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utils.go
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/
utils.go
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package utils
import (
corev1 "k8s.io/api/core/v1"
clientset "k8s.io/client-go/kubernetes"
)
const (
EvictionKind = "Eviction"
EvictionSubresource = "pods/eviction"
EvictionAnnotation = "kube-pod-rescheduler/eviction"
)
// SupportEviction uses Discovery API to find out if the server support eviction subresource
// If support, it will return its groupVersion; Otherwise, it will return ""
func SupportEviction(client clientset.Interface) (string, error) {
discoveryClient := client.Discovery()
groupList, err := discoveryClient.ServerGroups()
if err != nil {
return "", err
}
foundPolicyGroup := false
var policyGroupVersion string
for _, group := range groupList.Groups {
if group.Name == "policy" {
foundPolicyGroup = true
policyGroupVersion = group.PreferredVersion.GroupVersion
break
}
}
if !foundPolicyGroup {
return "", nil
}
resourceList, err := discoveryClient.ServerResourcesForGroupVersion("v1")
if err != nil {
return "", err
}
for _, resource := range resourceList.APIResources {
if resource.Name == EvictionSubresource && resource.Kind == EvictionKind {
return policyGroupVersion, nil
}
}
return "", nil
}
// IsPodExists returns true if the specified pod exists.
// func IsPodExists(client clientset.Interface, podname, namespace string) bool {
// _, err := client.CoreV1().Pods(namespace).Get(podname, metav1.GetOptions{})
// return !errors.IsNotFound(err)
// }
func Annotate(client clientset.Interface, pod *corev1.Pod) {
newPod := pod.DeepCopy()
if newPod.ObjectMeta.Annotations == nil {
newPod.ObjectMeta.Annotations = make(map[string]string)
}
newPod.ObjectMeta.Annotations[EvictionAnnotation] = "true"
client.CoreV1().Pods(newPod.GetNamespace()).Update(newPod)
}