Bulk insert uploads

lib/gitlab/background_migration/populate_untracked_uploads.rb

@@ -56,7 +56,8 @@ module Gitlab
             uploader: uploader,
             model_type: model_type,
             model_id: model_id,
-            size: file_size
+            size: file_size,
+            checksum: checksum
           }
         end
@@ -90,10 +91,13 @@ module Gitlab
         end
         def file_size
-          absolute_path = File.join(CarrierWave.root, path)
           File.size(absolute_path)
         end
+        def checksum
+          Digest::SHA256.file(absolute_path).hexdigest
+        end
+
         # Not including a leading slash
         def path_relative_to_upload_dir
           base = %r{\A#{Regexp.escape(Gitlab::BackgroundMigration::PrepareUntrackedUploads::RELATIVE_UPLOAD_DIR)}/}
@@ -120,55 +124,14 @@ module Gitlab
           project = Project.find_by_full_path(full_path)
           project.id.to_s
         end
-      end
-
-      # Copy-pasted class for less fragile migration
-      class Upload < ActiveRecord::Base
-        self.table_name = 'uploads' # This is the only line different from copy-paste
-
-        # Upper limit for foreground checksum processing
-        CHECKSUM_THRESHOLD = 100.megabytes
-
-        belongs_to :model, polymorphic: true # rubocop:disable Cop/PolymorphicAssociations
-
-        before_save  :calculate_checksum, if:     :foreground_checksum?
-        after_commit :schedule_checksum,  unless: :foreground_checksum?
         def absolute_path
-          return path unless relative_path?
-
-          uploader_class.absolute_path(self)
-        end
-
-        def calculate_checksum
-          return unless exist?
-
-          self.checksum = Digest::SHA256.file(absolute_path).hexdigest
-        rescue StandardError
-          schedule_checksum
-        end
-
-        def exist?
-          File.exist?(absolute_path)
-        end
-
-        private
-
-        def foreground_checksum?
-          size <= CHECKSUM_THRESHOLD
-        end
-
-        def schedule_checksum
-          UploadChecksumWorker.perform_async(id)
-        end
-
-        def relative_path?
-          !path.start_with?('/')
+          File.join(CarrierWave.root, path)
         end
-        def uploader_class
-          Object.const_get(uploader)
-        end
+      end
+      class Upload < ActiveRecord::Base
+        self.table_name = 'uploads'
       end
       def perform(start_id, end_id)
@@ -207,9 +170,11 @@ module Gitlab
       end
       def insert(files)
-        files.each do |file|
-          Upload.create!(file.to_h)
+        rows = files.map do |file|
+          file.to_h.merge(created_at: 'NOW()')
         end
+
+        Gitlab::Database.bulk_insert('uploads', rows)
       end
       def drop_temp_table_if_finished