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    • dorkbox.network.pipeline.udp.KryoEncoderUdp Maven / Gradle / Ivy

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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.udp;

import dorkbox.network.connection.EndPoint;
import dorkbox.network.util.CryptoSerializationManager;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.socket.DatagramPacket;
import io.netty.handler.codec.MessageToMessageEncoder;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.List;

@Sharable
// UDP uses messages --- NOT bytebuf!
// ONLY USED BY THE CLIENT (the server has it's own handler!)
public
class KryoEncoderUdp extends MessageToMessageEncoder {

    private static final int maxSize = EndPoint.udpMaxSize;
    private final CryptoSerializationManager serializationManager;


    public
    KryoEncoderUdp(CryptoSerializationManager serializationManager) {
        super();
        this.serializationManager = serializationManager;
    }

    // the crypto writer will override this
    void writeObject(CryptoSerializationManager serializationManager, ChannelHandlerContext context, Object msg, ByteBuf buffer)
                    throws IOException {
        // no connection here because we haven't created one yet. When we do, we replace this handler with a new one.
        serializationManager.write(buffer, msg);
    }

    @Override
    protected
    void encode(ChannelHandlerContext ctx, Object msg, List out) throws Exception {
        if (msg != null) {
            try {
                ByteBuf outBuffer = Unpooled.buffer(maxSize);

                // no size info, since this is UDP, it is not segmented
                writeObject(this.serializationManager, ctx, msg, outBuffer);

                // have to check to see if we are too big for UDP!
                if (outBuffer.readableBytes() > maxSize) {

                    String message = "Object is TOO BIG FOR UDP! " + msg.toString() + " (Max " + maxSize + ", was " +
                                     outBuffer.readableBytes() + ")";
                    LoggerFactory.getLogger(this.getClass()).error(message);
                    throw new IOException(message);
                }

                DatagramPacket packet = new DatagramPacket(outBuffer,
                                                           (InetSocketAddress) ctx.channel()
                                                                                  .remoteAddress());
                out.add(packet);
            } catch (Exception e) {
                String message = "Unable to serialize object of type: " + msg.getClass()
                                                                             .getName();
                LoggerFactory.getLogger(this.getClass()).error(message, e);
                throw new IOException(message, e);
            }
        }
    }
}
    
    
    
    

    




    
    
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