mirror of https://github.com/kubernetes/kops.git
304 lines
7.2 KiB
Go
304 lines
7.2 KiB
Go
/*
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Copyright 2020 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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"strconv"
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"strings"
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"time"
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"k8s.io/apimachinery/pkg/api/resource"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/util/intstr"
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)
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func SetString(target interface{}, targetPath string, newValue string) error {
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targetValue := reflect.ValueOf(target)
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targetFieldPath, err := ParseFieldPath(targetPath)
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if err != nil {
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return fmt.Errorf("cannot parse field path %q: %w", targetPath, err)
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}
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fieldSet := false
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visitor := func(path *FieldPath, field *reflect.StructField, v reflect.Value) error {
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if !targetFieldPath.HasPrefixMatch(path) {
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return nil
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}
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if targetFieldPath.Matches(path) {
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if !v.CanSet() {
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return fmt.Errorf("cannot set field %q (marked immutable)", path)
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}
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if err := setType(v, newValue); err != nil {
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return fmt.Errorf("cannot set field %q: %v", path, err)
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}
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fieldSet = true
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return nil
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}
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// Partial match, check for nil struct and auto-populate
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if v.Kind() == reflect.Ptr && v.IsNil() {
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if !v.CanSet() {
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return fmt.Errorf("cannot set field %q (marked immutable)", path)
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}
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t := v.Type().String()
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var newV reflect.Value
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switch v.Type().Elem().Kind() {
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case reflect.Struct:
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newV = reflect.New(v.Type().Elem())
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default:
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return fmt.Errorf("unhandled type %v %q", v.Type().Elem().Kind(), t)
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}
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v.Set(newV)
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return nil
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}
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return nil
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}
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err = ReflectRecursive(targetValue, visitor, &ReflectOptions{JSONNames: true})
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if err != nil {
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return err
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}
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if !fieldSet {
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return fmt.Errorf("field %s not found in %s", targetPath, BuildTypeName(reflect.TypeOf(target)))
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}
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return nil
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}
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func setType(v reflect.Value, newValue string) error {
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if !v.CanSet() {
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return fmt.Errorf("cannot set value")
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}
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if v.Type().Kind() == reflect.Slice {
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// To support multiple values, we split on commas.
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// We have no way to escape a comma currently; but in general we prefer having a slice in the schema,
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// rather than having values that need to be parsed, so we may not need it.
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tokens := strings.Split(newValue, ",")
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valueArray := reflect.MakeSlice(v.Type(), 0, v.Len()+len(tokens))
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valueArray = reflect.AppendSlice(valueArray, v)
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for _, s := range tokens {
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valueItem := reflect.New(v.Type().Elem())
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if err := setType(valueItem.Elem(), s); err != nil {
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return err
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}
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valueArray = reflect.Append(valueArray, valueItem.Elem())
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}
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reflect.New(v.Type().Elem())
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v.Set(valueArray)
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return nil
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}
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if newValue == "" && (v.Type().Kind() == reflect.Map || v.Type().Kind() == reflect.Struct) {
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return nil
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}
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if v.Type().Kind() == reflect.Ptr {
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val := reflect.New(v.Type().Elem())
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if err := setType(val.Elem(), newValue); err != nil {
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return err
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}
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v.Set(val)
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return nil
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}
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t := v.Type().String()
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if v.Type().Kind() == reflect.Map {
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if v.IsNil() {
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v.Set(reflect.MakeMap(v.Type()))
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}
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switch t {
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case "map[string]string":
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name, value, _ := strings.Cut(newValue, "=")
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v.SetMapIndex(reflect.ValueOf(name), reflect.ValueOf(value))
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case "map[string]intstr.IntOrString":
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name, value, _ := strings.Cut(newValue, "=")
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v.SetMapIndex(reflect.ValueOf(name), reflect.ValueOf(intstr.Parse(value)))
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default:
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return fmt.Errorf("unhandled type %q", t)
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}
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return nil
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}
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var newV reflect.Value
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switch t {
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case "string":
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newV = reflect.ValueOf(newValue)
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case "bool":
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b, err := strconv.ParseBool(newValue)
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if err != nil {
