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pod.go
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pod.go
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package utils
import (
"fmt"
"strings"
"time"
"github.com/onsi/ginkgo"
k8sv1 "k8s.io/api/core/v1"
v1 "k8s.io/api/core/v1"
k8serrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/kubernetes"
)
const (
// PodWaitForTime is the time to wait for Pod operations to complete
PodWaitForTime = defaultPollPeriod
podCreateTime = defaultPollPeriod
podDeleteTime = defaultPollPeriod
)
// CreateExecutorPodWithPVC creates a Pod with the passed in PVC mounted under /pvc. You can then use the executor utilities to
// run commands against the PVC through this Pod.
func CreateExecutorPodWithPVC(clientSet *kubernetes.Clientset, podName, namespace string, pvc *k8sv1.PersistentVolumeClaim) (*k8sv1.Pod, error) {
return CreatePod(clientSet, namespace, newExecutorPodWithPVC(podName, pvc))
}
// CreateExecutorPodWithPVCSpecificNode creates a Pod on a specific node with the passed in PVC mounted under /pvc. You can then use the executor utilities to
// run commands against the PVC through this Pod.
func CreateExecutorPodWithPVCSpecificNode(clientSet *kubernetes.Clientset, podName, namespace string, pvc *k8sv1.PersistentVolumeClaim, node string) (*k8sv1.Pod, error) {
var pod = newExecutorPodWithPVC(podName, pvc)
pod.Spec.NodeSelector = map[string]string{
"kubernetes.io/hostname": node,
}
return CreatePod(clientSet, namespace, pod)
}
// CreatePod calls the Kubernetes API to create a Pod
func CreatePod(clientSet *kubernetes.Clientset, namespace string, podDef *k8sv1.Pod) (*k8sv1.Pod, error) {
var pod *k8sv1.Pod
err := wait.PollImmediate(2*time.Second, podCreateTime, func() (bool, error) {
var err error
pod, err = clientSet.CoreV1().Pods(namespace).Create(podDef)
if err != nil {
return false, err
}
return true, nil
})
return pod, err
}
// DeletePod deletes the passed in Pod from the passed in Namespace
func DeletePod(clientSet *kubernetes.Clientset, pod *k8sv1.Pod, namespace string) error {
return wait.PollImmediate(2*time.Second, podDeleteTime, func() (bool, error) {
err := clientSet.CoreV1().Pods(namespace).Delete(pod.GetName(), &metav1.DeleteOptions{})
if err != nil {
return false, nil
}
return true, nil
})
}
// NewPodWithPVC creates a new pod that mounts the given PVC
func NewPodWithPVC(podName, cmd string, pvc *k8sv1.PersistentVolumeClaim) *k8sv1.Pod {
pod := &k8sv1.Pod{
ObjectMeta: metav1.ObjectMeta{Name: podName},
Spec: k8sv1.PodSpec{
RestartPolicy: k8sv1.RestartPolicyNever,
Containers: []k8sv1.Container{
{
Name: "runner",
Image: "registry.fedoraproject.org/fedora-minimal:29",
Command: []string{"/bin/sh", "-c", cmd},
},
},
Volumes: []k8sv1.Volume{
{
Name: pvc.GetName(),
VolumeSource: k8sv1.VolumeSource{
PersistentVolumeClaim: &k8sv1.PersistentVolumeClaimVolumeSource{
ClaimName: pvc.GetName(),
},
},
},
},
},
}
volumeMode := pvc.Spec.VolumeMode
if volumeMode != nil && *volumeMode == v1.PersistentVolumeBlock {
pod.Spec.Containers[0].VolumeDevices = addVolumeDevices(pvc)
} else {
pod.Spec.Containers[0].VolumeMounts = addVolumeMounts(pvc)
}
return pod
}
func addVolumeDevices(pvc *k8sv1.PersistentVolumeClaim) []v1.VolumeDevice {
volumeDevices := []v1.VolumeDevice{
{
Name: pvc.GetName(),
DevicePath: DefaultPvcMountPath,
},
}
return volumeDevices
}
// this is being called for pods using PV with filesystem volume mode
func addVolumeMounts(pvc *k8sv1.PersistentVolumeClaim) []v1.VolumeMount {
volumeMounts := []v1.VolumeMount{
{
Name: pvc.GetName(),
MountPath: DefaultPvcMountPath,
},
}
return volumeMounts
}
// FindPodByPrefix finds the first pod which has the passed in prefix. Returns error if multiple pods with the same prefix are found.
