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Scott Baker2d897982019-09-24 11:50:08 -07001// 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
15package clientv3
16
17import (
18 "math/rand"
19 "reflect"
20 "runtime"
21 "strings"
22 "time"
23)
24
25// jitterUp adds random jitter to the duration.
26//
27// This adds or subtracts time from the duration within a given jitter fraction.
28// For example for 10s and jitter 0.1, it will return a time within [9s, 11s])
29//
30// Reference: https://godoc.org/github.com/grpc-ecosystem/go-grpc-middleware/util/backoffutils
31func jitterUp(duration time.Duration, jitter float64) time.Duration {
32 multiplier := jitter * (rand.Float64()*2 - 1)
33 return time.Duration(float64(duration) * (1 + multiplier))
34}
35
36// Check if the provided function is being called in the op options.
37func isOpFuncCalled(op string, opts []OpOption) bool {
38 for _, opt := range opts {
39 v := reflect.ValueOf(opt)
40 if v.Kind() == reflect.Func {
41 if opFunc := runtime.FuncForPC(v.Pointer()); opFunc != nil {
42 if strings.Contains(opFunc.Name(), op) {
43 return true
44 }
45 }
46 }
47 }
48 return false
49}