From: Marcelo <marcelo.magallon@...>
Date: 2010-02-23T04:13:28+09:00
Subject: Re: Ruby Idiom To Retry open() Upto N Times Before Giving Up

On Mon, Feb 22, 2010 at 12:53, Dan <dandiebolt@yahoo.com> wrote:

> 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.

Something along the lines of:

def open_with_retry(url, n=10, delay=1)
    1.upto(n) do
        begin
            open(url) do |handle|
                yield handle
            end
            break
        rescue
            puts "Sleeping ..."
            sleep delay
        end
    end
end

open_with_retry('http://does.not.resolve.tld/', 5, 2) do |h|
    puts "Doing something with #{h.inspect}"
end

Note that this sleeps even if the last attempt failed.

Marcelo