// UpdateRSWithRetries updates a RS with given applyUpdate function. Note that RS not found error is ignored.
// The returned bool value can be used to tell if the RS is actually updated.
func UpdateRSWithRetries(rsClient unversionedextensions.ReplicaSetInterface, rsLister *cache.StoreToReplicaSetLister, namespace, name string, applyUpdate updateRSFunc) (*extensions.ReplicaSet, error) {
var rs *extensions.ReplicaSet
retryErr := retry.RetryOnConflict(retry.DefaultBackoff, func() error {
var err error
rs, err = rsLister.ReplicaSets(namespace).Get(name)
if err != nil {
return err
}
obj, deepCopyErr := api.Scheme.DeepCopy(rs)
if deepCopyErr != nil {
return deepCopyErr
}
rs = obj.(*extensions.ReplicaSet)
// Apply the update, then attempt to push it to the apiserver.
if applyErr := applyUpdate(rs); applyErr != nil {
return applyErr
}
rs, err = rsClient.Update(rs)
return err
})
// Ignore the precondition violated error, but the RS isn't updated.
if retryErr == errorsutil.ErrPreconditionViolated {
glog.V(4).Infof("Replica set %s/%s precondition doesn't hold, skip updating it.", namespace, name)
retryErr = nil
}
return rs, retryErr
}
