Add support for Fast Snapshot Restores

Signed-off-by: Eddie Torres <[email protected]>

docs/fast-snapshot-restores.md

@@ -0,0 +1,39 @@
+# Fast Snapshot Restores
+
+The EBS CSI Driver provides support for [Fast Snapshot Restores(FSR)](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-fast-snapshot-restore.html) via `VolumeSnapshotClass.parameters.fastSnapshotRestoreAvailabilityZones`.
+
+Amazon EBS fast snapshot restore (FSR) enables you to create a volume from a snapshot that is fully initialized at creation. This eliminates the latency of I/O operations on a block when it is accessed for the first time. Volumes that are created using fast snapshot restore instantly deliver all of their provisioned performance.
+
+Availability zones are specified as a comma separated list.
+
+**Example**
+```
+apiVersion: snapshot.storage.k8s.io/v1
+kind: VolumeSnapshotClass
+metadata:
+  name: csi-aws-vsc
+driver: ebs.csi.aws.com
+deletionPolicy: Delete
+parameters:
+  fastSnapshotRestoreAvailabilityZones: "us-east-1a, us-east-1b"
+```
+
+## Prerequisites
+
+- Install the [Kubernetes Volume Snapshot CRDs](https://github.com/kubernetes-csi/external-snapshotter/tree/master/client/config/crd) and external-snapshotter sidecar. For installation instructions, see [CSI Snapshotter Usage](https://github.com/kubernetes-csi/external-snapshotter#usage).
+
+- The EBS CSI Driver must be given permission to access the [`EnableFastSnapshotRestores` EC2 API](https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_EnableFastSnapshotRestores.html). This example snippet can be used in an IAM policy to grant access to `EnableFastSnapshotRestores`:
+
+```json
+{
+  "Effect": "Allow",
+  "Action": [
+    "ec2:EnableFastSnapshotRestores"
+  ],
+  "Resource": "*"
+}
+```
+
+## Failure Mode
+
+The driver will attempt to check if the availability zones provided are supported for fast snapshot restore before attempting to create the snapshot. If the `EnableFastSnapshotRestores` API call fails, the driver will hard-fail the request and delete the snapshot. This is to ensure that the snapshot is not left in an inconsistent state.

pkg/cloud/cloud.go

@@ -874,6 +874,24 @@ func (c *cloud) ec2SnapshotResponseToStruct(ec2Snapshot *ec2.Snapshot) *Snapshot
 	return snapshot
 }
 
+func (c *cloud) EnableFastSnapshotRestores(ctx context.Context, availabilityZones []string, snapshotID string) (*ec2.EnableFastSnapshotRestoresOutput, error) {
+	request := &ec2.EnableFastSnapshotRestoresInput{
+		AvailabilityZones: aws.StringSlice(availabilityZones),
+		SourceSnapshotIds: []*string{
+			aws.String(snapshotID),
+		},
+	}
+	klog.V(4).InfoS("Creating Fast Snapshot Restores", "snapshotID", snapshotID, "availabilityZones", availabilityZones)
+	response, err := c.ec2.EnableFastSnapshotRestoresWithContext(ctx, request)
+	if err != nil {
+		return nil, err
+	}
+	if len(response.Unsuccessful) > 0 {
+		return response, fmt.Errorf("failed to create fast snapshot restores for snapshot %s: %v", snapshotID, response.Unsuccessful)
+	}
+	return response, nil
+}
+
 func (c *cloud) getVolume(ctx context.Context, request *ec2.DescribeVolumesInput) (*ec2.Volume, error) {
 	var volumes []*ec2.Volume
 	var nextToken *string
@@ -1236,6 +1254,19 @@ func (c *cloud) randomAvailabilityZone(ctx context.Context) (string, error) {
 	return zones[0], nil
 }
 
+// AvailabilityZones returns availability zones from the given region
+func (c *cloud) AvailabilityZones(ctx context.Context) (map[string]struct{}, error) {
+	response, err := c.ec2.DescribeAvailabilityZonesWithContext(ctx, &ec2.DescribeAvailabilityZonesInput{})
+	if err != nil {
+		return nil, fmt.Errorf("error describing availability zones: %w", err)
+	}
+	zones := make(map[string]struct{})
+	for _, zone := range response.AvailabilityZones {
+		zones[*zone.ZoneName] = struct{}{}
+	}
+	return zones, nil
+}
+
 func volumeModificationDone(state string) bool {
 	if state == ec2.VolumeModificationStateCompleted || state == ec2.VolumeModificationStateOptimizing {
 		return true

pkg/cloud/cloud_interface.go

@@ -21,4 +21,6 @@ type Cloud interface {
 	GetSnapshotByName(ctx context.Context, name string) (snapshot *Snapshot, err error)
 	GetSnapshotByID(ctx context.Context, snapshotID string) (snapshot *Snapshot, err error)
 	ListSnapshots(ctx context.Context, volumeID string, maxResults int64, nextToken string) (listSnapshotsResponse *ListSnapshotsResponse, err error)
+	EnableFastSnapshotRestores(ctx context.Context, availabilityZones []string, snapshotID string) (*ec2.EnableFastSnapshotRestoresOutput, error)
+	AvailabilityZones(ctx context.Context) (map[string]struct{}, error)
 }

