Adds Rollback functionality to HashedStorage migration

We are adding sidekiq workers and service classes to allow to rollback
a hashed storage migration. There are some refactoring involved as well
as part of the code can be reused by both the migration and the rollback
logic.

1 files changed, 8 insertions, 1 deletions

diff --git a/lib/gitlab/hashed_storage/migrator.rb b/lib/gitlab/hashed_storage/migrator.rb
index bf463077dcc..73ed57ea584 100644
--- a/lib/gitlab/hashed_storage/migrator.rb
+++ b/lib/gitlab/hashed_storage/migrator.rb
@@ -45,8 +45,15 @@ module Gitlab
         Rails.logger.error("#{err.message} migrating storage of #{project.full_path} (ID=#{project.id}), trace - #{err.backtrace}")
       end
 
+      # Flag a project to be rolled-back to Legacy Storage
+      #
+      # @param [Project] project that will be rolled-back
       def rollback(project)
-        # TODO: implement rollback strategy
+        Rails.logger.info "Starting storage rollback of #{project.full_path} (ID=#{project.id})..."
+
+        project.rollback_to_legacy_storage!
+      rescue => err
+        Rails.logger.error("#{err.message} rolling-back storage of #{project.full_path} (ID=#{project.id}), trace - #{err.backtrace}")
       end
 
       private