notyim/notyim

package utils

import (
    "math/rand"
    "time"
)

func init() {
    rand.Seed(time.Now().UnixNano())
}

type stop struct {
    error
}

func Retry(attempts int, sleep time.Duration, f func() error) error {
    if err := f(); err != nil {
        if s, ok := err.(stop); ok {
            // Return the original error for later checking
            return s.error
        }

        if attempts--; attempts > 0 {
            // Add some randomness to prevent creating a Thundering Herd
            jitter := time.Duration(rand.Int63n(int64(sleep)))
            sleep = sleep + jitter/2

            time.Sleep(sleep)
            return Retry(attempts, 2*sleep, f)
        }
        return err
    }

    return nil
}