middlewares.ru

class MiddleWare1

  def initialize(app)
    @app = app
  end

  def call env
    puts self.class
    status, headers, body = @app.call(env)
    append_str = "\nGreetings from #{self.class}"
    body << append_str
    [status, headers, body]
  end
end


class MiddleWare2

  def initialize(app)
    @app = app
  end

  def call env
    puts self.class
    status, headers, body = @app.call(env)
    append_str = "\nGreetings from #{self.class}"
    body << append_str
    [status, headers, body]
  end
end

use Rack::Reloader
use MiddleWare1
use MiddleWare2


app =  Proc.new {|env|
  puts "#{Time.now}, env: #{env}"

  # status_code, headers, body
  [200, {}, ["Hello. The time is #{Time.now}"]]
}

run app

################################################################################
#                                 request
#                                    |
#                                    |
#
#                               MiddleWare1
#                                    |
#                                    |
#
#                               MiddleWare2
#                                    |
#                                    |
#
#                                   App
#
# onion architecture：https://github.com/dylanninin/dylanninin.github.com/issues/4
# - calling: request -> MiddleWare1 -> MiddleWare2 -> App
# - returning: App -> MiddleWare2 -> MiddleWare2 --> response
################################################################################

• run: rackup middlewares.ru
• test: curl -v http://127.0.0.1:9292