From: Joel VanderWerf <vjoel@...>
Date: 2004-02-21T11:15:14+09:00
Subject: Re: TCPserver client disconnect

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