io.netty.channel.ChannelInitializer#io.netty.channel.ChannelPipeline源码实例Demo

@Override
public void initChannel(SocketChannel ch) throws Exception {
    ChannelPipeline pipeline = ch.pipeline();

    // Add SSL handler first to encrypt and decrypt everything.
    // In this example, we use a bogus certificate in the server side
    // and accept any invalid certificates in the client side.
    // You will need something more complicated to identify both
    // and server in the real world.
    pipeline.addLast(sslCtx.newHandler(ch.alloc()));

    // On top of the SSL handler, add the text line codec.
    pipeline.addLast(new DelimiterBasedFrameDecoder(8192, Delimiters.lineDelimiter()));
    pipeline.addLast(new StringDecoder());
    pipeline.addLast(new StringEncoder());

    // and then business logic.
    pipeline.addLast(new SecureChatServerHandler());
}
 

@Override
public void initChannel(SocketChannel ch) {
    ChannelPipeline p = ch.pipeline();

    // Enable HTTPS if necessary.
    if (sslCtx != null) {
        p.addLast(sslCtx.newHandler(ch.alloc()));
    }

    p.addLast(new HttpClientCodec());

    // Remove the following line if you don't want automatic content decompression.
    p.addLast(new HttpContentDecompressor());

    // Uncomment the following line if you don't want to handle HttpContents.
    p.addLast(new HttpObjectAggregator(1048576));

    p.addLast(nettyHttpClientHandler);
}
 

public final ChannelFuture handshake(Channel channel, final ChannelPromise promise) {

    channel.writeAndFlush(Unpooled.wrappedBuffer(version.getBytes())).addListener((ChannelFuture future) -> {
      if (!future.isSuccess()) {
        promise.setFailure(future.cause());
        return;
      }

      ChannelPipeline p = future.channel().pipeline();
      ChannelHandlerContext ctx = p.context(ProtocolHandshakeHandler.class);
      p.addBefore(ctx.name(), "rfb-handshake-decoder", newRfbClientDecoder());
      p.addBefore(ctx.name(), "rfb-handshake-encoder", newRfbClientEncoder());
      promise.setSuccess();

    });
    return promise;
  }
 

@Override
protected void initChannel(Channel channel) {
	ChannelPipeline pipeline = channel.pipeline();
	NetworkManagerWrapper networkmanager = new SpigotNetworkManagerWrapper(channel, (NetworkManager) pipeline.get(SpigotChannelHandlers.NETWORK_MANAGER));
	networkmanager.setPacketListener(new SpigotFakePacketListener(networkmanager));
	ConnectionImpl connection = new ConnectionImpl(networkmanager);
	ProtocolStorage.addConnection(channel.remoteAddress(), connection);
	pipeline.addAfter(SpigotChannelHandlers.READ_TIMEOUT, ChannelHandlers.INITIAL_DECODER, new InitialPacketDecoder());
	pipeline.addBefore(SpigotChannelHandlers.NETWORK_MANAGER, ChannelHandlers.LOGIC, new LogicHandler(connection, Packet.class));
	pipeline.remove("legacy_query");
	pipeline.replace(SpigotChannelHandlers.READ_TIMEOUT, SpigotChannelHandlers.READ_TIMEOUT, new SimpleReadTimeoutHandler(30));
	pipeline.replace(SpigotChannelHandlers.SPLITTER, SpigotChannelHandlers.SPLITTER, new SpigotWrappedSplitter());
	pipeline.replace(SpigotChannelHandlers.PREPENDER, SpigotChannelHandlers.PREPENDER, new SpigotWrappedPrepender());
	pipeline.addAfter(SpigotChannelHandlers.PREPENDER, ChannelHandlers.RAW_CAPTURE_SEND, new RawPacketDataCaptureSend(connection));
	pipeline.addAfter(SpigotChannelHandlers.SPLITTER, ChannelHandlers.RAW_CAPTURE_RECEIVE, new RawPacketDataCaptureReceive(connection));
	if (replaceDecoderEncoder) {
		if (pipeline.get(SpigotChannelHandlers.DECODER).getClass().equals(net.minecraft.server.v1_16_R1.PacketDecoder.class)) {
			pipeline.replace(SpigotChannelHandlers.DECODER, SpigotChannelHandlers.DECODER, new SpigotPacketDecoder());
		}
		if (pipeline.get(SpigotChannelHandlers.ENCODER).getClass().equals(net.minecraft.server.v1_16_R1.PacketEncoder.class)) {
			pipeline.replace(SpigotChannelHandlers.ENCODER, SpigotChannelHandlers.ENCODER, new SpigotPacketEncoder());
		}
	}
}
 

