func (l *lifecycle) Admit(a admission.Attributes) (err error) {
// prevent deletion of immortal namespaces
if a.GetOperation() == admission.Delete {
if a.GetKind() == "Namespace" && l.immortalNamespaces.Has(a.GetName()) {
return errors.NewForbidden(a.GetKind(), a.GetName(), fmt.Errorf("namespace can never be deleted"))
}
return nil
}
defaultVersion, kind, err := latest.RESTMapper.VersionAndKindForResource(a.GetResource())
if err != nil {
return admission.NewForbidden(a, err)
}
mapping, err := latest.RESTMapper.RESTMapping(kind, defaultVersion)
if err != nil {
return admission.NewForbidden(a, err)
}
if mapping.Scope.Name() != meta.RESTScopeNameNamespace {
return nil
}
namespaceObj, exists, err := l.store.Get(&api.Namespace{
ObjectMeta: api.ObjectMeta{
Name: a.GetNamespace(),
Namespace: "",
},
})
if err != nil {
return admission.NewForbidden(a, err)
}
if !exists {
return nil
}
namespace := namespaceObj.(*api.Namespace)
if namespace.Status.Phase != api.NamespaceTerminating {
return nil
}
return admission.NewForbidden(a, fmt.Errorf("Unable to create new content in namespace %s because it is being terminated.", a.GetNamespace()))
}
// Admit admits resources into cluster that do not violate any defined LimitRange in the namespace
func (l *limitRanger) Admit(a admission.Attributes) (err error) {
// Ignore all calls to subresources
if a.GetSubresource() != "" {
return nil
}
obj := a.GetObject()
resource := a.GetResource()
name := "Unknown"
if obj != nil {
name, _ = meta.NewAccessor().Name(obj)
if len(name) == 0 {
name, _ = meta.NewAccessor().GenerateName(obj)
}
}
key := &api.LimitRange{
ObjectMeta: api.ObjectMeta{
Namespace: a.GetNamespace(),
Name: "",
},
}
items, err := l.indexer.Index("namespace", key)
if err != nil {
return admission.NewForbidden(a, fmt.Errorf("Unable to %s %s at this time because there was an error enforcing limit ranges", a.GetOperation(), resource))
}
if len(items) == 0 {
return nil
}
// ensure it meets each prescribed min/max
for i := range items {
limitRange := items[i].(*api.LimitRange)
err = l.limitFunc(limitRange, a.GetResource(), a.GetObject())
if err != nil {
return admission.NewForbidden(a, err)
}
}
return nil
}
func (q *quota) Admit(a admission.Attributes) (err error) {
if a.GetSubresource() != "" {
return nil
}
if a.GetOperation() == "DELETE" {
return nil
}
key := &api.ResourceQuota{
ObjectMeta: api.ObjectMeta{
Namespace: a.GetNamespace(),
Name: "",
},
}
// concurrent operations that modify quota tracked resources can cause a conflict when incrementing usage
// as a result, we will attempt to increment quota usage per request up to numRetries limit
// we fuzz each retry with an interval period to attempt to improve end-user experience during concurrent operations
numRetries := 10
interval := time.Duration(rand.Int63n(90)+int64(10)) * time.Millisecond
items, err := q.indexer.Index("namespace", key)
if err != nil {
return admission.NewForbidden(a, fmt.Errorf("Unable to %s %s at this time because there was an error enforcing quota", a.GetOperation(), a.GetResource()))
}
if len(items) == 0 {
return nil
}
for i := range items {
quota := items[i].(*api.ResourceQuota)
for retry := 1; retry <= numRetries; retry++ {
// we cannot modify the value directly in the cache, so we copy
status := &api.ResourceQuotaStatus{
Hard: api.ResourceList{},
Used: api.ResourceList{},
}
for k, v := range quota.Status.Hard {
status.Hard[k] = *v.Copy()
}
for k, v := range quota.Status.Used {
status.Used[k] = *v.Copy()
}
dirty, err := IncrementUsage(a, status, q.client)
if err != nil {
return admission.NewForbidden(a, err)
}
if dirty {
// construct a usage record
usage := api.ResourceQuota{
ObjectMeta: api.ObjectMeta{
Name: quota.Name,
Namespace: quota.Namespace,
ResourceVersion: quota.ResourceVersion,
Labels: quota.Labels,
Annotations: quota.Annotations},
}
usage.Status = *status
_, err = q.client.ResourceQuotas(usage.Namespace).UpdateStatus(&usage)
if err == nil {
break
}
// we have concurrent requests to update quota, so look to retry if needed
if retry == numRetries {
return admission.NewForbidden(a, fmt.Errorf("Unable to %s %s at this time because there are too many concurrent requests to increment quota", a.GetOperation(), a.GetResource()))
}
time.Sleep(interval)
// manually get the latest quota
quota, err = q.client.ResourceQuotas(usage.Namespace).Get(quota.Name)
if err != nil {
return admission.NewForbidden(a, err)
}
}
}
}
return nil
}
// IncrementUsage updates the supplied ResourceQuotaStatus object based on the incoming operation
// Return true if the usage must be recorded prior to admitting the new resource
// Return an error if the operation should not pass admission control
func IncrementUsage(a admission.Attributes, status *api.ResourceQuotaStatus, client client.Interface) (bool, error) {
dirty := false
set := map[api.ResourceName]bool{}
for k := range status.Hard {
set[k] = true
}
obj := a.GetObject()
// handle max counts for each kind of resource (pods, services, replicationControllers, etc.)
