ip_lookup_service.rb

# Here's my code with a few minor improvements
class IpLookupService

  def self.lookup_country(ip_address)
    result = self.lookup(ip_address)
    # expecting result is a object/instance returned by @g.lookup method
    raise GeoIpDB::Error unless result && result.found?
    (result.country && result.country.iso_code) ? result.country.iso_code.downcase : raise GeoIpDB::Error
  rescue GeoIpDB::Error
    "en"
  end

  private

  def self.init
    @g ||= GeoIpDB.new
  end

  def self.lookup(ip_address)
    self.init
    @g.lookup(ip_address)
  end
  
end