From: Torsten Schmidt <torstello@...>
Date: 2005-12-02T21:47:51+09:00
Subject: Re: url-monitoring script question

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Hi @all,

i'll be back with an issue of my web-monitoring-script.

yesterday i got the following email from my cron-daemon:

/usr/lib/ruby/1.8/net/protocol.rb:83:in `initialize': Connection refused -
connect(2) (Errno::ECONNREFUSED)
    from /usr/lib/ruby/1.8/net/protocol.rb:83:in `new'
    from /usr/lib/ruby/1.8/net/protocol.rb:83:in `connect'
    from /usr/lib/ruby/1.8/net/protocol.rb:82:in `timeout'
    from /usr/lib/ruby/1.8/timeout.rb:55:in `timeout'
    from /usr/lib/ruby/1.8/net/protocol.rb:82:in `connect'
    from /usr/lib/ruby/1.8/net/protocol.rb:64:in `initialize'
    from /usr/lib/ruby/1.8/net/http.rb:430:in `open'
    from /usr/lib/ruby/1.8/net/http.rb:430:in `do_start'
    from /usr/lib/ruby/1.8/net/http.rb:419:in `start'
    from /usr/lib/ruby/1.8/net/http.rb:296:in `get_by_uri'
    from /usr/lib/ruby/1.8/net/http.rb:282:in `get_response'
    from /usr/local/bin/webcattest/WebCatMonitoring.rb:34
    from /usr/local/bin/webcattest/WebCatMonitoring.rb:32:in `each'
    from /usr/local/bin/webcattest/WebCatMonitoring.rb:32


i was able to handle a timeout-error, but the error above was not handled.

Unfortunately i don't know how to reproduce the connection-refused error
where i can test my new rescue method:
see rescue Exception =3D> err

-------------------------------------------------------------------
require 'net/smtp'
require 'net/http'

apps =3D [
  { :name =3D> 'url-test',         :url =3D> 'test/url' },
#...
]
for app in apps
  app[:url] =3D URI.parse("http://#{app[:url]}")
end

errors =3D []

for app in apps.sort { rand }
  begin
    res =3D Net::HTTP.get_response(app[:url])

    error =3D nil
    if %w[ 301 302 ].include?res.response.code
      res =3D Net::HTTP.get_response( URI.parse(res.header["location"] ))
    end
    if res.response.code.to_i !=3D 200
      error =3D ["<h2>#{app[:name]}</h2><p> error code: #{res.response.code
}</p>"]
#...
      errors << error
    end
  rescue Timeout::Error =3D> err
    errors << error =3D ["Timeout Error: #{app[:name]} not reachable!"]
  rescue Exception =3D> exception
    errors << "<p></p><strong>#{app[:name]}</strong> with #{app[:url]}
</strong>not reachable!<br/><pre>#{exception.message}</pre>"
  end
 end
# handling Emails...
-------------------------------------------------------------------

Any ideas how to reproduce a connection-refused error or suggestions if  my
rescue Exception can handle this?

(sorry for my bad english)

Regards,
Torsten

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