From: Toby Rodwell <trodwell@...>
Date: 2010-01-26T08:25:45+09:00
Subject: Re: Problems with Telnet

Sean Warburton wrote:
> Firstly I'm a total newbie not just to Ruby but programming full stop so
> go gentle, please :)
> 
> I'm looking for some help with a telnet problem. I am using a service
> that uses telnet to let you check the registration status of a domain
> name, you can only make so many requests per day so the maximum rate you
> can send requests at is every 200ms. You also have to keep the
> connection open as it takes 3 seconds to open a connection, each name
> has to be followed by a carriage return and new line and finally the
> final request needs to finish with #exit. The problem I have is this ...
> 
> I can open a connection no problem and if I send the following command
> 
> cmd("domain1.ca\r\ndomain2.ca\r\n#exit") {|str| print str}
> 
> I get the information I need returned for both domains but because I
> need to wait 200ms between each domain, I need to actually send ...
> 
> cmd("domain1.ca\r\n"){|str| print str}
> sleep 0.2
> cmd("domain2.ca\r\n#exit"){|str| print str}
> 
> When I do that I get the correct information for the first domain then
> it sits for a couple of seconds before returning a timed out error.
> 
> Can anyone point to what I'm doing wrong and also give me some pointers
> on the best way to read and chomp the replies from the service.
> 
> TIA
> 
> Sean

Do you *have* to wait 200ms between consecutive requests?  If the 'sleep 
0.2' is causing problems could you burst a group of requests, followed 
by a longer pause, followed by another grouped request eg
cmd("domain1.ca\r\n...domain5.ca\r\n#exit") {|str| print str}
sleep 1
cmd("domain6.ca\r\n...domain10.ca\r\n#exit") {|str| print str}
etc

(It's all I can offer - like you I'm a network engineer not a 
programmer!)
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