mirror of https://github.com/kubernetes/kops.git
58 lines
1.5 KiB
Go
58 lines
1.5 KiB
Go
/*
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Copyright 2019 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 backoff
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import (
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"sync"
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"time"
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"k8s.io/klog/v2"
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)
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// globalBackoffMutex guards globalBackoff
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var globalBackoffMutex sync.Mutex
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// globalBackoff is the current backoff value
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var globalBackoff = 1 * time.Second
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// maxGlobalBackoff value is the maximum wait time
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const maxGlobalBackoff = 5 * time.Minute
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// DoGlobalBackoff performs a sleep with a pretty slow backoff.
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// The primary use is to rate-limit repeated downloads, to prevent runaway bandwidth bills
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func DoGlobalBackoff(err error) {
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pause := computeBackoff()
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klog.Warningf("inserting rate-limiting pause of %v after error: %v", pause, err)
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time.Sleep(pause)
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}
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// computeBackoff computes the next backoff value, by doubling the backoff value, capping it at maxGlobalBackoff
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func computeBackoff() time.Duration {
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globalBackoffMutex.Lock()
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defer globalBackoffMutex.Unlock()
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v := globalBackoff
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v = v + v
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if v > maxGlobalBackoff {
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v = maxGlobalBackoff
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}
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globalBackoff = v
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return v
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}
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