labs/cluster-management/native-agent/src/main/java/com/alibaba/arthas/nat/agent/server/forward/LocalFrameHandler.java [17:53]:
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public class LocalFrameHandler extends SimpleChannelInboundHandler<WebSocketFrame> {
    private final static Logger logger = LoggerFactory.getLogger(LocalFrameHandler.class);
    private ChannelPromise handshakeFuture;

    public LocalFrameHandler() {
    }

    public ChannelPromise handshakeFuture() {
        return handshakeFuture;
    }

    @Override
    public void handlerAdded(ChannelHandlerContext ctx) {
        handshakeFuture = ctx.newPromise();
    }

    @Override
    public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
        super.userEventTriggered(ctx, evt);
        if (evt instanceof ClientHandshakeStateEvent) {
            if (evt.equals(ClientHandshakeStateEvent.HANDSHAKE_COMPLETE)) {
                handshakeFuture.setSuccess();
            }
        }
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        logger.error("LocalFrameHandler error", cause);
        if (!handshakeFuture.isDone()) {
            handshakeFuture.setFailure(cause);
        }
        ctx.close();
    }

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, WebSocketFrame msg) throws Exception {
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tunnel-client/src/main/java/com/alibaba/arthas/tunnel/client/LocalFrameHandler.java [12:48]:
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public class LocalFrameHandler extends SimpleChannelInboundHandler<WebSocketFrame> {
    private final static Logger logger = LoggerFactory.getLogger(LocalFrameHandler.class);
    private ChannelPromise handshakeFuture;

    public LocalFrameHandler() {
    }

    public ChannelPromise handshakeFuture() {
        return handshakeFuture;
    }

    @Override
    public void handlerAdded(ChannelHandlerContext ctx) {
        handshakeFuture = ctx.newPromise();
    }

    @Override
    public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
        super.userEventTriggered(ctx, evt);
        if (evt instanceof ClientHandshakeStateEvent) {
            if (evt.equals(ClientHandshakeStateEvent.HANDSHAKE_COMPLETE)) {
                handshakeFuture.setSuccess();
            }
        }
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        logger.error("LocalFrameHandler error", cause);
        if (!handshakeFuture.isDone()) {
            handshakeFuture.setFailure(cause);
        }
        ctx.close();
    }

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, WebSocketFrame msg) throws Exception {
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