Contents

# frozen_string_literal: true

module GithubAuthentication
  module Retriable
    def with_retries(*exceptions, max_attempts: 4, sleep_between_attempts: 0.1, exponential_backoff: true)
      attempt = 1
      previous_failure = nil

      begin
        return_value = yield(attempt, previous_failure)
      rescue *exceptions => exception
        raise unless attempt < max_attempts

        sleep_after_attempt(
          attempt: attempt,
          base_sleep_time: sleep_between_attempts,
          exponential_backoff: exponential_backoff
        )

        attempt += 1
        previous_failure = exception
        retry
      else
        return_value
      end
    end

    private

    def sleep_after_attempt(attempt:, base_sleep_time:, exponential_backoff:)
      return unless base_sleep_time > 0

      time_to_sleep = if exponential_backoff
        calculate_exponential_backoff(attempt: attempt, base_sleep_time: base_sleep_time)
      else
        base_sleep_time
      end

      Kernel.sleep(time_to_sleep)
    end

    def calculate_exponential_backoff(attempt:, base_sleep_time:)
      # Double the max sleep time for every attempt (exponential backoff).
      # Randomize sleep time for more optimal request distribution.
      lower_bound = Float(base_sleep_time)
      upper_bound = lower_bound * (2 << (attempt - 2))
      Kernel.rand(lower_bound..upper_bound)
    end
  end
end

Version data entries

3 entries across 3 versions & 1 rubygems

Version	Path
github-authentication-1.0.2	lib/github_authentication/retriable.rb
github-authentication-1.0.1	lib/github_authentication/retriable.rb
github-authentication-1.0.0	lib/github_authentication/retriable.rb