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aaq-evaluator.go
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aaq-evaluator.go
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package aaq_evaluator
import (
"fmt"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/resource"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apiserver/pkg/admission"
quota "k8s.io/apiserver/pkg/quota/v1"
v12 "k8s.io/apiserver/pkg/quota/v1"
v1 "k8s.io/client-go/listers/core/v1"
"k8s.io/kubernetes/pkg/apis/core/v1/helper"
"k8s.io/kubernetes/pkg/apis/core/v1/helper/qos"
"k8s.io/kubernetes/pkg/quota/v1/evaluator/core"
"k8s.io/utils/clock"
"kubevirt.io/application-aware-quota/pkg/util"
)
// NewAaqEvaluator returns an evaluator that can evaluate pods with apps consideration
func NewAaqEvaluator(podLister v1.PodLister, aaqEvalRegistery Registry, clock clock.Clock) *AaqEvaluator {
podEvaluator := core.NewPodEvaluator(nil, clock)
return &AaqEvaluator{
podEvaluator: podEvaluator,
podLister: podLister,
aaqEvalRegistery: aaqEvalRegistery,
}
}
type AaqEvaluator struct {
podEvaluator v12.Evaluator
aaqEvalRegistery Registry
// knows how to list pods
podLister v1.PodLister
}
func (aaqe *AaqEvaluator) Constraints(_ []corev1.ResourceName, _ runtime.Object) error {
//let's not repeat kubernetes mistake: https://github.com/kubernetes/kubernetes/blob/46835f8792dfb4a17345e592d1325bf63bc054e4/pkg/quota/v1/evaluator/core/pods.go#L125
return nil
}
func (aaqe *AaqEvaluator) GroupResource() schema.GroupResource {
return aaqe.podEvaluator.GroupResource()
}
func (aaqe *AaqEvaluator) Handles(operation admission.Attributes) bool {
return aaqe.podEvaluator.Handles(operation)
}
func (aaqe *AaqEvaluator) Matches(resourceQuota *corev1.ResourceQuota, item runtime.Object) (bool, error) {
return aaqe.podEvaluator.Matches(resourceQuota, item)
}
func (aaqe *AaqEvaluator) MatchingScopes(item runtime.Object, scopes []corev1.ScopedResourceSelectorRequirement) ([]corev1.ScopedResourceSelectorRequirement, error) {
return aaqe.podEvaluator.MatchingScopes(item, scopes)
}
func (aaqe *AaqEvaluator) UncoveredQuotaScopes(limitedScopes []corev1.ScopedResourceSelectorRequirement, matchedQuotaScopes []corev1.ScopedResourceSelectorRequirement) ([]corev1.ScopedResourceSelectorRequirement, error) {
return aaqe.podEvaluator.UncoveredQuotaScopes(limitedScopes, matchedQuotaScopes)
}
func (aaqe *AaqEvaluator) MatchingResources(input []corev1.ResourceName) []corev1.ResourceName {
return aaqe.podEvaluator.MatchingResources(input)
}
func (aaqe *AaqEvaluator) Usage(item runtime.Object) (corev1.ResourceList, error) {
pod, err := util.ToExternalPodOrError(item)
if err != nil {
return corev1.ResourceList{}, err
} else if pod.Spec.SchedulingGates != nil &&
len(pod.Spec.SchedulingGates) > 0 {
return corev1.ResourceList{}, nil
}
existingPods, err := aaqe.podLister.Pods(pod.Namespace).List(labels.Everything())
if err != nil {
return corev1.ResourceList{}, fmt.Errorf("failed to list content: %v", err)
}
rl, err := aaqe.aaqEvalRegistery.Usage(pod, existingPods)
if err != nil {
return aaqe.podEvaluator.Usage(item)
}
return rl, err
}
func (aaqe *AaqEvaluator) CalculatorUsage(pod *corev1.Pod, existingPods []*corev1.Pod) (corev1.ResourceList, error) {
if pod.Spec.SchedulingGates != nil &&
len(pod.Spec.SchedulingGates) > 0 {
return corev1.ResourceList{}, nil
}
rl, err := aaqe.aaqEvalRegistery.Usage(pod, existingPods)
if err != nil {
return aaqe.podEvaluator.Usage(pod)
}
return rl, err
}
// UsageStats calculates aggregate usage for the object.