@Override
protected void initChannel(SocketChannel ch) throws Exception {
    ChannelPipeline pipeline = ch.pipeline();
    if (sslCtx != null) {
        pipeline.addLast(sslCtx.newHandler(ch.alloc()));
    }

    MixMessageEncoder encoder = new MixMessageEncoder();
    MixMessageDecoder decoder = new MixMessageDecoder();

    if (throughputCounter != null) {
        pipeline.addLast(throughputCounter, decoder, encoder, requestHandler);
    } else {
        pipeline.addLast(decoder, encoder, requestHandler);
    }
}
 

@Override
@SuppressWarnings("unchecked")
void init(Channel channel) throws Exception {
    ChannelPipeline p = channel.pipeline();
    p.addLast(config.handler());

    final Map<ChannelOption<?>, Object> options = options0();
    synchronized (options) {
        setChannelOptions(channel, options, logger);
    }

    final Map<AttributeKey<?>, Object> attrs = attrs0();
    synchronized (attrs) {
        for (Entry<AttributeKey<?>, Object> e: attrs.entrySet()) {
            channel.attr((AttributeKey<Object>) e.getKey()).set(e.getValue());
        }
    }
}
 

/**
 * Initialize the {@code SocketChannel}.
 *
 * This method initializes a new channel created by the {@code ServerBootstrap}
 *
 * The default implementation create a remote connection, configures a default pipeline
 * which handles coding/decoding messages, handshaking, timeout and error handling based
 * on {@code RpcConfig} instance provided at construction time.
 *
 * On each call to this method, every handler added must be a new instance. As of now, the
 * handlers cannot be shared across connections.
 *
 * Subclasses can override it to add extra handlers if needed.
 *
 * @param ch the socket channel
 */
protected void initChannel(final SocketChannel ch) throws SSLException {
  C connection = initRemoteConnection(ch);
  connection.setChannelCloseHandler(newCloseListener(ch, connection));

  final ChannelPipeline pipeline = ch.pipeline();
  pipeline.addLast(PROTOCOL_ENCODER, new RpcEncoder("s-" + rpcConfig.getName()));
  pipeline.addLast(MESSAGE_DECODER, newDecoder(connection.getAllocator()));
  pipeline.addLast(HANDSHAKE_HANDLER, newHandshakeHandler(connection));

  if (rpcConfig.hasTimeout()) {
    pipeline.addLast(TIMEOUT_HANDLER,
        new LoggingReadTimeoutHandler(connection, rpcConfig.getTimeout()));
  }

  pipeline.addLast(MESSAGE_HANDLER, new InboundHandler(connection));
  pipeline.addLast(EXCEPTION_HANDLER, new RpcExceptionHandler<>(connection));
}
 

@Override
protected void initChannel(SocketChannel ch) throws Exception {
    ChannelPipeline ph = ch.pipeline();
    /*
     * 解码和编码，应和服务端一致
     * */
    //入参说明: 读超时时间、写超时时间、所有类型的超时时间、时间格式
    ph.addLast(new IdleStateHandler(0, 4, 0, TimeUnit.SECONDS));  
    
    //传输的协议 Protobuf
    ph.addLast(new ProtobufVarint32FrameDecoder());
    ph.addLast(new ProtobufDecoder(UserMsg.getDefaultInstance()));
    ph.addLast(new ProtobufVarint32LengthFieldPrepender());
    ph.addLast(new ProtobufEncoder());
   
    //业务逻辑实现类
    ph.addLast("nettyClientHandler",nettyClientHandler);
  
