mirror of https://github.com/k3s-io/k3s
93 lines
3.0 KiB
Go
93 lines
3.0 KiB
Go
/*
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Copyright 2019 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 objectmeta
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import (
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"fmt"
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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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"k8s.io/apimachinery/pkg/runtime/serializer/json"
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)
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var encodingjson = json.CaseSensitiveJSONIterator()
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// GetObjectMeta does conversion of JSON to ObjectMeta. It first tries json.Unmarshal into a metav1.ObjectMeta
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// type. If that does not work and dropMalformedFields is true, it does field-by-field best-effort conversion
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// throwing away fields which lead to errors.
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func GetObjectMeta(obj map[string]interface{}, dropMalformedFields bool) (*metav1.ObjectMeta, bool, error) {
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metadata, found := obj["metadata"]
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if !found {
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return nil, false, nil
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}
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// round-trip through JSON first, hoping that unmarshalling just works
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objectMeta := &metav1.ObjectMeta{}
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metadataBytes, err := encodingjson.Marshal(metadata)
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if err != nil {
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return nil, false, err
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}
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if err = encodingjson.Unmarshal(metadataBytes, objectMeta); err == nil {
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// if successful, return
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return objectMeta, true, nil
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}
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if !dropMalformedFields {
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// if we're not trying to drop malformed fields, return the error
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return nil, true, err
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}
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metadataMap, ok := metadata.(map[string]interface{})
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if !ok {
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return nil, false, fmt.Errorf("invalid metadata: expected object, got %T", metadata)
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}
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// Go field by field accumulating into the metadata object.
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// This takes advantage of the fact that you can repeatedly unmarshal individual fields into a single struct,
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// each iteration preserving the old key-values.
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accumulatedObjectMeta := &metav1.ObjectMeta{}
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testObjectMeta := &metav1.ObjectMeta{}
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for k, v := range metadataMap {
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// serialize a single field
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if singleFieldBytes, err := encodingjson.Marshal(map[string]interface{}{k: v}); err == nil {
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// do a test unmarshal
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if encodingjson.Unmarshal(singleFieldBytes, testObjectMeta) == nil {
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// if that succeeds, unmarshal for real
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encodingjson.Unmarshal(singleFieldBytes, accumulatedObjectMeta)
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}
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}
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}
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return accumulatedObjectMeta, true, nil
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}
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// SetObjectMeta writes back ObjectMeta into a JSON data structure.
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func SetObjectMeta(obj map[string]interface{}, objectMeta *metav1.ObjectMeta) error {
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if objectMeta == nil {
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unstructured.RemoveNestedField(obj, "metadata")
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return nil
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}
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metadata, err := runtime.DefaultUnstructuredConverter.ToUnstructured(objectMeta)
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if err != nil {
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return err
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}
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obj["metadata"] = metadata
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return nil
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}
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