mirror of https://github.com/kubernetes/kops.git
67 lines
1.7 KiB
Go
67 lines
1.7 KiB
Go
/*
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Copyright 2025 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 reflectutils
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import (
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"fmt"
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"reflect"
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"strings"
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"k8s.io/apimachinery/pkg/util/sets"
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)
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// FindSetFields returns the set of fields that are set in the struct,
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// using the json tags as the field names.
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// It only considers the fields that are listed in the fields argument.
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func FindSetFields[T any](v *T, fields ...string) (sets.Set[string], error) {
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val := reflect.ValueOf(v).Elem()
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valType := val.Type()
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fieldsByJsonName := make(map[string]reflect.StructField)
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for i := 0; i < val.NumField(); i++ {
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fd := valType.Field(i)
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jsonName := fd.Tag.Get("json")
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if jsonName == "" || jsonName == "-" {
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continue
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}
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jsonName = strings.TrimSuffix(jsonName, ",omitempty")
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fieldsByJsonName[jsonName] = fd
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}
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setFields := sets.New[string]()
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for _, field := range fields {
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fd, ok := fieldsByJsonName[field]
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if !ok {
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return nil, fmt.Errorf("field %s is not known", field)
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}
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fieldVal := val.FieldByIndex(fd.Index)
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switch fieldVal.Kind() {
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case reflect.Ptr:
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if !fieldVal.IsNil() {
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setFields.Insert(field)
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}
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default:
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return nil, fmt.Errorf("field %s is not a pointer", fd.Name)
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}
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}
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return setFields, nil
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}
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