// limitRequestRatioConstraint enforces the limit to request ratio over the specified resource
func limitRequestRatioConstraint(limitType api.LimitType, resourceName api.ResourceName, enforced resource.Quantity, request api.ResourceList, limit api.ResourceList) error {
req, reqExists := request[resourceName]
lim, limExists := limit[resourceName]
observedReqValue, observedLimValue, _ := requestLimitEnforcedValues(req, lim, enforced)
if !reqExists || (observedReqValue == int64(0)) {
return fmt.Errorf("%s max limit to request ratio per %s is %s, but no request is specified or request is 0.", resourceName, limitType, enforced.String())
}
if !limExists || (observedLimValue == int64(0)) {
return fmt.Errorf("%s max limit to request ratio per %s is %s, but no limit is specified or limit is 0.", resourceName, limitType, enforced.String())
}
observedRatio := float64(observedLimValue) / float64(observedReqValue)
displayObservedRatio := observedRatio
maxLimitRequestRatio := float64(enforced.Value())
if enforced.Value() <= resource.MaxMilliValue {
observedRatio = observedRatio * 1000
maxLimitRequestRatio = float64(enforced.MilliValue())
}
if observedRatio > maxLimitRequestRatio {
return fmt.Errorf("%s max limit to request ratio per %s is %s, but provided ratio is %f.", resourceName, limitType, enforced.String(), displayObservedRatio)
}
return nil
}
// requestLimitEnforcedValues returns the specified values at a common precision to support comparability
func requestLimitEnforcedValues(requestQuantity, limitQuantity, enforcedQuantity resource.Quantity) (request, limit, enforced int64) {
request = requestQuantity.Value()
limit = limitQuantity.Value()
enforced = enforcedQuantity.Value()
// do a more precise comparison if possible (if the value won't overflow)
if request <= resource.MaxMilliValue && limit <= resource.MaxMilliValue && enforced <= resource.MaxMilliValue {
request = requestQuantity.MilliValue()
limit = limitQuantity.MilliValue()
enforced = enforcedQuantity.MilliValue()
}
return
}
func makeKBitString(rsrc *resource.Quantity) string {
return fmt.Sprintf("%dkbit", (rsrc.Value() / 1000))
}
// syncResourceQuota runs a complete sync of current status
func (rm *ResourceQuotaController) syncResourceQuota(quota api.ResourceQuota) (err error) {
// quota is dirty if any part of spec hard limits differs from the status hard limits
dirty := !api.Semantic.DeepEqual(quota.Spec.Hard, quota.Status.Hard)
// dirty tracks if the usage status differs from the previous sync,
// if so, we send a new usage with latest status
// if this is our first sync, it will be dirty by default, since we need track usage
dirty = dirty || (quota.Status.Hard == nil || quota.Status.Used == nil)
// Create a usage object that is based on the quota resource version
usage := api.ResourceQuota{
ObjectMeta: api.ObjectMeta{
Name: quota.Name,
Namespace: quota.Namespace,
ResourceVersion: quota.ResourceVersion,
Labels: quota.Labels,
Annotations: quota.Annotations},
Status: api.ResourceQuotaStatus{
Hard: api.ResourceList{},
Used: api.ResourceList{},
},
}
// set the hard values supported on the quota
for k, v := range quota.Spec.Hard {
usage.Status.Hard[k] = *v.Copy()
}
// set any last known observed status values for usage
for k, v := range quota.Status.Used {
usage.Status.Used[k] = *v.Copy()
}
set := map[api.ResourceName]bool{}
for k := range usage.Status.Hard {
set[k] = true
}
pods := &api.PodList{}
if set[api.ResourcePods] || set[api.ResourceMemory] || set[api.ResourceCPU] {
pods, err = rm.kubeClient.Pods(usage.Namespace).List(labels.Everything(), fields.Everything())
if err != nil {
return err
}
}
filteredPods := FilterQuotaPods(pods.Items)
// iterate over each resource, and update observation
for k := range usage.Status.Hard {
// look if there is a used value, if none, we are definitely dirty
prevQuantity, found := usage.Status.Used[k]
if !found {
dirty = true
}
var value *resource.Quantity
switch k {
case api.ResourcePods:
value = resource.NewQuantity(int64(len(filteredPods)), resource.DecimalSI)
case api.ResourceServices:
items, err := rm.kubeClient.Services(usage.Namespace).List(labels.Everything())
if err != nil {
return err
}
value = resource.NewQuantity(int64(len(items.Items)), resource.DecimalSI)
case api.ResourceReplicationControllers:
items, err := rm.kubeClient.ReplicationControllers(usage.Namespace).List(labels.Everything())
if err != nil {
return err
}
value = resource.NewQuantity(int64(len(items.Items)), resource.DecimalSI)
case api.ResourceQuotas:
items, err := rm.kubeClient.ResourceQuotas(usage.Namespace).List(labels.Everything())
if err != nil {
return err
}
value = resource.NewQuantity(int64(len(items.Items)), resource.DecimalSI)
case api.ResourceSecrets:
items, err := rm.kubeClient.Secrets(usage.Namespace).List(labels.Everything(), fields.Everything())
if err != nil {
return err
}
value = resource.NewQuantity(int64(len(items.Items)), resource.DecimalSI)
case api.ResourcePersistentVolumeClaims:
items, err := rm.kubeClient.PersistentVolumeClaims(usage.Namespace).List(labels.Everything(), fields.Everything())
if err != nil {
return err
}
value = resource.NewQuantity(int64(len(items.Items)), resource.DecimalSI)
case api.ResourceMemory:
value = PodsRequests(filteredPods, api.ResourceMemory)
case api.ResourceCPU:
value = PodsRequests(filteredPods, api.ResourceCPU)
}
// ignore fields we do not understand (assume another controller is tracking it)
if value != nil {
// see if the value has changed
dirty = dirty || (value.Value() != prevQuantity.Value())
// just update the value
usage.Status.Used[k] = *value
}
}
// update the usage only if it changed
if dirty {
_, err = rm.kubeClient.ResourceQuotas(usage.Namespace).UpdateStatus(&usage)
return err
}
return nil
}
