feat: allow no migration of commitment

store/v2/commitment/store.go

@@ -380,7 +380,7 @@ func (c *CommitStore) Restore(version uint64, format uint32, protoReader protoio
 	var (
 		importer     Importer
 		snapshotItem snapshotstypes.SnapshotItem
-		storeKey     string
+		storeKey     []byte
 	)
 
 loop:
@@ -402,10 +402,10 @@ loop:
 				importer.Close()
 			}
 
-			storeKey = item.Store.Name
+			storeKey = []byte(item.Store.Name)
 			tree := c.multiTrees[item.Store.Name]
 			if tree == nil {
-				return snapshotstypes.SnapshotItem{}, fmt.Errorf("store %s not found", storeKey)
+				return snapshotstypes.SnapshotItem{}, fmt.Errorf("store %s not found", item.Store.Name)
 			}
 			importer, err = tree.Import(version)
 			if err != nil {
@@ -432,15 +432,13 @@ loop:
 					node.Value = []byte{}
 				}
 
-				key := []byte(storeKey)
 				// If the node is a leaf node, it will be written to the storage.
 				chStorage <- &corestore.StateChanges{
-					Actor: key,
+					Actor: storeKey,
 					StateChanges: []corestore.KVPair{
 						{
-							Key:    node.Key,
-							Value:  node.Value,
-							Remove: false,
+							Key:   node.Key,
+							Value: node.Value,
 						},
 					},
 				}

store/v2/migration/manager.go

@@ -2,7 +2,9 @@ package migration
 
 import (
 	"encoding/binary"
+	"errors"
 	"fmt"
+	"io"
 	"sync"
 	"time"
 
@@ -14,6 +16,7 @@ import (
 	"cosmossdk.io/store/v2/commitment"
 	"cosmossdk.io/store/v2/internal/encoding"
 	"cosmossdk.io/store/v2/snapshots"
+	snapshotstypes "cosmossdk.io/store/v2/snapshots/types"
 	"cosmossdk.io/store/v2/storage"
 )
 
@@ -49,6 +52,8 @@ type Manager struct {
 }
 
 // NewManager returns a new Manager.
+//
+// NOTE: `sc` can be `nil` if don't want to migrate the commitment.
 func NewManager(db store.RawDB, sm *snapshots.Manager, ss *storage.StorageStore, sc *commitment.CommitStore, logger log.Logger) *Manager {
 	return &Manager{
 		logger:           logger,
@@ -106,8 +111,51 @@ func (m *Manager) Migrate(height uint64) error {
 	})
 	eg.Go(func() error {
 		defer close(chStorage)
-		_, err := m.stateCommitment.Restore(height, 0, ms, chStorage)
-		return err
+		if m.stateCommitment != nil {
+			if _, err := m.stateCommitment.Restore(height, 0, ms, chStorage); err != nil {
+				return err
+			}
+		} else { // there is no commitment migration, just consume the stream to restore the state storage
+			var storeKey []byte
+		loop:
+			for {
+				snapshotItem := snapshotstypes.SnapshotItem{}
+				err := ms.ReadMsg(&snapshotItem)
+				if errors.Is(err, io.EOF) {
+					break
+				}
+				if err != nil {
+					return fmt.Errorf("failed to read snapshot item: %w", err)
+				}
+				switch item := snapshotItem.Item.(type) {
+				case *snapshotstypes.SnapshotItem_Store:
+					storeKey = []byte(item.Store.Name)
+				case *snapshotstypes.SnapshotItem_IAVL:
+					if item.IAVL.Height == 0 { // only restore the leaf nodes
+						key := item.IAVL.Key
+						if key == nil {
+							key = []byte{}
+						}
+						value := item.IAVL.Value
+						if value == nil {
+							value = []byte{}
+						}
+						chStorage <- &corestore.StateChanges{
+							Actor: storeKey,
+							StateChanges: []corestore.KVPair{
+								{
+									Key:   key,
+									Value: value,
+								},
+							},
+						}
+					}
+				default:
+					break loop
+				}
+			}
+		}
+		return nil
 	})
 
