mirror of
https://github.com/rocky-linux/peridot.git
synced 2024-12-22 10:48:30 +00:00
29 lines
742 B
Go
29 lines
742 B
Go
|
// Copyright 2016 Michal Witkowski. All Rights Reserved.
|
||
|
|
// See LICENSE for licensing terms.
|
||
|
|
|
||
|
|
/*
|
||
|
|
Backoff Helper Utilities
|
||
|
|
|
||
|
|
Implements common backoff features.
|
||
|
|
*/
|
||
|
|
package backoffutils
|
||
|
|
|
||
|
|
import (
|
||
|
|
"math/rand"
|
||
|
|
"time"
|
||
|
|
)
|
||
|
|
|
||
|
|
// JitterUp adds random jitter to the duration.
|
||
|
|
//
|
||
|
|
// This adds or subtracts time from the duration within a given jitter fraction.
|
||
|
|
// For example for 10s and jitter 0.1, it will return a time within [9s, 11s])
|
||
|
|
func JitterUp(duration time.Duration, jitter float64) time.Duration {
|
||
|
|
multiplier := jitter * (rand.Float64()*2 - 1)
|
||
|
|
return time.Duration(float64(duration) * (1 + multiplier))
|
||
|
|
}
|
||
|
|
|
||
|
|
// ExponentBase2 computes 2^(a-1) where a >= 1. If a is 0, the result is 0.
|
||
|
|
func ExponentBase2(a uint) uint {
|
||
|
|
return (1 << a) >> 1
|
||
|
|
}
|