feat: added labelSelector to cache and informer

Author: StefanCenusa

src/cache.ts

@@ -1,9 +1,11 @@
+import { ObjectSerializer } from './api';
 import { ADD, CHANGE, DELETE, ERROR, Informer, ListPromise, ObjectCallback, UPDATE } from './informer';
 import { KubernetesObject } from './types';
 import { RequestResult, Watch } from './watch';
 
 export interface ObjectCache<T> {
     get(name: string, namespace?: string): T | undefined;
+
     list(namespace?: string): ReadonlyArray<T>;
 }
 
@@ -20,6 +22,7 @@ export class ListWatch<T extends KubernetesObject> implements ObjectCache<T>, In
         private readonly watch: Watch,
         private readonly listFn: ListPromise<T>,
         autoStart: boolean = true,
+        private readonly labelSelector?: string,
     ) {
         this.callbackCache[ADD] = [];
         this.callbackCache[UPDATE] = [];
@@ -125,9 +128,18 @@ export class ListWatch<T extends KubernetesObject> implements ObjectCache<T>, In
             }
         });
         this.addOrUpdateItems(list.items);
+        const queryParams = {
+            resourceVersion: list.metadata!.resourceVersion,
+        } as {
+            resourceVersion: string | undefined,
+            labelSelector: string | undefined,
+        };
+        if (this.labelSelector !== undefined) {
+            queryParams.labelSelector = ObjectSerializer.serialize(this.labelSelector, 'string');
+        }
         this.request = await this.watch.watch(
             this.path,
-            { resourceVersion: list.metadata!.resourceVersion },
+            queryParams,
             this.watchHandler.bind(this),
             this.doneHandler.bind(this),
         );

src/informer.ts

@@ -29,7 +29,8 @@ export function makeInformer<T>(
     kubeconfig: KubeConfig,
     path: string,
     listPromiseFn: ListPromise<T>,
+    labelSelector?: string,
 ): Informer<T> {
     const watch = new Watch(kubeconfig);
-    return new ListWatch<T>(path, watch, listPromiseFn, false);
+    return new ListWatch<T>(path, watch, listPromiseFn, false, labelSelector);
 }