class Geocoder::Lookup::MaxmindGeoip2

def configured_service!
  if s = configuration[:service] and services.include?(s) and configuration[:basic_auth][:user] and configuration[:basic_auth][:password]
    return s
  else
    raise(
      Geocoder::ConfigurationError,
      "When using MaxMind GeoIP2 you MUST specify a service name and basic_auth: " +
      "Geocoder.configure(:maxmind_geoip2 => {:service => ...}, " +
      ":basic_auth => {:user ..., :password => ...}), " +
      "where service is one of: #{services.inspect}"
    )
  end
end