Add support for Persistent Volumes

modules/k8s/errors.go

@@ -132,6 +132,21 @@ type UnknownServiceType struct {
 	service *corev1.Service
 }
 
+// PersistentVolumeNotAvailable is returned when a Kubernetes PersistentVolume is not available
+type PersistentVolumeNotAvailable struct {
+	pv *corev1.PersistentVolume
+}
+
+// Error is a simple function to return a formatted error message as a string
+func (err PersistentVolumeNotAvailable) Error() string {
+	return fmt.Sprintf("Pv %s is not available", err.pv.Name)
+}
+
+// NewPersistentVolumeNotAvailableError returns a PersistentVolumeNotAvailable struct when the given Persistent Volume is not available
+func NewPersistentVolumeNotAvailableError(pv *corev1.PersistentVolume) PersistentVolumeNotAvailable {
+	return PersistentVolumeNotAvailable{pv}
+}
+
 // Error is a simple function to return a formatted error message as a string
 func (err UnknownServiceType) Error() string {
 	return fmt.Sprintf("Service %s has an unknown service type", err.service.Name)

modules/k8s/persistent_volume.go

@@ -0,0 +1,102 @@
+package k8s
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/stretchr/testify/require"
+
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+
+	"github.com/gruntwork-io/terratest/modules/logger"
+	"github.com/gruntwork-io/terratest/modules/retry"
+	"github.com/gruntwork-io/terratest/modules/testing"
+)
+
+// ListPersistentVolumes will look for PersistentVolumes in the given namespace that match the given filters and return them. This will fail the
+// test if there is an error.
+func ListPersistentVolumes(t testing.TestingT, options *KubectlOptions, filters metav1.ListOptions) []corev1.PersistentVolume {
+	pvs, err := ListPersistentVolumesE(t, options, filters)
+	require.NoError(t, err)
+	return pvs
+}
+
+// ListPersistentVolumesE will look for PersistentVolumes that match the given filters and return them.
+func ListPersistentVolumesE(t testing.TestingT, options *KubectlOptions, filters metav1.ListOptions) ([]corev1.PersistentVolume, error) {
+	clientset, err := GetKubernetesClientFromOptionsE(t, options)
+	if err != nil {
+		return nil, err
+	}
+
+	resp, err := clientset.CoreV1().PersistentVolumes().List(context.Background(), filters)
+	if err != nil {
+		return nil, err
+	}
+	return resp.Items, nil
+}
+
+// GetPersistentVolume returns a Kubernetes PersistentVolume resource with the given name. This will fail the test if there is an error.
+func GetPersistentVolume(t testing.TestingT, options *KubectlOptions, name string) *corev1.PersistentVolume {
+	pv, err := GetPersistentVolumeE(t, options, name)
+	require.NoError(t, err)
+	return pv
+}
+
+// GetPersistentVolumeE returns a Kubernetes PersistentVolume resource with the given name.
+func GetPersistentVolumeE(t testing.TestingT, options *KubectlOptions, name string) (*corev1.PersistentVolume, error) {
+	clientset, err := GetKubernetesClientFromOptionsE(t, options)
+	if err != nil {
+		return nil, err
+	}
+	return clientset.CoreV1().PersistentVolumes().Get(context.Background(), name, metav1.GetOptions{})
+}
+
+// WaitUntilPersistentVolumeAvailableE waits until the given Persistent Volume is the 'Available' status,
+// retrying the check for the specified amount of times, sleeping
+// for the provided duration between each try.
+// This will fail the test if there is an error.
+func WaitUntilPersistentVolumeAvailable(t testing.TestingT, options *KubectlOptions, pvName string, retries int, sleepBetweenRetries time.Duration) {
+	require.NoError(t, WaitUntilPersistentVolumeAvailableE(t, options, pvName, retries, sleepBetweenRetries))
+}
+
+// WaitUntilPersistentVolumeAvailableE waits until the given PersistentVolume is in the 'Available' status,
+// retrying the check for the specified amount of times, sleeping
+// for the provided duration between each try.
+func WaitUntilPersistentVolumeAvailableE(
+	t testing.TestingT,
+	options *KubectlOptions,
+	pvName string,
+	retries int,
+	sleepBetweenRetries time.Duration,
+) error {
+	statusMsg := fmt.Sprintf("Wait for Persistent Volume %s to be available", pvName)
+	message, err := retry.DoWithRetryE(
+		t,
+		statusMsg,
+		retries,
+		sleepBetweenRetries,
+		func() (string, error) {
+			pv, err := GetPersistentVolumeE(t, options, pvName)
+			if err != nil {
+				return "", err
+			}
+			if !IsPersistentVolumeAvailable(pv) {
+				return "", NewPersistentVolumeNotAvailableError(pv)
+			}
+			return "Persistent Volume is now available", nil
+		},
+	)
+	if err != nil {
+		logger.Logf(t, "Timedout waiting for PersistentVolume to be available: %s", err)
+		return err
+	}
+	logger.Logf(t, message)
+	return nil
+}
+
+// IsPersistentVolume returns true if the given PersistentVolume is available
+func IsPersistentVolumeAvailable(pv *corev1.PersistentVolume) bool {
+	return pv != nil && pv.Status.Phase == corev1.VolumeAvailable
+}

