Refactor Storage Migration

Specs were reviewed and improved to better cover the current behavior.
There was some standardization done as well to facilitate the
implementation of the rollback functionality.

StorageMigratorWorker was extracted to HashedStorage namespace were
RollbackerWorker will live one as well.

1 files changed, 16 insertions, 0 deletions

diff --git a/app/workers/hashed_storage/migrator_worker.rb b/app/workers/hashed_storage/migrator_worker.rb
new file mode 100644
index 00000000000..49e347d4060
--- /dev/null
+++ b/app/workers/hashed_storage/migrator_worker.rb
@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+module HashedStorage
+  class MigratorWorker
+    include ApplicationWorker
+
+    queue_namespace :hashed_storage
+
+    # @param [Integer] start initial ID of the batch
+    # @param [Integer] finish last ID of the batch
+    def perform(start, finish)
+      migrator = Gitlab::HashedStorage::Migrator.new
+      migrator.bulk_migrate(start: start, finish: finish)
+    end
+  end
+end