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/*
* Copyright 2022 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.broadcast;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.traccar.config.Config;
import org.traccar.config.Keys;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.MulticastSocket;
import java.net.NetworkInterface;
import java.nio.charset.StandardCharsets;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
public class MulticastBroadcastService extends BaseBroadcastService {
private static final Logger LOGGER = LoggerFactory.getLogger(MulticastBroadcastService.class);
private final ObjectMapper objectMapper;
private final NetworkInterface networkInterface;
private final int port;
private final InetSocketAddress group;
private DatagramSocket publisherSocket;
private final ExecutorService service = Executors.newSingleThreadExecutor();
private final byte[] receiverBuffer = new byte[4096];
public MulticastBroadcastService(Config config, ObjectMapper objectMapper) throws IOException {
this.objectMapper = objectMapper;
port = config.getInteger(Keys.BROADCAST_PORT);
String interfaceName = config.getString(Keys.BROADCAST_INTERFACE);
if (interfaceName.indexOf('.') >= 0 || interfaceName.indexOf(':') >= 0) {
networkInterface = NetworkInterface.getByInetAddress(InetAddress.getByName(interfaceName));
} else {
networkInterface = NetworkInterface.getByName(interfaceName);
}
InetAddress address = InetAddress.getByName(config.getString(Keys.BROADCAST_ADDRESS));
group = new InetSocketAddress(address, port);
}
@Override
public boolean singleInstance() {
return false;
}
@Override
protected void sendMessage(BroadcastMessage message) {
try {
byte[] buffer = objectMapper.writeValueAsString(message).getBytes(StandardCharsets.UTF_8);
DatagramPacket packet = new DatagramPacket(buffer, buffer.length, group);
publisherSocket.send(packet);
} catch (IOException e) {
LOGGER.warn("Broadcast failed", e);
}
}
@Override
public void start() throws IOException {
service.submit(receiver);
}
@Override
public void stop() {
service.shutdown();
}
private final Runnable receiver = new Runnable() {
@Override
public void run() {
try (MulticastSocket socket = new MulticastSocket(port)) {
socket.setNetworkInterface(networkInterface);
socket.joinGroup(group, networkInterface);
publisherSocket = socket;
while (!service.isShutdown()) {
DatagramPacket packet = new DatagramPacket(receiverBuffer, receiverBuffer.length);
socket.receive(packet);
if (networkInterface.inetAddresses().noneMatch(a -> a.equals(packet.getAddress()))) {
String data = new String(packet.getData(), 0, packet.getLength(), StandardCharsets.UTF_8);
handleMessage(objectMapper.readValue(data, BroadcastMessage.class));
}
}
publisherSocket = null;
socket.leaveGroup(group, networkInterface);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
};
}
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