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| -rw-r--r-- | src/main/java/org/traccar/broadcast/RedisBroadcastService.java | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/broadcast/RedisBroadcastService.java b/src/main/java/org/traccar/broadcast/RedisBroadcastService.java new file mode 100644 index 000000000..a6968c894 --- /dev/null +++ b/src/main/java/org/traccar/broadcast/RedisBroadcastService.java @@ -0,0 +1,206 @@ +/* + * Copyright 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.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 org.traccar.model.BaseModel; +import org.traccar.model.Device; +import org.traccar.model.Event; +import org.traccar.model.Permission; +import org.traccar.model.Position; + +import java.io.IOException; +import java.nio.charset.StandardCharsets; +import java.util.HashSet; +import java.util.Map; +import java.util.Set; +import java.util.concurrent.ExecutorService; +import java.util.concurrent.Executors; +import redis.clients.jedis.Jedis; +import redis.clients.jedis.JedisPubSub; + +public class RedisBroadcastService implements BroadcastService { + + private static final Logger LOGGER = LoggerFactory.getLogger(RedisBroadcastService.class); + + private final ObjectMapper objectMapper; + + private final ExecutorService service = Executors.newSingleThreadExecutor(); + + private final Set<BroadcastInterface> listeners = new HashSet<>(); + + private final String url; + private final String pubsubChannel = "traccar:cast"; + + private final Jedis subscriberJedis; + private final Jedis publisherJedis; + + private final String id; + + public RedisBroadcastService(Config config, ObjectMapper objectMapper) throws IOException { + this.objectMapper = objectMapper; + url = config.getString(Keys.BROADCAST_ADDRESS); + + subscriberJedis = new Jedis(url); + publisherJedis = new Jedis(url); + + // id that will be used to identify this instance of the server + id = String.valueOf(System.currentTimeMillis()); + } + + @Override + public boolean singleInstance() { + return false; + } + + @Override + public void registerListener(BroadcastInterface listener) { + listeners.add(listener); + } + + @Override + public void updateDevice(boolean local, Device device) { + BroadcastMessage message = new BroadcastMessage(); + message.setDevice(device); + sendMessage(message); + } + + @Override + public void updatePosition(boolean local, Position position) { + BroadcastMessage message = new BroadcastMessage(); + message.setPosition(position); + sendMessage(message); + } + + @Override + public void updateEvent(boolean local, long userId, Event event) { + BroadcastMessage message = new BroadcastMessage(); + message.setUserId(userId); + message.setEvent(event); + sendMessage(message); + } + + @Override + public void updateCommand(boolean local, long deviceId) { + BroadcastMessage message = new BroadcastMessage(); + message.setCommandDeviceId(deviceId); + sendMessage(message); + } + + @Override + public void invalidateObject(boolean local, Class<? extends BaseModel> clazz, long id) { + BroadcastMessage message = new BroadcastMessage(); + message.setChanges(Map.of(Permission.getKey(clazz), id)); + sendMessage(message); + } + + @Override + public void invalidatePermission( + boolean local, + Class<? extends BaseModel> clazz1, long id1, + Class<? extends BaseModel> clazz2, long id2) { + BroadcastMessage message = new BroadcastMessage(); + message.setChanges(Map.of(Permission.getKey(clazz1), id1, Permission.getKey(clazz2), id2)); + sendMessage(message); + } + + private void sendMessage(BroadcastMessage message) { + try { + String payload = id + ":" + objectMapper.writeValueAsString(message); + publisherJedis.publish(pubsubChannel, payload); + } catch (IOException e) { + LOGGER.warn("Broadcast failed", e); + } + } + + private void handleMessage(BroadcastMessage message) { + if (message.getDevice() != null) { + listeners.forEach(listener -> listener.updateDevice(false, message.getDevice())); + } else if (message.getPosition() != null) { + listeners.forEach(listener -> listener.updatePosition(false, message.getPosition())); + } else if (message.getUserId() != null && message.getEvent() != null) { + listeners.forEach(listener -> listener.updateEvent(false, message.getUserId(), message.getEvent())); + } else if (message.getCommandDeviceId() != null) { + listeners.forEach(listener -> listener.updateCommand(false, message.getCommandDeviceId())); + } else if (message.getChanges() != null) { + var iterator = message.getChanges().entrySet().iterator(); + if (iterator.hasNext()) { + var first = iterator.next(); + if (iterator.hasNext()) { + var second = iterator.next(); + listeners.forEach(listener -> listener.invalidatePermission( + false, + Permission.getKeyClass(first.getKey()), first.getValue(), + Permission.getKeyClass(second.getKey()), second.getValue())); + } else { + listeners.forEach(listener -> listener.invalidateObject( + false, + Permission.getKeyClass(first.getKey()), first.getValue())); + } + } + } + } + + @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() { + subscriberJedis.subscribe(new JedisPubSub() { + @Override + public void onMessage(String channel, String message) { + try { + String[] parts = message.split(":", 2); + if (channel == pubsubChannel && parts.length == 2 && !id.equals(parts[0])) { + handleMessage(objectMapper.readValue(parts[1], BroadcastMessage.class)); + } + } catch (IOException e) { + LOGGER.warn("Broadcast handleMessage failed", e); + } + } + }, pubsubChannel); + + while (!service.isShutdown()) { + try { + Thread.sleep(1000); + } catch (InterruptedException e) { + break; + } + } + + try { + subscriberJedis.close(); + publisherJedis.close(); + } catch (Exception e) { + LOGGER.warn("Failed to close pubsub", e); + throw new RuntimeException(e); + } + } + }; + +} |