mirror of
https://gitea.com/Lydanne/buildx.git
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109 lines
4.4 KiB
Go
109 lines
4.4 KiB
Go
/*
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Copyright 2021 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package managedfields
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import (
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"bytes"
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"fmt"
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"sigs.k8s.io/structured-merge-diff/v4/fieldpath"
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"sigs.k8s.io/structured-merge-diff/v4/typed"
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"k8s.io/apimachinery/pkg/api/meta"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
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"k8s.io/apimachinery/pkg/runtime"
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)
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// ExtractInto extracts the applied configuration state from object for fieldManager
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// into applyConfiguration. If no managed fields are found for the given fieldManager,
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// no error is returned, but applyConfiguration is left unpopulated. It is possible
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// that no managed fields were found for the fieldManager because other field managers
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// have taken ownership of all the fields previously owned by the fieldManager. It is
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// also possible the fieldManager never owned fields.
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//
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// The provided object MUST bo a root resource object since subresource objects
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// do not contain their own managed fields. For example, an autoscaling.Scale
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// object read from a "scale" subresource does not have any managed fields and so
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// cannot be used as the object.
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//
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// If the fields of a subresource are a subset of the fields of the root object,
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// and their field paths and types are exactly the same, then ExtractInto can be
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// called with the root resource as the object and the subresource as the
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// applyConfiguration. This works for "status", obviously, because status is
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// represented by the exact same object as the root resource. This does NOT
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// work, for example, with the "scale" subresources of Deployment, ReplicaSet and
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// StatefulSet. While the spec.replicas, status.replicas fields are in the same
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// exact field path locations as they are in autoscaling.Scale, the selector
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// fields are in different locations, and are a different type.
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func ExtractInto(object runtime.Object, objectType typed.ParseableType, fieldManager string, applyConfiguration interface{}, subresource string) error {
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typedObj, err := toTyped(object, objectType)
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if err != nil {
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return fmt.Errorf("error converting obj to typed: %w", err)
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}
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accessor, err := meta.Accessor(object)
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if err != nil {
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return fmt.Errorf("error accessing metadata: %w", err)
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}
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fieldsEntry, ok := findManagedFields(accessor, fieldManager, subresource)
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if !ok {
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return nil
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}
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fieldset := &fieldpath.Set{}
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err = fieldset.FromJSON(bytes.NewReader(fieldsEntry.FieldsV1.Raw))
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if err != nil {
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return fmt.Errorf("error marshalling FieldsV1 to JSON: %w", err)
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}
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u := typedObj.ExtractItems(fieldset.Leaves()).AsValue().Unstructured()
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m, ok := u.(map[string]interface{})
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if !ok {
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return fmt.Errorf("unable to convert managed fields for %s to unstructured, expected map, got %T", fieldManager, u)
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}
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// set the type meta manually if it doesn't exist to avoid missing kind errors
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// when decoding from unstructured JSON
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if _, ok := m["kind"]; !ok && object.GetObjectKind().GroupVersionKind().Kind != "" {
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m["kind"] = object.GetObjectKind().GroupVersionKind().Kind
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m["apiVersion"] = object.GetObjectKind().GroupVersionKind().GroupVersion().String()
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}
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if err := runtime.DefaultUnstructuredConverter.FromUnstructured(m, applyConfiguration); err != nil {
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return fmt.Errorf("error extracting into obj from unstructured: %w", err)
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}
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return nil
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}
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func findManagedFields(accessor metav1.Object, fieldManager string, subresource string) (metav1.ManagedFieldsEntry, bool) {
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objManagedFields := accessor.GetManagedFields()
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for _, mf := range objManagedFields {
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if mf.Manager == fieldManager && mf.Operation == metav1.ManagedFieldsOperationApply && mf.Subresource == subresource {
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return mf, true
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}
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}
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return metav1.ManagedFieldsEntry{}, false
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}
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func toTyped(obj runtime.Object, objectType typed.ParseableType) (*typed.TypedValue, error) {
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switch o := obj.(type) {
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case *unstructured.Unstructured:
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return objectType.FromUnstructured(o.Object)
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default:
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return objectType.FromStructured(o)
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}
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}
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