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dump.go
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dump.go
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// Copyright 2018-2024 CERN
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// In applying this license, CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
package config
import "reflect"
func dumpStruct(v reflect.Value) map[string]any {
if v.Kind() != reflect.Struct {
panic("called dumpStruct on non struct type")
}
n := v.NumField()
m := make(map[string]any, n)
t := v.Type()
for i := 0; i < n; i++ {
e := v.Field(i)
f := t.Field(i)
if !f.IsExported() {
continue
}
if isFieldSquashed(f) {
if e.Kind() == reflect.Pointer {
e = e.Elem()
}
var mm map[string]any
switch e.Kind() {
case reflect.Struct:
mm = dumpStruct(e)
case reflect.Map:
mm = dumpMap(e)
default:
panic("squash not allowed on non map/struct types")
}
for k, v := range mm {
m[k] = v
}
continue
}
n := fieldName(f)
if n == "-" {
continue
}
m[n] = dumpByType(e)
}
return m
}
func fieldName(f reflect.StructField) string {
fromtag := f.Tag.Get("key")
if fromtag != "" {
return fromtag
}
return f.Name
}
func isFieldSquashed(f reflect.StructField) bool {
tag := f.Tag.Get("key")
return tag != "" && tag[1:] == "squash"
}
func dumpMap(v reflect.Value) map[string]any {
if v.Kind() != reflect.Map {
panic("called dumpMap on non map type")
}
m := make(map[string]any, v.Len())
iter := v.MapRange()
for iter.Next() {
k := iter.Key()
e := iter.Value()
key, ok := k.Interface().(string)
if !ok {
panic("key map must be a string")
}
m[key] = dumpByType(e)
}
return m
}
func dumpList(v reflect.Value) []any {
if v.Kind() != reflect.Array && v.Kind() != reflect.Slice {
panic("called dumpList on non array/slice type")
}
n := v.Len()
l := make([]any, 0, n)
for i := 0; i < n; i++ {
e := v.Index(i)
l = append(l, dumpByType(e))
}
return l
}
func dumpPrimitive(v reflect.Value) any {
if v.Kind() != reflect.Bool && v.Kind() != reflect.Int && v.Kind() != reflect.Int8 &&
v.Kind() != reflect.Int16 && v.Kind() != reflect.Int32 && v.Kind() != reflect.Int64 &&
v.Kind() != reflect.Uint && v.Kind() != reflect.Uint8 && v.Kind() != reflect.Uint16 &&
v.Kind() != reflect.Uint32 && v.Kind() != reflect.Uint64 && v.Kind() != reflect.Float32 &&
v.Kind() != reflect.Float64 && v.Kind() != reflect.String {
panic("called dumpPrimitive on non primitive type: " + v.Kind().String())
}
return v.Interface()
}
func dumpByType(v reflect.Value) any {
switch v.Kind() {
case reflect.Bool, reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64,
reflect.Float32, reflect.Float64, reflect.String:
return dumpPrimitive(v)
case reflect.Array, reflect.Slice:
return dumpList(v)
case reflect.Struct:
return dumpStruct(v)
case reflect.Map:
return dumpMap(v)
case reflect.Interface, reflect.Pointer:
return dumpByType(v.Elem())
}
panic("type not supported: " + v.Kind().String())
}