test.ru

module RestSource
  attr_accessor :env

  def call(env)
    @env = env
    method = env['REQUEST_METHOD'].downcase.to_sym
    params = env['REQUEST_URI'][1..-1].split('/').collect { |p|
      Rack::Utils.unescape(p)
    }

    puts "Calling #{method} with: #{params.map {|p| p.inspect }.join(', ')}"

    begin
      status, body = 200, send(method, *params)
    rescue NoMethodError
      status, body = 500, "Internal error: no action #{method} defined"
    rescue ArgumentError
      status, body = 500, "Internal error: too much parameters"
    end

    [status, {"Content-Type" => 'text/html'}, body]
  end

end

class App
  extend RestSource

  def self.get(name="world")
    "Hello #{name}!\n"
  end

end

run App