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comp.lang.ruby

Monitoring Socket Disconnect during gets or readline

Jon Fi

10/2/2006 2:47:00 PM

Hello... I am writing a simple chat program, but i have encountered a
problem. I ask for a client to provide a handle, but it he disconnects
during a gets call, it does weird things.

[code]
def get_handle(session)
for attempt in (0..2)
session.print "Please Login\n"

response=session.gets.strip # The problem

re=/(Login)\s(.+)/
md=re.match(response)
response=md[2]
if(!@socketHash.has_value?(response)) # This just checks to make
sure the handle isn't in use.
return response
else
session.print "Handle alerady in use... "
end
end
end
[/code]

If the client disconnects at this point, ruby seems to be still waiting
for a response. Also, sometimes it sends ruby's processor usage to 100%.

Is there a better way to do this? Or is there a way to give gets a
timeout? Thanks!
-Jon

--
Posted via http://www.ruby-....
2 Answers

Paul Lutus

10/3/2006 12:48:00 AM

0

Jon Fi wrote:

> Hello... I am writing a simple chat program, but i have encountered a
> problem. I ask for a client to provide a handle, but it he disconnects
> during a gets call, it does weird things.

/...

> If the client disconnects at this point, ruby seems to be still waiting
> for a response. Also, sometimes it sends ruby's processor usage to 100%.
>
> Is there a better way to do this? Or is there a way to give gets a
> timeout? Thanks!

IO#gets blocks forever if the input goes away, while IO#readline throws an
exception on EOF. I think your situation qualifies as an EOF. Why not try
it?

--
Paul Lutus
http://www.ara...

hemant

10/3/2006 12:45:00 PM

0

On 10/3/06, Paul Lutus <nospam@nosite.zzz> wrote:
> IO#gets blocks forever if the input goes away, while IO#readline throws an
> exception on EOF. I think your situation qualifies as an EOF. Why not try
> it?
>

Use Eventmachine (http://rubyforge.org/projects/ev...).

The thing...you need for painless network programming in ruby.

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