Check if a site is still working

[dannybloe]

Howdee folks,

I have a couple of webservers running and at some point one of them was not working anymore so I thought it was about time to do some regular monitoring. Of course there are plenty solutions out there but I though: let's do it with dzVents. And... turns out it is very simple to do.

So, I started by creating a dummy switch 'mySiteA' that will represent the state of my website A. If the switch is Off then... well.. the site is down. I also create a switch 'testSite' so I can manually trigger a test. Then I created this script:

Code: Select all

return {
	on = {
		timer = { 'at 09:00' },
		devices = { 'testSite' },
		httpResponses = { 'mySite'}
	}
	execute = function(domoticz, item)

		if (item.isTimer or item.isDevice) then 
			-- start the test
			domoticz.openURL({ url = 'http://mysite', callback = 'mySite', method = 'GET' })
		end
		
		if (item.isHTTPResponse) then 		    
			if (item.ok) then
				domoticz.email('Web server status', 'mySite is active', '[email protected]')
				domoticz.devices('mySite').switchOn()
			else
				domoticz.email('Web server status', 'mySite is down', '[email protected]')
				domoticz.devices('mySite').switchOff()
			end
		end
	end
}

Of course this is a simple test and it tests only one site. But you can test many sites like this and you can adjust the timer to check every hour or whatever. Also, in this case I do a simple GET request but you can also do POST requests for instance if you want to test if a contact form actually works. In the example above I test for for the ok response but you can inspect all response headers or the returned data.

Oh, and the switch mySite is just there so you can see in Domoticz the state of your site as well. In case you missed the email (you might create a script to test that as well if this is the case )

[sciurius]

Can you elaborate on this?

I'm still a novice as it comes to Domoticz scripting...

E.g. I would like to perform such a check periodically. How cna I do that?

[erem]

@sciurius

The

Code: Select all

timer = { 'at 09:00' },

is responsible for the recurrence.
for all timer options, look here: https://www.domoticz.com/wiki/DzVents:_ ... gger_rules

[sciurius]

Great, thanks!

[Wilco]

Hello,

1. i created a dummy switch
2. i created a new lua-script, with only your sample

and got this error

Error: EventSystem: in /home/pi/domoticz/scripts/lua/script_device_http.lua: /home/pi/domoticz/scripts/lua/script_device_http.lua:7: '}' expected (to close '{' at line 1) near 'execute'

what must i do?

Kind Regards
Wilco

[erem]

you most likely have an unmatched bracket in your code.

[Wilco]

Thanx for helping

i copied the sample code, where is the unmatched bracked? I don't see it.

[Maikel76]

Hello,

1. i created a dummy switch
2. i created a new lua-script, with only your sample

and got this error

Error: EventSystem: in /home/pi/domoticz/scripts/lua/script_device_http.lua: /home/pi/domoticz/scripts/lua/script_device_http.lua:7: '}' expected (to close '{' at line 1) near 'execute'

what must i do?

Kind Regards
Wilco

Wilco, Make a new dzVents script, not a lua script (you can choose that option too in the online editor)
Otherwise, make sure all { opening brackets are also closed with an closing bracket }

[Wilco]

also an error

2021-08-16 16:54:50.071 Error: dzVents: Error: (3.1.7) error loading module 'HTTP' from file '/home/pi/domoticz/scripts/dzVents/generated_scripts/HTTP.lua':
2021-08-16 16:54:50.071 ...e/pi/domoticz/scripts/dzVents/generated_scripts/HTTP.lua:7: '}' expected (to close '{' at line 1) near 'execute'

[waltervl]

I think the example script misses a comma

Code: Select all

}
	execute = function(domoticz, item)

should be

Code: Select all

},
	execute = function(domoticz, item)

[Wilco]

Thank you all,

what i want is very simpel:
- 1 dummy-device (type on/off)
- check (every hour) the http(s)-response
yes = dummy-device ON
no = dummy-device OFF

does someone have a lua-script?

[kiddigital]

Check the ‘HTTP(S) Poller’ hardware module.

For more info, read the Wiki page about it.

[Wilco]

Hello Kiddigital,

i saw that, but how to? can you give me a sample?