request_router.rb

module RequestRouter
  ADMIN_REQUESTS = %w[
    names
    of_admin_methods
    go_here
    this_is_an_admin_method
  ]

  
  def request(params)
    if ADMIN_REQUESTS.include? calling_method
      # create the admin service connection if necessary
      @admin_service ||= admin_connection(:keystone, @options[:openstack_region].to_sym)
      base_request(@admin_service, params)
    else
      base_request(@service, params)
    end
    
  end

  private

  # Here there be dragons...
  def calling_method
    caller(2, 1).first.split("`")[1].sub(/'/, "")
  end
end





class PretendThisIsAService
  include RequestRouter

  def this_is_an_admin_method
    request({})
  end

  def this_is_not_an_admin_method
    request({})
  end

  # Methods below are stubs to support this example

  def initialize
    @options = { :openstack_region => :ord }
    @service = :boring_normal_method
  end

  def admin_connection(*args)
    :admin
  end

  def base_request(service_type, _)
    service_type
  end
end


## DEMONSTRATION

s = PretendThisIsAService.new

r1 = s.this_is_an_admin_method
r2 = s.this_is_not_an_admin_method

puts "admin method: #{r1}"       # outputs "admin" because its the result of an admin method
puts "not admin method: #{r2}"   # outputs "boring_normal_method" because not an admin method