From: Noah <noahd@...>
Date: 2004-02-21T12:44:52+09:00
Subject: Re: TCPserver client disconnect


"Joel VanderWerf" <vjoel@PATH.Berkeley.EDU> wrote in message
news:4036BF2A.1080606@path.berkeley.edu...
> Noah wrote:
> > "Joel VanderWerf" <vjoel@PATH.Berkeley.EDU> wrote in message
> > news:4036ACF4.9000007@path.berkeley.edu...
> >
> >>Noah wrote:
> >>
> >>>ruby newbie question...
> >>>
> >>>How can I detect when a client disconnects from a TCPserver?
> >>>I'm streaming data to the client in a while loop (Shoutcast-style mp3
> >>>stream), but I'm not sure what condition to test to see if the client
> >
> > drops
> >
> >>>out.
> >>
> >>Does sample/svr.rb (in the ruby distribution) help?
> >>
> >
> > Not really, because in that example, the server is checking for the
client
> > eof, right?  (Correct me if I'm wrong. I just started with Ruby a few
days
> > ago.)
> >
> > In my application, the client makes one initial request, and then simply
> > receives.  The server is the only one sending data.  It's like a HTTP
> > request.  Imagine a client does a GET on a very large file.  The server
> > begins to send the data, but the client drops out half-way through.  How
can
> > the server detect this and cancel the transfer?
>
> Errno::ECONNRESET seems to be the exception raised. At least on linux.
>
> In samples/svr.rb, I replaced
>
>   s.write(str)
>
> with
>
>   s.write(str*10_000)
>
> and ran samples/clnt.rb as usual. When the client is interrupted, the
> server receives:
>
> svr.rb:27:in `write': Connection reset by peer (Errno::ECONNRESET)
>          from svr.rb:27
>          from svr.rb:15:in `each'
>          from svr.rb:15
>          from svr.rb:12:in `loop'
>          from svr.rb:12
>
Ah, it turns out I was generating that exception, but I couldn't see it
because it was jumping to an 'ensure' block, and I guess the thread would
just die.  I moved the s.close into the ensure block and now it's working
great.

Thanks for the help.