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kubernetes_helper.go
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kubernetes_helper.go
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package testutil
import (
"fmt"
"os/exec"
"regexp"
"strings"
coreV1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/clientcmd"
// Loads the GCP auth plugin
_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
)
// KubernetesHelper provides Kubernetes-related test helpers. It connects to the
// Kubernetes API using the environment's configured kubeconfig file.
type KubernetesHelper struct {
clientset *kubernetes.Clientset
}
// NewKubernetesHelper creates a new instance of KubernetesHelper.
func NewKubernetesHelper() (*KubernetesHelper, error) {
rules := clientcmd.NewDefaultClientConfigLoadingRules()
overrides := &clientcmd.ConfigOverrides{}
kubeConfig := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(rules, overrides)
config, err := kubeConfig.ClientConfig()
if err != nil {
return nil, err
}
clientset, err := kubernetes.NewForConfig(config)
if err != nil {
return nil, err
}
return &KubernetesHelper{
clientset: clientset,
}, nil
}
// CheckIfNamespaceExists checks if a namespace exists.
func (h *KubernetesHelper) CheckIfNamespaceExists(namespace string) error {
_, err := h.clientset.CoreV1().Namespaces().Get(namespace, metav1.GetOptions{})
return err
}
// CreateNamespaceIfNotExists creates a namespace if it does not already exist.
func (h *KubernetesHelper) CreateNamespaceIfNotExists(namespace string) error {
err := h.CheckIfNamespaceExists(namespace)
if err != nil {
ns := &coreV1.Namespace{ObjectMeta: metav1.ObjectMeta{Name: namespace}}
_, err = h.clientset.CoreV1().Namespaces().Create(ns)
if err != nil {
return err
}
}
return nil
}
// KubectlApply applies a given configuration string in a namespace. If the
// namespace does not exist, it creates it first. If no namespace is provided,
// it uses the default namespace.
func (h *KubernetesHelper) KubectlApply(stdin string, namespace string) (string, error) {
if namespace == "" {
namespace = "default"
}
err := h.CreateNamespaceIfNotExists(namespace)
if err != nil {
return "", err
}
cmd := exec.Command("kubectl", "apply", "-f", "-", "--namespace", namespace)
cmd.Stdin = strings.NewReader(stdin)
out, err := cmd.CombinedOutput()
return string(out), err
}
// getDeployments gets all deployments with a count of their ready replicas in
// the specified namespace.
func (h *KubernetesHelper) getDeployments(namespace string) (map[string]int, error) {
deploys, err := h.clientset.AppsV1().Deployments(namespace).List(metav1.ListOptions{})
if err != nil {
return nil, err
}
deployments := map[string]int{}
for _, deploy := range deploys.Items {
deployments[deploy.GetName()] = int(deploy.Status.ReadyReplicas)
}
return deployments, nil
}
// CheckDeployment checks that a deployment in a namespace contains the expected
// number of replicas.
func (h *KubernetesHelper) CheckDeployment(namespace string, deploymentName string, replicas int) error {
deploys, err := h.getDeployments(namespace)
if err != nil {
return err
}
count, ok := deploys[deploymentName]
if !ok {
return fmt.Errorf("Deployment [%s] in namespace [%s] not found",
deploymentName, namespace)
}
if count != replicas {
return fmt.Errorf("Expected deployment [%s] in namespace [%s] to have [%d] replicas, but found [%d]",
deploymentName, namespace, replicas, count)
}
return nil
}
// getPods gets all pods with their pod status in the specified namespace.
func (h *KubernetesHelper) getPods(namespace string) (map[string]coreV1.PodPhase, error) {
pods, err := h.clientset.CoreV1().Pods(namespace).List(metav1.ListOptions{})
if err != nil {
return nil, err
}
podData := make(map[string]coreV1.PodPhase)
for _, pod := range pods.Items {
podData[pod.GetName()] = pod.Status.Phase
}
return podData, nil
}
// CheckPods checks that a deployment in a namespace contains the expected
// number of pods in the Running state.
func (h *KubernetesHelper) CheckPods(namespace string, deploymentName string, replicas int) error {
podData, err := h.getPods(namespace)
if err != nil {
return err
}
var runningPods []string
for name, status := range podData {
if strings.Contains(name, deploymentName) {
if status == "Running" {
runningPods = append(runningPods, name)
}
}
}
if len(runningPods) != replicas {
return fmt.Errorf("Expected deployment [%s] in namespace [%s] to have [%d] running pods, but found [%d]",
deploymentName, namespace, replicas, len(runningPods))
}
return nil
}
// CheckService checks that a service exists in a namespace.
func (h *KubernetesHelper) CheckService(namespace string, serviceName string) error {
_, err := h.clientset.CoreV1().Services(namespace).Get(serviceName, metav1.GetOptions{})
return err
}
// GetJobStatus gets the status of a job running in a namespace. If the job does
// not exist it return an error.
func (h *KubernetesHelper) GetJobStatus(namespace, jobName string) (string, error) {
job, err := h.clientset.BatchV1().Jobs(namespace).Get(jobName, metav1.GetOptions{})
if err != nil {
return "", err
}
status := job.Status
if status.CompletionTime != nil {
if status.Failed > 0 {
return "Failed", nil
}
return "Completed", nil
}
return "Running", nil
}
// ParseNamespacedResource extracts a namespace and resource name from a string
// that's in the format namespace/resource. If the strings is in a different
// format it returns an error.
func (h *KubernetesHelper) ParseNamespacedResource(resource string) (string, string, error) {
r := regexp.MustCompile("^(.+)\\/(.+)$")
matches := r.FindAllStringSubmatch(resource, 2)
if len(matches) == 0 {
return "", "", fmt.Errorf("string [%s] didn't contain expected format for namespace/resource, extracted: %v", resource, matches)
}
return matches[0][1], matches[0][2], nil
}