> LçÉettçËäº Mark Probert <probertm / acm.org>
> Aihe: Re: Really confused about exceptions now
> 
> Hi .. 
> 
>  On Thursday 10 February 2005 13:25, Gennady Bystritksy wrote:
> >
> > When you do not have explicit "return" statement in your rescue, the
> > execution falls down to the end of the method and returns whatever the
> > last executed statement had returned (FYI: puts() returns nil).
> >
> Thank you.  So, a more correct version of the method is:
> 
>   def alive?
>       begin
>           t = TCPSocket.new(@host, @port)  ### line 143
>           return true
>           
>       rescue Errno::ETIMEDOUT
>           @exception = " Timed out (#{@host}:#{@port})"
>       rescue SocketError => e
>           @exception = " Socket error - #{e}"
>       rescue Exception => e
>           @exception = e
>       end
>       return false
>   end

Just for clarity, you could restructure that one more time :)

def alive?
  begin
    t = TCPSocket.new(@host, @port)  ### line 143

  rescue Errno::ETIMEDOUT
    @exception = " Timed out (#{@host}:#{@port})"
    false
  rescue SocketError => e
    @exception = " Socket error - #{e}"
    false
  rescue Exception => e
    @exception = e
    false

  # Alive!
  else
    true

  # Clean up
  ensure
    # Close the socket if it's open
  end
end


> However, I still have the problem that this works in my test harness and not 
> in my actual code at the TCPSocket() call:
> 
> 
>  14:30 (kant)$ ruby test.rb
>   .. trying to go to Foo (Foo:10.10.10.5:foo:bar)
>   -->  failed  Foo:10.10.10.5:foo:bar
>   .. trying to go to Foo (Foo:10.10.10.5:foo:bar)
>   -->  failed  Foo:10.10.10.5:foo:bar
> 
>  14:31 (kant)$ ruby healthcollect.rb -g -n eeua.txt -c flow.txt -d data
>   .. Running 10 commands on 2 nodes.
>   .. processing the nodes... (thread count=35)
>   .. threading now ...
>   .. trying to go to Foo (Foo:10.10.10.5:foo:bar)
>  Exception `SocketError' at ./bsn_a.rb:143 - getaddrinfo: hostname nor
>    servname provided, or not known
>   -->  failed  Foo:10.10.10.5:foo:bar
>   .. trying to go to Bar (Bar:10.10.10.6:foo:bar)
>  Exception `SocketError' at ./bsn_a.rb:143 - getaddrinfo: hostname nor
>    servname provided, or not known
>   -->  failed  Bar:10.10.10.6:foo:bar
> 
> 
> I have no idea as to why the SocketError would be caught in one case and not 
> the other.

Are you doing anything else with 't' at all? Or maybe a duplicate 
file you're including? You might work around it by doing 
BasicSocket.do_not_reverse_lookup = true?

> Regards,
> 
> -- 
> -mark.  (probertm at acm dot org)

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