How to read struct tags in Go.

readtags.go

package main

import (
	"errors"
	"fmt"
	"reflect"
)

var NotAStruct = errors.New("Object is Not a Struct")

type Example struct {
	One string `test:"Yep"`
	Two string `test:"Nope"`
	Three string
}

func toReflection(obj interface{}) (reflect.Type, error) {
	typ := reflect.TypeOf(obj)
	if typ.Kind() != reflect.Struct {
		return nil, NotAStruct
	}

	return typ, nil;
}


func main() {
	e := Example{}
	a := 1
	
	if _, err := toReflection(a); err != nil {
		fmt.Println(err)
	}

	typ, _ := toReflection(e)

	for i := 0; i < typ.NumField(); i++ {
		tag := typ.Field(i).Tag
		fmt.Println(tag.Get("test"))
		fmt.Println(tag.Get("doesnotexist"))
	}
}