Problem: no command to fix corrupted data in versiondb

CHANGELOG.md

@@ -5,6 +5,7 @@
 ### Bug Fixes
 
 * [#1679](https://github.com/crypto-org-chain/cronos/pull/1679) Include no trace detail on insufficient balance fix.
+* [#1685](https://github.com/crypto-org-chain/cronos/pull/1685) Fix versiondb corrupted data on startup.
 
 ### Improvements
 

app/versiondb.go

@@ -24,16 +24,20 @@ func (app *App) setupVersionDB(
 		return nil, err
 	}
 
-	versionDB, err := tsrocksdb.NewStore(dataDir)
-	if err != nil {
-		return nil, err
-	}
-
 	// always listen for all keys to simplify configuration
 	exposedKeys := make([]storetypes.StoreKey, 0, len(keys))
 	for _, key := range keys {
 		exposedKeys = append(exposedKeys, key)
 	}
+
+	versionDB, err := tsrocksdb.NewStore(dataDir)
+	if err != nil {
+		return nil, err
+	}
+
+	// see: https://github.com/crypto-org-chain/cronos/issues/1683
+	versionDB.SetSkipVersionZero(true)
+
 	app.CommitMultiStore().AddListeners(exposedKeys)
 
 	// register in app streaming manager

versiondb/client/cmd.go

@@ -28,6 +28,7 @@ func ChangeSetGroupCmd(opts Options) *cobra.Command {
 		ChangeSetToVersionDBCmd(),
 		RestoreAppDBCmd(opts),
 		RestoreVersionDBCmd(),
+		FixDataCmd(opts.DefaultStores),
 	)
 	return cmd
 }

versiondb/client/fixdata.go

@@ -0,0 +1,29 @@
+package client
+
+import (
+	"github.com/crypto-org-chain/cronos/versiondb/tsrocksdb"
+	"github.com/spf13/cobra"
+)
+
+func FixDataCmd(stores []string) *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "fixdata",
+		Args:  cobra.ExactArgs(1),
+		Short: "Fix wrong data in versiondb, see: https://github.com/crypto-org-chain/cronos/issues/1683",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			dir := args[0]
+			versionDB, err := tsrocksdb.NewStore(dir)
+			if err != nil {
+				return err
+			}
+
+			// see: https://github.com/crypto-org-chain/cronos/issues/1683
+			if err := versionDB.FixData(stores); err != nil {
+				return err
+			}
+
+			return nil
+		},
+	}
+	return cmd
+}

versiondb/tsrocksdb/iterator.go

@@ -2,6 +2,7 @@ package tsrocksdb
 
 import (
 	"bytes"
+	"encoding/binary"
 
 	"cosmossdk.io/store/types"
 	"github.com/linxGnu/grocksdb"
@@ -12,11 +13,14 @@ type rocksDBIterator struct {
 	prefix, start, end []byte
 	isReverse          bool
 	isInvalid          bool
+
+	// see: https://github.com/crypto-org-chain/cronos/issues/1683
+	skipVersionZero bool
 }
 
 var _ types.Iterator = (*rocksDBIterator)(nil)
 
-func newRocksDBIterator(source *grocksdb.Iterator, prefix, start, end []byte, isReverse bool) *rocksDBIterator {
+func newRocksDBIterator(source *grocksdb.Iterator, prefix, start, end []byte, isReverse bool, skipVersionZero bool) *rocksDBIterator {
 	if isReverse {
 		if end == nil {
 			source.SeekToLast()
@@ -39,14 +43,18 @@ func newRocksDBIterator(source *grocksdb.Iterator, prefix, start, end []byte, is
 			source.Seek(start)
 		}
 	}
-	return &rocksDBIterator{
-		source:    source,
-		prefix:    prefix,
-		start:     start,
-		end:       end,
-		isReverse: isReverse,
-		isInvalid: false,
+	it := &rocksDBIterator{
+		source:          source,
+		prefix:          prefix,
+		start:           start,
+		end:             end,
+		isReverse:       isReverse,
+		isInvalid:       false,
+		skipVersionZero: skipVersionZero,
 	}
+
+	it.trySkipNonZeroVersion()
+	return it
 }
 
