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package com.alibaba.arthas.nat.agent.server.forward;

import com.alibaba.arthas.tunnel.client.ChannelUtils;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.util.ReferenceCountUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


/**
 * @description: RelayHandler
 * @author：flzjkl
 * @date: 2024-08-25 22:12
 */
public final class RelayHandler extends ChannelInboundHandlerAdapter {
    private final static Logger logger = LoggerFactory.getLogger(RelayHandler.class);
    private final Channel relayChannel;

    public RelayHandler(Channel relayChannel) {
        this.relayChannel = relayChannel;
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) {
        ctx.writeAndFlush(Unpooled.EMPTY_BUFFER);
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) {
        if (relayChannel.isActive()) {
            relayChannel.writeAndFlush(msg);
        } else {
            ReferenceCountUtil.release(msg);
        }
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) {
        if (relayChannel.isActive()) {
            ChannelUtils.closeOnFlush(relayChannel);
        }
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        logger.error("RelayHandler error", cause);
        try {
            if (relayChannel.isActive()) {
                relayChannel.close();
            }
        } finally {
            ctx.close();
        }
    }
}