Datacenter Fact

datacenter.rb

# A fact that uses CIDR network ranges to determine a node's datacenter.
#
# gist url: https://gist.github.com/natemccurdy/b434e0b24401f5bb1decf394fbe1d503
#
require 'ipaddr'
Facter.add(:datacenter) do
  setcode do
    # This hash defines the map of network segments to datacenters.
    # NOTE: To extend this fact, modify this hash with your segments and datacenters.
    datacenter_map = {
      'shire'   => IPAddr.new('10.10.10.0/22'),
      'rohan'   => IPAddr.new('11.11.11.0/22'),
      'lorien'  => IPAddr.new('12.12.12.0/22'),
      'mordor'  => [
        IPAddr.new('13.13.13.0/24'),
        IPAddr.new('15.15.15.0/24')
      ]
    }

    # Set the initial datacenter value to nil.
    # You could optionally change this to be 'none' or 'not_found' or something
    # that indicates we couldn't figure it out.
    datacenter = nil

    # Iterate through all subnets and find the one that
    # includes the default interface's IP address.
    datacenter_map.each do |datacenter_name, subnets|
      Array(subnets).each do |address|
        datacenter = datacenter_name if address.include?(Facter.value(:ipaddress))
      end
    end

    # Return the found datacenter.
    datacenter
  end
end

How would one check if any configured IP belongs to the subnet, not just the one in ipaddress fact?
I have issue with bridging interfaces, which are not 'main' from puppet's point of view