mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-24 07:10:20 +00:00
80 lines
2.2 KiB
Go
80 lines
2.2 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,
|
|
}
|
|
|
|
// RetryConflict executes the provided function repeatedly, retrying if the server returns a conflicting
|
|
// write. Callers should preserve previous executions if they wish to retry changes. It performs an
|
|
// exponential backoff.
|
|
//
|
|
// var pod *api.Pod
|
|
// err := RetryOnConflict(DefaultBackoff, func() (err error) {
|
|
// pod, err = c.Pods("mynamespace").UpdateStatus(podStatus)
|
|
// return
|
|
// })
|
|
// if err != nil {
|
|
// // may be conflict if max retries were hit
|
|
// return err
|
|
// }
|
|
// ...
|
|
//
|
|
// TODO: Make Backoff an interface?
|
|
func RetryOnConflict(backoff wait.Backoff, fn func() error) error {
|
|
var lastConflictErr error
|
|
err := wait.ExponentialBackoff(backoff, func() (bool, error) {
|
|
err := fn()
|
|
switch {
|
|
case err == nil:
|
|
return true, nil
|
|
case errors.IsConflict(err):
|
|
lastConflictErr = err
|
|
return false, nil
|
|
default:
|
|
return false, err
|
|
}
|
|
})
|
|
if err == wait.ErrWaitTimeout {
|
|
err = lastConflictErr
|
|
}
|
|
return err
|
|
}
|