reactor.gem

A Sidekiq-backed pub/sub layer for your Rails app.

Warning: this is under active development!

This gem aims to provide the following tools to augment your ActiveRecord & Sidekiq stack.

1. Barebones event API through Sidekiq to publish whatever you want
2. Database-driven API to manage subscribers so that users may rewire whatever you let them (transactional emails, campaigns, etc...)
3. Static/Code-driven API to subscribe a basic ruby block to an event.
4. A new communication pattern between your ActiveRecord models that runs asynchronously through Sidekiq. a. describe model lifecycle events and callbacks with class-level helper methods/DSL

Installation

Add this line to your application's Gemfile:

gem 'reactor'

And then execute:

$ bundle

Or install it yourself as:

$ gem install reactor

Usage

Well, this is evolving, so it's probably best to go read the specs.

Barebones API

Reactor::Event.publish(:event_name, any: 'data', you: 'want')

ActiveModel extensions

Publishable

Describe lifecycle events like so

publishes :my_model_created
publishes :state_has_changed, if: -> { state_has_changed? }

Subscribable

You can now bind any block to an event in your models like so

on_event :any_event do |event|
  event.target.do_something_about_it!
end

Static subscribers like these are automatically placed into Sidekiq and executed in the background

It's also possible to run a subscriber block in memory like so

on_event :any_event, in_memory: true do |event|
  event.target.do_something_about_it_and_make_the_user_wait!
end

Testing

Calling Reactor.test_mode! enables test mode. (You should call this as early as possible, before your subscriber classes are declared). In test mode, no subscribers will fire unless they are specifically enabled, which can be accomplished by calling

Reactor.enable_test_mode_subscriber(MyAwesomeSubscriberClass)

We also provide

Reactor.with_subscriber_enabled(MyClass) do
  # stuff
end

for your testing convenience.

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request

Open Source by Hired

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We are Ruby developers ourselves, and we use all of our open source projects in production. We always encourge forks, pull requests, and issues. Get in touch with the Hired Engineering team at opensource@hired.com.