Websockets using Rails 5 beta 2, ActionCable and Puma on Heroku

action_cable_heroku.rb

# Should be in /app/middleware/
require 'websocket/driver'

class ActionCableHeroku
  def initialize(app, options={})
    @app = app
  end

  def call(env)
    if WebSocket::Driver.websocket?(env)
      ActionCable.server.call(env)
    else
      @app.call(env)
    end
  end
end

cable.yml

# Action Cable uses Redis by default to administer connections, channels, and sending/receiving messages over the WebSocket.
production:
  adapter: redis
  url: <%= ENV['REDIS_URL'] %>


local: &local
  adapter: redis
  url: redis://localhost:6379


development: *local
test: *local

production.rb

// config/environments/production.rb

Rails.application.configure do
  config.middleware.use ActionCableHeroku
  config.action_cable.log_tags = [
      -> request { request.env['bc.account_id'] || "no-account" },
      :action_cable,
      -> request { request.uuid }
  ]
  config.action_cable.allowed_request_origins = %w(
    http://www.terminal49.com
    http://localhost:3000
  )
  
  # ...
  
end