issue-4613: Add support for cache enhancements with informers (#5484)

Signed-off-by: Pratik Shah <pratik@infracloud.io>

Signed-off-by: Pratik Shah <pratik@infracloud.io>

cmd/kyverno/main.go

@@ -33,6 +33,7 @@ import (
 	resourcereportcontroller "github.com/kyverno/kyverno/pkg/controllers/report/resource"
 	webhookcontroller "github.com/kyverno/kyverno/pkg/controllers/webhook"
 	"github.com/kyverno/kyverno/pkg/cosign"
+	"github.com/kyverno/kyverno/pkg/engine/context/resolvers"
 	event "github.com/kyverno/kyverno/pkg/event"
 	"github.com/kyverno/kyverno/pkg/leaderelection"
 	"github.com/kyverno/kyverno/pkg/logging"
@@ -407,6 +408,26 @@ func main() {
 	kubeInformer := kubeinformers.NewSharedInformerFactory(kubeClient, resyncPeriod)
 	kubeKyvernoInformer := kubeinformers.NewSharedInformerFactoryWithOptions(kubeClient, resyncPeriod, kubeinformers.WithNamespace(config.KyvernoNamespace()))
 	kyvernoInformer := kyvernoinformer.NewSharedInformerFactory(kyvernoClient, resyncPeriod)
+	cacheInformer, err := resolvers.GetCacheInformerFactory(kubeClient, resyncPeriod)
+	if err != nil {
+		logger.Error(err, "failed to create cache informer factory")
+		os.Exit(1)
+	}
+	informerBasedResolver, err := resolvers.NewInformerBasedResolver(cacheInformer.Core().V1().ConfigMaps().Lister())
+	if err != nil {
+		logger.Error(err, "failed to create informer based resolver")
+		os.Exit(1)
+	}
+	clientBasedResolver, err := resolvers.NewClientBasedResolver(kubeClient)
+	if err != nil {
+		logger.Error(err, "failed to create client based resolver")
+		os.Exit(1)
+	}
+	configMapResolver, err := resolvers.NewResolverChain(informerBasedResolver, clientBasedResolver)
+	if err != nil {
+		logger.Error(err, "failed to create config map resolver")
+		os.Exit(1)
+	}
 	configuration, err := config.NewConfiguration(kubeClient)
 	if err != nil {
 		logger.Error(err, "failed to initialize configuration")
@@ -459,7 +480,7 @@ func main() {
 		openApiManager,
 	)
 	// start informers and wait for cache sync
-	if !internal.StartInformersAndWaitForCacheSync(signalCtx, kyvernoInformer, kubeInformer, kubeKyvernoInformer) {
+	if !internal.StartInformersAndWaitForCacheSync(signalCtx, kyvernoInformer, kubeInformer, kubeKyvernoInformer, cacheInformer) {
 		logger.Error(errors.New("failed to wait for cache sync"), "failed to wait for cache sync")
 		os.Exit(1)
 	}
@@ -575,6 +596,7 @@ func main() {
 		configuration,
 		metricsConfig,
 		policyCache,
+		configMapResolver,
 		kubeInformer.Core().V1().Namespaces().Lister(),
 		kubeInformer.Rbac().V1().RoleBindings().Lister(),
 		kubeInformer.Rbac().V1().ClusterRoleBindings().Lister(),
@@ -607,7 +629,7 @@ func main() {
 	)
 	// start informers and wait for cache sync
 	// we need to call start again because we potentially registered new informers
-	if !internal.StartInformersAndWaitForCacheSync(signalCtx, kyvernoInformer, kubeInformer, kubeKyvernoInformer) {
+	if !internal.StartInformersAndWaitForCacheSync(signalCtx, kyvernoInformer, kubeInformer, kubeKyvernoInformer, cacheInformer) {
 		logger.Error(errors.New("failed to wait for cache sync"), "failed to wait for cache sync")
 		os.Exit(1)
 	}

pkg/engine/context/resolvers/constants.go

@@ -0,0 +1,7 @@
+package resolvers
+
+const (
+	TEST_NAMESPACE = "default"
+	TEST_CONFIGMAP = "myconfigmap"
+	LabelCacheKey  = "cache.kyverno.io/enabled"
+)

