feat: List resources from the watch cache

Signed-off-by: Antoni Zawodny <zawodny@google.com>

Author: tosi3k

pkg/cache/cluster.go

@@ -553,6 +553,7 @@ func (c *clusterCache) listResources(ctx context.Context, resClient dynamic.Reso
 		}
 
 		listRetry.Steps = int(c.listRetryLimit)
+		opts.ResourceVersion = "0"
 		err := retry.OnError(listRetry, c.listRetryFunc, func() error {
 			var ierr error
 			res, ierr = resClient.List(ctx, opts)
@@ -605,6 +606,7 @@ func (c *clusterCache) loadInitialState(ctx context.Context, api kube.APIResourc
 }
 
 func (c *clusterCache) watchEvents(ctx context.Context, api kube.APIResourceInfo, resClient dynamic.ResourceInterface, ns string, resourceVersion string) {
+	timeoutSeconds := int64(c.watchResyncTimeout.Seconds())
 	kube.RetryUntilSucceed(ctx, watchResourcesRetryTimeout, fmt.Sprintf("watch %s on %s", api.GroupKind, c.config.Host), c.log, func() (err error) {
 		defer func() {
 			if r := recover(); r != nil {
@@ -622,6 +624,7 @@ func (c *clusterCache) watchEvents(ctx context.Context, api kube.APIResourceInfo
 
 		w, err := watchutil.NewRetryWatcher(resourceVersion, &cache.ListWatch{
 			WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
+				options.TimeoutSeconds = &timeoutSeconds
 				res, err := resClient.Watch(ctx, options)
 				if errors.IsNotFound(err) {
 					c.stopWatching(api.GroupKind, ns)
@@ -633,30 +636,17 @@ func (c *clusterCache) watchEvents(ctx context.Context, api kube.APIResourceInfo
 			return err
 		}
 
-		defer func() {
-			w.Stop()
-			resourceVersion = ""
-		}()
-
-		var watchResyncTimeoutCh <-chan time.Time
-		if c.watchResyncTimeout > 0 {
-			shouldResync := time.NewTimer(c.watchResyncTimeout)
-			defer shouldResync.Stop()
-			watchResyncTimeoutCh = shouldResync.C
-		}
+		defer w.Stop()
 
 		for {
 			select {
 			// stop watching when parent context got cancelled
 			case <-ctx.Done():
 				return nil
 
-			// re-synchronize API state and restart watch periodically
-			case <-watchResyncTimeoutCh:
-				return fmt.Errorf("Resyncing %s on %s due to timeout", api.GroupKind, c.config.Host)
-
 			// re-synchronize API state and restart watch if retry watcher failed to continue watching using provided resource version
 			case <-w.Done():
+				resourceVersion = ""
 				return fmt.Errorf("Watch %s on %s has closed", api.GroupKind, c.config.Host)
 
 			case event, ok := <-w.ResultChan():
@@ -666,8 +656,10 @@ func (c *clusterCache) watchEvents(ctx context.Context, api kube.APIResourceInfo
 
 				obj, ok := event.Object.(*unstructured.Unstructured)
 				if !ok {
+					resourceVersion = ""
 					return fmt.Errorf("Failed to convert to *unstructured.Unstructured: %v", event.Object)
 				}
+				resourceVersion = obj.GetResourceVersion()
 
 				c.processEvent(event.Type, obj)
 				if kube.IsCRD(obj) {