Re-factor check for maintenance mode

ee/app/helpers/ee/application_helper.rb

@@ -13,7 +13,7 @@ module EE
     def read_only_message
       message = ::Gitlab::Geo.secondary? ? geo_secondary_read_only_message : super
 
-      return message unless maintenance_mode?
+      return message unless ::Gitlab.maintenance_mode?
       return maintenance_mode_message.concat(message) if message
 
       maintenance_mode_message
@@ -156,11 +156,5 @@ module EE
         next_unprocessed_event.created_at < EVENT_LAG_SHOW_THRESHOLD.ago
       end
     end
-
-    def maintenance_mode?
-      return unless ::Feature.enabled?(:maintenance_mode)
-
-      ::Gitlab::CurrentSettings.maintenance_mode
-    end
   end
 end

ee/lib/ee/gitlab/git_access.rb

@@ -96,15 +96,11 @@ module EE
 
       def check_maintenance_mode!(cmd)
         return unless cmd == 'git-receive-pack'
-        return unless maintenance_mode?
+        return unless ::Gitlab.maintenance_mode?
 
         raise ::Gitlab::GitAccess::ForbiddenError, 'Git push is not allowed because this GitLab instance is currently in (read-only) maintenance mode.'
       end
 
-      def maintenance_mode?
-        ::Gitlab::CurrentSettings.current_application_settings.maintenance_mode
-      end
-
       def can_access_without_new_smartcard_login?
         return true unless user
 

ee/lib/ee/gitlab/middleware/read_only/controller.rb

@@ -36,7 +36,7 @@ module EE
             allowed = super || geo_node_update_route? || geo_api_route?
 
             return true if allowed
-            return false if maintenance_mode?
+            return false if ::Gitlab.maintenance_mode?
             return false unless ::Gitlab::Geo.secondary?
 
             git_write_routes
@@ -90,13 +90,7 @@ module EE
 
           override :read_only?
           def read_only?
-            maintenance_mode? || super
-          end
-
-          def maintenance_mode?
-            return unless ::Feature.enabled?(:maintenance_mode)
-
-            ::Gitlab::CurrentSettings.maintenance_mode
+            ::Gitlab.maintenance_mode? || super
           end
         end
       end

lib/gitlab.rb

@@ -115,4 +115,10 @@ module Gitlab
 
     'web'
   end
+
+  def self.maintenance_mode?
+    return false unless ::Feature.enabled?(:maintenance_mode)
+
+    ::Gitlab::CurrentSettings.maintenance_mode
+  end
 end

spec/lib/gitlab_spec.rb

@@ -329,4 +329,24 @@ RSpec.describe Gitlab do
       expect(described_class.http_proxy_env?).to eq(false)
     end
   end
+
+  describe '.maintenance_mode?' do
+    it 'returns true when maintenance mode is enabled' do
+      stub_application_setting(maintenance_mode: true)
+
+      expect(described_class.maintenance_mode?).to eq(true)
+    end
+
+    it 'returns false when maintenance mode is disabled' do
+      stub_application_setting(maintenance_mode: false)
+
+      expect(described_class.maintenance_mode?).to eq(false)
+    end
+
+    it 'returns false when maintenance mode feature flag is disabled' do
+      stub_feature_flags(maintenance_mode: false)
+
+      expect(described_class.maintenance_mode?).to eq(false)
+    end
+  end
 end