Get Struct Fields From Struct

struct-fields.go

package main

import (
	"fmt"
	"reflect"
)

type T struct {
	Id    int
	Name  string
	Email string
	Query func()
	Data  []byte
}

func main() {
	for name, mtype := range StructFields(&T{Query: func() { fmt.Println("foobar") }, Data: []byte{1, 2, 3}}) {
		fmt.Printf("Name: %s, Type %s, Size %d\n", name, mtype, mtype.Size())
	}
}

func StructFields(m interface{}) map[string]reflect.Type {
	typ := reflect.TypeOf(m)
	if typ.Kind() == reflect.Ptr {
		typ = typ.Elem()
	}
	flds := make(map[string]reflect.Type)
	if typ.Kind() != reflect.Struct {
		fmt.Printf("%v type can't have attributes inspected\n", typ.Kind())
		return flds
	}
	for i := 0; i < typ.NumField(); i++ {
		p := typ.Field(i)
		if !p.Anonymous {
			flds[p.Name] = p.Type
		}
	}
	return flds
}