Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
did I stutter?
Ruby
branch: master

Merge pull request #4 from covermymeds/master

Pass exception from previous loop to block.
latest commit 441288956c
@schneems authored

README.md

rrrretry

Because retry was already taken.

Install

In your Gemfile add:

gem 'rrrretry'

Then run bundle install.

What Does it Do?

Monkey patches Enumerable to add a method called retry that attempts to run code for every element, returns the first valid run.

If code does not return, the original error will be raised.

Whoa Crazy! Give me an example:

Most people will use it for network communication like this:

10.times.retry do
  SomeNetworkCommunicationThingyHere.new
end

But if you prefer runnable examples check these out:

First run returns a divided by 0 error, so the next result is returned.

[0, 1, 2].each.retry { |i| 1/i }
  # => 1

If there are no valid returns, the last error will be raised.

[0, 1, 2].each.retry { raise "bar" }
  # => RuntimeError: bar

By default only StandardError is caught, multiple error types can be specified.

array = [->{ raise Exception }, ->{ raise SignalException }, ->{ 1 }]
array.each.retry(Exception, SignalException) { |i| i.call }
  # => 1

For the sake of reporting, previous exceptions are passed to the block.

[0, 1].each.retry do |i, ex|
  puts "LOG: Retrying due to exception: #{ex.to_s}" unless ex.nil?
  raise "bar"
end
  # => LOG: Retrying due to exception: bar
  # => RuntimeError: bar

Is it Complex?

Naw, it's 8 lines of ruby:

def retry(*exceptions, &block)
  exceptions << StandardError if exceptions.empty?
  enum       ||= self.to_enum
  yield enum.next
rescue *exceptions => e
  last_exception = e and retry unless e.is_a? StopIteration
  raise last_exception unless last_exception.nil?
end

Why?

Because I needed this code in more than one project, I didn't like the other solutions, and because coding is fun.

Isn't Monkey Patching Evil?

Yes. Do as I say, not as I do.

License

MIT YO. See MIT-LICENSE for more info.

Something went wrong with that request. Please try again.