A thin wrapper for begin + rescue + sleep + retry.

gem install attempt

gem cert --add <(curl -Ls https://raw.githubusercontent.com/djberg96/attempt/main/certs/djberg96_pub.pem)

require 'attempt'
 
# Attempt to ftp to some host, trying 3 times with 30 seconds between
# attempts before finally raising an error.

attempt(tries: 3, interval: 30){
  Net::FTP.open(host, user, passwd){ ... }
}
 
# Or, do things the long way...
code = Attempt.new do |a|
  a.tries    = 3
  a.interval = 30
end
 
code.attempt{
  Net::FTP.open(host, user, passwd){ ... }
}

None that I'm aware of. If you find any bugs, please log them on the project page at:

https://github.com/djberg96/attempt

Use with caution. Specifically, make sure you aren't inadvertantly wrapping code that already performs sleep + retry. Otherwise, you'll end up with a series of nested retry's that could take much longer to work than you expect.

Also, this library uses the timeout library internally, which has some known issues. See Future Plans, below.

As of version 0.3.0, this library requires structured_warnings 0.3.0 or later. This is necessary because of changes in Ruby 2.4.

Update: I've switched from the timeout library in the standard library to the safe_timeout library on non-Windows platforms which should improve things. In addition, the structured_warnings library requirement is now 0.4.0 or later in order to work with Ruby 2.7.

Add the ability to set an absolute maximum number of seconds to prevent nested sleep/retry from delaying attempts longer than expected.

Replace the timeout library with a self selecting pipe if possible.

This library is partially based on Mark Fowler's 'Attempt' Perl module.

If you're looking for a heavier but more robust solution designed for remote services, please take a look at gems like "circuitbox" or "faulty".

This package is provided "as is" and without any express or implied warranties, including, without limitation, the implied warranties of merchantability and fitness for a particular purpose.

Apache-2.0

(C) 2006-2022, Daniel J. Berger All Rights Reserved

Daniel J. Berger