org.jdiameter.client.impl.transport.tls.netty.DiameterMessageDecoder.java Source code

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Here is the source code for org.jdiameter.client.impl.transport.tls.netty.DiameterMessageDecoder.java

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/*
 * TeleStax, Open Source Cloud Communications
 * Copyright 2011-2016, TeleStax Inc. and individual contributors
 * by the @authors tag.
 *
 * This program is free software: you can redistribute it and/or modify
 * under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation; either version 3 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 */

package org.jdiameter.client.impl.transport.tls.netty;

import java.util.List;

import org.jdiameter.api.AvpDataException;
import org.jdiameter.client.api.parser.IMessageParser;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ByteToMessageDecoder;

/**
 *
 * @author <a href="mailto:jqayyum@gmail.com"> Jehanzeb Qayyum </a>
 */
public class DiameterMessageDecoder extends ByteToMessageDecoder {
    private static final Logger logger = LoggerFactory.getLogger(DiameterMessageDecoder.class);

    protected final IMessageParser parser;
    protected final TLSClientConnection parentConnection;

    public DiameterMessageDecoder(TLSClientConnection parentConnection, IMessageParser parser) {
        this.parser = parser;
        this.parentConnection = parentConnection;
    }

    @Override
    protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) {
        logger.debug("Decode message size: {}", in.readableBytes());

        if (in.readableBytes() >= 4) {
            int first = in.getInt(in.readerIndex());
            byte version = (byte) (first >> 24);
            if (version != 1) {
                return;
            }

            int messageLength = (first & 0xFFFFFF);
            if (in.readableBytes() < messageLength) {
                return;
            }

            logger.debug("Decoding message version: {}, length: {}", version, messageLength);

            byte[] bytes = new byte[messageLength];
            in.readBytes(bytes);
            try {
                out.add(this.parser.createMessage(bytes));
            } catch (AvpDataException e) {
                logger.error(e.getMessage(), e);

                this.parentConnection.onAvpDataException(e);
            }
        }
    }
}