pkg/engine/context/resolvers/resolvers.go

@@ -0,0 +1,70 @@
+package resolvers
+
+import (
+	"context"
+	"errors"
+
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/kubernetes"
+	corev1listers "k8s.io/client-go/listers/core/v1"
+)
+
+type informerBasedResolver struct {
+	lister corev1listers.ConfigMapLister
+}
+
+func NewInformerBasedResolver(lister corev1listers.ConfigMapLister) (ConfigmapResolver, error) {
+	if lister == nil {
+		return nil, errors.New("lister must not be nil")
+	}
+	return &informerBasedResolver{lister}, nil
+}
+
+func (i *informerBasedResolver) Get(ctx context.Context, namespace, name string) (*corev1.ConfigMap, error) {
+	return i.lister.ConfigMaps(namespace).Get(name)
+}
+
+type clientBasedResolver struct {
+	kubeClient kubernetes.Interface
+}
+
+func NewClientBasedResolver(client kubernetes.Interface) (ConfigmapResolver, error) {
+	if client == nil {
+		return nil, errors.New("client must not be nil")
+	}
+	return &clientBasedResolver{client}, nil
+}
+
+func (c *clientBasedResolver) Get(ctx context.Context, namespace, name string) (*corev1.ConfigMap, error) {
+	return c.kubeClient.CoreV1().ConfigMaps(namespace).Get(ctx, name, metav1.GetOptions{})
+}
+
+type resolverChain []ConfigmapResolver
+
+func NewResolverChain(resolvers ...ConfigmapResolver) (ConfigmapResolver, error) {
+	if len(resolvers) == 0 {
+		return nil, errors.New("no resolvers")
+	}
+	for _, resolver := range resolvers {
+		if resolver == nil {
+			return nil, errors.New("at least one resolver is nil")
+		}
+	}
+	return resolverChain(resolvers), nil
+}
+
+func (chain resolverChain) Get(ctx context.Context, namespace, name string) (*corev1.ConfigMap, error) {
+	// if CM is not found in informer cache, error will be stored in
+	// lastErr variable and resolver chain will try to get CM using
+	// Kubernetes client
+	var lastErr error
+	for _, resolver := range chain {
+		cm, err := resolver.Get(ctx, namespace, name)
+		if err == nil {
+			return cm, nil
+		}
+		lastErr = err
+	}
+	return nil, lastErr
+}

