add cbt interfaces

Signed-off-by: Lyndon-Li <lyonghui@vmware.com>

Author: Lyndon-Li

changelogs/unreleased/9716-Lyndon-Li

@@ -0,0 +1 @@
+Fix issue #9709, add interfaces for CBT service and CBT bitmap

pkg/cbtservice/service.go

@@ -0,0 +1,31 @@
+/*
+Copyright The Velero Contributors.
+
+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.
+*/
+
+package cbtservice
+
+import "context"
+
+type Record struct {
+	Offset int64
+	Length int64
+}
+
+type ChangeID string
+
+type Service interface {
+	GetAllocatedBlocks(ctx context.Context, changeId ChangeID, record func(Record) error) error
+	GetChangedBlocks(ctx context.Context, base ChangeID, target ChangeID, record func(Record) error) error
+}

pkg/uploader/cbt/bitmap.go

@@ -0,0 +1,30 @@
+/*
+Copyright The Velero Contributors.
+
+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.
+*/
+
+package cbt
+
+type Bitmap interface {
+	Set(int64, int64)
+	Iterator() Iterator
+}
+
+type Iterator interface {
+	SourceID() string
+	ChangeID() string
+	BlockSize() int
+	Count() uint64
+	Next() (int64, bool)
+}