forked from github/multus-cni
ac21a96804
gomodule is still in progress to migrate for now, hence multus team decide to keep vendor directory to support build without gomodule.
80 lines
2.2 KiB
Go
80 lines
2.2 KiB
Go
/*
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Copyright 2016 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 retry
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import (
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"time"
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"k8s.io/apimachinery/pkg/api/errors"
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"k8s.io/apimachinery/pkg/util/wait"
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)
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// DefaultRetry is the recommended retry for a conflict where multiple clients
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// are making changes to the same resource.
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var DefaultRetry = wait.Backoff{
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Steps: 5,
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Duration: 10 * time.Millisecond,
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Factor: 1.0,
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Jitter: 0.1,
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}
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// DefaultBackoff is the recommended backoff for a conflict where a client
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// may be attempting to make an unrelated modification to a resource under
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// active management by one or more controllers.
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var DefaultBackoff = wait.Backoff{
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Steps: 4,
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Duration: 10 * time.Millisecond,
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Factor: 5.0,
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Jitter: 0.1,
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}
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// RetryConflict executes the provided function repeatedly, retrying if the server returns a conflicting
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// write. Callers should preserve previous executions if they wish to retry changes. It performs an
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// exponential backoff.
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//
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// var pod *api.Pod
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// err := RetryOnConflict(DefaultBackoff, func() (err error) {
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// pod, err = c.Pods("mynamespace").UpdateStatus(podStatus)
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// return
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// })
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// if err != nil {
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// // may be conflict if max retries were hit
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// return err
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// }
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// ...
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//
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// TODO: Make Backoff an interface?
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func RetryOnConflict(backoff wait.Backoff, fn func() error) error {
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var lastConflictErr error
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err := wait.ExponentialBackoff(backoff, func() (bool, error) {
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err := fn()
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switch {
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case err == nil:
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return true, nil
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case errors.IsConflict(err):
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lastConflictErr = err
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return false, nil
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default:
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return false, err
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}
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})
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if err == wait.ErrWaitTimeout {
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err = lastConflictErr
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}
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return err
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}
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