pkg/engine/context/resolvers/resolvers_test.go

@@ -0,0 +1,230 @@
+package resolvers
+
+import (
+	"context"
+	"reflect"
+	"testing"
+	"time"
+
+	"gotest.tools/assert"
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	kubeinformers "k8s.io/client-go/informers"
+	"k8s.io/client-go/kubernetes"
+	kubefake "k8s.io/client-go/kubernetes/fake"
+	corev1listers "k8s.io/client-go/listers/core/v1"
+)
+
+func newEmptyFakeClient() *kubefake.Clientset {
+	return kubefake.NewSimpleClientset()
+}
+
+func createConfigMaps(ctx context.Context, client *kubefake.Clientset, addLabel bool) error {
+	cm := &corev1.ConfigMap{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      TEST_CONFIGMAP,
+			Namespace: TEST_NAMESPACE,
+		},
+		Data: map[string]string{"configmapkey": "key1"},
+	}
+	if addLabel {
+		cm.ObjectMeta.Labels = map[string]string{LabelCacheKey: "true"}
+	}
+	_, err := client.CoreV1().ConfigMaps(TEST_NAMESPACE).Create(
+		ctx, cm, metav1.CreateOptions{})
+	return err
+}
+
+func initialiseInformer(client *kubefake.Clientset) kubeinformers.SharedInformerFactory {
+	selector, err := GetCacheSelector()
+	if err != nil {
+		return nil
+	}
+	labelOptions := kubeinformers.WithTweakListOptions(func(opts *metav1.ListOptions) {
+		opts.LabelSelector = selector.String()
+	})
+	kubeResourceInformer := kubeinformers.NewSharedInformerFactoryWithOptions(client, 15*time.Minute, labelOptions)
+	return kubeResourceInformer
+}
+
+func Test_InformerCacheSuccess(t *testing.T) {
+	client := newEmptyFakeClient()
+	ctx := context.TODO()
+	err := createConfigMaps(ctx, client, true)
+	assert.NilError(t, err, "error while creating configmap")
+	informer := initialiseInformer(client)
+	informerResolver, err := NewInformerBasedResolver(informer.Core().V1().ConfigMaps().Lister())
+	assert.NilError(t, err)
+	informer.Start(make(<-chan struct{}))
+	time.Sleep(10 * time.Second)
+	_, err = informerResolver.Get(ctx, TEST_NAMESPACE, TEST_CONFIGMAP)
+	assert.NilError(t, err, "informer didn't have expected configmap")
+}
+
+func Test_InformerCacheFailure(t *testing.T) {
+	client := newEmptyFakeClient()
+	ctx := context.TODO()
+	err := createConfigMaps(ctx, client, false)
+	assert.NilError(t, err, "error while creating configmap")
+	informer := initialiseInformer(client)
+	resolver, err := NewInformerBasedResolver(informer.Core().V1().ConfigMaps().Lister())
+	assert.NilError(t, err)
+	informer.Start(make(<-chan struct{}))
+	time.Sleep(10 * time.Second)
+	_, err = resolver.Get(ctx, TEST_NAMESPACE, TEST_CONFIGMAP)
+	assert.Equal(t, err.Error(), "configmap \"myconfigmap\" not found")
+}
+
+func Test_ClientBasedResolver(t *testing.T) {
+	client := newEmptyFakeClient()
+	ctx := context.TODO()
+	err := createConfigMaps(ctx, client, false)
+	assert.NilError(t, err, "error while creating configmap")
+	resolver, err := NewClientBasedResolver(client)
+	assert.NilError(t, err)
+	_, err = resolver.Get(ctx, TEST_NAMESPACE, TEST_CONFIGMAP)
+	assert.NilError(t, err, "error while getting configmap from client")
+}
+
+func Test_ResolverChainWithExistingConfigMap(t *testing.T) {
+	client := newEmptyFakeClient()
+	informer := initialiseInformer(client)
+	lister := informer.Core().V1().ConfigMaps().Lister()
+	informerBasedResolver, err := NewInformerBasedResolver(lister)
+	assert.NilError(t, err)
+	clientBasedResolver, err := NewClientBasedResolver(client)
+	assert.NilError(t, err)
+	resolvers, err := NewResolverChain(informerBasedResolver, clientBasedResolver)
+	assert.NilError(t, err)
+	ctx := context.TODO()
+	err = createConfigMaps(ctx, client, true)
+	assert.NilError(t, err, "error while creating configmap")
+	_, err = resolvers.Get(ctx, TEST_NAMESPACE, TEST_CONFIGMAP)
+	assert.NilError(t, err, "error while getting configmap")
+}
+
+func Test_ResolverChainWithNonExistingConfigMap(t *testing.T) {
+	client := newEmptyFakeClient()
+	informer := initialiseInformer(client)
+	lister := informer.Core().V1().ConfigMaps().Lister()
+	informerBasedResolver, err := NewInformerBasedResolver(lister)
+	assert.NilError(t, err)
+	clientBasedResolver, err := NewClientBasedResolver(client)
+	assert.NilError(t, err)
+	resolvers, err := NewResolverChain(informerBasedResolver, clientBasedResolver)
+	assert.NilError(t, err)
+	ctx := context.TODO()
+	_, err = resolvers.Get(ctx, TEST_NAMESPACE, TEST_CONFIGMAP)
+	assert.Error(t, err, "configmaps \"myconfigmap\" not found")
+}
+
+func TestNewInformerBasedResolver(t *testing.T) {
+	type args struct {
+		lister corev1listers.ConfigMapLister
+	}
+	client := newEmptyFakeClient()
+	informer := initialiseInformer(client)
+	lister := informer.Core().V1().ConfigMaps().Lister()
+	tests := []struct {
+		name    string
+		args    args
+		want    ConfigmapResolver
+		wantErr bool
+	}{{
+		name:    "nil shoud return an error",
+		wantErr: true,
+	}, {
+		name: "not nil",
+		args: args{lister},
+		want: &informerBasedResolver{lister},
+	}}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := NewInformerBasedResolver(tt.args.lister)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("NewInformerBasedResolver() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("NewInformerBasedResolver() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestNewClientBasedResolver(t *testing.T) {
+	type args struct {
+		client kubernetes.Interface
+	}
+	client := newEmptyFakeClient()
+	tests := []struct {
+		name    string
+		args    args
+		want    ConfigmapResolver
+		wantErr bool
+	}{{
+		name:    "nil shoud return an error",
+		wantErr: true,
+	}, {
+		name: "not nil",
+		args: args{client},
+		want: &clientBasedResolver{client},
+	}}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := NewClientBasedResolver(tt.args.client)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("NewClientBasedResolver() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("NewClientBasedResolver() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+type dummyResolver struct{}
+
+func (c dummyResolver) Get(context.Context, string, string) (*corev1.ConfigMap, error) {
+	return nil, nil
+}
+
+func TestNewResolverChain(t *testing.T) {
+	type args struct {
+		resolvers []ConfigmapResolver
+	}
+	tests := []struct {
+		name    string
+		args    args
+		want    ConfigmapResolver
+		wantErr bool
+	}{{
+		name:    "nil shoud return an error",
+		wantErr: true,
+	}, {
+		name:    "empty list shoud return an error",
+		args:    args{[]ConfigmapResolver{}},
+		wantErr: true,
+	}, {
+		name:    "one nil in the list shoud return an error",
+		args:    args{[]ConfigmapResolver{dummyResolver{}, nil}},
+		wantErr: true,
+	}, {
+		name: "no nil",
+		args: args{[]ConfigmapResolver{dummyResolver{}, dummyResolver{}, dummyResolver{}}},
+		want: resolverChain{dummyResolver{}, dummyResolver{}, dummyResolver{}},
+	}}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := NewResolverChain(tt.args.resolvers...)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("NewResolverChain() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("NewResolverChain() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}

