mirror of https://github.com/k3s-io/k3s
50 lines
1.5 KiB
Go
50 lines
1.5 KiB
Go
// Copyright 2018 The etcd 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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package clientv3
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import (
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"math/rand"
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"reflect"
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"runtime"
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"strings"
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"time"
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)
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// jitterUp adds random jitter to the duration.
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//
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// This adds or subtracts time from the duration within a given jitter fraction.
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// For example for 10s and jitter 0.1, it will return a time within [9s, 11s])
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//
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// Reference: https://godoc.org/github.com/grpc-ecosystem/go-grpc-middleware/util/backoffutils
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func jitterUp(duration time.Duration, jitter float64) time.Duration {
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multiplier := jitter * (rand.Float64()*2 - 1)
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return time.Duration(float64(duration) * (1 + multiplier))
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}
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// Check if the provided function is being called in the op options.
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func isOpFuncCalled(op string, opts []OpOption) bool {
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for _, opt := range opts {
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v := reflect.ValueOf(opt)
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if v.Kind() == reflect.Func {
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if opFunc := runtime.FuncForPC(v.Pointer()); opFunc != nil {
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if strings.Contains(opFunc.Name(), op) {
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return true
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}
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}
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}
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}
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return false
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}
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