mirror of https://github.com/k3s-io/k3s
68 lines
1.7 KiB
Go
68 lines
1.7 KiB
Go
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/*
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Copyright 2017 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package ipam
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import (
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"time"
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)
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// Timeout manages the resync loop timing for a given node sync operation. The
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// timeout changes depending on whether or not there was an error reported for
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// the operation. Consecutive errors will result in exponential backoff to a
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// maxBackoff timeout.
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type Timeout struct {
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// Resync is the default timeout duration when there are no errors.
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Resync time.Duration
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// MaxBackoff is the maximum timeout when in a error backoff state.
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MaxBackoff time.Duration
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// InitialRetry is the initial retry interval when an error is reported.
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InitialRetry time.Duration
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// errs is the count of consecutive errors that have occurred.
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errs int
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// current is the current backoff timeout.
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current time.Duration
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}
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// Update the timeout with the current error state.
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func (b *Timeout) Update(ok bool) {
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if ok {
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b.errs = 0
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b.current = b.Resync
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return
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}
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b.errs++
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if b.errs == 1 {
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b.current = b.InitialRetry
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return
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}
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b.current *= 2
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if b.current >= b.MaxBackoff {
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b.current = b.MaxBackoff
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}
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}
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// Next returns the next operation timeout given the disposition of err.
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func (b *Timeout) Next() time.Duration {
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if b.errs == 0 {
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return b.Resync
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}
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return b.current
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}
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