pkg/engine/context/resolvers/types.go

@@ -0,0 +1,13 @@
+package resolvers
+
+import (
+	"context"
+
+	corev1 "k8s.io/api/core/v1"
+)
+
+type NamespacedResourceResolver[T any] interface {
+	Get(context.Context, string, string) (T, error)
+}
+
+type ConfigmapResolver = NamespacedResourceResolver[*corev1.ConfigMap]

pkg/engine/context/resolvers/utils.go

@@ -0,0 +1,38 @@
+package resolvers
+
+import (
+	"errors"
+	"time"
+
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/labels"
+	"k8s.io/apimachinery/pkg/selection"
+	kubeinformers "k8s.io/client-go/informers"
+	"k8s.io/client-go/kubernetes"
+)
+
+func GetCacheSelector() (labels.Selector, error) {
+	selector := labels.Everything()
+	requirement, err := labels.NewRequirement(LabelCacheKey, selection.Exists, nil)
+	if err != nil {
+		return nil, err
+	}
+	return selector.Add(*requirement), err
+}
+
+func GetCacheInformerFactory(client kubernetes.Interface, resyncPeriod time.Duration) (kubeinformers.SharedInformerFactory, error) {
+	if client == nil {
+		return nil, errors.New("client cannot be nil")
+	}
+	selector, err := GetCacheSelector()
+	if err != nil {
+		return nil, err
+	}
+	return kubeinformers.NewSharedInformerFactoryWithOptions(
+		client,
+		resyncPeriod,
+		kubeinformers.WithTweakListOptions(func(opts *metav1.ListOptions) {
+			opts.LabelSelector = selector.String()
+		}),
+	), nil
+}

