EasyRetry

Easily retry a block of code a predetermined number of times.

Easy Retry adds a #tries method to the Numeric class. The #tries method takes a block of code and will retry the block a number of times equal to the number the method is called on. It also aliases #try to #tries in the odd case that you want to (~re~?)try a block of code only once.

Installation

Add this line to your application's Gemfile:

gem 'easy_retry'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install easy_retry

Usage

If you're not using Bundler, you'll need to require the gem in your code:

  require 'easy_retry'

Basic Example

  4.tries do |try|
    raise 'Something went wrong' if try < 4
    puts "Success!"
  end

The code above will produce the following output:

  Error: Something went wrong (1/4)
  Error: Something went wrong (2/4)
  Error: Something went wrong (3/4)
  Success!

Only Retry on Certain Exceptions

Sometimes you want to only retry your code if a specific exception is raised. You can do this by passing a list of exceptions to the #tries method:

  4.tries(rescue_from: [ZeroDivisionError, ArgumentError]) do |try|
    raise ZeroDivisionError if try < 2
    raise ActiveRecord::RecordInvalid if try < 4
    puts "Success!"
  end

The code above will not rescue from the ActiveRecord::RecordInvalid error and produce the following output:

  Error: ZeroDivisionError (1/4)
  ActiveRecord::RecordInvalid: Record invalid
  from (pry):16:in `block in __pry__'

Retry delay

The delay for each retry is based on the iteration count. The delay after each failed attempt is n^2, where n is the current iteration that failed. E.g. after the first try, EasyRetry waits 1 second, after the second try it waits 4 seconds, then 9, then 16, then 25, then 36, etc.

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and the created tag, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/[USERNAME]/easy_retry. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the code of conduct.

License

The gem is available as open source under the terms of the MIT License.

Code of Conduct

Everyone interacting in the EasyRetry project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.