retry_upto.rb

retry_upto.rb

# Ruby `retry` with steroids:
#
# - retry up to 5 times without waiting between them and retrying after any exception
#
#     retry_upto(5) do ... end
#
# - retry up to 5 times, waiting 2 seconds between retries and retrying after any exception
#
#     retry_upto(5, :wait => 2) do ... end
#
# - retry up to 5 times, waiting 1 second initially and having increasing patience (2, 4, 8, ...)
#
#     retry_upto(5, :wait => 1, :patience => 2) do ... end
#
# - retry up to 5 times, waiting 1 second initially and having decreasing patience (0.5, 0.25, 0.125, ...)
#
#     retry_upto(5, :wait => 1, :patience => 0.5) do ... end
#
# - retry up to 5 times without waiting between retries, retrying only after a ZeroDivisionError
#
#     retry_upto(5, :rescue_only => ZeroDivisionError) do ... end
#
# - retry up to 5 times, waiting 2 seconds between retries, retrying only after a ZeroDivisionError
#
#     retry_upto(5, :wait => 2, :rescue_only => ZeroDivisionError) do ... end

def retry_upto(max_retries = 1, options = {})
  begin
    return yield if ((max_retries -= 1) > 0)
  rescue (options[:rescue_only] || Exception)
    sleep((options[:wait] || 0) * (options[:patience] || 1))
    retry
  end
  yield
end

Just some compact coding

nice!

mmm, this wouldn't make a cumulative series. If we pass in :wait => 1, :patience => 2, it should wait 2, 4, 8, 16...

but in your example it will wait 2, 2, 2, 2...