mirror of
https://github.com/kubernetes-sigs/descheduler.git
synced 2026-01-26 13:29:11 +01:00
75 lines
2.4 KiB
Go
75 lines
2.4 KiB
Go
package utils
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import (
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"context"
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"fmt"
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v1 "k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/labels"
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"k8s.io/apimachinery/pkg/util/sets"
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clientset "k8s.io/client-go/kubernetes"
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"sigs.k8s.io/descheduler/pkg/api"
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)
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const SystemCriticalPriority = 2 * int32(1000000000)
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// GetNamespacesFromPodAffinityTerm returns a set of names
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// according to the namespaces indicated in podAffinityTerm.
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// If namespaces is empty it considers the given pod's namespace.
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func GetNamespacesFromPodAffinityTerm(pod *v1.Pod, podAffinityTerm *v1.PodAffinityTerm) sets.Set[string] {
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names := sets.New[string]()
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if len(podAffinityTerm.Namespaces) == 0 {
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names.Insert(pod.Namespace)
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} else {
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names.Insert(podAffinityTerm.Namespaces...)
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}
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return names
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}
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// PodMatchesTermsNamespaceAndSelector returns true if the given <pod>
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// matches the namespace and selector defined by <affinityPod>`s <term>.
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func PodMatchesTermsNamespaceAndSelector(pod *v1.Pod, namespaces sets.Set[string], selector labels.Selector) bool {
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if !namespaces.Has(pod.Namespace) {
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return false
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}
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if !selector.Matches(labels.Set(pod.Labels)) {
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return false
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}
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return true
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}
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// GetPriorityFromPriorityClass gets priority from the given priority class.
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// If no priority class is provided, it will return SystemCriticalPriority by default.
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func GetPriorityFromPriorityClass(ctx context.Context, client clientset.Interface, name string) (int32, error) {
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if name != "" {
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priorityClass, err := client.SchedulingV1().PriorityClasses().Get(ctx, name, metav1.GetOptions{})
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if err != nil {
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return 0, err
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}
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return priorityClass.Value, nil
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}
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return SystemCriticalPriority, nil
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}
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// GetPriorityValueFromPriorityThreshold gets priority from the given PriorityThreshold.
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// It will return SystemCriticalPriority by default.
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func GetPriorityValueFromPriorityThreshold(ctx context.Context, client clientset.Interface, priorityThreshold *api.PriorityThreshold) (priority int32, err error) {
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if priorityThreshold == nil {
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return SystemCriticalPriority, nil
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}
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if priorityThreshold.Value != nil {
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priority = *priorityThreshold.Value
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} else {
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priority, err = GetPriorityFromPriorityClass(ctx, client, priorityThreshold.Name)
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if err != nil {
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return 0, fmt.Errorf("unable to get priority value from the priority class: %v", err)
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}
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}
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if priority > SystemCriticalPriority {
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return 0, fmt.Errorf("priority threshold can't be greater than %d", SystemCriticalPriority)
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}
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return
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}
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