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/*
 * Copyright 2020 The Netty Project
 *
 * The Netty Project licenses this file to you 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:
 *
 *   https://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 io.netty.example.haproxy;

import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelOutboundHandlerAdapter;
import io.netty.channel.ChannelPromise;
import io.netty.handler.codec.haproxy.HAProxyMessage;
import io.netty.handler.codec.haproxy.HAProxyMessageEncoder;

public class HAProxyHandler extends ChannelOutboundHandlerAdapter {

    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
        ctx.pipeline().addBefore(ctx.name(), null, HAProxyMessageEncoder.INSTANCE);
        super.handlerAdded(ctx);
    }

    @Override
    public void write(final ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
        ChannelFuture future = ctx.write(msg, promise);
        if (msg instanceof HAProxyMessage) {
            future.addListener(new ChannelFutureListener() {
                @Override
                public void operationComplete(ChannelFuture future) throws Exception {
                    if (future.isSuccess()) {
                        ctx.pipeline().remove(HAProxyMessageEncoder.INSTANCE);
                        ctx.pipeline().remove(HAProxyHandler.this);
                    } else {
                        ctx.close();
                    }
                }
            });
        }
    }
}