mirror of https://github.com/kubernetes/kops.git
58 lines
1.5 KiB
Go
58 lines
1.5 KiB
Go
/*
|
|
Copyright 2019 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package backoff
|
|
|
|
import (
|
|
"sync"
|
|
"time"
|
|
|
|
"k8s.io/klog"
|
|
)
|
|
|
|
// globalBackoffMutex guards globalBackoff
|
|
var globalBackoffMutex sync.Mutex
|
|
|
|
// globalBackoff is the current backoff value
|
|
var globalBackoff = 1 * time.Second
|
|
|
|
// maxGlobalBackoff value is the maximum wait time
|
|
const maxGlobalBackoff = 5 * time.Minute
|
|
|
|
// DoGlobalBackoff performs a sleep with a pretty slow backoff.
|
|
// The primary use is to rate-limit repeated downloads, to prevent runaway bandwidth bills
|
|
func DoGlobalBackoff(err error) {
|
|
pause := computeBackoff()
|
|
|
|
klog.Warningf("inserting rate-limiting pause of %v after error: %v", pause, err)
|
|
time.Sleep(pause)
|
|
}
|
|
|
|
// computeBackoff computes the next backoff value, by doubling the backoff value, capping it at maxGlobalBackoff
|
|
func computeBackoff() time.Duration {
|
|
globalBackoffMutex.Lock()
|
|
defer globalBackoffMutex.Unlock()
|
|
|
|
v := globalBackoff
|
|
v = v + v
|
|
if v > maxGlobalBackoff {
|
|
v = maxGlobalBackoff
|
|
}
|
|
globalBackoff = v
|
|
|
|
return v
|
|
}
|