 	if err := eg.Wait(); err != nil {
@@ -186,12 +234,13 @@ func (m *Manager) Sync() error {
 			if err := encoding.UnmarshalChangeset(cs, csBytes); err != nil {
 				return fmt.Errorf("failed to unmarshal changeset: %w", err)
 			}
-
-			if err := m.stateCommitment.WriteBatch(cs); err != nil {
-				return fmt.Errorf("failed to write changeset to commitment: %w", err)
-			}
-			if _, err := m.stateCommitment.Commit(version); err != nil {
-				return fmt.Errorf("failed to commit changeset to commitment: %w", err)
+			if m.stateCommitment != nil {
+				if err := m.stateCommitment.WriteBatch(cs); err != nil {
+					return fmt.Errorf("failed to write changeset to commitment: %w", err)
+				}
+				if _, err := m.stateCommitment.Commit(version); err != nil {
+					return fmt.Errorf("failed to commit changeset to commitment: %w", err)
+				}
 			}
 			if err := m.stateStorage.ApplyChangeset(version, cs); err != nil {
 				return fmt.Errorf("failed to write changeset to storage: %w", err)
@@ -212,7 +261,9 @@ func (m *Manager) Close() error {
 	if err := m.db.Close(); err != nil {
 		return fmt.Errorf("failed to close db: %w", err)
 	}
-	m.snapshotsManager.EndMigration(m.stateCommitment)
+	if m.stateCommitment != nil {
+		m.snapshotsManager.EndMigration(m.stateCommitment)
+	}
 
 	return nil
 }

store/v2/migration/manager_test.go

@@ -18,7 +18,7 @@ import (
 
 var storeKeys = []string{"store1", "store2"}
 
-func setupMigrationManager(t *testing.T) (*Manager, *commitment.CommitStore) {
+func setupMigrationManager(t *testing.T, noCommitStore bool) (*Manager, *commitment.CommitStore) {
 	t.Helper()
 
 	db := dbm.NewMemDB()
@@ -49,57 +49,66 @@ func setupMigrationManager(t *testing.T) (*Manager, *commitment.CommitStore) {
 
 	newCommitStore, err := commitment.NewCommitStore(multiTrees1, db1, nil, log.NewNopLogger()) // for store/v2
 	require.NoError(t, err)
+	if noCommitStore {
+		newCommitStore = nil
+	}
 
 	return NewManager(db, snapshotsManager, newStorageStore, newCommitStore, log.NewNopLogger()), commitStore
 }
 
 func TestMigrateState(t *testing.T) {
-	m, orgCommitStore := setupMigrationManager(t)
-
-	// apply changeset
-	toVersion := uint64(100)
-	keyCount := 10
-	for version := uint64(1); version <= toVersion; version++ {
-		cs := corestore.NewChangeset()
-		for _, storeKey := range storeKeys {
-			for i := 0; i < keyCount; i++ {
-				cs.Add([]byte(storeKey), []byte(fmt.Sprintf("key-%d-%d", version, i)), []byte(fmt.Sprintf("value-%d-%d", version, i)), false)
+	for _, noCommitStore := range []bool{false, true} {
+		t.Run(fmt.Sprintf("Migrate noCommitStore=%v", noCommitStore), func(t *testing.T) {
+			m, orgCommitStore := setupMigrationManager(t, noCommitStore)
+
+			// apply changeset
+			toVersion := uint64(100)
+			keyCount := 10
+			for version := uint64(1); version <= toVersion; version++ {
+				cs := corestore.NewChangeset()
+				for _, storeKey := range storeKeys {
+					for i := 0; i < keyCount; i++ {
+						cs.Add([]byte(storeKey), []byte(fmt.Sprintf("key-%d-%d", version, i)), []byte(fmt.Sprintf("value-%d-%d", version, i)), false)
+					}
+				}
+				require.NoError(t, orgCommitStore.WriteBatch(cs))
+				_, err := orgCommitStore.Commit(version)
+				require.NoError(t, err)
 			}
-		}
-		require.NoError(t, orgCommitStore.WriteBatch(cs))
-		_, err := orgCommitStore.Commit(version)
-		require.NoError(t, err)
-	}
-
-	err := m.Migrate(toVersion - 1)
-	require.NoError(t, err)
 
