few updates in datastore

pkg/epp/controller/inferencemodel_reconciler_test.go

@@ -25,6 +25,7 @@ import (
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/types"
+	clientgoscheme "k8s.io/client-go/kubernetes/scheme"
 	"k8s.io/client-go/tools/record"
 	ctrl "sigs.k8s.io/controller-runtime"
 	"sigs.k8s.io/controller-runtime/pkg/client"
@@ -178,6 +179,7 @@ func TestInferenceModelReconciler(t *testing.T) {
 		t.Run(test.name, func(t *testing.T) {
 			// Create a fake client with no InferenceModel objects.
 			scheme := runtime.NewScheme()
+			_ = clientgoscheme.AddToScheme(scheme)
 			_ = v1alpha2.Install(scheme)
 			initObjs := []client.Object{}
 			if test.model != nil {
@@ -186,6 +188,7 @@ func TestInferenceModelReconciler(t *testing.T) {
 			for _, m := range test.modelsInAPIServer {
 				initObjs = append(initObjs, m)
 			}
+
 			fakeClient := fake.NewClientBuilder().
 				WithScheme(scheme).
 				WithObjects(initObjs...).
@@ -196,7 +199,7 @@ func TestInferenceModelReconciler(t *testing.T) {
 			for _, m := range test.modelsInStore {
 				ds.ModelSetIfOlder(m)
 			}
-			ds.PoolSet(pool)
+			ds.PoolSet(context.Background(), fakeClient, pool)
 			reconciler := &InferenceModelReconciler{
 				Client:             fakeClient,
 				Record:             record.NewFakeRecorder(10),

pkg/epp/controller/inferencepool_reconciler.go

@@ -18,7 +18,6 @@ package controller
 
 import (
 	"context"
-	"reflect"
 
 	"k8s.io/apimachinery/pkg/api/errors"
 	"k8s.io/client-go/tools/record"
@@ -60,28 +59,15 @@ func (c *InferencePoolReconciler) Reconcile(ctx context.Context, req ctrl.Reques
 		c.Datastore.Clear()
 		return ctrl.Result{}, nil
 	}
-
-	c.updateDatastore(ctx, infPool)
+	// update pool in datastore
+	if err := c.Datastore.PoolSet(ctx, c.Client, infPool); err != nil {
+		logger.Error(err, "Failed to update datastore")
+		return ctrl.Result{}, err
+	}
 
 	return ctrl.Result{}, nil
 }
 
-func (c *InferencePoolReconciler) updateDatastore(ctx context.Context, newPool *v1alpha2.InferencePool) {
-	logger := log.FromContext(ctx)
-	oldPool, err := c.Datastore.PoolGet()
-	c.Datastore.PoolSet(newPool)
-	if err != nil || !reflect.DeepEqual(newPool.Spec.Selector, oldPool.Spec.Selector) {
-		logger.V(logutil.DEFAULT).Info("Updating inference pool endpoints", "selector", newPool.Spec.Selector)
-		// A full resync is required to address two cases:
-		// 1) At startup, the pod events may get processed before the pool is synced with the datastore,
-		//    and hence they will not be added to the store since pool selector is not known yet
-		// 2) If the selector on the pool was updated, then we will not get any pod events, and so we need
-		//    to resync the whole pool: remove pods in the store that don't match the new selector and add
-		//    the ones that may have existed already to the store.
-		c.Datastore.PodResyncAll(ctx, c.Client, newPool)
-	}
-}
-
 func (c *InferencePoolReconciler) SetupWithManager(mgr ctrl.Manager) error {
 	return ctrl.NewControllerManagedBy(mgr).
 		For(&v1alpha2.InferencePool{}).

pkg/epp/controller/pod_reconciler.go

@@ -72,7 +72,7 @@ func (c *PodReconciler) SetupWithManager(mgr ctrl.Manager) error {
 
 func (c *PodReconciler) updateDatastore(logger logr.Logger, pod *corev1.Pod, pool *v1alpha2.InferencePool) {
 	namespacedName := types.NamespacedName{Name: pod.Name, Namespace: pod.Namespace}
-	if !pod.DeletionTimestamp.IsZero() || !c.Datastore.PoolLabelsMatch(pod.Labels) || !podutil.IsPodReady(pod) {
+	if !podutil.IsPodReady(pod) || !c.Datastore.PoolLabelsMatch(pod.Labels) {
 		logger.V(logutil.DEBUG).Info("Pod removed or not added", "name", namespacedName)
 		c.Datastore.PodDelete(namespacedName)
 	} else {