}
 

@Override
protected void initChannel(Channel ch) throws Exception {
       ChannelPipeline pipeline = ch.pipeline();
       pipeline.addLast(new IdleStateHandler(0,0,35));
       pipeline.addLast(new IdleStateTrigger());
       //��ư��ĸ�ʽ 1�ֽڹ̶���ͷ  1�ֽڹ�����  1�ֽڣ��ж��Ƿ����topic�ֶΣ� 4�ֽڹ̶������ֶ�   12�ֽڹ̶�topic���DZ��룩  ʣ���ֽ�����
       pipeline.addLast(new LengthFieldBasedFrameDecoder(2048, 3, 4, 0, 0));
       pipeline.addLast(new MessageToPoDecoder());
       //�����֤�Ĵ�����
       //pipeline.addLast("auth",new AuthenticationHandler());
       //���Э�鴦����
       pipeline.addLast( "message-process", new MessageProcessHandler());
       pipeline.addLast(new MessageEncoder());
       //pipeline.addLast("auth",new AuthenticationHandler());
       //pipeline.addLast(new StringDecoder(CharsetUtil.UTF_8));
}
 

@Override
protected void initChannel(Channel channel) throws Exception {
  ChannelPipeline pipeline = channel.pipeline();

  // Uncomment the following lines if you want HTTPS
  //SSLEngine engine = SecureChatSslContextFactory.getServerContext().createSSLEngine();
  //engine.setUseClientMode(false);
  //pipeline.addLast("ssl", new SslHandler(engine));

  pipeline.addLast("encoder", new HttpResponseEncoder());
  pipeline.addLast("decoder", new HttpRequestDecoder());
  pipeline.addLast("aggregator", new HttpObjectAggregator(65536));
  pipeline.addLast("chunkedWriter", new ChunkedWriteHandler());

  pipeline.addLast("handler", new HttpFileServerHandler());
}
 

@Override
public void initChannel(SocketChannel ch) {
    ChannelPipeline pipeline = ch.pipeline();

    if (sslCtx != null) {
        pipeline.addLast(sslCtx.newHandler(ch.alloc()));
    }

    pipeline.addLast(new HttpRequestDecoder());
    pipeline.addLast(new HttpResponseEncoder());

    // Remove the following line if you don't want automatic content compression.
    pipeline.addLast(new HttpContentCompressor());

    pipeline.addLast(new HttpUploadServerHandler());
}
 

private Bootstrap initClientBootstrap() {
    Bootstrap b = new Bootstrap();
    eventLoopGroup = new NioEventLoopGroup();
    b.group(eventLoopGroup)
        .channel(NioSocketChannel.class)
        .option(ChannelOption.TCP_NODELAY, true)
        .option(ChannelOption.ALLOCATOR, PooledByteBufAllocator.DEFAULT)
        .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, ClusterClientConfigManager.getConnectTimeout())
        .handler(new ChannelInitializer<SocketChannel>() {
            @Override
            public void initChannel(SocketChannel ch) throws Exception {
                clientHandler = new TokenClientHandler(currentState, disconnectCallback);

                ChannelPipeline pipeline = ch.pipeline();
                pipeline.addLast(new LengthFieldBasedFrameDecoder(1024, 0, 2, 0, 2));
                pipeline.addLast(new NettyResponseDecoder());
                pipeline.addLast(new LengthFieldPrepender(2));
                pipeline.addLast(new NettyRequestEncoder());
                pipeline.addLast(clientHandler);
            }
        });

    return b;
}
 

@Override
public void initChannel(SocketChannel ch) {
    ChannelPipeline pipeline = ch.pipeline();

    if (sslCtx != null) {
        pipeline.addLast(sslCtx.newHandler(ch.alloc()));
    }

    pipeline.addLast(new HttpRequestDecoder());
    pipeline.addLast(new HttpResponseEncoder());

