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asynq/retry.go

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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
}