pkg/engine/context/resolvers/utils_test.go

@@ -0,0 +1,58 @@
+package resolvers
+
+import (
+	"reflect"
+	"testing"
+	"time"
+
+	"k8s.io/client-go/kubernetes"
+)
+
+func TestGetCacheSelector(t *testing.T) {
+	tests := []struct {
+		name    string
+		want    string
+		wantErr bool
+	}{{
+		name: "ok",
+		want: LabelCacheKey,
+	}}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := GetCacheSelector()
+			if (err != nil) != tt.wantErr {
+				t.Errorf("GetCacheSelector() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if !reflect.DeepEqual(got.String(), tt.want) {
+				t.Errorf("GetCacheSelector() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestGetCacheInformerFactory(t *testing.T) {
+	tests := []struct {
+		name    string
+		want    string
+		client  kubernetes.Interface
+		wantErr bool
+	}{{
+		name:    "nil client",
+		wantErr: true,
+		client:  nil,
+	}, {
+		name:    "ok",
+		wantErr: false,
+		client:  newEmptyFakeClient(),
+	}}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			_, err := GetCacheInformerFactory(tt.client, 10*time.Minute)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("GetCacheInformerFactor() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+		})
+	}
+}

pkg/engine/imageVerify_test.go

@@ -8,11 +8,12 @@ import (
 
 	"github.com/kyverno/kyverno/pkg/logging"
 	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+	kubefake "k8s.io/client-go/kubernetes/fake"
 
 	kyverno "github.com/kyverno/kyverno/api/kyverno/v1"
-	client "github.com/kyverno/kyverno/pkg/clients/dclient"
 	"github.com/kyverno/kyverno/pkg/cosign"
 	"github.com/kyverno/kyverno/pkg/engine/context"
+	"github.com/kyverno/kyverno/pkg/engine/context/resolvers"
 	"github.com/kyverno/kyverno/pkg/engine/response"
 	"github.com/kyverno/kyverno/pkg/engine/utils"
 	"gotest.tools/assert"
@@ -418,11 +419,13 @@ func Test_ConfigMapMissingSuccess(t *testing.T) {
 func Test_ConfigMapMissingFailure(t *testing.T) {
 	ghcrImage := strings.Replace(testConfigMapMissingResource, "nginx:latest", "ghcr.io/kyverno/test-verify-image:signed", -1)
 	policyContext := buildContext(t, testConfigMapMissing, ghcrImage, "")
-	policyContext.client = client.NewEmptyFakeClient()
+	resolver, err := resolvers.NewClientBasedResolver(kubefake.NewSimpleClientset())
+	assert.NilError(t, err)
+	policyContext.informerCacheResolvers = resolver
 	cosign.ClearMock()
-	err, _ := VerifyAndPatchImages(policyContext)
-	assert.Equal(t, len(err.PolicyResponse.Rules), 1)
-	assert.Equal(t, err.PolicyResponse.Rules[0].Status, response.RuleStatusError, err.PolicyResponse.Rules[0].Message)
+	resp, _ := VerifyAndPatchImages(policyContext)
+	assert.Equal(t, len(resp.PolicyResponse.Rules), 1)
+	assert.Equal(t, resp.PolicyResponse.Rules[0].Status, response.RuleStatusError, resp.PolicyResponse.Rules[0].Message)
 }
 
 func Test_SignatureGoodSigned(t *testing.T) {

pkg/engine/jsonContext.go

@@ -351,16 +351,14 @@ func fetchConfigMap(logger logr.Logger, entry kyvernov1.ContextEntry, ctx *Polic
 		namespace = "default"
 	}
 
-	obj, err := ctx.client.GetResource(context.TODO(), "v1", "ConfigMap", namespace.(string), name.(string))
+	obj, err := ctx.informerCacheResolvers.Get(context.TODO(), namespace.(string), name.(string))
 	if err != nil {
 		return nil, fmt.Errorf("failed to get configmap %s/%s : %v", namespace, name, err)
 	}
 
