openHAB uptime in an item

Tutorials & Examples Solutions
1

This is how I grep the time since start of openHAB service.

Based on a bash file, @Udo_Hartmann created in a discussion in the german community.

By the way: sorry for perfect “denglish” in naming the varibles :wink:

.things: (don’t forget to whitelist!)

Thing exec:command:OH_uptime    "opebHAB uptime"        [command="systemctl status openhab.service | grep since", interval=30]

. items:

String      OH_UptimeText     "Uptime"                              
String      UptimeRaw            {channel="exec:command:OH_uptime:output" [profile="transform:REGEX",function=".*([0-9]{4}-[0-9]{2}-[0-9]{2} ([0-9]+(:[0-9]+)+) [A-Z]+).*"]}

.rules:

rule "openHAB uptime formatieren"
when
    Item UptimeRaw received update
then
    val input    = newState.toString.split(" ")
    val datum    = input.get(0)
    val uhrzeit  = input.get(1)
    val tz       = input.get(2)
    var st       = "+0100"
    if (tz == "CEST") st = "+0200"
    val dtOnline = DateTimeType.valueOf(datum + "T" + uhrzeit + st)
    val uptime   = Duration.between(dtOnline.getZonedDateTime(ZoneId.systemDefault), now).toSeconds
    val Minutes  = (uptime / 60) % 60
    val Hours    = (uptime / 60 / 60) % 24
    val Days     = (uptime / 60 / 60 / 24).intValue
    var zeit     = Days.toString + " Tage "
    switch Days.intValue {
      case 0 : zeit = ""
      case 1 : zeit = "1 Tag " }
    zeit += Hours.toString + " Std. " + Minutes.toString + " Min. "
    OH_UptimeText.postUpdate(zeit) 
end
2

Just for your information - there is also a rest api endpoint that returns the uptime in seconds.

1 Like
3

I use the “Systeminfo” Binding for this. There is a channel that is called “uptime” (of the system of course).

1 Like
4

But wouldn’t that be the system uptime?
OPs script and the rest api return the openHAB uptime.

5

Yes, the ideas was not to get system uptime but OH’s uptime.

6

Oh, I didn’t kown this yet.

Found it:

curl -X 'GET'   'http://192.168.178.60:8080/rest/systeminfo'   -H 'accept: application/json'   -H 'Authorization: Bearer .........

Thanks for the hint!

7

Java provides this information. See java - time since JVM started - Stack Overflow

In JRuby:

logger.info java.lang.management.ManagementFactory.runtime_mx_bean.uptime # in milliseconds

# Convert it to a Duration object:
uptime_duration = java.lang.management.ManagementFactory.runtime_mx_bean.uptime.milliseconds
logger.info uptime_duration

logger.info "openHAB was started less than an hour ago" if uptime_duration < 1.hour
1 Like
8

That’s definitively the leanest approach!

Modified it for DSL rules:

val uptime = (java.lang.management.ManagementFactory.getRuntimeMXBean.getUptime / 1000).intValue
9

I think DSL lets you write it as

java.lang.management.ManagementFactory.runtimeMXBean.uptime
10

Yes, but for me it is the same :slight_smile:
There is no reason for me to only restart OpenHab.
When I do a system update I also restart the whole system to finalize the procedure and see that everything comes up properly.

11

both do it.

12

A couple other ways to get the openHAB uptime:

  • MainUI → Help & About → View Details → Uptime

  • Create a simple rule that triggers at a system runtime level and post an update to a DateTime Item. You can use and expression like =dayjs(items.SystemStart.state).fromNow() in a MainUI widget and you’ll get a text like “3 days ago”. This will give you how long OH has been operational, not just when it was started.

1 Like
13

Yes, obviously there are many roads that lead to Rome.

The approach “systemstart” have I tried before but rejected it, because it triggers again when editing rules.

I’m now fine with java.lang.management… The only thing is where to get this knowlegde from.
I think, this is not run-of-the-mill.

14

Is there also a way to use that with a js rule? :upside_down_face:

15

This gives you the uptime in seconds:

var uptime = java.lang.management.ManagementFactory.getRuntimeMXBean().getUptime() / 1000;
16

In JS:

Java.type("java.lang.management.ManagementFactory").getRuntimeMXBean().getUptime()