Net::Telnet

Ruby
1

I’ve got an issue with following code:

t.cmd('String' => "iptables -t mangle -L", 'Match' => /\#/, 'Timeout' => 15 ) { |c| 
      print c
      sleep 1               #THIS IS AN ISSUE I CAN'T UNDERSTAND

      if c =~ patternDup    #patternDup is RegExp object
           rtrnMsg = "DUPLICATED"
           iptblsLog.info(c.to_s)
      elsif c =~ patternRules   #patternRules is RegExp object
           rtrnMsg = "RULES"
           iptblsLog.info(c.to_s)
      else
           rtrnMsg = "NO RULES"
           iptblsLog.info(c.to_s)
      end #if

}

Without sleep sometimes comparison c with particular RegExp doesn’t
work. It isn’t due to that regular expression doesn’t match string
compared with.
After adding the sleep everything works well.

Please, help me to understand it. Why adding sleep resolved this issue.
Thanks in advance.

2

Marcin T. wrote:

      if c =~ patternDup    #patternDup is RegExp object

}

Without sleep sometimes comparison c with particular RegExp doesn’t
work. It isn’t due to that regular expression doesn’t match string
compared with.
After adding the sleep everything works well.
It sounds to me like either c or the regexp are modified by a different
thread, but without knowing where they come from (or, indeed, what t is
and what cmd is supposed to yield), it’s difficult to guess any more…

3

Alex Y. wrote:

Marcin T. wrote:

      if c =~ patternDup    #patternDup is RegExp object

}

Without sleep sometimes comparison c with particular RegExp doesn’t
work. It isn’t due to that regular expression doesn’t match string
compared with.
After adding the sleep everything works well.
It sounds to me like either c or the regexp are modified by a different
thread, but without knowing where they come from (or, indeed, what t is
and what cmd is supposed to yield), it’s difficult to guess any more…

It’s impossible that it is due to modification of c variable in other
thread. This is local variable. So the regexp’s.
t is a Net::Telnet object. And I don’t know what cmd is supposed to
yield. Need to look into telnet.rb(???)