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- // Copyright 2018 The etcd Authors
- //
- // Licensed under the Apache License, Version 2.0 (the "License");
- // you may not use this file except in compliance with the License.
- // You may obtain a copy of the License at
- //
- // http://www.apache.org/licenses/LICENSE-2.0
- //
- // Unless required by applicable law or agreed to in writing, software
- // distributed under the License is distributed on an "AS IS" BASIS,
- // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- // See the License for the specific language governing permissions and
- // limitations under the License.
- package clientv3
- 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])
- //
- // Reference: https://godoc.org/github.com/grpc-ecosystem/go-grpc-middleware/util/backoffutils
- func jitterUp(duration time.Duration, jitter float64) time.Duration {
- multiplier := jitter * (rand.Float64()*2 - 1)
- return time.Duration(float64(duration) * (1 + multiplier))
- }
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