/*
 * Copyright 2018 Netflix, Inc.
 *
 *      Licensed under the Apache License, Version 2.0 (the "License");
 *      you may not use this file except in compliance with the License.
 *      You may obtain a copy of the License at
 *
 *          http://www.apache.org/licenses/LICENSE-2.0
 *
 *      Unless required by applicable law or agreed to in writing, software
 *      distributed under the License is distributed on an "AS IS" BASIS,
 *      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *      See the License for the specific language governing permissions and
 *      limitations under the License.
 */

package com.netflix.zuul.netty.server.http2;

import com.netflix.zuul.netty.RequestCancelledEvent;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.handler.codec.http2.Http2ResetFrame;
import io.netty.util.ReferenceCountUtil;

/**
 * User: michaels@netflix.com
 * Date: 4/13/17
 * Time: 6:02 PM
 */
@ChannelHandler.Sharable
public class Http2ResetFrameHandler extends ChannelInboundHandlerAdapter
{
    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception
    {
        if (msg instanceof Http2ResetFrame) {
            // Inform zuul to cancel the request.
            ctx.fireUserEventTriggered(new RequestCancelledEvent());
            ReferenceCountUtil.safeRelease(msg);
        }
        else {
            super.channelRead(ctx, msg);
        }
    }
}
