Migrate jobs in object_storage_upload queue

changelogs/unreleased/jprovazn-uploader-migration.yml

+---
+title: Migrate any remaining jobs from deprecated `object_storage_upload` queue.
+merge_request:
+author:
+type: deprecated

db/post_migrate/20180603190921_migrate_object_storage_upload_sidekiq_queue.rb

+class MigrateObjectStorageUploadSidekiqQueue < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    sidekiq_queue_migrate 'object_storage_upload', to: 'object_storage:object_storage_background_move'
+  end
+
+  def down
+    # do not migrate any jobs back because we would migrate also
+    # jobs which were not part of the 'object_storage_upload'
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20180531220618) do
+ActiveRecord::Schema.define(version: 20180603190921) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"

spec/migrations/migrate_object_storage_upload_sidekiq_queue_spec.rb

+require 'spec_helper'
+require Rails.root.join('db', 'post_migrate', '20180603190921_migrate_object_storage_upload_sidekiq_queue.rb')
+
+describe MigrateObjectStorageUploadSidekiqQueue, :sidekiq, :redis do
+  include Gitlab::Database::MigrationHelpers
+
+  context 'when there are jobs in the queue' do
+    it 'correctly migrates queue when migrating up' do
+      Sidekiq::Testing.disable! do
+        stubbed_worker(queue: 'object_storage_upload').perform_async('Something', [1])
+        stubbed_worker(queue: 'object_storage:object_storage_background_move').perform_async('Something', [1])
+
+        described_class.new.up
+
+        expect(sidekiq_queue_length('object_storage_upload')).to eq 0
+        expect(sidekiq_queue_length('object_storage:object_storage_background_move')).to eq 2
+      end
+    end
+  end
+
+  context 'when there are no jobs in the queues' do
+    it 'does not raise error when migrating up' do
+      expect { described_class.new.up }.not_to raise_error
+    end
+  end
+
+  def stubbed_worker(queue:)
+    Class.new do
+      include Sidekiq::Worker
+      sidekiq_options queue: queue
+    end
+  end
+end