mirror of
https://github.com/gravitational/teleport.git
synced 2026-11-02 23:31:08 +08:00
142 lines
3.2 KiB
Go
142 lines
3.2 KiB
Go
/*
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Copyright 2025 Gravitational, Inc.
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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 structfill
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import (
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"reflect"
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"time"
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"github.com/gravitational/trace"
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)
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// Fill sets non-default values for all fields in the value pointed to by ptr.
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// It returns an error if it encounters a field it cannot set.
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// NOTE: Use only it tests.
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func Fill(ptr any) error {
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if ptr == nil {
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return trace.BadParameter("missing pointer")
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}
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root := reflect.ValueOf(ptr)
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if root.Kind() != reflect.Ptr || root.IsNil() {
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return trace.BadParameter("must pass a non-nil pointer")
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}
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return trace.Wrap(fill(root.Elem()))
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}
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func fill(v reflect.Value) error {
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if !v.CanSet() {
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return trace.BadParameter("cannot set value of type %v", v.Type())
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}
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switch v.Kind() {
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case reflect.Bool:
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v.SetBool(true)
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return nil
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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if v.Type().PkgPath() == "time" && v.Type().Name() == "Duration" {
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v.SetInt(int64(time.Second))
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} else {
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v.SetInt(1)
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}
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return nil
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
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v.SetUint(1)
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return nil
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case reflect.Float32, reflect.Float64:
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v.SetFloat(1.1)
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return nil
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case reflect.Complex64, reflect.Complex128:
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v.SetComplex(complex(1, 1))
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return nil
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case reflect.String:
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v.SetString("nonzero")
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return nil
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case reflect.Slice:
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s := reflect.MakeSlice(v.Type(), 1, 1)
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if err := fill(s.Index(0)); err != nil {
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return trace.Wrap(err)
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}
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v.Set(s)
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return nil
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case reflect.Array:
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for i := 0; i < v.Len(); i++ {
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if err := fill(v.Index(i)); err != nil {
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return trace.Wrap(err)
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}
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}
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return nil
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case reflect.Map:
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kt, vt := v.Type().Key(), v.Type().Elem()
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m := reflect.MakeMapWithSize(v.Type(), 1)
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k := reflect.New(kt).Elem()
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if err := fill(k); err != nil {
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return trace.Wrap(err)
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}
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val := reflect.New(vt).Elem()
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if err := fill(val); err != nil {
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return trace.Wrap(err)
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}
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m.SetMapIndex(k, val)
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v.Set(m)
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return nil
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case reflect.Ptr:
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elem := reflect.New(v.Type().Elem())
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if err := fill(elem.Elem()); err != nil {
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return trace.Wrap(err)
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}
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v.Set(elem)
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return nil
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case reflect.Struct:
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if v.Type().PkgPath() == "time" && v.Type().Name() == "Time" {
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v.Set(reflect.ValueOf(time.Now()))
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return nil
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}
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t := v.Type()
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for i := 0; i < v.NumField(); i++ {
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sf := t.Field(i)
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f := v.Field(i)
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if !f.CanSet() {
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return trace.BadParameter(
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"cannot set field %q of type %v (unexported or from another package)",
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sf.Name, sf.Type,
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)
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}
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if err := fill(f); err != nil {
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return trace.Wrap(err)
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}
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}
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return nil
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default:
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// For unsupported kinds (func, chan, unsafe pointers, interfaces)
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return trace.BadParameter("unsupported kind %v", v.Kind())
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}
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}
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