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-rw-r--r--src/main/java/org/traccar/api/HealthCheckService.java90
1 files changed, 90 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/api/HealthCheckService.java b/src/main/java/org/traccar/api/HealthCheckService.java
new file mode 100644
index 000000000..cd2856dfa
--- /dev/null
+++ b/src/main/java/org/traccar/api/HealthCheckService.java
@@ -0,0 +1,90 @@
+/*
+ * Copyright 2020 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.api;
+
+import com.sun.jna.Library;
+import com.sun.jna.Native;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.traccar.Context;
+
+import java.util.TimerTask;
+
+public class HealthCheckService {
+
+ private static final Logger LOGGER = LoggerFactory.getLogger(HealthCheckService.class);
+
+ private SystemD systemD;
+
+ private boolean enabled;
+ private long period;
+
+ public HealthCheckService() {
+ if (Context.getConfig().getBoolean("web.healthCheck")
+ && 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);
+ enabled = true;
+ }
+ } catch (UnsatisfiedLinkError e) {
+ LOGGER.warn("No systemd support", e);
+ }
+ }
+ }
+
+ public boolean isEnabled() {
+ return enabled;
+ }
+
+ public long getPeriod() {
+ return period;
+ }
+
+ private String getUrl() {
+ String address = Context.getConfig().getString("web.address", "localhost");
+ int port = Context.getConfig().getInteger("web.port", 8082);
+ return "http://" + address + ":" + port + "/api/server";
+ }
+
+ public TimerTask createTask() {
+ return new TimerTask() {
+ @Override
+ public void run() {
+ LOGGER.debug("Health check running");
+ int status = Context.getClient().target(getUrl()).request().get().getStatus();
+ if (status == 200) {
+ int result = systemD.sd_notify(0, "WATCHDOG=1");
+ if (result < 0) {
+ LOGGER.warn("Health check notify error {}", result);
+ }
+ } else {
+ LOGGER.warn("Health check failed with status {}", status);
+ }
+ }
+ };
+ }
+
+ interface SystemD extends Library {
+ int sd_notify(int unset_environment, String state);
+ }
+
+}