Update custom-metrics-apiserver and metrics-server

vendor/k8s.io/apiserver/pkg/endpoints/handlers/fieldmanager/managedfieldsupdater.go

@@ -0,0 +1,82 @@
+/*
+Copyright 2020 The Kubernetes 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 fieldmanager
+
+import (
+	"time"
+
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	"sigs.k8s.io/structured-merge-diff/v3/fieldpath"
+)
+
+type managedFieldsUpdater struct {
+	fieldManager Manager
+}
+
+var _ Manager = &managedFieldsUpdater{}
+
+// NewManagedFieldsUpdater is responsible for updating the managedfields
+// in the object, updating the time of the operation as necessary. For
+// updates, it uses a hard-coded manager to detect if things have
+// changed, and swaps back the correct manager after the operation is
+// done.
+func NewManagedFieldsUpdater(fieldManager Manager) Manager {
+	return &managedFieldsUpdater{
+		fieldManager: fieldManager,
+	}
+}
+
+// Update implements Manager.
+func (f *managedFieldsUpdater) Update(liveObj, newObj runtime.Object, managed Managed, manager string) (runtime.Object, Managed, error) {
+	self := "current-operation"
+	object, managed, err := f.fieldManager.Update(liveObj, newObj, managed, self)
+	if err != nil {
+		return object, managed, err
+	}
+
+	// If the current operation took any fields from anything, it means the object changed,
+	// so update the timestamp of the managedFieldsEntry and merge with any previous updates from the same manager
+	if vs, ok := managed.Fields()[self]; ok {
+		delete(managed.Fields(), self)
+
+		managed.Times()[manager] = &metav1.Time{Time: time.Now().UTC()}
+		if previous, ok := managed.Fields()[manager]; ok {
+			managed.Fields()[manager] = fieldpath.NewVersionedSet(vs.Set().Union(previous.Set()), vs.APIVersion(), vs.Applied())
+		} else {
+			managed.Fields()[manager] = vs
+		}
+	}
+
+	return object, managed, nil
+}
+
+// Apply implements Manager.
+func (f *managedFieldsUpdater) Apply(liveObj, appliedObj runtime.Object, managed Managed, fieldManager string, force bool) (runtime.Object, Managed, error) {
+	formerManaged := managed.Fields().Copy()
+	object, managed, err := f.fieldManager.Apply(liveObj, appliedObj, managed, fieldManager, force)
+	if err != nil {
+		return object, managed, err
+	}
+	if object != nil || !managed.Fields().Equals(formerManaged) {
+		managed.Times()[fieldManager] = &metav1.Time{Time: time.Now().UTC()}
+	}
+	if object == nil {
+		object = liveObj
+	}
+	return object, managed, nil
+}