Add support for EBS CSI Driver

.gitignore

@@ -104,3 +104,5 @@ e2e/tls
 mocks
 
 ui/.npm/
+
+.DS_Store

charts/postgres-operator/templates/clusterrole.yaml

@@ -141,7 +141,7 @@ rules:
   - get
   - list
   - patch
-{{- if toString .Values.configKubernetes.storage_resize_mode | eq "pvc" }}
+{{- if or (toString .Values.configKubernetes.storage_resize_mode | eq "pvc") (toString .Values.configKubernetes.storage_resize_mode | eq "mixed") }}
   - update
 {{- end }}
  # to read existing PVs. Creation should be done via dynamic provisioning

pkg/cluster/volumes.go

@@ -151,7 +151,7 @@ func (c *Cluster) populateVolumeMetaData() error {
 	volumeIds := []string{}
 	var volumeID string
 	for _, pv := range pvs {
-		volumeID, err = c.VolumeResizer.ExtractVolumeID(pv.Spec.AWSElasticBlockStore.VolumeID)
+		volumeID, err = c.VolumeResizer.GetProviderVolumeID(pv)
 		if err != nil {
 			continue
 		}

pkg/util/constants/aws.go

@@ -7,6 +7,7 @@ const (
 	// EBS related constants
 	EBSVolumeIDStart = "/vol-"
 	EBSProvisioner   = "kubernetes.io/aws-ebs"
+	EBSDriver        = "ebs.csi.aws.com"
 	//https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_VolumeModification.html
 	EBSVolumeStateModifying     = "modifying"
 	EBSVolumeStateOptimizing    = "optimizing"

pkg/util/volumes/ebs.go

@@ -36,7 +36,8 @@ func (r *EBSVolumeResizer) IsConnectedToProvider() bool {
 
 // VolumeBelongsToProvider checks if the given persistent volume is backed by EBS.
 func (r *EBSVolumeResizer) VolumeBelongsToProvider(pv *v1.PersistentVolume) bool {
-	return pv.Spec.AWSElasticBlockStore != nil && pv.Annotations[constants.VolumeStorateProvisionerAnnotation] == constants.EBSProvisioner
+	return (pv.Spec.AWSElasticBlockStore != nil && pv.Annotations[constants.VolumeStorateProvisionerAnnotation] == constants.EBSProvisioner) ||
+		(pv.Spec.CSI != nil && pv.Spec.CSI.Driver == constants.EBSDriver)
 }
 
 // ExtractVolumeID extracts volumeID from "aws://eu-central-1a/vol-075ddfc4a127d0bd4"
@@ -54,7 +55,12 @@ func (r *EBSVolumeResizer) ExtractVolumeID(volumeID string) (string, error) {
 
 // GetProviderVolumeID converts aws://eu-central-1b/vol-00f93d4827217c629 to vol-00f93d4827217c629 for EBS volumes
 func (r *EBSVolumeResizer) GetProviderVolumeID(pv *v1.PersistentVolume) (string, error) {
-	volumeID := pv.Spec.AWSElasticBlockStore.VolumeID
+	var volumeID string = ""
+	if pv.Spec.CSI != nil {
+		volumeID = pv.Spec.CSI.VolumeHandle
+	} else if pv.Spec.AWSElasticBlockStore != nil {
+		volumeID = pv.Spec.AWSElasticBlockStore.VolumeID
+	}
 	if volumeID == "" {
 		return "", fmt.Errorf("got empty volume id for volume %v", pv)
 	}

pkg/util/volumes/ebs_test.go

@@ -0,0 +1,123 @@
+package volumes
+
+import (
+	"fmt"
+	"testing"
+	v1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+func TestGetProviderVolumeID(t *testing.T) {
+	tests := []struct {
+		name     string
+		pv       *v1.PersistentVolume
+		expected string
+		err      error
+	}{
+		{
+			name: "CSI volume handle",
+			pv: &v1.PersistentVolume{
+				Spec: v1.PersistentVolumeSpec{
+					PersistentVolumeSource: v1.PersistentVolumeSource{
+						CSI: &v1.CSIPersistentVolumeSource{
+							VolumeHandle: "vol-075ddfc4a127d0bd5",
+						},
+					},
+				},
+			},
+			expected: "vol-075ddfc4a127d0bd5",
+			err:      nil,
+		},
+		{
+			name: "AWS EBS volume handle",
+			pv: &v1.PersistentVolume{
+				Spec: v1.PersistentVolumeSpec{
+					PersistentVolumeSource: v1.PersistentVolumeSource{
+						AWSElasticBlockStore: &v1.AWSElasticBlockStoreVolumeSource{
+							VolumeID: "aws://eu-central-1a/vol-075ddfc4a127d0bd4",
+						},
+					},
+				},
+			},
+			expected: "vol-075ddfc4a127d0bd4",
+			err:      nil,
+		},
+		{
+			name: "Empty volume handle",
+			pv: &v1.PersistentVolume{
+				Spec: v1.PersistentVolumeSpec{},
+			},
+			expected: "",
+			err:      fmt.Errorf("got empty volume id for volume %v", &v1.PersistentVolume{}),
+		},
+	}
+
+	resizer := EBSVolumeResizer{}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			volumeID, err := resizer.GetProviderVolumeID(tt.pv)
+			if volumeID != tt.expected || (err != nil && err.Error() != tt.err.Error()) {
+				t.Errorf("expected %v, got %v, expected err %v, got %v", tt.expected, volumeID, tt.err, err)
+			}
+		})
+	}
+}
+
+func TestVolumeBelongsToProvider(t *testing.T) {
+	tests := []struct {
+		name     string
+		pv       *v1.PersistentVolume
+		expected bool
+	}{
+		{
+			name: "CSI volume handle",
+			pv: &v1.PersistentVolume{
+				Spec: v1.PersistentVolumeSpec{
+					PersistentVolumeSource: v1.PersistentVolumeSource{
+						CSI: &v1.CSIPersistentVolumeSource{
+							Driver:       "ebs.csi.aws.com",
+							VolumeHandle: "vol-075ddfc4a127d0bd5",
+						},
+					},
+				},
+			},
+			expected: true,
+		},
+		{
+			name: "AWS EBS volume handle",
+			pv: &v1.PersistentVolume{
+				ObjectMeta: metav1.ObjectMeta{
+					Annotations: map[string]string {
+						"pv.kubernetes.io/provisioned-by": "kubernetes.io/aws-ebs",
+					},
+				},
+				Spec: v1.PersistentVolumeSpec{
+					PersistentVolumeSource: v1.PersistentVolumeSource{
+						AWSElasticBlockStore: &v1.AWSElasticBlockStoreVolumeSource{
+							VolumeID: "aws://eu-central-1a/vol-075ddfc4a127d0bd4",
+						},
+					},
+				},
+			},
+			expected: true,
+		},
+		{
+			name: "Empty volume source",
+			pv: &v1.PersistentVolume{
+				Spec: v1.PersistentVolumeSpec{},
+			},
+			expected: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			resizer := EBSVolumeResizer{}
+			isProvider := resizer.VolumeBelongsToProvider(tt.pv)
+			if isProvider != tt.expected {
+				t.Errorf("expected %v, got %v", tt.expected, isProvider)
+			}
+		})
+	}
+}