84 lines
1.8 KiB
Go
84 lines
1.8 KiB
Go
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// Licensed to Elasticsearch B.V. under one or more contributor
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// license agreements. See the NOTICE file distributed with
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// this work for additional information regarding copyright
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// ownership. Elasticsearch B.V. licenses this file to you under
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// the Apache License, Version 2.0 (the "License"); you may
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// 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,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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package common
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import "time"
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// A Backoff waits on errors with exponential backoff (limited by maximum
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// backoff). Resetting Backoff will reset the next sleep timer to the initial
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// backoff duration.
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type Backoff struct {
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duration time.Duration
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done <-chan struct{}
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init time.Duration
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max time.Duration
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last time.Time
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}
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func NewBackoff(done <-chan struct{}, init, max time.Duration) *Backoff {
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return &Backoff{
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duration: init,
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done: done,
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init: init,
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max: max,
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}
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}
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func (b *Backoff) Reset() {
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b.duration = b.init
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}
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func (b *Backoff) Wait() bool {
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backoff := b.duration
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b.duration *= 2
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if b.duration > b.max {
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b.duration = b.max
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}
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select {
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case <-b.done:
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return false
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case <-time.After(backoff):
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b.last = time.Now()
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return true
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}
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}
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func (b *Backoff) WaitOnError(err error) bool {
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if err == nil {
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b.Reset()
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return true
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}
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return b.Wait()
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}
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func (b *Backoff) TryWaitOnError(failTS time.Time, err error) bool {
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if err == nil {
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b.Reset()
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return true
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}
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if failTS.Before(b.last) {
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return true
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}
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return b.Wait()
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}
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