Stairway

Easy step by step processing of your business logic.

Installation

Add this line to your application's Gemfile:

gem 'stairway'

Usage

First, create a new initializer to define the different steps of your Stairway:

# config/initializers/stairways.rb

import = Stairway::Stairs.new(:import)
import.steps = {
  download:    ImportSchedule::Download.new,
  unzip:       ImportSchedule::Unzip.new,
  convert_sql: ImportSchedule::ConvertToSQL.new,
  import:      ImportSchedule::Import.new
  clean:       ImportSchedule::Cleanup.new
}

Stairway.register(import)

Now, you can run the logic from anywhere in your application using:

Stairway.mount(:import).run

Define your steps

In the above section, you can see a ImportSchedule::Download class being intanciated. All your step should at least, respond to the run method. This method will be automatically called.

module ImportSchedule
  class Download < Stairway::Step
    def run
      # do stuff here…

      context[:file_path] = '/tmp/boom.zip'

      # `context` is available in all the steps
      # and can be modified.
    end
  emd
end

Break the flow

At any time, if you want to stop the processing for whatever reason, you can do this:

module ImportSchedule
  class Download < Stairway::Step
    def run
      begin
        # download your content…
      rescue DownloadError
        Stairway.stop
      end
    end
  end
end

Run a single step

Sometime, I guess, you'll want to run a single step.