Extract single place to set up indexers (#3454)

controllers/actions.github.com/indexer.go

@@ -0,0 +1,71 @@
+package actionsgithubcom
+
+import (
+	"context"
+	"slices"
+
+	v1alpha1 "github.com/actions/actions-runner-controller/apis/actions.github.com/v1alpha1"
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	ctrl "sigs.k8s.io/controller-runtime"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+)
+
+func SetupIndexers(mgr ctrl.Manager) error {
+	if err := mgr.GetFieldIndexer().IndexField(
+		context.Background(),
+		&corev1.Pod{},
+		resourceOwnerKey,
+		newGroupVersionOwnerKindIndexer("AutoscalingListener", "EphemeralRunner"),
+	); err != nil {
+		return err
+	}
+
+	if err := mgr.GetFieldIndexer().IndexField(
+		context.Background(),
+		&corev1.ServiceAccount{},
+		resourceOwnerKey,
+		newGroupVersionOwnerKindIndexer("AutoscalingListener"),
+	); err != nil {
+		return err
+	}
+
+	if err := mgr.GetFieldIndexer().IndexField(
+		context.Background(),
+		&v1alpha1.EphemeralRunnerSet{},
+		resourceOwnerKey,
+		newGroupVersionOwnerKindIndexer("AutoscalingRunnerSet"),
+	); err != nil {
+		return err
+	}
+
+	if err := mgr.GetFieldIndexer().IndexField(
+		context.Background(),
+		&v1alpha1.EphemeralRunner{},
+		resourceOwnerKey,
+		newGroupVersionOwnerKindIndexer("EphemeralRunnerSet"),
+	); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func newGroupVersionOwnerKindIndexer(ownerKind string, otherOwnerKinds ...string) client.IndexerFunc {
+	owners := append([]string{ownerKind}, otherOwnerKinds...)
+	return func(o client.Object) []string {
+		groupVersion := v1alpha1.GroupVersion.String()
+		owner := metav1.GetControllerOfNoCopy(o)
+		if owner == nil {
+			return nil
+		}
+
+		// ...make sure it is owned by this controller
+		if owner.APIVersion != groupVersion || !slices.Contains(owners, owner.Kind) {
+			return nil
+		}
+
+		// ...and if so, return it
+		return []string{owner.Name}
+	}
+}