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