| Stephane Barbarie | 260a563 | 2019-02-26 16:12:49 -0500 | [diff] [blame] | 1 | // Copyright 2018 The etcd Authors |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
| 15 | package clientv3 |
| 16 | |
| 17 | import ( |
| 18 | "math/rand" |
| 19 | "time" |
| 20 | ) |
| 21 | |
| 22 | // jitterUp adds random jitter to the duration. |
| 23 | // |
| 24 | // This adds or subtracts time from the duration within a given jitter fraction. |
| 25 | // For example for 10s and jitter 0.1, it will return a time within [9s, 11s]) |
| 26 | // |
| 27 | // Reference: https://godoc.org/github.com/grpc-ecosystem/go-grpc-middleware/util/backoffutils |
| 28 | func jitterUp(duration time.Duration, jitter float64) time.Duration { |
| 29 | multiplier := jitter * (rand.Float64()*2 - 1) |
| 30 | return time.Duration(float64(duration) * (1 + multiplier)) |
| 31 | } |