From: Rick DeNatale <rick.denatale@...>
Date: 2010-02-23T04:24:15+09:00
Subject: Re: Ruby Idiom To Retry open() Upto N Times Before Giving Up

On Mon, Feb 22, 2010 at 1:53 PM, Dan <dandiebolt@yahoo.com> wrote:
> I write a lot of scripts that I run once or infrequently that uses open-rui. Occasionally I run into a web site that times out or is unavailable for a period of time. My normal solution is to just rerun the script manually at a later time and the problem goes away. What I would like to start doing is rescuing the open() and retrying the open() after a delay. What would be the most idiomatic way to try opening a url say n times before giving up? Here is my crude code for trying twice:
>
> begin
>    open("http://www.example.com/foo.html")
>  rescue
>    begin
>       open("http://www.example.com/foo.html")
>     rescue
>       #tried twice - giving up
>    end
> end
>
> I would like a more general approach using ruby idioms where I could specify the maximum number of attempts and delay before giving up. Thanks for your help.
>

begin
  raise "oops"
rescue
  retry_count = (retry_count || 0) + 1
  puts "retry #{retry_count}"
  retry unless retry_count >= 5
end


-- 
Rick DeNatale

Blog: http://talklikeaduck.denhaven2.com/
Twitter: http://twitter.com/RickDeNatale
WWR: http://www.workingwithrails.com/person/9021-rick-denatale
LinkedIn: http://www.linkedin.com/in/rickdenatale