From: Dave Baldwin <dave.baldwin@3dlabs.com>
Date: 2005-11-21T19:56:58+09:00
Subject: Re: url-monitoring script question


On 21 Nov 2005, at 10:44, Torsten Schmidt wrote:

> Thanks for the input so far.
>
> another possible solution come to my (ruby-beginner) mind instead  
> of writing
> the status-code to a seperate file and parse it:
>
> some kind of deamon-process:
> what about to put something like 'sleep 300' in the script to make an
> indefinetly loop.
> so it's easier to store the exit-code of the http-requests and  
> compare them.
>
> with this it would be possible to send 5 error-emails (25 min) and  
> after
> that, send another email when the url 'recovers'.
>
> What are your opinions for that solution?
>
> Torsten
>
> 2005/11/21, Heiko Leberer <ihspm@haleb.de>:
>>
>> If the number of sites is known, you could keep a file for all sites
>> and the related status (e.g. one line per site)
>>
>> mysite.mydomain.org <http://mysite.mydomain.org>: ok
>> could mean, last run the site could be accessed
>> mysite.mydomain.org <http://mysite.mydomain.org>: 2
>> could mean, site not accesible for two consecutive tries
>>
>> Therefore, compare your findings against the file, send an email  
>> if 1<=
>> errcount<=3, and update the file afterwards (incrementing or  
>> resetting
>> the error count)
>>

I had a need recently to monitor my internet connection at home.   
This is the ruby program I wrote to do it.  It just keeps track of  
the on line and off line time in a terminal window.

require 'open-uri.rb'

onAt = Time.now
offAt = Time.now
online = false
working = true

puts "Log starting at #{Time.now}"

def printTime (text, start)
	dur = Time.now - start
	hours = (dur / 3600).to_i
	minutes = (dur / 60).to_i - hours * 60
	print "#{text} #{start}, for #{hours} hours and #{minutes} minutes"
	$stdout.flush			
end

while true
	working = false
	3.times do
		begin
			ans = open("http://www.google.com/").read
			working = true
			break
		rescue Timeout::Error, StandardError
		end
	end
	if !online && working
		onAt = Time.now
		online = true
		printTime("\nOn line at", onAt)
	elsif !online && !working
		printTime("\rOff line at", offAt)
	elsif online && working
		printTime("\rOn line at", onAt)
	else online && !working
		offAt = Time.now
		online = false
		printTime("\nOff line at", offAt)
	end
	sleep 10
end