modules/k8s/persistent_volume_test.go

@@ -0,0 +1,103 @@
+// NOTE: we have build tags to differentiate kubernetes tests from non-kubernetes tests. This is done because minikube
+// is heavy and can interfere with docker related tests in terratest. Specifically, many of the tests start to fail with
+// `connection refused` errors from `minikube`. To avoid overloading the system, we run the kubernetes tests and helm
+// tests separately from the others. This may not be necessary if you have a sufficiently powerful machine.  We
+// recommend at least 4 cores and 16GB of RAM if you want to run all the tests together.
+
+package k8s
+
+import (
+	"fmt"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	_ "k8s.io/client-go/plugin/pkg/client/auth"
+
+	"github.com/gruntwork-io/terratest/modules/random"
+)
+
+func TestListPersistentVolumesReturnsAllPersistentVolumes(t *testing.T) {
+	t.Parallel()
+
+	numPvFound := 0
+	pvNames := map[string]struct{}{
+		strings.ToLower(random.UniqueId()): {},
+		strings.ToLower(random.UniqueId()): {},
+		strings.ToLower(random.UniqueId()): {},
+	}
+
+	options := NewKubectlOptions("", "", "")
+	for pvName := range pvNames {
+		pv := fmt.Sprintf(PvFixtureYamlTemplate, pvName, pvName)
+		defer KubectlDeleteFromString(t, options, pv)
+		KubectlApplyFromString(t, options, pv)
+	}
+
+	pvs := ListPersistentVolumes(t, options, metav1.ListOptions{})
+	for _, pv := range pvs {
+		if _, ok := pvNames[pv.Name]; ok {
+			numPvFound++
+		}
+	}
+
+	require.Equal(t, numPvFound, len(pvNames))
+}
+
+func TestListPersistentVolumesReturnsZeroPersistentVolumesIfNoneCreated(t *testing.T) {
+	t.Parallel()
+
+	options := NewKubectlOptions("", "", "")
+	pvs := ListPersistentVolumes(t, options, metav1.ListOptions{})
+	require.Equal(t, 0, len(pvs))
+}
+
+func TestGetPersistentVolumeEReturnsErrorForNonExistentPersistentVolumes(t *testing.T) {
+	t.Parallel()
+
+	options := NewKubectlOptions("", "", "")
+	_, err := GetPersistentVolumeE(t, options, "non-existent")
+	require.Error(t, err)
+}
+
+func TestGetPersistentVolumeReturnsCorrectPersistentVolume(t *testing.T) {
+	t.Parallel()
+
+	pvName := strings.ToLower(random.UniqueId())
+	options := NewKubectlOptions("", "", "")
+	configData := fmt.Sprintf(PvFixtureYamlTemplate, pvName, pvName)
+	defer KubectlDeleteFromString(t, options, configData)
+	KubectlApplyFromString(t, options, configData)
+
+	pv := GetPersistentVolume(t, options, pvName)
+	require.Equal(t, pv.Name, pvName)
+}
+
+func TestWaitUntilPersistentVolumeAvailable(t *testing.T) {
+	t.Parallel()
+
+	pvName := strings.ToLower(random.UniqueId())
+	options := NewKubectlOptions("", "", pvName)
+	configData := fmt.Sprintf(PvFixtureYamlTemplate, pvName, pvName)
+	KubectlApplyFromString(t, options, configData)
+	defer KubectlDeleteFromString(t, options, configData)
+
+	WaitUntilPersistentVolumeAvailable(t, options, pvName, 60, 1*time.Second)
+}
+
+const PvFixtureYamlTemplate = `---
+apiVersion: v1
+kind: PersistentVolume
+metadata:
+  name: %s
+spec:
+  capacity:
+    storage: 10Mi
+  accessModes:
+    - ReadWriteOnce
+  hostPath:
+    path: "/tmp/%s"
+`