Defer trick to around wrap function code

defer.go

package main

import (
	"fmt"
)

type Tnx struct {
}

func main() {
	tnx := &Tnx{}

	defer manageTnx(tnx)()

	fmt.Printf("Working with the DB Transaction %p\n", tnx)
}

func manageTnx(tnx *Tnx) func() {
	fmt.Printf("Open DB Transaction %p \n", tnx)

	return func() {
		fmt.Printf("Close DB Transaction %p \n", tnx)
	}

}

Output:

Open DB Transaction 0x58fd18 
Working with the DB Transaction 0x58fd18
Close DB Transaction 0x58fd18