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Encrypted, high-performance, and event-driven/reactive network stack for Java 11+

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/*
 * Copyright 2010 dorkbox, llc
 *
 * 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 dorkbox.network.pipeline.discovery;

import dorkbox.network.Broadcast;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.socket.DatagramPacket;
import io.netty.util.AttributeKey;

import java.net.InetSocketAddress;

public
class ClientDiscoverHostHandler extends SimpleChannelInboundHandler {
    // This uses CHANNEL LOCAL to save the data.

    public static final AttributeKey STATE = AttributeKey.valueOf(ClientDiscoverHostHandler.class, "Discover.state");

    @Override
    protected
    void channelRead0(final ChannelHandlerContext context, final DatagramPacket message) throws Exception {
        ByteBuf data = message.content();
        if (data.readableBytes() == 1 && data.readByte() == Broadcast.broadcastResponseID) {
            context.channel()
                   .attr(STATE)
                   .set(message.sender());
            context.channel()
                   .close();
        }
    }

    @Override
    public
    void exceptionCaught(ChannelHandlerContext context, Throwable cause) throws Exception {
        context.channel()
               .close();
    }
}