-	// check the migrated state
-	for version := uint64(1); version < toVersion; version++ {
-		for _, storeKey := range storeKeys {
-			for i := 0; i < keyCount; i++ {
-				val, err := m.stateCommitment.Get([]byte(storeKey), toVersion-1, []byte(fmt.Sprintf("key-%d-%d", version, i)))
+			err := m.Migrate(toVersion - 1)
+			require.NoError(t, err)
+
+			if m.stateCommitment != nil {
+				// check the migrated state
+				for version := uint64(1); version < toVersion; version++ {
+					for _, storeKey := range storeKeys {
+						for i := 0; i < keyCount; i++ {
+							val, err := m.stateCommitment.Get([]byte(storeKey), toVersion-1, []byte(fmt.Sprintf("key-%d-%d", version, i)))
+							require.NoError(t, err)
+							require.Equal(t, []byte(fmt.Sprintf("value-%d-%d", version, i)), val)
+						}
+					}
+				}
+				// check the latest state
+				val, err := m.stateCommitment.Get([]byte("store1"), toVersion-1, []byte("key-100-1"))
 				require.NoError(t, err)
-				require.Equal(t, []byte(fmt.Sprintf("value-%d-%d", version, i)), val)
+				require.Nil(t, val)
+				val, err = m.stateCommitment.Get([]byte("store2"), toVersion-1, []byte("key-100-0"))
+				require.NoError(t, err)
+				require.Nil(t, val)
 			}
-		}
-	}
-	// check the latest state
-	val, err := m.stateCommitment.Get([]byte("store1"), toVersion-1, []byte("key-100-1"))
-	require.NoError(t, err)
-	require.Nil(t, val)
-	val, err = m.stateCommitment.Get([]byte("store2"), toVersion-1, []byte("key-100-0"))
-	require.NoError(t, err)
-	require.Nil(t, val)
 
-	// check the storage
-	for version := uint64(1); version < toVersion; version++ {
-		for _, storeKey := range storeKeys {
-			for i := 0; i < keyCount; i++ {
-				val, err := m.stateStorage.Get([]byte(storeKey), toVersion-1, []byte(fmt.Sprintf("key-%d-%d", version, i)))
-				require.NoError(t, err)
-				require.Equal(t, []byte(fmt.Sprintf("value-%d-%d", version, i)), val)
+			// check the storage
+			for version := uint64(1); version < toVersion; version++ {
+				for _, storeKey := range storeKeys {
+					for i := 0; i < keyCount; i++ {
+						val, err := m.stateStorage.Get([]byte(storeKey), toVersion-1, []byte(fmt.Sprintf("key-%d-%d", version, i)))
+						require.NoError(t, err)
+						require.Equal(t, []byte(fmt.Sprintf("value-%d-%d", version, i)), val)
+					}
+				}
 			}
-		}
+		})
 	}
 }

store/v2/root/store.go

@@ -395,7 +395,10 @@ func (s *Store) writeSC(cs *corestore.Changeset) error {
 			if err := s.stateCommitment.Close(); err != nil {
 				return fmt.Errorf("failed to close the old SC store: %w", err)
 			}
-			s.stateCommitment = s.migrationManager.GetStateCommitment()
+			newStateCommitment := s.migrationManager.GetStateCommitment()
+			if newStateCommitment != nil {
+				s.stateCommitment = newStateCommitment
+			}
 			if err := s.migrationManager.Close(); err != nil {
 				return fmt.Errorf("failed to close migration manager: %w", err)
 			}