Cosmos decode tx

main.go

package main

import (
	"fmt"
	"encoding/base64"
	"github.com/cosmos/cosmos-sdk/codec"
	sdk "github.com/cosmos/cosmos-sdk/types"
	authTypes "github.com/cosmos/cosmos-sdk/x/auth/types"
	nameTypes "github.com/cosmos/sdk-application-tutorial/x/nameservice/types"
)

func main() {
	cdc := codec.New()
	sdk.RegisterCodec(cdc)
	authTypes.RegisterCodec(cdc)
	nameTypes.RegisterCodec(cdc)
	codec.RegisterCrypto(cdc)

	decoder := authTypes.DefaultTxDecoder(cdc)

	base64Str := "rgEoKBapCjZS59jqCgpnb29nbGUuY29tEg4KCW5hbWV0b2tlbhIBNRoUr67sqicZ8wXbWkNLD8E6c0TGM/YSBBDAmgwaagom61rphyEC6ICqudQCIugpL8NEvi6Fblxk+ZB+51T+NUDg0WdMQCUSQG0z4HhxINONIjPcQc/GDyVOjU9CRovZaT3GxcekSvN6SBQx94xgwMkq7EqivCxSqYB/TDC0Gp5Z/6z2+Z4Km3k="
	bz, err := base64.StdEncoding.DecodeString(base64Str)
	if err != nil {
		panic(err)
	}

	tx, err := decoder(bz)
	if err != nil {
		panic(err)
	}
	msgs := tx.GetMsgs()
	msg := msgs[0]
	fmt.Printf("Msg Type: %s\n", msg.Type())
	buyNameMsg := msg.(nameTypes.MsgBuyName)
	fmt.Println(buyNameMsg)
}