Define Gitlab::Geo.primary_node_configured? abstraction

app/controllers/admin/application_controller.rb

@@ -12,7 +12,7 @@ class Admin::ApplicationController < ApplicationController
 
   def display_geo_information
     return unless Gitlab::Geo.secondary?
-    return unless Gitlab::Geo.primary_node.present?
+    return unless Gitlab::Geo.primary_node_configured?
 
     primary_node = view_context.link_to('primary node', Gitlab::Geo.primary_node.url)
     flash.now[:notice] = "You are on a secondary (read-only) Geo node. If you want to make any changes, you must visit the #{primary_node}.".html_safe

app/views/layouts/nav/_dashboard.html.haml

@@ -60,7 +60,7 @@
       = link_to sherlock_transactions_path, class: 'admin-icon', title: 'Sherlock Transactions',
         data: {toggle: 'tooltip', placement: 'bottom', container: 'body'} do
         = icon('tachometer fw')
-  - if Gitlab::Geo.secondary? && Gitlab::Geo.primary_node.present?
+  - if Gitlab::Geo.secondary? && Gitlab::Geo.primary_node_configured?
     %li
       = link_to Gitlab::Geo.primary_node.url, title: 'Go to primary node', data: {toggle: 'tooltip', placement: 'bottom', container: 'body'} do
         = icon('globe fw')

lib/gitlab/geo.rb

@@ -50,6 +50,10 @@ module Gitlab
       Rails.configuration.respond_to?(:geo_database)
     end
 
+    def self.primary_node_configured?
+      Gitlab::Geo.primary_node.present?
+    end
+
     def self.license_allows?
       ::License.feature_available?(:geo)
     end

spec/lib/gitlab/geo_spec.rb

@@ -43,6 +43,20 @@ describe Gitlab::Geo do
     end
   end
 
+  describe 'primary_node_configured?' do
+    context 'when current node is a primary node' do
+      it 'returns true' do
+        primary_node
+
+        expect(described_class.primary_node_configured?).to be_truthy
+      end
+
+      it 'returns false when primary does not exist' do
+        expect(described_class.primary_node_configured?).to be_falsey
+      end
+    end
+  end
+
   describe 'secondary?' do
     context 'when current node is a secondary node' do
       before do