added nameserver validator

app/jobs/nameserver_record_validation_job.rb

@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+require 'resolv'
+
+class NameserverRecordValidationJob < ApplicationJob
+  def perform(nameserver = nil)
+    if nameserver.nil?
+      Nameserver.all.map do |nameserver|
+        validate(nameserver)
+      end
+    else
+      rvalidate(nameserver)
+    end
+  end
+
+  private
+
+  def validate(nameserver)
+      return true if Resolv.getaddress nameserver.hostname
+
+      inform_to_registrar(nameserver)
+  rescue Resolv::ResolvError
+      inform_to_registrar(nameserver)
+      false
+  end
+
+  # def glue_record_required?(nameserver)
+  #   return false unless nameserver.hostname? && nameserver.domain
+  #
+  #   DomainName(nameserver.hostname).domain == nameserver.domain.name
+  # end
+
+  def inform_to_tech_contact
+    return
+  end
+
+  def inform_to_registrar(nameserver)
+    nameserver.domain.registrar.notifications.create!(text: "Nameserver doesn't response")
+  end
+end