pkg/cloud/cloud_test.go

@@ -1061,6 +1061,139 @@ func TestCreateSnapshot(t *testing.T) {
 	}
 }
 
+func TestEnableFastSnapshotRestores(t *testing.T) {
+	testCases := []struct {
+		name              string
+		snapshotID        string
+		availabilityZones []string
+		expOutput         *ec2.EnableFastSnapshotRestoresOutput
+		expErr            error
+	}{
+		{
+			name:              "success: normal",
+			snapshotID:        "snap-test-id",
+			availabilityZones: []string{"us-west-2a", "us-west-2b"},
+			expOutput: &ec2.EnableFastSnapshotRestoresOutput{
+				Successful: []*ec2.EnableFastSnapshotRestoreSuccessItem{{
+					AvailabilityZone: aws.String("us-west-2a,us-west-2b"),
+					SnapshotId:       aws.String("snap-test-id")}},
+				Unsuccessful: []*ec2.EnableFastSnapshotRestoreErrorItem{},
+			},
+			expErr: nil,
+		},
+		{
+			name:              "fail: unsuccessful response",
+			snapshotID:        "snap-test-id",
+			availabilityZones: []string{"us-west-2a", "invalid-zone"},
+			expOutput: &ec2.EnableFastSnapshotRestoresOutput{
+				Unsuccessful: []*ec2.EnableFastSnapshotRestoreErrorItem{{
+					SnapshotId: aws.String("snap-test-id"),
+					FastSnapshotRestoreStateErrors: []*ec2.EnableFastSnapshotRestoreStateErrorItem{
+						{AvailabilityZone: aws.String("us-west-2a,invalid-zone"),
+							Error: &ec2.EnableFastSnapshotRestoreStateError{
+								Message: aws.String("failed to create fast snapshot restore")}},
+					},
+				}},
+			},
+			expErr: nil,
+		},
+		{
+			name:              "fail: error",
+			snapshotID:        "",
+			availabilityZones: nil,
+			expOutput:         nil,
+			expErr:            fmt.Errorf("EnableFastSnapshotRestores error"),
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			mockCtrl := gomock.NewController(t)
+			mockEC2 := NewMockEC2(mockCtrl)
+			c := newCloud(mockEC2)
+
+			ctx := context.Background()
+			mockEC2.EXPECT().EnableFastSnapshotRestoresWithContext(gomock.Eq(ctx), gomock.Any()).Return(tc.expOutput, tc.expErr).AnyTimes()
+
+			response, err := c.EnableFastSnapshotRestores(ctx, tc.availabilityZones, tc.snapshotID)
+
+			if err != nil {
+				if tc.expErr == nil && len(tc.expOutput.Unsuccessful) == 0 {
+					t.Fatalf("EnableFastSnapshotRestores() failed: expected no error, got: %v", err)
+				}
+			} else {
+				if tc.expErr != nil {
+					t.Fatalf("EnableFastSnapshotRestores() failed: expected error, got nothing")
+				}
+				if len(response.Successful) == 0 || len(response.Unsuccessful) > 0 {
+					t.Fatalf("EnableFastSnapshotRestores() failed: expected successful response, got %v", response)
+				}
+				if *response.Successful[0].SnapshotId != tc.snapshotID {
+					t.Fatalf("EnableFastSnapshotRestores() failed: expected successful response to have SnapshotId %s, got %s", tc.snapshotID, *response.Successful[0].SnapshotId)
+				}
+				az := strings.Split(*response.Successful[0].AvailabilityZone, ",")
+				if !reflect.DeepEqual(az, tc.availabilityZones) {
+					t.Fatalf("EnableFastSnapshotRestores() failed: expected successful response to have AvailabilityZone %v, got %v", az, tc.availabilityZones)
+				}
+			}
+
+			mockCtrl.Finish()
+		})
+	}
+}
+
+func TestAvailabilityZones(t *testing.T) {
+	testCases := []struct {
+		name             string
+		availabilityZone string
+		expOutput        *ec2.DescribeAvailabilityZonesOutput
+		expErr           error
+	}{
+		{
+			name:             "success: normal",
+			availabilityZone: expZone,
+			expOutput: &ec2.DescribeAvailabilityZonesOutput{
+				AvailabilityZones: []*ec2.AvailabilityZone{
+					{ZoneName: aws.String(expZone)},
+				}},
+			expErr: nil,
+		},
+		{
+			name:             "fail: error",
+			availabilityZone: "",
+			expOutput:        nil,
+			expErr:           fmt.Errorf("TestAvailabilityZones error"),
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			mockCtrl := gomock.NewController(t)
+			mockEC2 := NewMockEC2(mockCtrl)
+			c := newCloud(mockEC2)
+
+			ctx := context.Background()
+			mockEC2.EXPECT().DescribeAvailabilityZonesWithContext(gomock.Eq(ctx), gomock.Any()).Return(tc.expOutput, tc.expErr).AnyTimes()
+
+			az, err := c.AvailabilityZones(ctx)
+			if err != nil {
+				if tc.expErr == nil {
+					t.Fatalf("AvailabilityZones() failed: expected no error, got: %v", err)
+				}
+			} else {
+				if tc.expErr != nil {
+					t.Fatalf("AvailabilityZones() failed: expected error, got nothing")
+				}
+				if val, ok := az[tc.availabilityZone]; !ok {
+					t.Fatalf("AvailabilityZones() failed: expected to find %s, got %v", tc.availabilityZone, val)
+				}
+			}
+
+			mockCtrl.Finish()
+		})
+	}
+}
+
 func TestDeleteSnapshot(t *testing.T) {
 	testCases := []struct {
 		name         string

