1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
|
/*
* 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 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 long gracePeriod = System.currentTimeMillis() + TimeUnit.HOURS.toMillis(1);
private SystemD systemD;
private boolean enabled;
private long period;
@Inject
public TaskHealthCheck(Config config, Client client) {
this.config = config;
this.client = client;
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);
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) {
int status = client.target(getUrl()).request().get().getStatus();
if (status == 200) {
notifyWatchdog();
} else {
LOGGER.warn("Health check failed with status {}", status);
}
} 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);
}
}
|