pkg/epp/controller/pod_reconciler_test.go

@@ -182,7 +182,7 @@ func TestPodReconciler(t *testing.T) {
 
 			// Configure the initial state of the datastore.
 			store := datastore.NewDatastore(t.Context(), pmf)
-			store.PoolSet(test.pool)
+			store.PoolSet(t.Context(), fakeClient, test.pool)
 			for _, pod := range test.existingPods {
 				store.PodUpdateOrAddIfNotExist(pod, pool)
 			}

pkg/epp/datastore/datastore.go

@@ -20,6 +20,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"reflect"
 	"sync"
 
 	corev1 "k8s.io/api/core/v1"
@@ -44,7 +45,10 @@ var (
 // The datastore is a local cache of relevant data for the given InferencePool (currently all pulled from k8s-api)
 type Datastore interface {
 	// InferencePool operations
-	PoolSet(pool *v1alpha2.InferencePool)
+	// PoolSet sets the given pool in datastore. If the given pool has different label selector than the previous pool
+	// that was stored, the function triggers a resync of the pods to keep the datastore updated. If the given pool
+	// is nil, this call triggers the datastore.Clear() function.
+	PoolSet(ctx context.Context, client client.Client, pool *v1alpha2.InferencePool) error
 	PoolGet() (*v1alpha2.InferencePool, error)
 	PoolHasSynced() bool
 	PoolLabelsMatch(podLabels map[string]string) bool
@@ -63,7 +67,6 @@ type Datastore interface {
 	PodList(func(backendmetrics.PodMetrics) bool) []backendmetrics.PodMetrics
 	PodUpdateOrAddIfNotExist(pod *corev1.Pod, pool *v1alpha2.InferencePool) bool
 	PodDelete(namespacedName types.NamespacedName)
-	PodResyncAll(ctx context.Context, ctrlClient client.Client, pool *v1alpha2.InferencePool)
 
 	// Clears the store state, happens when the pool gets deleted.
 	Clear()
@@ -102,10 +105,31 @@ func (ds *datastore) Clear() {
 }
 
 // /// InferencePool APIs ///
-func (ds *datastore) PoolSet(pool *v1alpha2.InferencePool) {
+func (ds *datastore) PoolSet(ctx context.Context, client client.Client, pool *v1alpha2.InferencePool) error {
+	if pool == nil {
+		ds.Clear()
+		return nil
+	}
+	logger := log.FromContext(ctx)
 	ds.poolAndModelsMu.Lock()
 	defer ds.poolAndModelsMu.Unlock()
+
+	oldPool := ds.pool
 	ds.pool = pool
+	if oldPool == nil || !reflect.DeepEqual(pool.Spec.Selector, oldPool.Spec.Selector) {
+		logger.V(logutil.DEFAULT).Info("Updating inference pool endpoints", "selector", pool.Spec.Selector)
+		// A full resync is required to address two cases:
+		// 1) At startup, the pod events may get processed before the pool is synced with the datastore,
+		//    and hence they will not be added to the store since pool selector is not known yet
+		// 2) If the selector on the pool was updated, then we will not get any pod events, and so we need
+		//    to resync the whole pool: remove pods in the store that don't match the new selector and add
+		//    the ones that may have existed already to the store.
+		if err := ds.podResyncAll(ctx, client); err != nil {
+			return fmt.Errorf("failed to update pods according to the pool selector")
+		}
+	}
+
+	return nil
 }
 
 func (ds *datastore) PoolGet() (*v1alpha2.InferencePool, error) {
@@ -247,27 +271,35 @@ func (ds *datastore) PodUpdateOrAddIfNotExist(pod *corev1.Pod, pool *v1alpha2.In
 	return ok
 }
 
-func (ds *datastore) PodResyncAll(ctx context.Context, ctrlClient client.Client, pool *v1alpha2.InferencePool) {
+func (ds *datastore) PodDelete(namespacedName types.NamespacedName) {
+	v, ok := ds.pods.LoadAndDelete(namespacedName)
+	if ok {
+		pmr := v.(backendmetrics.PodMetrics)
+		pmr.StopRefreshLoop()
+	}
+}
+
+func (ds *datastore) podResyncAll(ctx context.Context, ctrlClient client.Client) error {
 	logger := log.FromContext(ctx)
 	podList := &corev1.PodList{}
 	if err := ctrlClient.List(ctx, podList, &client.ListOptions{
-		LabelSelector: selectorFromInferencePoolSelector(pool.Spec.Selector),
-		Namespace:     pool.Namespace,
+		LabelSelector: selectorFromInferencePoolSelector(ds.pool.Spec.Selector),
+		Namespace:     ds.pool.Namespace,
 	}); err != nil {
-		log.FromContext(ctx).V(logutil.DEFAULT).Error(err, "Failed to list clients")
-		return
+		return fmt.Errorf("failed to list pods - %w", err)
 	}
 
