mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-27 00:30:18 +00:00
e3bf375035
update kubernetes to latest v1.25.0 release. Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
106 lines
3.5 KiB
Go
106 lines
3.5 KiB
Go
/*
|
|
Copyright 2016 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 retry
|
|
|
|
import (
|
|
"time"
|
|
|
|
"k8s.io/apimachinery/pkg/api/errors"
|
|
"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,
|
|
}
|
|
|
|
// OnError 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 OnError(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
|
|
}
|
|
|
|
// RetryOnConflict is used to make an update to a resource when you have to worry about
|
|
// conflicts caused by other code making unrelated updates to the resource at the same
|
|
// time. fn should fetch the resource to be modified, make appropriate changes to it, try
|
|
// to update it, and return (unmodified) the error from the update function. On a
|
|
// successful update, RetryOnConflict will return nil. If the update function returns a
|
|
// "Conflict" error, RetryOnConflict will wait some amount of time as described by
|
|
// backoff, and then try again. On a non-"Conflict" error, or if it retries too many times
|
|
// and gives up, RetryOnConflict will return an error to the caller.
|
|
//
|
|
// err := retry.RetryOnConflict(retry.DefaultRetry, func() error {
|
|
// // Fetch the resource here; you need to refetch it on every try, since
|
|
// // if you got a conflict on the last update attempt then you need to get
|
|
// // the current version before making your own changes.
|
|
// pod, err := c.Pods("mynamespace").Get(name, metav1.GetOptions{})
|
|
// if err != nil {
|
|
// return err
|
|
// }
|
|
//
|
|
// // Make whatever updates to the resource are needed
|
|
// pod.Status.Phase = v1.PodFailed
|
|
//
|
|
// // Try to update
|
|
// _, err = c.Pods("mynamespace").UpdateStatus(pod)
|
|
// // You have to return err itself here (not wrapped inside another error)
|
|
// // so that RetryOnConflict can identify it correctly.
|
|
// return err
|
|
// })
|
|
// if err != nil {
|
|
// // May be conflict if max retries were hit, or may be something unrelated
|
|
// // like permissions or a network error
|
|
// return err
|
|
// }
|
|
// ...
|
|
//
|
|
// TODO: Make Backoff an interface?
|
|
func RetryOnConflict(backoff wait.Backoff, fn func() error) error {
|
|
return OnError(backoff, errors.IsConflict, fn)
|
|
}
|