if a.GetOperation() == admission.Create {
// TODO v1beta1 had camel case, v1beta3 went to all lower, we can remove this line when we deprecate v1beta1
resourceNormalized := strings.ToLower(a.GetResource())
resourceName := resourceToResourceName[resourceNormalized]
hard, hardFound := status.Hard[resourceName]
if hardFound {
used, usedFound := status.Used[resourceName]
if !usedFound {
return false, fmt.Errorf("Quota usage stats are not yet known, unable to admit resource until an accurate count is completed.")
}
if used.Value() >= hard.Value() {
return false, fmt.Errorf("Limited to %s %s", hard.String(), resourceName)
} else {
status.Used[resourceName] = *resource.NewQuantity(used.Value()+int64(1), resource.DecimalSI)
dirty = true
}
}
}
// handle memory/cpu constraints, and any diff of usage based on memory/cpu on updates
if a.GetResource() == "pods" && (set[api.ResourceMemory] || set[api.ResourceCPU]) {
pod := obj.(*api.Pod)
deltaCPU := resourcequota.PodCPU(pod)
deltaMemory := resourcequota.PodMemory(pod)
// if this is an update, we need to find the delta cpu/memory usage from previous state
if a.GetOperation() == admission.Update {
oldPod, err := client.Pods(a.GetNamespace()).Get(pod.Name)
if err != nil {
return false, err
}
oldCPU := resourcequota.PodCPU(oldPod)
oldMemory := resourcequota.PodMemory(oldPod)
deltaCPU = resource.NewMilliQuantity(deltaCPU.MilliValue()-oldCPU.MilliValue(), resource.DecimalSI)
deltaMemory = resource.NewQuantity(deltaMemory.Value()-oldMemory.Value(), resource.DecimalSI)
}
hardMem, hardMemFound := status.Hard[api.ResourceMemory]
if hardMemFound {
if set[api.ResourceMemory] && resourcequota.IsPodMemoryUnbounded(pod) {
return false, fmt.Errorf("Limited to %s memory, but pod has no specified memory limit", hardMem.String())
}
used, usedFound := status.Used[api.ResourceMemory]
if !usedFound {
return false, fmt.Errorf("Quota usage stats are not yet known, unable to admit resource until an accurate count is completed.")
}
if used.Value()+deltaMemory.Value() > hardMem.Value() {
return false, fmt.Errorf("Limited to %s memory", hardMem.String())
} else {
status.Used[api.ResourceMemory] = *resource.NewQuantity(used.Value()+deltaMemory.Value(), resource.DecimalSI)
dirty = true
}
}
hardCPU, hardCPUFound := status.Hard[api.ResourceCPU]
if hardCPUFound {
if set[api.ResourceCPU] && resourcequota.IsPodCPUUnbounded(pod) {
return false, fmt.Errorf("Limited to %s CPU, but pod has no specified cpu limit", hardCPU.String())
}
used, usedFound := status.Used[api.ResourceCPU]
if !usedFound {
return false, fmt.Errorf("Quota usage stats are not yet known, unable to admit resource until an accurate count is completed.")
}
if used.MilliValue()+deltaCPU.MilliValue() > hardCPU.MilliValue() {
return false, fmt.Errorf("Limited to %s CPU", hardCPU.String())
} else {
status.Used[api.ResourceCPU] = *resource.NewMilliQuantity(used.MilliValue()+deltaCPU.MilliValue(), resource.DecimalSI)
dirty = true
}
}
}
return dirty, nil
}