package asynq import ( "fmt" "log" "math" "math/rand" "time" ) func retryTask(rdb *rdb, msg *taskMessage, err error) { if msg.Retried >= msg.Retry { fmt.Println("[DEBUG] Retry exhausted!!!") if err := rdb.kill(msg); err != nil { log.Printf("[SERVER ERROR] could not add task %+v to 'dead' set\n", err) } return } retryAt := time.Now().Add(delaySeconds((msg.Retried))) fmt.Printf("[DEBUG] Retrying the task in %v\n", retryAt.Sub(time.Now())) msg.Retried++ msg.ErrorMsg = err.Error() if err := rdb.zadd(retry, float64(retryAt.Unix()), msg); err != nil { // TODO(hibiken): Not sure how to handle this error log.Printf("[SEVERE ERROR] could not add msg %+v to 'retry' set: %v\n", msg, err) return } } // delaySeconds returns a number seconds to delay before retrying. // Formula taken from https://github.com/mperham/sidekiq. func delaySeconds(count int) time.Duration { r := rand.New(rand.NewSource(time.Now().UnixNano())) s := int(math.Pow(float64(count), 4)) + 15 + (r.Intn(30) * (count + 1)) return time.Duration(s) * time.Second }