| // 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)) |
| } |