 	activePods := make(map[string]bool)
 	for _, pod := range podList.Items {
-		if podutil.IsPodReady(&pod) {
-			namespacedName := types.NamespacedName{Name: pod.Name, Namespace: pod.Namespace}
-			activePods[pod.Name] = true
-			if ds.PodUpdateOrAddIfNotExist(&pod, pool) {
-				logger.V(logutil.DEFAULT).Info("Pod added", "name", namespacedName)
-			} else {
-				logger.V(logutil.DEFAULT).Info("Pod already exists", "name", namespacedName)
-			}
+		if !podutil.IsPodReady(&pod) {
+			continue
+		}
+		namespacedName := types.NamespacedName{Name: pod.Name, Namespace: pod.Namespace}
+		activePods[pod.Name] = true
+		if ds.PodUpdateOrAddIfNotExist(&pod, ds.pool) {
+			logger.V(logutil.DEFAULT).Info("Pod added", "name", namespacedName)
+		} else {
+			logger.V(logutil.DEFAULT).Info("Pod already exists", "name", namespacedName)
 		}
 	}
 
@@ -281,14 +313,8 @@ func (ds *datastore) PodResyncAll(ctx context.Context, ctrlClient client.Client,
 		return true
 	}
 	ds.pods.Range(deleteFn)
-}
 
-func (ds *datastore) PodDelete(namespacedName types.NamespacedName) {
-	v, ok := ds.pods.LoadAndDelete(namespacedName)
-	if ok {
-		pmr := v.(backendmetrics.PodMetrics)
-		pmr.StopRefreshLoop()
-	}
+	return nil
 }
 
 func selectorFromInferencePoolSelector(selector map[v1alpha2.LabelKey]v1alpha2.LabelValue) labels.Selector {

pkg/epp/datastore/datastore_test.go

@@ -27,7 +27,10 @@ import (
 	"github.com/stretchr/testify/assert"
 	corev1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/types"
+	clientgoscheme "k8s.io/client-go/kubernetes/scheme"
+	"sigs.k8s.io/controller-runtime/pkg/client/fake"
 	"sigs.k8s.io/gateway-api-inference-extension/api/v1alpha2"
 	backendmetrics "sigs.k8s.io/gateway-api-inference-extension/pkg/epp/backend/metrics"
 	testutil "sigs.k8s.io/gateway-api-inference-extension/pkg/epp/util/testing"
@@ -71,9 +74,15 @@ func TestPool(t *testing.T) {
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
+			// Set up the scheme.
+			scheme := runtime.NewScheme()
+			_ = clientgoscheme.AddToScheme(scheme)
+			fakeClient := fake.NewClientBuilder().
+				WithScheme(scheme).
+				Build()
 			pmf := backendmetrics.NewPodMetricsFactory(&backendmetrics.FakePodMetricsClient{}, time.Second)
 			datastore := NewDatastore(context.Background(), pmf)
-			datastore.PoolSet(tt.inferencePool)
+			datastore.PoolSet(context.Background(), fakeClient, tt.inferencePool)
 			gotPool, gotErr := datastore.PoolGet()
 			if diff := cmp.Diff(tt.wantErr, gotErr, cmpopts.EquateErrors()); diff != "" {
 				t.Errorf("Unexpected error diff (+got/-want): %s", diff)
@@ -320,9 +329,15 @@ func TestMetrics(t *testing.T) {
 		t.Run(test.name, func(t *testing.T) {
 			ctx, cancel := context.WithCancel(context.Background())
 			defer cancel()
+			// Set up the scheme.
+			scheme := runtime.NewScheme()
+			_ = clientgoscheme.AddToScheme(scheme)
+			fakeClient := fake.NewClientBuilder().
+				WithScheme(scheme).
+				Build()
 			pmf := backendmetrics.NewPodMetricsFactory(test.pmc, time.Millisecond)
 			ds := NewDatastore(ctx, pmf)
-			ds.PoolSet(inferencePool)
+			ds.PoolSet(ctx, fakeClient, inferencePool)
 			for _, pod := range test.storePods {
 				ds.PodUpdateOrAddIfNotExist(pod, inferencePool)
 			}

pkg/epp/util/pod/pod.go

@@ -21,6 +21,9 @@ import (
 )
 
 func IsPodReady(pod *corev1.Pod) bool {
+	if !pod.DeletionTimestamp.IsZero() {
+		return false
+	}
 	for _, condition := range pod.Status.Conditions {
 		if condition.Type == corev1.PodReady {
 			if condition.Status == corev1.ConditionTrue {