func (aaqe *AaqEvaluator) UsageStats(options v12.UsageStatsOptions) (v12.UsageStats, error) {
result := quota.UsageStats{Used: corev1.ResourceList{}}
for _, resourceName := range options.Resources {
result.Used[resourceName] = resource.Quantity{Format: resource.DecimalSI}
}
existingPods, err := aaqe.podLister.Pods(options.Namespace).List(labels.Everything())
if err != nil {
return result, fmt.Errorf("failed to list content: %v", err)
}
for _, pod := range existingPods {
// need to verify that the item matches the set of scopes
matchesScopes := true
for _, scope := range options.Scopes {
innerMatch, err := podMatchesScopeFunc(corev1.ScopedResourceSelectorRequirement{ScopeName: scope, Operator: corev1.ScopeSelectorOpExists}, pod)
if err != nil {
return result, nil
}
if !innerMatch {
matchesScopes = false
}
}
if options.ScopeSelector != nil {
for _, selector := range options.ScopeSelector.MatchExpressions {
innerMatch, err := podMatchesScopeFunc(selector, pod)
if err != nil {
return result, nil
}
matchesScopes = matchesScopes && innerMatch
}
}
// only count usage if there was a match
if matchesScopes {
usage, err := aaqe.CalculatorUsage(pod, existingPods)
if err != nil {
return result, err
}
result.Used = quota.Add(result.Used, usage)
}
}
return result, nil
}
// todo: ask kubernetes to make this funcs global and remove all this code
// podMatchesScopeFunc is a function that knows how to evaluate if a pod matches a scope
func podMatchesScopeFunc(selector corev1.ScopedResourceSelectorRequirement, object runtime.Object) (bool, error) {
pod, err := util.ToExternalPodOrError(object)
if err != nil {
return false, err
}
switch selector.ScopeName {
case corev1.ResourceQuotaScopeTerminating:
return isTerminating(pod), nil
case corev1.ResourceQuotaScopeNotTerminating:
return !isTerminating(pod), nil
case corev1.ResourceQuotaScopeBestEffort:
return isBestEffort(pod), nil
case corev1.ResourceQuotaScopeNotBestEffort:
return !isBestEffort(pod), nil
case corev1.ResourceQuotaScopePriorityClass:
if selector.Operator == corev1.ScopeSelectorOpExists {
// This is just checking for existence of a priorityClass on the pod,
// no need to take the overhead of selector parsing/evaluation.
return len(pod.Spec.PriorityClassName) != 0, nil
}
return podMatchesSelector(pod, selector)
case corev1.ResourceQuotaScopeCrossNamespacePodAffinity:
return usesCrossNamespacePodAffinity(pod), nil
}
return false, nil
}
func isTerminating(pod *corev1.Pod) bool {
if pod.Spec.ActiveDeadlineSeconds != nil && *pod.Spec.ActiveDeadlineSeconds >= int64(0) {
return true
}
return false
}
func isBestEffort(pod *corev1.Pod) bool {
return qos.GetPodQOS(pod) == corev1.PodQOSBestEffort
}
func podMatchesSelector(pod *corev1.Pod, selector corev1.ScopedResourceSelectorRequirement) (bool, error) {
labelSelector, err := helper.ScopedResourceSelectorRequirementsAsSelector(selector)
if err != nil {
return false, fmt.Errorf("failed to parse and convert selector: %v", err)
}
var m map[string]string
if len(pod.Spec.PriorityClassName) != 0 {
m = map[string]string{string(corev1.ResourceQuotaScopePriorityClass): pod.Spec.PriorityClassName}
}
if labelSelector.Matches(labels.Set(m)) {
return true, nil
}
return false, nil
}
func usesCrossNamespacePodAffinity(pod *corev1.Pod) bool {
if pod == nil || pod.Spec.Affinity == nil {
return false
}
affinity := pod.Spec.Affinity.PodAffinity
if affinity != nil {
if crossNamespacePodAffinityTerms(affinity.RequiredDuringSchedulingIgnoredDuringExecution) {
return true
}
if crossNamespaceWeightedPodAffinityTerms(affinity.PreferredDuringSchedulingIgnoredDuringExecution) {
return true
}
}
antiAffinity := pod.Spec.Affinity.PodAntiAffinity
if antiAffinity != nil {
if crossNamespacePodAffinityTerms(antiAffinity.RequiredDuringSchedulingIgnoredDuringExecution) {
return true
}
if crossNamespaceWeightedPodAffinityTerms(antiAffinity.PreferredDuringSchedulingIgnoredDuringExecution) {
return true
}
}
return false
}
func crossNamespacePodAffinityTerms(terms []corev1.PodAffinityTerm) bool {
for _, t := range terms {
if crossNamespacePodAffinityTerm(&t) {
return true
}
}
return false
}
func crossNamespacePodAffinityTerm(term *corev1.PodAffinityTerm) bool {
return len(term.Namespaces) != 0 || term.NamespaceSelector != nil
}
func crossNamespaceWeightedPodAffinityTerms(terms []corev1.WeightedPodAffinityTerm) bool {
for _, t := range terms {
if crossNamespacePodAffinityTerm(&t.PodAffinityTerm) {
return true
}
}
return false
}