upgrade to istio 1.19 (#1211)

Co-authored-by: CH3CHO <ch3cho@qq.com>
Co-authored-by: rinfx <893383980@qq.com>

pkg/ingress/kube/util/transformer.go

@@ -0,0 +1,84 @@
+// Copyright Istio Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+package util
+
+import (
+	"istio.io/istio/pilot/pkg/util/informermetric"
+	"istio.io/istio/pkg/config/schema/kubeclient"
+	"istio.io/istio/pkg/kube/informerfactory"
+	ktypes "istio.io/istio/pkg/kube/kubetypes"
+	"istio.io/istio/pkg/log"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apimachinery/pkg/watch"
+	"k8s.io/client-go/tools/cache"
+)
+
+func GetInformerFiltered(
+	c kubeclient.ClientGetter,
+	opts ktypes.InformerOptions,
+	g schema.GroupVersionResource,
+	exampleObject runtime.Object,
+	l func(options metav1.ListOptions) (runtime.Object, error),
+	w func(options metav1.ListOptions) (watch.Interface, error),
+) informerfactory.StartableInformer {
+	return c.Informers().InformerFor(g, opts, func() cache.SharedIndexInformer {
+		inf := cache.NewSharedIndexInformer(
+			&cache.ListWatch{
+				ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
+					options.FieldSelector = opts.FieldSelector
+					options.LabelSelector = opts.LabelSelector
+					return l(options)
+				},
+				WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
+					options.FieldSelector = opts.FieldSelector
+					options.LabelSelector = opts.LabelSelector
+					return w(options)
+				},
+			},
+			exampleObject,
+			0,
+			cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc},
+		)
+		setupInformer(opts, inf)
+		return inf
+	})
+}
+
+func setupInformer(opts ktypes.InformerOptions, inf cache.SharedIndexInformer) {
+	// It is important to set this in the newFunc rather than after InformerFor to avoid
+	// https://github.com/kubernetes/kubernetes/issues/117869
+	if opts.ObjectTransform != nil {
+		_ = inf.SetTransform(opts.ObjectTransform)
+	} else {
+		_ = inf.SetTransform(stripUnusedFields)
+	}
+	if err := inf.SetWatchErrorHandler(informermetric.ErrorHandlerForCluster(opts.Cluster)); err != nil {
+		log.Debugf("failed to set watch handler, informer may already be started: %v", err)
+	}
+}
+
+// stripUnusedFields is the transform function for shared informers,
+// it removes unused fields from objects before they are stored in the cache to save memory.
+func stripUnusedFields(obj any) (any, error) {
+	t, ok := obj.(metav1.ObjectMetaAccessor)
+	if !ok {
+		// shouldn't happen
+		return obj, nil
+	}
+	// ManagedFields is large and we never use it
+	t.GetObjectMeta().SetManagedFields(nil)
+	return obj, nil
+}