GraphQL: Add groups property to Runner type

Changelog: added

app/graphql/types/ci/runner_type.rb

@@ -63,6 +63,8 @@ module Types
             description: 'Executor last advertised by the runner.',
             method: :executor_name,
             feature_flag: :graphql_ci_runner_executor
+      field :groups, ::Types::GroupType.connection_type, null: true,
+            description: 'Groups the runner is associated with. For group runners only.'
 
       def job_count
         # We limit to 1 above the JOB_COUNT_LIMIT to indicate that more items exist after JOB_COUNT_LIMIT
@@ -92,6 +94,24 @@ module Types
           end
         end
       end
+
+      def groups
+        BatchLoader::GraphQL.for(runner.id).batch(key: :runner_groups) do |runner_ids, loader, args|
+          runner_and_namespace_ids =
+            ::Ci::RunnerNamespace
+              .where(runner_id: runner_ids)
+              .pluck(:runner_id, :namespace_id)
+
+          group_ids_by_runner_id = runner_and_namespace_ids.group_by(&:first).transform_values { |v| v.pluck(1) }
+          group_ids = runner_and_namespace_ids.pluck(1).uniq
+
+          groups = Group.where(id: group_ids).index_by(&:id)
+
+          runner_ids.each do |runner_id|
+            loader.call(runner_id, group_ids_by_runner_id[runner_id]&.map { |group_id| groups[group_id] })
+          end
+        end
+      end
       # rubocop: enable CodeReuse/ActiveRecord
 
       private

doc/api/graphql/reference/index.md

@@ -9022,6 +9022,7 @@ Represents the total number of issues and their weights for a particular day.
 | <a id="cirunnerdescription"></a>`description` | [`String`](#string) | Description of the runner. |
 | <a id="cirunnereditadminurl"></a>`editAdminUrl` | [`String`](#string) | Admin form URL of the runner. Only available for administrators. |
 | <a id="cirunnerexecutorname"></a>`executorName` | [`String`](#string) | Executor last advertised by the runner. Available only when feature flag `graphql_ci_runner_executor` is enabled. This flag is disabled by default, because the feature is experimental and is subject to change without notice. |
+| <a id="cirunnergroups"></a>`groups` | [`GroupConnection`](#groupconnection) | Groups the runner is associated with. For group runners only. (see [Connections](#connections)) |
 | <a id="cirunnerid"></a>`id` | [`CiRunnerID!`](#cirunnerid) | ID of the runner. |
 | <a id="cirunneripaddress"></a>`ipAddress` | [`String`](#string) | IP address of the runner. |
 | <a id="cirunnerjobcount"></a>`jobCount` | [`Int`](#int) | Number of jobs processed by the runner (limited to 1000, plus one to indicate that more items exist). |

spec/graphql/types/ci/runner_type_spec.rb

@@ -12,6 +12,7 @@ RSpec.describe GitlabSchema.types['CiRunner'] do
       id description created_at contacted_at maximum_timeout access_level active status
       version short_sha revision locked run_untagged ip_address runner_type tag_list
       project_count job_count admin_url edit_admin_url user_permissions executor_name
+      groups
     ]
 
     expect(described_class).to include_graphql_fields(*expected_fields)

spec/requests/api/graphql/ci/runner_spec.rb

@@ -223,6 +223,29 @@ RSpec.describe 'Query.runner(id)' do
     end
   end
 
+  describe 'for group runner request' do
+    let(:query) do
+      %(
+        query {
+          runner(id: "gid://gitlab/Ci::Runner/#{active_group_runner.id}") {
+            groups {
+              nodes {
+                id
+              }
+            }
+          }
+        }
+      )
+    end
+
+    it 'retrieves groups field with expected value' do
+      post_graphql(query, current_user: user)
+
+      runner_data = graphql_data_at(:runner, :groups)
+      expect(runner_data).to eq 'nodes' => [{ 'id' => group.to_global_id.to_s }]
+    end
+  end
+
   describe 'for runner with status' do
     let_it_be(:stale_runner) { create(:ci_runner, description: 'Stale runner 1', created_at: 3.months.ago) }
     let_it_be(:never_contacted_instance_runner) { create(:ci_runner, description: 'Missing runner 1', created_at: 1.month.ago, contacted_at: nil) }
@@ -326,9 +349,15 @@ RSpec.describe 'Query.runner(id)' do
   describe 'by regular user' do
     let(:user) { create(:user) }
 
+    context 'on instance runner' do
       it_behaves_like 'retrieval by unauthorized user', :active_instance_runner
     end
 
+    context 'on group runner' do
+      it_behaves_like 'retrieval by unauthorized user', :active_group_runner
+    end
+  end
+
   describe 'by non-admin user' do
     let(:user) { create(:user) }