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structuredmerge.go
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structuredmerge.go
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/*
Copyright 2019 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 (
"fmt"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apiserver/pkg/endpoints/handlers/fieldmanager/internal"
"sigs.k8s.io/structured-merge-diff/v4/fieldpath"
"sigs.k8s.io/structured-merge-diff/v4/merge"
)
type structuredMergeManager struct {
typeConverter TypeConverter
objectConverter runtime.ObjectConvertor
objectDefaulter runtime.ObjectDefaulter
groupVersion schema.GroupVersion
hubVersion schema.GroupVersion
updater merge.Updater
}
var _ Manager = &structuredMergeManager{}
// NewStructuredMergeManager creates a new Manager that merges apply requests
// and update managed fields for other types of requests.
func NewStructuredMergeManager(typeConverter TypeConverter, objectConverter runtime.ObjectConvertor, objectDefaulter runtime.ObjectDefaulter, gv schema.GroupVersion, hub schema.GroupVersion, resetFields map[fieldpath.APIVersion]*fieldpath.Set) (Manager, error) {
return &structuredMergeManager{
typeConverter: typeConverter,
objectConverter: objectConverter,
objectDefaulter: objectDefaulter,
groupVersion: gv,
hubVersion: hub,
updater: merge.Updater{
Converter: newVersionConverter(typeConverter, objectConverter, hub), // This is the converter provided to SMD from k8s
IgnoredFields: resetFields,
},
}, nil
}
// NewCRDStructuredMergeManager creates a new Manager specifically for
// CRDs. This allows for the possibility of fields which are not defined
// in models, as well as having no models defined at all.
func NewCRDStructuredMergeManager(typeConverter TypeConverter, objectConverter runtime.ObjectConvertor, objectDefaulter runtime.ObjectDefaulter, gv schema.GroupVersion, hub schema.GroupVersion, resetFields map[fieldpath.APIVersion]*fieldpath.Set) (_ Manager, err error) {
return &structuredMergeManager{
typeConverter: typeConverter,
objectConverter: objectConverter,
objectDefaulter: objectDefaulter,
groupVersion: gv,
hubVersion: hub,
updater: merge.Updater{
Converter: newCRDVersionConverter(typeConverter, objectConverter, hub),
IgnoredFields: resetFields,
},
}, nil
}
func objectGVKNN(obj runtime.Object) string {
name := "<unknown>"
namespace := "<unknown>"
if accessor, err := meta.Accessor(obj); err == nil {
name = accessor.GetName()
namespace = accessor.GetNamespace()
}
return fmt.Sprintf("%v/%v; %v", namespace, name, obj.GetObjectKind().GroupVersionKind())
}
// Update implements Manager.
func (f *structuredMergeManager) Update(liveObj, newObj runtime.Object, managed Managed, manager string) (runtime.Object, Managed, error) {
newObjVersioned, err := f.toVersioned(newObj)
if err != nil {
return nil, nil, fmt.Errorf("failed to convert new object (%v) to proper version (%v): %v", objectGVKNN(newObj), f.groupVersion, err)
}
liveObjVersioned, err := f.toVersioned(liveObj)
if err != nil {
return nil, nil, fmt.Errorf("failed to convert live object (%v) to proper version: %v", objectGVKNN(liveObj), err)
}
newObjTyped, err := f.typeConverter.ObjectToTyped(newObjVersioned)
if err != nil {
return nil, nil, fmt.Errorf("failed to convert new object (%v) to smd typed: %v", objectGVKNN(newObjVersioned), err)
}
liveObjTyped, err := f.typeConverter.ObjectToTyped(liveObjVersioned)
if err != nil {
return nil, nil, fmt.Errorf("failed to convert live object (%v) to smd typed: %v", objectGVKNN(liveObjVersioned), err)
}
apiVersion := fieldpath.APIVersion(f.groupVersion.String())
// TODO(apelisse) use the first return value when unions are implemented
_, managedFields, err := f.updater.Update(liveObjTyped, newObjTyped, apiVersion, managed.Fields(), manager)
if err != nil {
return nil, nil, fmt.Errorf("failed to update ManagedFields (%v): %v", objectGVKNN(newObjVersioned), err)
}
managed = internal.NewManaged(managedFields, managed.Times())
return newObj, managed, nil
}
// Apply implements Manager.
func (f *structuredMergeManager) Apply(liveObj, patchObj runtime.Object, managed Managed, manager string, force bool) (runtime.Object, Managed, error) {
// Check that the patch object has the same version as the live object
if patchVersion := patchObj.GetObjectKind().GroupVersionKind().GroupVersion(); patchVersion != f.groupVersion {
return nil, nil,
errors.NewBadRequest(
fmt.Sprintf("Incorrect version specified in apply patch. "+
"Specified patch version: %s, expected: %s",
patchVersion, f.groupVersion))
}
patchObjMeta, err := meta.Accessor(patchObj)
if err != nil {
return nil, nil, fmt.Errorf("couldn't get accessor: %v", err)
}
if patchObjMeta.GetManagedFields() != nil {
return nil, nil, errors.NewBadRequest("metadata.managedFields must be nil")
}
liveObjVersioned, err := f.toVersioned(liveObj)
if err != nil {
return nil, nil, fmt.Errorf("failed to convert live object (%v) to proper version: %v", objectGVKNN(liveObj), err)
}
patchObjTyped, err := f.typeConverter.ObjectToTyped(patchObj)
if err != nil {
return nil, nil, fmt.Errorf("failed to create typed patch object (%v): %v", objectGVKNN(patchObj), err)
}
liveObjTyped, err := f.typeConverter.ObjectToTyped(liveObjVersioned)
if err != nil {
return nil, nil, fmt.Errorf("failed to create typed live object (%v): %v", objectGVKNN(liveObjVersioned), err)
}
apiVersion := fieldpath.APIVersion(f.groupVersion.String())
newObjTyped, managedFields, err := f.updater.Apply(liveObjTyped, patchObjTyped, apiVersion, managed.Fields(), manager, force)
if err != nil {
return nil, nil, err
}
managed = internal.NewManaged(managedFields, managed.Times())
if newObjTyped == nil {
return nil, managed, nil
}
newObj, err := f.typeConverter.TypedToObject(newObjTyped)
if err != nil {
return nil, nil, fmt.Errorf("failed to convert new typed object (%v) to object: %v", objectGVKNN(patchObj), err)
}
newObjVersioned, err := f.toVersioned(newObj)
if err != nil {
return nil, nil, fmt.Errorf("failed to convert new object (%v) to proper version: %v", objectGVKNN(patchObj), err)
}
f.objectDefaulter.Default(newObjVersioned)
newObjUnversioned, err := f.toUnversioned(newObjVersioned)
if err != nil {
return nil, nil, fmt.Errorf("failed to convert to unversioned (%v): %v", objectGVKNN(patchObj), err)
}
return newObjUnversioned, managed, nil
}
func (f *structuredMergeManager) toVersioned(obj runtime.Object) (runtime.Object, error) {
return f.objectConverter.ConvertToVersion(obj, f.groupVersion)
}
func (f *structuredMergeManager) toUnversioned(obj runtime.Object) (runtime.Object, error) {
return f.objectConverter.ConvertToVersion(obj, f.hubVersion)
}