class)
                    .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 10000)
                    .option(ChannelOption.SO_KEEPALIVE, true)
                    .handler(new DirectClientHandler(promise));

            b.connect(request.dstAddr(), request.dstPort()).addListener(future -> {
                if (future.isSuccess()) {
                    // Connection established use handler provided results
                } else {
                    // Close the connection if the connection attempt has failed.
                    ctx.channel().writeAndFlush(

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Defined In

example/src/main/java/io/netty/example/socksproxy/SocksServerConnectHandler.java

Source

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Frequently Asked Questions

What does channelRead0() do?

channelRead0() is a function in the netty codebase, defined in example/src/main/java/io/netty/example/socksproxy/SocksServerConnectHandler.java.

Where is channelRead0() defined?

channelRead0() is defined in example/src/main/java/io/netty/example/socksproxy/SocksServerConnectHandler.java at line 41.

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