Converting Prometheus to Openhab

1

Hi,

I have this output from an AirGradient sensor:

$ curl http://airgradient-ip-address:9926/metrics
# HELP pm02 Particulate Matter PM2.5 value
# TYPE pm02 gauge
pm02{id="Airgradient"}6
# HELP rco2 CO2 value, in ppm
# TYPE rco2 gauge
rco2{id="Airgradient"}862
# HELP atmp Temperature, in degrees Celsius
# TYPE atmp gauge
atmp{id="Airgradient"}31.6
# HELP rhum Relative humidity, in percent
# TYPE rhum gauge
rhum{id="Airgradient"}38

I have this thing:

Thing http:url:airgradient1 "Airgradient 1" [
	baseURL="http://10.0.15.87:9926/metrics",
	refresh=30] {
		Channels:
			Type string : hum "Humidity" [ stateTransformation="REGEX:.*rhum.*}([0-9]*)" ]
            Type string : temp "Temperature" [ stateTransformation="REGEX:.*atmp.*}([0-9.]*).*"]
            Type string : co2 "CO2" [ stateTransformation="REGEX:.*rco2.*}([0-9.]*).*"]
            Type string : pm02 "PM02" [ stateTransformation="REGEX:.*pm02.*}([0-9.]*).*"]
}

All the regex match in the regex tester:

Sadly OH3 does not seem to agree:

2021-12-18 22:59:55.408 [WARN ] [.transform.SingleValueTransformation] - Transformation service REGEX for pattern .*pm02.*}([0-9.]*).* not found!
2021-12-18 22:59:55.409 [WARN ] [.transform.SingleValueTransformation] - Transformation service REGEX for pattern .*atmp.*}([0-9.]*).* not found!
2021-12-18 22:59:55.409 [WARN ] [.transform.SingleValueTransformation] - Transformation service REGEX for pattern .*rhum.*}([0-9]*) not found!
2021-12-18 22:59:55.409 [WARN ] [.transform.SingleValueTransformation] - Transformation service REGEX for pattern .*rco2.*}([0-9.]*).* not found!

Any ideas?

Daniel

2

wouldn’t that be the first match for “pm02”?

3

even if so (it isn’t in the regex tester). the “}” limits it to the right number.
Doesn’t it?

4

I reprogrammed the Airgradient to output JSON.
JSONPATH works. REGEX seems broken

5

Looks like the optional add-on is not installed.

Doesn’t appear to.
I find experimenting with transforms in rules is convenient.

val rawtext = '# HELP pm02 Particulate Matter PM2.5 value
# TYPE pm02 gauge
pm02{id="Airgradient"}6
# HELP rco2 CO2 value, in ppm
# TYPE rco2 gauge
rco2{id="Airgradient"}862
# HELP atmp Temperature, in degrees Celsius
# TYPE atmp gauge
atmp{id="Airgradient"}31.6
# HELP rhum Relative humidity, in percent
# TYPE rhum gauge
rhum{id="Airgradient"}38'
var results = transform("REGEX", ".*pm02.*}([0-9.]*).*", rawtext)
logInfo("test", "extracts " + results)

yields

2021-12-19 15:09:50.382 [INFO ] [.eclipse.smarthome.model.script.test] - extracts 38

I don’t think that’s quite what you wanted? I don’t know regex well enough to correct.

6

Hi Rossko,

This was it. Thanks for the hint!

Daniel

7

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