36 lines
990 B
Go
36 lines
990 B
Go
/*
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* Copyright 2020 The Dragonfly Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package mathutils
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import (
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"math"
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"math/rand"
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"time"
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)
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func init() {
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rand.Seed(time.Now().UnixNano())
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}
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func RandBackoff(initBackoff float64, maxBackoff float64, base float64, exp int) time.Duration {
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v1 := math.Pow(base, float64(exp))
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v2 := math.Max(initBackoff, rand.Float64()*math.Min(v1*initBackoff, maxBackoff))
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return time.Duration(v2 * float64(time.Second))
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}
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