    // Remove the following line if you don't want automatic content compression.
    pipeline.addLast(new HttpContentCompressor());

    pipeline.addLast(new HttpUploadServerHandler());
}
 

@Override
protected void initChannel(SocketChannel channel)
{
    ChannelPipeline pipeline = channel.pipeline();

    if (sslContextSupplier.isPresent()) {
        if (allowPlainText) {
            pipeline.addLast(new OptionalSslHandler(sslContextSupplier.get().get()));
        }
        else {
            pipeline.addLast(sslContextSupplier.get().get().newHandler(channel.alloc()));
        }
    }

    pipeline.addLast(new ThriftProtocolDetection(
            new ThriftServerHandler(methodInvoker, requestTimeout, timeoutExecutor),
            maxFrameSize,
            assumeClientsSupportOutOfOrderResponses));
}
 

private boolean handleReadException(ChannelPipeline pipeline, ByteBuf byteBuf, Throwable cause, boolean close) {
    if (byteBuf != null) {
        if (byteBuf.isReadable()) {
            readPending = false;
            pipeline.fireChannelRead(byteBuf);
        } else {
            byteBuf.release();
        }
    }
    pipeline.fireChannelReadComplete();
    pipeline.fireExceptionCaught(cause);
    if (close || cause instanceof IOException) {
        closeOnRead(pipeline);
        return true;
    }
    return false;
}
 

public static void main(String[] args) throws Exception {
	ChannelInitializer<SocketChannel> initializer = new ChannelInitializer<SocketChannel>() {
		@Override
		public void initChannel(SocketChannel ch) throws Exception {
			ChannelPipeline p = ch.pipeline();
			p.addLast(new StringEncoder());
			p.addLast(new StringDecoder());
			p.addLast(new ChannelInboundHandlerAdapter() {
				@Override
				public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
					System.out.println(msg);
					ctx.close();
				}
			});
		}
	};
	BootstrapTemplate.newServerBootstrap(HOST, PORT, initializer);
}
 

@Override
protected void configureServer(Iso8583Server<IsoMessage> server) {
    server.setConfigurer(new ConnectorConfigurer<>() {

        @Override
        public void configurePipeline(ChannelPipeline pipeline, ServerConfiguration configuration) {
            pipeline.addBefore("idleEventHandler", "connectListenerHandler", new ChannelInboundHandlerAdapter() {
                @Override
                public void channelActive(ChannelHandlerContext ctx) throws Exception {
                    super.channelActive(ctx);
                    final IsoMessage message = server.getIsoMessageFactory().newMessage(0x800);
                    ctx.writeAndFlush(message);
                }
            });
        }
    });
}
 

public static void serializePipeline(SerializeProtocolEnum serializeProtocol, ChannelPipeline pipeline) {
    switch (serializeProtocol) {
        case KRYO:
            KryoCodecServiceImpl kryoCodecServiceImpl = new KryoCodecServiceImpl(KryoPoolFactory.getKryoPoolInstance());
            pipeline.addLast(new KryoEncoder(kryoCodecServiceImpl));
            pipeline.addLast(new KryoDecoder(kryoCodecServiceImpl));
            break;
        case HESSIAN:
            HessianCodecServiceImpl hessianCodecServiceImpl = new HessianCodecServiceImpl();
            pipeline.addLast(new HessianEncoder(hessianCodecServiceImpl));
            pipeline.addLast(new HessianDecoder(hessianCodecServiceImpl));
            break;
        case PROTOSTUFF:
            ProtostuffCodecServiceImpl protostuffCodecServiceImpl = new ProtostuffCodecServiceImpl();
            pipeline.addLast(new ProtostuffEncoder(protostuffCodecServiceImpl));
            pipeline.addLast(new ProtostuffDecoder(protostuffCodecServiceImpl));
            break;
        default:
            KryoCodecServiceImpl defaultCodec = new KryoCodecServiceImpl(KryoPoolFactory.getKryoPoolInstance());
            pipeline.addLast(new KryoEncoder(defaultCodec));
            pipeline.addLast(new KryoDecoder(defaultCodec));
            break;
    }
}
 

