Expose github stats in realtime_changes private API

* Add ability to view realtime stats for github

Changelog: added

app/controllers/import/github_controller.rb

@@ -62,7 +62,15 @@ class Import::GithubController < Import::BaseController
   end
 
   def realtime_changes
-    super
+    Gitlab::PollingInterval.set_header(response, interval: 3_000)
+
+    render json: already_added_projects.map { |project|
+      {
+        id: project.id,
+        import_status: project.import_status,
+        stats: ::Gitlab::GithubImport::ObjectCounter.summary(project)
+      }
+    }
   end
 
   protected

spec/controllers/import/github_controller_spec.rb

@@ -293,6 +293,22 @@ RSpec.describe Import::GithubController do
   end
 
   describe "GET realtime_changes" do
+    let(:user) { create(:user) }
+
     it_behaves_like 'a GitHub-ish import controller: GET realtime_changes'
+
+    before do
+      assign_session_token(provider)
+    end
+
+    it 'includes stats in response' do
+      create(:project, import_type: provider, namespace: user.namespace, import_status: :finished, import_source: 'example/repo')
+
+      get :realtime_changes
+
+      expect(json_response[0]).to include('stats')
+      expect(json_response[0]['stats']).to include('fetched')
+      expect(json_response[0]['stats']).to include('imported')
+    end
   end
 end

spec/support/shared_examples/controllers/githubish_import_controller_shared_examples.rb

@@ -515,7 +515,7 @@ RSpec.shared_examples 'a GitHub-ish import controller: GET realtime_changes' do
 
     get :realtime_changes
 
-    expect(json_response).to eq([{ "id" => project.id, "import_status" => project.import_status }])
+    expect(json_response).to match([a_hash_including({ "id" => project.id, "import_status" => project.import_status })])
     expect(Integer(response.headers['Poll-Interval'])).to be > -1
   end
 end