pkg/cloud/ec2_interface.go

@@ -38,4 +38,5 @@ type EC2 interface {
 	DescribeVolumesModificationsWithContext(ctx aws.Context, input *ec2.DescribeVolumesModificationsInput, opts ...request.Option) (*ec2.DescribeVolumesModificationsOutput, error)
 	DescribeAvailabilityZonesWithContext(ctx aws.Context, input *ec2.DescribeAvailabilityZonesInput, opts ...request.Option) (*ec2.DescribeAvailabilityZonesOutput, error)
 	CreateTagsWithContext(ctx aws.Context, input *ec2.CreateTagsInput, opts ...request.Option) (*ec2.CreateTagsOutput, error)
+	EnableFastSnapshotRestoresWithContext(ctx aws.Context, input *ec2.EnableFastSnapshotRestoresInput, opts ...request.Option) (*ec2.EnableFastSnapshotRestoresOutput, error)
 }

pkg/driver/constants.go

@@ -80,6 +80,12 @@ const (
 	TagKeyPrefix = "tagSpecification"
 )
 
+// constants of keys in snapshot parameters
+const (
+	// FastSnapShotRestoreAvailabilityZones represents key for fast snapshot restore availability zones
+	FastSnapshotRestoreAvailabilityZones = "fastsnapshotrestoreavailabilityzones"
+)
+
 // constants for volume tags and their values
 const (
 	// ResourceLifecycleTagPrefix is prefix of tag for provisioned EBS volume that

pkg/driver/controller.go

@@ -605,11 +605,18 @@ func (d *controllerService) CreateSnapshot(ctx context.Context, req *csi.CreateS
 	}
 
 	var vscTags []string
+	var fsrAvailabilityZones []string
 	for key, value := range req.GetParameters() {
-		if strings.HasPrefix(key, TagKeyPrefix) {
-			vscTags = append(vscTags, value)
-		} else {
-			return nil, status.Errorf(codes.InvalidArgument, "Invalid parameter key %s for CreateSnapshot", key)
+		switch strings.ToLower(key) {
+		case FastSnapshotRestoreAvailabilityZones:
+			f := strings.ReplaceAll(value, " ", "")
+			fsrAvailabilityZones = strings.Split(f, ",")
+		default:
+			if strings.HasPrefix(key, TagKeyPrefix) {
+				vscTags = append(vscTags, value)
+			} else {
+				return nil, status.Errorf(codes.InvalidArgument, "Invalid parameter key %s for CreateSnapshot", key)
+			}
 		}
 	}
 
@@ -639,11 +646,35 @@ func (d *controllerService) CreateSnapshot(ctx context.Context, req *csi.CreateS
 		Tags: snapshotTags,
 	}
 
-	snapshot, err = d.cloud.CreateSnapshot(ctx, volumeID, opts)
+	// Check if the availability zone is supported for fast snapshot restore
+	if len(fsrAvailabilityZones) > 0 {
+		zones, error := d.cloud.AvailabilityZones(ctx)
+		klog.V(4).InfoS("Availability Zones", "zone", zones)
+		if error != nil {
+			klog.InfoS("failed to get availability zones", "err", error)
+		} else {
+			for _, az := range fsrAvailabilityZones {
+				if _, ok := zones[az]; !ok {
+					return nil, status.Errorf(codes.InvalidArgument, "availability zone %s is not supported for fast snapshot restore", az)
+				}
+			}
+		}
+	}
 
+	snapshot, err = d.cloud.CreateSnapshot(ctx, volumeID, opts)
 	if err != nil {
 		return nil, status.Errorf(codes.Internal, "Could not create snapshot %q: %v", snapshotName, err)
 	}
+
+	if len(fsrAvailabilityZones) > 0 {
+		_, err := d.cloud.EnableFastSnapshotRestores(ctx, fsrAvailabilityZones, snapshot.SnapshotID)
+		if err != nil {
+			if _, err = d.cloud.DeleteSnapshot(ctx, snapshot.SnapshotID); err != nil {
+				return nil, status.Errorf(codes.Internal, "Could not delete snapshot ID %q: %v", snapshotName, err)
+			}
+			return nil, status.Errorf(codes.Internal, "Failed to create Fast Snapshot Restores for snapshot ID %q: %v", snapshotName, err)
+		}
+	}
 	return newCreateSnapshotResponse(snapshot)
 }