@Override
public void buildBungeeServer(Channel channel, Connection connection) {
	ChannelPipeline pipeline = channel.pipeline();
	pipeline.addFirst(new EncapsulatedHandshakeSender(null, false));
	NetworkDataCache cache = NetworkDataCache.getFrom(connection);
	pipeline.replace(PipelineUtils.PACKET_DECODER, PipelineUtils.PACKET_DECODER, new FromServerPacketDecoder(connection, cache));
	pipeline.replace(PipelineUtils.PACKET_ENCODER, PipelineUtils.PACKET_ENCODER, new ToServerPacketEncoder(connection, cache));
	pipeline.get(CustomHandlerBoss.class).setHandlerChangeListener(handler -> {
		try {
			return (handler instanceof DownstreamBridge) ? new EntityRewriteDownstreamBridge(
				ReflectionUtils.getFieldValue(handler, "con"), connection.getVersion()
			) : handler;
		} catch (IllegalArgumentException | IllegalAccessException e) {
			throw new RuntimeException(e);
		}
	});
}
 

private void createChannel(int port) throws InterruptedException {
    ServerBootstrap b = new ServerBootstrap();
    EventLoopGroup bossGroup = new NioEventLoopGroup(1);
    EventLoopGroup workerGroup = new NioEventLoopGroup(2);
    b.group(bossGroup, workerGroup)
            .channel(NioServerSocketChannel.class)
            .handler(new LoggingHandler(LogLevel.INFO))
            .childHandler(new ChannelInitializer<SocketChannel>() {
                @Override
                public void initChannel(SocketChannel ch) throws Exception {
                    ChannelPipeline p = ch.pipeline();
                    p.addLast(new LoggingHandler(LogLevel.DEBUG));
                    p.addLast(new NettySimpleMessageHandler());
                    p.addLast(new NettyMasterHandler(null, new CommandHandlerManager(), 1000 * 60 * 24));
                    p.addLast(new HAProxyMessageDecoder());
                }
            });
    b.bind(port).sync();
}
 

public ProxyServer(int requestedPort, RequestFilter requestFilter, ResponseFilter responseFilter) {
    bossGroup = new NioEventLoopGroup(1);
    workerGroup = new NioEventLoopGroup(8);
    try {
        ServerBootstrap b = new ServerBootstrap();
        b.group(bossGroup, workerGroup)
                .channel(NioServerSocketChannel.class)
                .childHandler(new ChannelInitializer() {
                    @Override
                    protected void initChannel(Channel c) {
                        ChannelPipeline p = c.pipeline();
                        p.addLast(new HttpServerCodec());
                        p.addLast(new HttpObjectAggregator(1048576));
                        p.addLast(new ProxyClientHandler(requestFilter, responseFilter));
                    }
                });
        channel = b.bind(requestedPort).sync().channel();
        InetSocketAddress isa = (InetSocketAddress) channel.localAddress();
        String host = "127.0.0.1"; //isa.getHostString();
        port = isa.getPort();
        logger.info("proxy server started - http://{}:{}", host, port);
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}
 

@Override
public void initChannel(SocketChannel ch) {
    ChannelPipeline pipeline = ch.pipeline();

    // HttpServerCodec is a combination of HttpRequestDecoder and HttpResponseEncoder
    // 使用HttpServerCodec将ByteBuf编解码为httpRequest/httpResponse
    pipeline.addLast(new HttpServerCodec());
    addAdvanced(pipeline);
    pipeline.addLast(new ChunkedWriteHandler());
    // 路由分发器
    pipeline.addLast(new ControllerDispatcher());
}
 

/**
 * 通道注册的时候配置websocket解码handler
 */
@Override
protected final void initChannel(Channel ch) throws Exception {
	ChannelPipeline pipeline=ch.pipeline();
	if (sslCtx != null) {
		pipeline.addLast(sslCtx.newHandler(ch.alloc(),host,port));
       }
	pipeline.addLast(new HttpClientCodec());
	pipeline.addLast(new ChunkedWriteHandler());
	pipeline.addLast(new HttpObjectAggregator(64*1024));
	pipeline.addLast(new WebSocketClientProtocolHandler(WebSocketClientHandshakerFactory.newHandshaker(webSocketURL, WebSocketVersion.V13, subprotocol, false, new DefaultHttpHeaders())));
       pipeline.addLast(new WebSocketConnectedClientHandler());//连接成功监听handler
}
 

