refactor wiki service

app/services/geo/wiki_sync_service.rb

@@ -32,12 +32,12 @@ module Geo
            Gitlab::Shell::Error,
            ProjectWiki::CouldNotCreateWikiError,
            Geo::EmptyCloneUrlPrefixError => e
-      log_error('Error syncing wiki repository', e)
-      registry.increment!(:wiki_retry_count)
+      fail_registry('Error syncing wiki repository', e)
     rescue Gitlab::Git::Repository::NoRepository => e
-      log_error('Invalid wiki', e)
-      registry.update(force_to_redownload_wiki: true,
-                      wiki_retry_count: retry_count + 1)
+      fail_registry('Invalid wiki', e)
+
+      log_info('Setting force_to_redownload flag')
+      registry.update(force_to_redownload_wiki: true,)
     ensure
       clean_up_temporary_repository if redownload
     end
@@ -50,6 +50,13 @@ module Geo
       project.wiki.repository
     end
 
+    def fail_registry(message, error)
+      log_error(message, error)
+
+      registry.update!(last_wiki_sync_failure: "#{message}: #{error.message}",
+                       wiki_retry_count: retry_count + 1)
+    end
+
     def retry_count
       registry.public_send("#{type}_retry_count") || -1 # rubocop:disable GitlabSecurity/PublicSend
     end