From: Stefan Mahlitz <stefan@...>
Date: 2006-01-27T04:54:47+09:00
Subject: Re: Can't rescue this (http-access2)

Horacio Sanson wrote:
> 
> I have a code like this
> 
> def connect(redirect=3)
> 
>     # Do we have a url to process do we?? if not simply return
>     if not @uri
>         return nil
>     end
> 
>     begin
>        @clnt = HTTPAccess2::Client.new()
>        @clnt.set_cookie_store("cookie.dat")
>        @resp = @clnt.get(@uri)
>        @code = @resp.status.to_s
>        @message = @resp.reason
>      rescue SocketError
>         @code = "404"
>         @message = "Not Found"
>     rescue Exception => e
>          puts "#{self.class} Exception connecting to #{@uri.to_s} : #{e.to_s}"
>         @code = "408"
>         @message = e.to_s
>     end
>     
>    @resp
> end
> 
> 
> 
> this works as expected but some times (not always) I get an error and the 
> scripts bails out.
> 
> c:/ruby/lib/ruby/site_ruby/1.8/http-access2.rb:1466:in `gets': Invalid 
> argument (Errno::EINVAL)
>         from c:/ruby/lib/ruby/site_ruby/1.8/http-access2.rb:1466:in 
> `parse_header'
>         from c:/ruby/lib/ruby/site_ruby/1.8/http-access2.rb:1464:in `timeout'
>         from c:/ruby/lib/ruby/1.8/timeout.rb:55:in `timeout'
>         from c:/ruby/lib/ruby/site_ruby/1.8/http-access2.rb:1464:in 
> `parse_header'
>         from c:/ruby/lib/ruby/site_ruby/1.8/http-access2.rb:1422:in 
> `read_header'
>         from c:/ruby/lib/ruby/site_ruby/1.8/http-access2.rb:1254:in 
> `get_status'
>         from c:/ruby/lib/ruby/site_ruby/1.8/http-access2.rb:466:in 
> `do_get_header'
>         from c:/ruby/lib/ruby/site_ruby/1.8/http-access2.rb:436:in 
> `do_get_block'
>          ... 6 levels...
>         from ./scrapper.rb:1000:in `start'
>         from ./scrapper.rb:984:in `each'
>         from ./scrapper.rb:984:in `start'
>         from main.rb:208
> 
>  
> 
> I think I am rescuing all possible things that could go wrong here so my 
> script should continue ignoring this error but the scripts stops.
> 
> How can I rescue this??

a simple

rescue => e

should work as Errno is derived from SystemCallError (which inherits
from StandardError).

See Pickaxe II page 108 for details.

Actually I don't know why catching Exception doesn't work.