rbd: add Volume interface

The Volume interface will make it easier to work with the rbdImage
struct, as the functions are cleaner defined. This benefits work that is
needed for VolumeGroups and other CSI-Addons procedures.

Signed-off-by: Niels de Vos <ndevos@ibm.com>

internal/rbd/rbd_util.go

@@ -28,6 +28,7 @@ import (
 	"strings"
 	"time"
 
+	types "github.com/ceph/ceph-csi/internal/rbd_types"
 	"github.com/ceph/ceph-csi/internal/util"
 	"github.com/ceph/ceph-csi/internal/util/log"
 
@@ -150,6 +151,9 @@ type rbdImage struct {
 	ParentInTrash bool
 }
 
+// check that rbdVolume implements the types.Volume interface.
+var _ types.Volume = rbdVolume{}
+
 // rbdVolume represents a CSI volume and its RBD image specifics.
 type rbdVolume struct {
 	rbdImage
@@ -418,6 +422,11 @@ func (rs *rbdSnapshot) String() string {
 	return fmt.Sprintf("%s/%s@%s", rs.Pool, rs.RbdImageName, rs.RbdSnapName)
 }
 
+// GetID returns the CSI volume handle of the image.
+func (ri *rbdImage) GetID(ctx context.Context) (string, error) {
+	return ri.VolID, nil
+}
+
 // createImage creates a new ceph image with provision and volume options.
 func createImage(ctx context.Context, pOpts *rbdVolume, cr *util.Credentials) error {
 	volSzMiB := fmt.Sprintf("%dM", util.RoundOffVolSize(pOpts.VolSize))

internal/rbd_types/volume.go

@@ -0,0 +1,31 @@
+/*
+Copyright 2024 The Ceph-CSI Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+//nolint:golint // this package should be renamed to rbd/types
+package rbd_types
+
+import (
+	"context"
+)
+
+type Volume interface {
+	// Destroy frees the resources used by the Volume.
+	Destroy(ctx context.Context)
+
+	Delete(ctx context.Context) error
+
+	GetID(ctx context.Context) (string, error)
+}