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/*
* Copyright 2020 - 2024 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.schedule;
import com.sun.jna.Library;
import com.sun.jna.Native;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.traccar.config.Config;
import org.traccar.config.Keys;
import jakarta.inject.Inject;
import jakarta.ws.rs.client.Client;
import org.traccar.database.StatisticsManager;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
public class TaskHealthCheck implements ScheduleTask {
private static final Logger LOGGER = LoggerFactory.getLogger(TaskHealthCheck.class);
private final Config config;
private final Client client;
private final StatisticsManager statisticsManager;
private final long gracePeriod = System.currentTimeMillis() + TimeUnit.HOURS.toMillis(1);
private SystemD systemD;
private boolean enabled;
private long period;
private double dropThreshold;
private int messageLastTotal;
private int messageLastPeriod;
@Inject
public TaskHealthCheck(Config config, Client client, StatisticsManager statisticsManager) {
this.config = config;
this.client = client;
this.statisticsManager = statisticsManager;
if (!config.getBoolean(Keys.WEB_DISABLE_HEALTH_CHECK)
&& System.getProperty("os.name").toLowerCase().startsWith("linux")) {
try {
systemD = Native.load("systemd", SystemD.class);
String watchdogTimer = System.getenv("WATCHDOG_USEC");
if (watchdogTimer != null && !watchdogTimer.isEmpty()) {
period = Long.parseLong(watchdogTimer) / 1000 * 4 / 5;
}
if (period > 0) {
LOGGER.info("Health check enabled with period {}", period);
dropThreshold = config.getDouble(Keys.WEB_HEALTH_CHECK_DROP_THRESHOLD);
enabled = true;
}
} catch (UnsatisfiedLinkError e) {
LOGGER.warn("No systemd support", e);
}
}
}
private String getUrl() {
String address = config.getString(Keys.WEB_ADDRESS, "localhost");
int port = config.getInteger(Keys.WEB_PORT);
return "http://" + address + ":" + port + "/api/server";
}
@Override
public void schedule(ScheduledExecutorService executor) {
if (enabled) {
executor.scheduleAtFixedRate(this, period, period, TimeUnit.MILLISECONDS);
}
}
@Override
public void run() {
LOGGER.debug("Health check running");
if (System.currentTimeMillis() > gracePeriod) {
boolean success = true;
int status = client.target(getUrl()).request().get().getStatus();
if (status != 200) {
success = false;
LOGGER.warn("Web health check failed with status {}", status);
}
int messageCurrentTotal = statisticsManager.messageStoredCount();
int messageCurrentPeriod = messageCurrentTotal - messageLastTotal;
if (dropThreshold > 0 && messageLastPeriod > 0) {
double drop = messageCurrentPeriod / (double) messageLastPeriod;
if (drop < dropThreshold) {
success = false;
LOGGER.warn("Message health check failed with drop {}", drop);
}
}
messageLastTotal = messageCurrentTotal;
messageLastPeriod = messageCurrentPeriod;
if (success) {
notifyWatchdog();
}
} else {
notifyWatchdog();
}
}
private void notifyWatchdog() {
int result = systemD.sd_notify(0, "WATCHDOG=1");
if (result < 0) {
LOGGER.warn("Health check notify error {}", result);
}
}
interface SystemD extends Library {
@SuppressWarnings("checkstyle:MethodName")
int sd_notify(@SuppressWarnings("checkstyle:ParameterName") int unset_environment, String state);
}
}
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