Creating extension point for kubernetesServiceLocator

Signed-off-by: Andres Mauricio Gomez P <andmagom@outlook.com>

plugins/kubernetes-node/src/extensions.ts

@@ -14,10 +14,13 @@
  * limitations under the License.
  */
 import { createExtensionPoint } from '@backstage/backend-plugin-api';
-import { KubernetesFetcher } from '@backstage/plugin-kubernetes-backend';
-import { AuthenticationStrategy } from '@backstage/plugin-kubernetes-node';
-import { KubernetesClustersSupplier } from '@backstage/plugin-kubernetes-node';
-import { KubernetesObjectsProvider } from '@backstage/plugin-kubernetes-node';
+import {
+  AuthenticationStrategy,
+  KubernetesClustersSupplier,
+  KubernetesFetcher,
+  KubernetesObjectsProvider,
+  KubernetesServiceLocator,
+} from '@backstage/plugin-kubernetes-node';
 
 /**
  * The interface for {@link kubernetesObjectsProviderExtensionPoint}.
@@ -94,3 +97,22 @@ export const kubernetesFetcherExtensionPoint =
   createExtensionPoint<KubernetesFetcherExtensionPoint>({
     id: 'kubernetes.fetcher',
   });
+
+/**
+ * The interface for {@link kubernetesServiceLocatorExtensionPoint}.
+ *
+ * @public
+ */
+export interface KubernetesServiceLocatorExtensionPoint {
+  addServiceLocator(serviceLocator: KubernetesServiceLocator): void;
+}
+
+/**
+ * An extension point the exposes the ability to configure a kubernetes service locator.
+ *
+ * @public
+ */
+export const kubernetesServiceLocatorExtensionPoint =
+  createExtensionPoint<KubernetesServiceLocatorExtensionPoint>({
+    id: 'kubernetes.service-locator',
+  });

plugins/kubernetes-node/src/types/types.ts

@@ -212,3 +212,21 @@ export interface KubernetesFetcher {
     labelSelector?: string,
   ): Promise<FetchResponseWrapper>;
 }
+/**
+ * @public
+ */
+export interface ServiceLocatorRequestContext {
+  objectTypesToFetch: Set<ObjectToFetch>;
+  customResources: CustomResourceMatcher[];
+}
+
+/**
+ * Used to locate which cluster(s) a service is running on
+ * @public
+ */
+export interface KubernetesServiceLocator {
+  getClustersByEntity(
+    entity: Entity,
+    requestContext: ServiceLocatorRequestContext,
+  ): Promise<{ clusters: ClusterDetails[] }>;
+}