1 files changed, 50 insertions, 0 deletions
diff --git a/lib/gitlab/github_import/sequential_importer.rb b/lib/gitlab/github_import/sequential_importer.rb
new file mode 100644
index 00000000000..4f7324536a0
--- /dev/null
+++ b/lib/gitlab/github_import/sequential_importer.rb
@@ -0,0 +1,50 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module GithubImport
+    # The SequentialImporter imports a GitHub project in a single thread,
+    # without using Sidekiq. This makes it useful for testing purposes as well
+    # as Rake tasks, but it should be avoided for anything else in favour of the
+    # parallel importer.
+    class SequentialImporter
+      attr_reader :project, :client
+
+      SEQUENTIAL_IMPORTERS = [
+        Importer::LabelsImporter,
+        Importer::MilestonesImporter,
+        Importer::ReleasesImporter
+      ].freeze
+
+      PARALLEL_IMPORTERS = [
+        Importer::PullRequestsImporter,
+        Importer::IssuesImporter,
+        Importer::DiffNotesImporter,
+        Importer::NotesImporter
+      ].freeze
+
+      # project - The project to import the data into.
+      # token - The token to use for the GitHub API.
+      def initialize(project, token: nil)
+        @project = project
+        @client = GithubImport
+          .new_client_for(project, token: token, parallel: false)
+      end
+
+      def execute
+        Importer::RepositoryImporter.new(project, client).execute
+
+        SEQUENTIAL_IMPORTERS.each do |klass|
+          klass.new(project, client).execute
+        end
+
+        PARALLEL_IMPORTERS.each do |klass|
+          klass.new(project, client, parallel: false).execute
+        end
+
+        project.repository.after_import
+
+        true
+      end
+    end
+  end
+end