@Override
protected void initChannel(final SocketChannel ch) throws Exception {
    final ChannelPipeline pipeline = ch.pipeline();

    pipeline.addLast(new ObjectDecoder(ClassResolvers.cacheDisabled(null)));
    pipeline.addLast(encoder);
    pipeline.addLast(new IdleStateHandler(config.getMaxReadIdleSeconds(), 0, 0));

    pipeline.addLast(peerChannelHandlerExecutorGroup, peerChannelHandler);
}
 

private void dispatchToHttp(ChannelHandlerContext ctx) {
    ChannelPipeline pipeline = ctx.pipeline();
    pipeline.addLast(new HttpServerCodec());
    pipeline.addLast(new ChunkedWriteHandler());
    // aggregate HttpRequest/HttpContent/LastHttpContent to FullHttpRequest
    pipeline.addLast(new HttpObjectAggregator(8096));
    pipeline.addLast(HttpHandler.getInstance(channelListener));
    pipeline.remove(this);
    // 将channelActive事件传递到HttpHandler
    ctx.fireChannelActive();
}
 

private void switchToHttp(ChannelHandlerContext ctx) {
    ChannelPipeline p = ctx.pipeline();
    p.addLast("decoder", new HttpRequestDecoder());
    p.addLast("encoder", new HttpResponseEncoder());
    p.addLast("deflater", new HttpContentCompressor());
    p.addLast("handler", new HttpSnoopServerHandler());
    p.remove(this);
}
 

@Override
protected void initChannel(SocketChannel ch) throws Exception {
    final ChannelPipeline pipeline = ch.pipeline();
    pipeline.addLast("httpDecoder", new HttpRequestDecoder());

    pipeline.addLast("httpAggregator", new HttpObjectAggregator(conf.getClientMaxBodySize()));
    pipeline.addLast("httpResponseEncoder", new HttpResponseEncoder());
    pipeline.addLast("httpMyResponseHandler", new HttpSearchResponseHandler());

    pipeline.addLast("httpSearchDecoder", new SearchQueryDecoder());

    RestClient restClient = applicationContext.getBean("elasticRestClient", RestClient.class);

    pipeline.addLast("httpSearchHandler", new HttpSearchHandler(this.executor, restClient));
}
 

@Override
protected void initChannel(final SocketChannel socketChannel) {
    DatabaseType databaseType = ProxySchemaContexts.getInstance().getSchemaContexts().getSchemaContexts().values().iterator().next().getSchema().getDatabaseType();
    DatabaseProtocolFrontendEngine databaseProtocolFrontendEngine = DatabaseProtocolFrontendEngineFactory.newInstance(databaseType);
    ChannelPipeline pipeline = socketChannel.pipeline();
    pipeline.addLast(new PacketCodec(databaseProtocolFrontendEngine.getCodecEngine()));
    pipeline.addLast(new FrontendChannelInboundHandler(databaseProtocolFrontendEngine));
}
 

@Override
protected void initChannel(SocketChannel socketChannel) {
    //channel 代表了一个socket.
    ChannelPipeline pipeline = socketChannel.pipeline();
    pipeline.addLast(new ReadTimeoutHandler(1));

    /**
     * http-request解码器
     * http服务器端对request解码
     */
    pipeline.addLast("decoder", new HttpRequestDecoder(8192, 8192, 8192));
    /**
     * http-response解码器
     * http服务器端对response编码
     */
    pipeline.addLast("encoder", new HttpResponseEncoder());

    /**
     * 把多个消息转换为一个单一的FullHttpRequest或是FullHttpResponse
     */
    pipeline.addLast("aggregator", new HttpObjectAggregator(10 * 1024 * 1024));

    /**
     * 压缩
     */
    pipeline.addLast(new HttpContentCompressor());

    /**
     * handler分为两种，inbound handler,outbound handler,分别处理 流入，流出。
     * 服务端业务逻辑
     */
    pipeline.addLast(new HttpServerHandler());

}
 

public void removeReadTimeoutHandler()
{
    // Remove (and therefore destroy) the readTimeoutHandler when we release the
    // channel back to the pool. As don't want it timing-out when it's not in use.
    final ChannelPipeline pipeline = getChannel().pipeline();
    removeHandlerFromPipeline(READ_TIMEOUT_HANDLER_NAME, pipeline);
}