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// Copyright (c) The go-grpc-middleware Authors.
// Licensed under the Apache License 2.0.
// Package backoffutils 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
}
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