98 lines
2.1 KiB
Go
98 lines
2.1 KiB
Go
|
// Package generator implements the custom initialization of all the fields of an empty interface.
|
||
|
|
package generator
|
||
|
|
|
||
|
|
import (
|
||
|
|
"reflect"
|
||
|
|
|
||
|
|
"github.com/containous/traefik/pkg/config/parser"
|
||
|
|
)
|
||
|
|
|
||
|
|
type initializer interface {
|
||
|
|
SetDefaults()
|
||
|
|
}
|
||
|
|
|
||
|
|
// Generate recursively initializes an empty structure, calling SetDefaults on each field, when it applies.
|
||
|
|
func Generate(element interface{}) {
|
||
|
|
if element == nil {
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
generate(element)
|
||
|
|
}
|
||
|
|
|
||
|
|
func generate(element interface{}) {
|
||
|
|
field := reflect.ValueOf(element)
|
||
|
|
|
||
|
|
fill(field)
|
||
|
|
}
|
||
|
|
|
||
|
|
func fill(field reflect.Value) {
|
||
|
|
switch field.Kind() {
|
||
|
|
case reflect.Ptr:
|
||
|
|
setPtr(field)
|
||
|
|
case reflect.Struct:
|
||
|
|
setStruct(field)
|
||
|
|
case reflect.Map:
|
||
|
|
setMap(field)
|
||
|
|
case reflect.Slice:
|
||
|
|
if field.Type().Elem().Kind() == reflect.Struct ||
|
||
|
|
field.Type().Elem().Kind() == reflect.Ptr && field.Type().Elem().Elem().Kind() == reflect.Struct {
|
||
|
|
slice := reflect.MakeSlice(field.Type(), 1, 1)
|
||
|
|
field.Set(slice)
|
||
|
|
|
||
|
|
// use Ptr to allow "SetDefaults"
|
||
|
|
value := reflect.New(reflect.PtrTo(field.Type().Elem()))
|
||
|
|
setPtr(value)
|
||
|
|
|
||
|
|
elem := value.Elem().Elem()
|
||
|
|
field.Index(0).Set(elem)
|
||
|
|
} else if field.Len() == 0 {
|
||
|
|
slice := reflect.MakeSlice(field.Type(), 0, 0)
|
||
|
|
field.Set(slice)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func setPtr(field reflect.Value) {
|
||
|
|
if field.IsNil() {
|
||
|
|
field.Set(reflect.New(field.Type().Elem()))
|
||
|
|
}
|
||
|
|
|
||
|
|
if field.Type().Implements(reflect.TypeOf((*initializer)(nil)).Elem()) {
|
||
|
|
method := field.MethodByName("SetDefaults")
|
||
|
|
if method.IsValid() {
|
||
|
|
method.Call([]reflect.Value{})
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
fill(field.Elem())
|
||
|
|
}
|
||
|
|
|
||
|
|
func setStruct(field reflect.Value) {
|
||
|
|
for i := 0; i < field.NumField(); i++ {
|
||
|
|
fd := field.Field(i)
|
||
|
|
structField := field.Type().Field(i)
|
||
|
|
|
||
|
|
if structField.Tag.Get(parser.TagLabel) == "-" {
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
|
||
|
|
if parser.IsExported(structField) {
|
||
|
|
fill(fd)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func setMap(field reflect.Value) {
|
||
|
|
if field.IsNil() {
|
||
|
|
field.Set(reflect.MakeMap(field.Type()))
|
||
|
|
}
|
||
|
|
|
||
|
|
ptrValue := reflect.New(reflect.PtrTo(field.Type().Elem()))
|
||
|
|
fill(ptrValue)
|
||
|
|
|
||
|
|
value := ptrValue.Elem().Elem()
|
||
|
|
key := reflect.ValueOf(parser.MapNamePlaceholder)
|
||
|
|
field.SetMapIndex(key, value)
|
||
|
|
}
|