-	unstructuredObj := obj.DeepCopy().Object
-
 	// extract configmap data
-	contextData["data"] = unstructuredObj["data"]
-	contextData["metadata"] = unstructuredObj["metadata"]
+	contextData["data"] = obj.Data
+	contextData["metadata"] = obj.ObjectMeta
 	data, err := json.Marshal(contextData)
 	if err != nil {
 		return nil, fmt.Errorf("failed to unmarshal configmap %s/%s: %v", namespace, name, err)

pkg/engine/policyContext.go

@@ -7,6 +7,7 @@ import (
 	"github.com/kyverno/kyverno/pkg/config"
 	"github.com/kyverno/kyverno/pkg/engine/context"
 	enginectx "github.com/kyverno/kyverno/pkg/engine/context"
+	"github.com/kyverno/kyverno/pkg/engine/context/resolvers"
 	"github.com/kyverno/kyverno/pkg/utils"
 	"github.com/pkg/errors"
 	admissionv1 "k8s.io/api/admission/v1"
@@ -49,6 +50,9 @@ type PolicyContext struct {
 
 	// admissionOperation represents if the caller is from the webhook server
 	admissionOperation bool
+
+	// informerCacheResolvers - used to get resources from informer cache
+	informerCacheResolvers resolvers.ConfigmapResolver
 }
 
 // Getters
@@ -137,6 +141,12 @@ func (c *PolicyContext) WithAdmissionOperation(admissionOperation bool) *PolicyC
 	return copy
 }
 
+func (c *PolicyContext) WithInformerCacheResolver(informerCacheResolver resolvers.ConfigmapResolver) *PolicyContext {
+	copy := c.Copy()
+	copy.informerCacheResolvers = informerCacheResolver
+	return copy
+}
+
 // Constructors
 
 func NewPolicyContextWithJsonContext(jsonContext context.Interface) *PolicyContext {
@@ -158,6 +168,7 @@ func NewPolicyContextFromAdmissionRequest(
 	admissionInfo kyvernov1beta1.RequestInfo,
 	configuration config.Configuration,
 	client dclient.Interface,
+	informerCacheResolver resolvers.ConfigmapResolver,
 ) (*PolicyContext, error) {
 	ctx, err := newVariablesContext(request, &admissionInfo)
 	if err != nil {
@@ -176,7 +187,8 @@ func NewPolicyContextFromAdmissionRequest(
 		WithAdmissionInfo(admissionInfo).
 		WithConfiguration(configuration).
 		WithClient(client).
-		WithAdmissionOperation(true)
+		WithAdmissionOperation(true).
+		WithInformerCacheResolver(informerCacheResolver)
 	return policyContext, nil
 }
 

pkg/webhooks/resource/fake.go

@@ -7,6 +7,7 @@ import (
 	kyvernoinformers "github.com/kyverno/kyverno/pkg/client/informers/externalversions"
 	"github.com/kyverno/kyverno/pkg/clients/dclient"
 	"github.com/kyverno/kyverno/pkg/config"
+	"github.com/kyverno/kyverno/pkg/engine/context/resolvers"
 	"github.com/kyverno/kyverno/pkg/event"
 	"github.com/kyverno/kyverno/pkg/metrics"
 	"github.com/kyverno/kyverno/pkg/openapi"
@@ -14,7 +15,7 @@ import (
 	"github.com/kyverno/kyverno/pkg/webhooks"
 	"github.com/kyverno/kyverno/pkg/webhooks/updaterequest"
 	webhookutils "github.com/kyverno/kyverno/pkg/webhooks/utils"
-	"k8s.io/client-go/informers"
+	kubeinformers "k8s.io/client-go/informers"
 	"k8s.io/client-go/kubernetes/fake"
 )
 
@@ -22,11 +23,12 @@ func NewFakeHandlers(ctx context.Context, policyCache policycache.Cache) webhook
 	client := fake.NewSimpleClientset()
 	metricsConfig := metrics.NewFakeMetricsConfig()
 
-	informers := informers.NewSharedInformerFactory(client, 0)
+	informers := kubeinformers.NewSharedInformerFactory(client, 0)
 	informers.Start(ctx.Done())
 
 	kyvernoclient := fakekyvernov1.NewSimpleClientset()
 	kyvernoInformers := kyvernoinformers.NewSharedInformerFactory(kyvernoclient, 0)
+	configMapResolver, _ := resolvers.NewClientBasedResolver(client)
 	kyvernoInformers.Start(ctx.Done())
 
