Added Rollbacker workers and support on the rake task

Rollback is done similar to Migration for the Hashed Storage.
It also shares the same ExclusiveLease key to prevent both happening
at the same time.

All Hashed Storage related workers now share the same queue namespace
which allows for assigning dedicated workers easily.

1 files changed, 27 insertions, 0 deletions

diff --git a/spec/workers/hashed_storage/rollbacker_worker_spec.rb b/spec/workers/hashed_storage/rollbacker_worker_spec.rb
new file mode 100644
index 00000000000..4055f380978
--- /dev/null
+++ b/spec/workers/hashed_storage/rollbacker_worker_spec.rb
@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe HashedStorage::RollbackerWorker do
+  subject(:worker) { described_class.new }
+  let(:projects) { create_list(:project, 2, :empty_repo) }
+  let(:ids) { projects.map(&:id) }
+
+  describe '#perform' do
+    it 'delegates to MigratorService' do
+      expect_any_instance_of(Gitlab::HashedStorage::Migrator).to receive(:bulk_rollback).with(start: 5, finish: 10)
+
+      worker.perform(5, 10)
+    end
+
+    it 'rollsback projects in the specified range' do
+      perform_enqueued_jobs do
+        worker.perform(ids.min, ids.max)
+      end
+
+      projects.each do |project|
+        expect(project.reload.legacy_storage?).to be_truthy
+      end
+    end
+  end
+end