func FindPodByPrefix(clientSet *kubernetes.Clientset, namespace, prefix, labelSelector string) (*k8sv1.Pod, error) {
var result k8sv1.Pod
var foundPod bool
err := wait.PollImmediate(2*time.Second, podCreateTime, func() (bool, error) {
podList, err := clientSet.CoreV1().Pods(namespace).List(metav1.ListOptions{
LabelSelector: labelSelector,
})
if err == nil {
for _, pod := range podList.Items {
if strings.HasPrefix(pod.Name, prefix) {
if !foundPod {
foundPod = true
result = pod
} else {
fmt.Fprintf(ginkgo.GinkgoWriter, "INFO: First pod name %s in namespace %s\n", result.Name, result.Namespace)
fmt.Fprintf(ginkgo.GinkgoWriter, "INFO: Second pod name %s in namespace %s\n", pod.Name, pod.Namespace)
return true, fmt.Errorf("Multiple pods starting with prefix %q in namespace %q", prefix, namespace)
}
}
}
}
return foundPod, nil
})
if !foundPod {
return nil, fmt.Errorf("Unable to find pod starting with prefix %s", prefix)
}
return &result, err
}
func newExecutorPodWithPVC(podName string, pvc *k8sv1.PersistentVolumeClaim) *k8sv1.Pod {
return NewPodWithPVC(podName, "sleep 30; echo I am an executor pod;", pvc)
}
// WaitTimeoutForPodReady waits for the given pod to be created and ready
func WaitTimeoutForPodReady(clientSet *kubernetes.Clientset, podName, namespace string, timeout time.Duration) error {
return WaitTimeoutForPodStatus(clientSet, podName, namespace, k8sv1.PodRunning, timeout)
}
// WaitTimeoutForPodSucceeded waits for pod to succeed
func WaitTimeoutForPodSucceeded(clientSet *kubernetes.Clientset, podName, namespace string, timeout time.Duration) error {
return WaitTimeoutForPodStatus(clientSet, podName, namespace, k8sv1.PodSucceeded, timeout)
}
// WaitTimeoutForPodFailed waits for pod to fail
func WaitTimeoutForPodFailed(clientSet *kubernetes.Clientset, podName, namespace string, timeout time.Duration) error {
return WaitTimeoutForPodStatus(clientSet, podName, namespace, k8sv1.PodFailed, timeout)
}
// WaitTimeoutForPodStatus waits for the given pod to be created and have a expected status
func WaitTimeoutForPodStatus(clientSet *kubernetes.Clientset, podName, namespace string, status k8sv1.PodPhase, timeout time.Duration) error {
return wait.PollImmediate(2*time.Second, timeout, podStatus(clientSet, podName, namespace, status))
}
func podStatus(clientSet *kubernetes.Clientset, podName, namespace string, status k8sv1.PodPhase) wait.ConditionFunc {
return func() (bool, error) {
pod, err := clientSet.CoreV1().Pods(namespace).Get(podName, metav1.GetOptions{})
if err != nil {
if k8serrors.IsNotFound(err) {
return false, nil
}
return false, err
}
fmt.Fprintf(ginkgo.GinkgoWriter, "INFO: Checking POD phase: %s\n", string(pod.Status.Phase))
switch pod.Status.Phase {
case status:
return true, nil
}
return false, nil
}
}
// PodGetNode returns the node on which a given pod is executing
func PodGetNode(clientSet *kubernetes.Clientset, podName, namespace string) (string, error) {
pod, err := clientSet.CoreV1().Pods(namespace).Get(podName, metav1.GetOptions{})
if err != nil {
return "", err
}
return pod.Spec.NodeName, nil
}
// WaitPodDeleted waits fo a pod to no longer exist
// returns whether the pod is deleted along with any error
func WaitPodDeleted(clientSet *kubernetes.Clientset, podName, namespace string, timeout time.Duration) (bool, error) {
var result bool
err := wait.PollImmediate(2*time.Second, timeout, func() (bool, error) {
_, err := clientSet.CoreV1().Pods(namespace).Get(podName, metav1.GetOptions{})
if err != nil {
if k8serrors.IsNotFound(err) {
result = true
return true, nil
}
return false, err
}
return false, nil
})
return result, err
}
// IsExpectedNode waits to check if the specified pod is schedule on the specified node
func IsExpectedNode(clientSet *kubernetes.Clientset, nodeName, podName, namespace string, timeout time.Duration) error {
return wait.PollImmediate(2*time.Second, timeout, isExpectedNode(clientSet, nodeName, podName, namespace))
}
// returns true is the specified pod running on the specified nodeName. Otherwise returns false
func isExpectedNode(clientSet *kubernetes.Clientset, nodeName, podName, namespace string) wait.ConditionFunc {
return func() (bool, error) {
pod, err := clientSet.CoreV1().Pods(namespace).Get(podName, metav1.GetOptions{})
if err != nil {
if k8serrors.IsNotFound(err) {
return false, nil
}
return false, err
}
fmt.Fprintf(ginkgo.GinkgoWriter, "INFO: Checking Node name: %s\n", string(pod.Spec.NodeName))
if pod.Spec.NodeName == nodeName {
return true, nil
}
return false, nil
}
}
// GetSchedulableNode return a schedulable node from a nodes list
func GetSchedulableNode(nodes *v1.NodeList) *string {
for _, node := range nodes.Items {
if node.Spec.Taints == nil {
return &node.Name
}
schedulableNode := true
for _, taint := range node.Spec.Taints {
if taint.Effect == "NoSchedule" {
schedulableNode = false
break
}
}
if schedulableNode {
return &node.Name
}
}
return nil
}