golang error message stacking

error_stack.go

package main

import (
	"errors"
	"fmt"
)

func main() {
	flow()
	fmt.Println("continued")
}

// check will stack the error messages
//	init is the error prefix
//	err is the error to be concatinated
//	cont will determine which check calls triggers the panic
//	result will be used for the next check concatinations
func check(init, err error, cont bool) (result error) {
	if init == nil {
		init = errors.New("")
	}
	result = fmt.Errorf("%s\n%s", init, err)
	if !cont && err != nil {
		panic(result)
	}
	return
}

func flow() {
	defer func() {
		if err := recover(); err != nil {
			fmt.Println("err: ", err)
		}
	}()
	err := errors.New("ok")
	err = check(nil, err, true)

	err1 := errors.New("ok 2")
	err = check(err, err1, false)

	err2 := errors.New("ok 3")
	err = check(err, err2, true)

	fmt.Println("Hello, playground")
}