// StatefulSetHasDesiredPets returns a conditon that checks the number of petset replicas
func StatefulSetHasDesiredPets(psClient appsclient.StatefulSetsGetter, petset *apps.StatefulSet) wait.ConditionFunc {
// TODO: Differentiate between 0 pets and a really quick scale down using generation.
return func() (bool, error) {
ps, err := psClient.StatefulSets(petset.Namespace).Get(petset.Name)
if err != nil {
return false, err
}
return ps.Status.Replicas == ps.Spec.Replicas, nil
}
}
// updatePetCount attempts to update the Status.Replicas of the given StatefulSet, with a single GET/PUT retry.
func updatePetCount(psClient appsclientset.StatefulSetsGetter, ps apps.StatefulSet, numPets int) (updateErr error) {
if ps.Status.Replicas == int32(numPets) || psClient == nil {
return nil
}
var getErr error
for i, ps := 0, &ps; ; i++ {
glog.V(4).Infof(fmt.Sprintf("Updating replica count for StatefulSet: %s/%s, ", ps.Namespace, ps.Name) +
fmt.Sprintf("replicas %d->%d (need %d), ", ps.Status.Replicas, numPets, ps.Spec.Replicas))
ps.Status = apps.StatefulSetStatus{Replicas: int32(numPets)}
_, updateErr = psClient.StatefulSets(ps.Namespace).UpdateStatus(ps)
if updateErr == nil || i >= statusUpdateRetries {
return updateErr
}
if ps, getErr = psClient.StatefulSets(ps.Namespace).Get(ps.Name); getErr != nil {
return getErr
}
}
}