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return fmt.Errorf("cannot interpret %q value as bool", newValue)
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}
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newV = reflect.ValueOf(b)
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case "int64", "int32", "int16", "int":
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v, err := strconv.Atoi(newValue)
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if err != nil {
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return fmt.Errorf("cannot interpret %q value as integer", newValue)
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}
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switch t {
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case "int":
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newV = reflect.ValueOf(v)
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case "int16":
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v16 := int16(v)
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newV = reflect.ValueOf(v16)
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case "int32":
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v32 := int32(v)
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newV = reflect.ValueOf(v32)
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case "int64":
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v64 := int64(v)
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newV = reflect.ValueOf(v64)
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default:
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panic("missing case in int switch")
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}
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case "uint64", "uint32", "uint16", "uint":
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v, err := strconv.Atoi(newValue)
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if err != nil {
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return fmt.Errorf("cannot interpret %q value as unsigned integer", newValue)
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}
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switch t {
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case "uint":
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newV = reflect.ValueOf(v)
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case "uint16":
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v16 := uint16(v)
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newV = reflect.ValueOf(v16)
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case "uint32":
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v32 := uint32(v)
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newV = reflect.ValueOf(v32)
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case "uint64":
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v64 := uint64(v)
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newV = reflect.ValueOf(v64)
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default:
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panic("missing case in uint switch")
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}
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case "intstr.IntOrString":
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newV = reflect.ValueOf(intstr.Parse(newValue))
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case "kops.EnvVar":
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newV = reflect.New(v.Type()).Elem()
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envVarType := newV.Type()
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fdName, found := envVarType.FieldByName("Name")
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if !found {
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return fmt.Errorf("field Name not found in %T", newV.Interface())
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}
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fdValue, found := envVarType.FieldByName("Value")
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if !found {
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return fmt.Errorf("field Value not found in %T", newV.Interface())
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}
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name, value, hasValue := strings.Cut(newValue, "=")
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newV.FieldByIndex(fdName.Index).SetString(name)
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if hasValue {
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newV.FieldByIndex(fdValue.Index).SetString(value)
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}
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case "v1.Duration":
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duration, err := time.ParseDuration(newValue)
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if err != nil {
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return fmt.Errorf("cannot interpret %q value as v1.Duration", newValue)
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}
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newV = reflect.ValueOf(metav1.Duration{Duration: duration})
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case "resource.Quantity":
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quantity, err := resource.ParseQuantity(newValue)
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if err != nil {
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return fmt.Errorf("cannot interpret %q value as resource.Quantity", newValue)
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}
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newV = reflect.ValueOf(quantity)
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default:
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// This handles enums and other simple conversions
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newV = reflect.ValueOf(newValue)
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if newV.Type().ConvertibleTo(v.Type()) {
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newV = newV.Convert(v.Type())
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} else {
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return fmt.Errorf("unhandled type %q", t)
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}
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}
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v.Set(newV)
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return nil
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}
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func Unset(target interface{}, targetPath string) error {
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targetValue := reflect.ValueOf(target)
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targetFieldPath, err := ParseFieldPath(targetPath)
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if err != nil {
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return fmt.Errorf("cannot parse field path %q: %w", targetPath, err)
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}
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fieldUnset := false
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visitor := func(path *FieldPath, field *reflect.StructField, v reflect.Value) error {
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if !targetFieldPath.HasPrefixMatch(path) {
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return nil
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}
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if targetFieldPath.Matches(path) {
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if !v.CanSet() {
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return fmt.Errorf("cannot unset field %q (marked immutable)", path)
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}
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v.Set(reflect.Zero(v.Type()))
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fieldUnset = true
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return nil
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}
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return nil
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}
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err = ReflectRecursive(targetValue, visitor, &ReflectOptions{JSONNames: true})
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if err != nil {
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return err
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}
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if !fieldUnset {
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return fmt.Errorf("field %s not found in %s", targetPath, BuildTypeName(reflect.TypeOf(target)))
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}
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return nil
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}
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