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retry.go
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retry.go
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/*
Copyright 2021 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 util
import (
"time"
"k8s.io/apimachinery/pkg/util/wait"
)
// DefaultRetry is the recommended retry for a conflict where multiple clients
// are making changes to the same resource.
var DefaultRetry = wait.Backoff{
Steps: 5,
Duration: 10 * time.Millisecond,
Factor: 1.0,
Jitter: 0.1,
}
// DefaultBackoff is the recommended backoff for a conflict where a client
// may be attempting to make an unrelated modification to a resource under
// active management by one or more controllers.
var DefaultBackoff = wait.Backoff{
Steps: 4,
Duration: 10 * time.Millisecond,
Factor: 5.0,
Jitter: 0.1,
}
// RetryOnError allows the caller to retry fn in case the error returned by fn is retriable
// according to the provided function. backoff defines the maximum retries and the wait
// interval between two retries.
func RetryOnError(backoff wait.Backoff, retriable func(error) bool, fn func() error) error {
var lastErr error
err := wait.ExponentialBackoff(backoff, func() (bool, error) {
err := fn()
switch {
case err == nil:
return true, nil
case retriable(err):
lastErr = err
return false, nil
default:
return false, err
}
})
if err == wait.ErrWaitTimeout {
err = lastErr
}
return err
}