From: Daniel Berger <djberg96@...>
Date: 2010-02-23T04:39:19+09:00
Subject: Re: Ruby Idiom To Retry open() Upto N Times Before Giving Up



On Feb 22, 11:53 am, Dan <dandieb...@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.

gem install attempt

# Try twice, 10 seconds apart
attempt(2, 10){
  open('http://www.example.com/foo.html')
}

Regards,

Dan