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/*
* Copyright 2015 - 2023 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.ReferenceCountUtil;
import org.traccar.config.Config;
import org.traccar.config.Keys;
import org.traccar.handler.network.AcknowledgementHandler;
import org.traccar.helper.DataConverter;
import org.traccar.model.Position;
import jakarta.inject.Inject;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.Collection;
import java.util.List;
public abstract class ExtendedObjectDecoder extends ChannelInboundHandlerAdapter {
private Config config;
public Config getConfig() {
return config;
}
@Inject
public void setConfig(Config config) {
this.config = config;
init();
}
/**
* Method called when config is initialized.
*/
protected void init() {
}
private void saveOriginal(Object decodedMessage, Object originalMessage) {
if (getConfig().getBoolean(Keys.DATABASE_SAVE_ORIGINAL) && decodedMessage instanceof Position position) {
if (originalMessage instanceof ByteBuf buf) {
position.set(Position.KEY_ORIGINAL, ByteBufUtil.hexDump(buf, 0, buf.writerIndex()));
} else if (originalMessage instanceof String stringMessage) {
position.set(Position.KEY_ORIGINAL, DataConverter.printHex(
stringMessage.getBytes(StandardCharsets.US_ASCII)));
}
}
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
NetworkMessage networkMessage = (NetworkMessage) msg;
Object originalMessage = networkMessage.getMessage();
ctx.writeAndFlush(new AcknowledgementHandler.EventReceived());
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 collection) {
ctx.writeAndFlush(new AcknowledgementHandler.EventDecoded(collection));
for (Object o : collection) {
saveOriginal(o, originalMessage);
ctx.fireChannelRead(o);
}
} else {
ctx.writeAndFlush(new AcknowledgementHandler.EventDecoded(List.of(decodedMessage)));
saveOriginal(decodedMessage, originalMessage);
ctx.fireChannelRead(decodedMessage);
}
} else {
ctx.writeAndFlush(new AcknowledgementHandler.EventDecoded(List.of()));
}
} finally {
ReferenceCountUtil.release(originalMessage);
}
}
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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