Rails Integration

Project Setup

Firstly, we will create a new project for the purpose of this guide:

$ rails new websockets
--- snip ---

Then, we need to add the Falcon web server and the Async::WebSocket gem:

$ bundle add falcon async-websocket
$ bundle remove puma
--- snip ---
$ rails s
=> Booting Falcon
=> Rails 6.0.3.1 application starting in development http://localhost:3000
=> Run `rails server --help` for more startup options

Adding the WebSocket Controller

Firstly, generate the controller with a single method:

$ rails generate controller home index

Then edit your controller implementation:

require 'async/websocket/adapters/rack'

class HomeController < ApplicationController
	def index
		self.response = Async::WebSocket::Adapters::Rack.open(request.env) do |connection|
			connection.write({message: "Hello World"})
		end
	end
end

Testing

You can quickly test that the above controller is working using a websocket client: