[racket] tcp-read handlers

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Btw, forgot to ask, any alternatives that could solve my problem in
the short term?

Again, thanks for the attention.

On 01/18/2014 02:18 PM, Matthias Felleisen wrote:
> 
> To supplement Matthew's response, see exn style:
> 
> http://plt.eecs.northwestern.edu/snapshots/current/doc/style/Choosing_the_Right_Construct.html#%28part._.Exceptions%29
>
>  This does not address the problem part.
> 
> On Jan 18, 2014, at 11:04 AM, Matthew Flatt wrote:
> 
>> The `exn?` predicate would catch all exceptions from the base 
>> libraries.[*]
>> 
>> I think the problem may be that the underlying TCP port is read
>> in a separate decoding thread, and so the exception and printing
>> happens in that thread. If I'm right, then that seems like a flaw
>> in our implementation of decoding.
>> 
>> [*] To avoid interfering with the `exn:break?` exceptions
>> triggered by Ctl-C, you almost always want `exn:fail?` instead of
>> just `exn?`.
>> 
>> At Sat, 18 Jan 2014 09:50:15 -0200, Eduardo Bellani wrote:
> Is there a way to install a handler for the tcp-error exception? I
> have a function like this
> 
> (define (get-page link-url (max-tries 5)) (let loop ([current-try
> 0]) (with-handlers ([exn? (? (e) (if (> current-try max-tries) 
> (error 'get-page "failed because it exceeded ~a tries" max-tries) 
> (begin (sleep 2) (loop (add1 current-try)))))]) (get-pure-port
> link-url))))
> 
> that I'm using to crawl some data, but sometimes it's printing:
> 
> tcp-read: error reading system error: Connection reset by peer;
> errno=104 context...: /usr/racket/collects/net/url.rkt:392:3
> 
> Thanks for the attention.
> 
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> 

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