 	dclient := dclient.NewEmptyFakeClient()
@@ -47,7 +49,7 @@ func NewFakeHandlers(ctx context.Context, policyCache policycache.Cache) webhook
 		urGenerator:    updaterequest.NewFake(),
 		eventGen:       event.NewFake(),
 		openApiManager: openapi.NewFake(),
-		pcBuilder:      webhookutils.NewPolicyContextBuilder(configuration, dclient, rbLister, crbLister),
+		pcBuilder:      webhookutils.NewPolicyContextBuilder(configuration, dclient, rbLister, crbLister, configMapResolver),
 		urUpdater:      webhookutils.NewUpdateRequestUpdater(kyvernoclient, urLister),
 	}
 }

pkg/webhooks/resource/handlers.go

@@ -14,6 +14,7 @@ import (
 	"github.com/kyverno/kyverno/pkg/common"
 	"github.com/kyverno/kyverno/pkg/config"
 	enginectx "github.com/kyverno/kyverno/pkg/engine/context"
+	"github.com/kyverno/kyverno/pkg/engine/context/resolvers"
 	engineutils2 "github.com/kyverno/kyverno/pkg/engine/utils"
 	"github.com/kyverno/kyverno/pkg/event"
 	"github.com/kyverno/kyverno/pkg/metrics"
@@ -66,6 +67,7 @@ func NewHandlers(
 	configuration config.Configuration,
 	metricsConfig metrics.MetricsConfigManager,
 	pCache policycache.Cache,
+	informerCacheResolvers resolvers.ConfigmapResolver,
 	nsLister corev1listers.NamespaceLister,
 	rbLister rbacv1listers.RoleBindingLister,
 	crbLister rbacv1listers.ClusterRoleBindingLister,
@@ -88,7 +90,7 @@ func NewHandlers(
 		urGenerator:      urGenerator,
 		eventGen:         eventGen,
 		openApiManager:   openApiManager,
-		pcBuilder:        webhookutils.NewPolicyContextBuilder(configuration, client, rbLister, crbLister),
+		pcBuilder:        webhookutils.NewPolicyContextBuilder(configuration, client, rbLister, crbLister, informerCacheResolvers),
 		urUpdater:        webhookutils.NewUpdateRequestUpdater(kyvernoClient, urLister),
 		admissionReports: admissionReports,
 	}

pkg/webhooks/utils/policy_context_builder.go

@@ -5,6 +5,7 @@ import (
 	"github.com/kyverno/kyverno/pkg/clients/dclient"
 	"github.com/kyverno/kyverno/pkg/config"
 	"github.com/kyverno/kyverno/pkg/engine"
+	"github.com/kyverno/kyverno/pkg/engine/context/resolvers"
 	"github.com/kyverno/kyverno/pkg/userinfo"
 	"github.com/pkg/errors"
 	admissionv1 "k8s.io/api/admission/v1"
@@ -20,6 +21,7 @@ type policyContextBuilder struct {
 	client                 dclient.Interface
 	rbLister               rbacv1listers.RoleBindingLister
 	crbLister              rbacv1listers.ClusterRoleBindingLister
+	informerCacheResolvers resolvers.ConfigmapResolver
 }
 
 func NewPolicyContextBuilder(
@@ -27,12 +29,14 @@ func NewPolicyContextBuilder(
 	client dclient.Interface,
 	rbLister rbacv1listers.RoleBindingLister,
 	crbLister rbacv1listers.ClusterRoleBindingLister,
+	informerCacheResolvers resolvers.ConfigmapResolver,
 ) PolicyContextBuilder {
 	return &policyContextBuilder{
 		configuration:          configuration,
 		client:                 client,
 		rbLister:               rbLister,
 		crbLister:              crbLister,
+		informerCacheResolvers: informerCacheResolvers,
 	}
 }
 
@@ -46,5 +50,5 @@ func (b *policyContextBuilder) Build(request *admissionv1.AdmissionRequest) (*en
 		userRequestInfo.Roles = roles
 		userRequestInfo.ClusterRoles = clusterRoles
 	}
-	return engine.NewPolicyContextFromAdmissionRequest(request, userRequestInfo, b.configuration, b.client)
+	return engine.NewPolicyContextFromAdmissionRequest(request, userRequestInfo, b.configuration, b.client, b.informerCacheResolvers)
 }