Function retrier using closure

retryclosure.go

/*
Retry function using closure
*/
package main

import (
	"errors"
	"fmt"
	"time"
)

type Person struct {
	name    string
	surname string
}

func fetchPerson(n string) (Person, error) {
	time.Sleep(1 * time.Second)
	if n == "Pedro" {
		return Person{"Pedro", "Bertao"}, nil
	}
	return Person{}, errors.New("Person not found")
}

func retry(f func() error, numRetries int) (e error) {
	for i := 0; i < numRetries; i++ {
		fmt.Printf("Trying %d\n", i+1)
		if e = f(); e != nil {
			continue
		} else {
			return
		}
	}
	return errors.New("Max retries attemped")
}

func main() {
	// Case 1 - Person found
	var p Person
	err := retry(func() error {
		psr, err := fetchPerson("Pedro")
		p = psr
		return err
	}, 5)
	fmt.Printf("Person found: %+v with err: %v\n", p, err)
	// Person found: {name:Pedro surname:Bertao} with err: <nil>

	// Case 2 - Person not found
	var p2 Person
	err = retry(func() error {
		psr, err := fetchPerson("Roberto")
		p2 = psr
		return err
	}, 5)
	if err != nil {
		fmt.Printf("Person not found: %+v with err: %v\n", p2, err)
		// Person not found: {name: surname:} with err: Max retris attemped
	}
}