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/*
* Copyright 2015 - 2018 Anton Tananaev (anton@traccar.org)
*
* 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 org.traccar;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufUtil;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.util.ReferenceCounted;
import org.traccar.helper.DataConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.Collection;
public abstract class ExtendedObjectDecoder extends ChannelInboundHandlerAdapter {
private void saveOriginal(Object decodedMessage, Object originalMessage) {
if (Context.getConfig().getBoolean("database.saveOriginal") && decodedMessage instanceof Position) {
Position position = (Position) decodedMessage;
if (originalMessage instanceof ByteBuf) {
ByteBuf buf = (ByteBuf) originalMessage;
position.set(Position.KEY_ORIGINAL, ByteBufUtil.hexDump(buf));
} else if (originalMessage instanceof String) {
position.set(Position.KEY_ORIGINAL, DataConverter.printHex(
((String) originalMessage).getBytes(StandardCharsets.US_ASCII)));
}
}
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
NetworkMessage networkMessage = (NetworkMessage) msg;
Object originalMessage = networkMessage.getMessage();
try {
Object decodedMessage = decode(ctx.channel(), networkMessage.getRemoteAddress(), originalMessage);
onMessageEvent(ctx.channel(), networkMessage.getRemoteAddress(), originalMessage, decodedMessage);
if (decodedMessage == null) {
decodedMessage = handleEmptyMessage(ctx.channel(), networkMessage.getRemoteAddress(), originalMessage);
}
if (decodedMessage != null) {
if (decodedMessage instanceof Collection) {
for (Object o : (Collection) decodedMessage) {
saveOriginal(o, originalMessage);
ctx.fireChannelRead(o);
}
} else {
saveOriginal(decodedMessage, originalMessage);
ctx.fireChannelRead(decodedMessage);
}
}
} finally {
if (originalMessage instanceof ReferenceCounted) {
((ReferenceCounted) originalMessage).release();
}
}
}
protected void onMessageEvent(
Channel channel, SocketAddress remoteAddress, Object originalMessage, Object decodedMessage) {
}
protected Object handleEmptyMessage(Channel channel, SocketAddress remoteAddress, Object msg) {
return null;
}
protected abstract Object decode(Channel channel, SocketAddress remoteAddress, Object msg) throws Exception;
}
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