 // Domain implements Iterator.
@@ -114,6 +122,22 @@ func (itr rocksDBIterator) Next() {
 	} else {
 		itr.source.Next()
 	}
+
+	itr.trySkipNonZeroVersion()
+}
+
+func (itr rocksDBIterator) timestamp() uint64 {
+	ts := itr.source.Timestamp()
+	defer ts.Free()
+	return binary.LittleEndian.Uint64(ts.Data())
+}
+
+func (itr rocksDBIterator) trySkipNonZeroVersion() {
+	if itr.skipVersionZero {
+		for itr.Valid() && itr.timestamp() == 0 {
+			itr.Next()
+		}
+	}
 }
 
 // Error implements Iterator.
@@ -137,6 +161,10 @@ func (itr *rocksDBIterator) assertIsValid() {
 // This function can be applied on *Slice returned from Key() and Value()
 // of an Iterator, because they are marked as freed.
 func moveSliceToBytes(s *grocksdb.Slice) []byte {
+	if s == nil {
+		return nil
+	}
+
 	defer s.Free()
 	if !s.Exists() {
 		return nil

versiondb/tsrocksdb/store.go

@@ -1,6 +1,7 @@
 package tsrocksdb
 
 import (
+	"bytes"
 	"encoding/binary"
 	"errors"
 	"fmt"
@@ -38,6 +39,9 @@ func init() {
 type Store struct {
 	db       *grocksdb.DB
 	cfHandle *grocksdb.ColumnFamilyHandle
+
+	// see: https://github.com/crypto-org-chain/cronos/issues/1683
+	skipVersionZero bool
 }
 
 func NewStore(dir string) (Store, error) {
@@ -58,6 +62,10 @@ func NewStoreWithDB(db *grocksdb.DB, cfHandle *grocksdb.ColumnFamilyHandle) Stor
 	}
 }
 
+func (s *Store) SetSkipVersionZero(skip bool) {
+	s.skipVersionZero = skip
+}
+
 func (s Store) SetLatestVersion(version int64) error {
 	var ts [TimestampSize]byte
 	binary.LittleEndian.PutUint64(ts[:], uint64(version))
@@ -86,11 +94,23 @@ func (s Store) PutAtVersion(version int64, changeSet []*types.StoreKVPair) error
 }
 
 func (s Store) GetAtVersionSlice(storeKey string, key []byte, version *int64) (*grocksdb.Slice, error) {
-	return s.db.GetCF(
+	value, ts, err := s.db.GetCFWithTS(
 		newTSReadOptions(version),
 		s.cfHandle,
 		prependStoreKey(storeKey, key),
 	)
+	if err != nil {
+		return nil, err
+	}
+	defer ts.Free()
+
+	if value.Exists() && s.skipVersionZero {
+		if binary.LittleEndian.Uint64(ts.Data()) == 0 {
+			return nil, nil
+		}
+	}
+
+	return value, err
 }
 
 // GetAtVersion implements VersionStore interface
@@ -128,28 +148,24 @@ func (s Store) GetLatestVersion() (int64, error) {
 
 // IteratorAtVersion implements VersionStore interface
 func (s Store) IteratorAtVersion(storeKey string, start, end []byte, version *int64) (types.Iterator, error) {
-	if (start != nil && len(start) == 0) || (end != nil && len(end) == 0) {
-		return nil, errKeyEmpty
-	}
-
-	prefix := storePrefix(storeKey)
-	start, end = iterateWithPrefix(prefix, start, end)
-
-	itr := s.db.NewIteratorCF(newTSReadOptions(version), s.cfHandle)
-	return newRocksDBIterator(itr, prefix, start, end, false), nil
+	return s.iteratorAtVersion(storeKey, start, end, version, false)
 }
 
 // ReverseIteratorAtVersion implements VersionStore interface
 func (s Store) ReverseIteratorAtVersion(storeKey string, start, end []byte, version *int64) (types.Iterator, error) {
+	return s.iteratorAtVersion(storeKey, start, end, version, true)
+}
+
+func (s Store) iteratorAtVersion(storeKey string, start, end []byte, version *int64, reverse bool) (types.Iterator, error) {
 	if (start != nil && len(start) == 0) || (end != nil && len(end) == 0) {
 		return nil, errKeyEmpty
 	}
 
 	prefix := storePrefix(storeKey)
-	start, end = iterateWithPrefix(storePrefix(storeKey), start, end)
+	start, end = iterateWithPrefix(prefix, start, end)
 
 	itr := s.db.NewIteratorCF(newTSReadOptions(version), s.cfHandle)
-	return newRocksDBIterator(itr, prefix, start, end, true), nil
+	return newRocksDBIterator(itr, prefix, start, end, reverse, s.skipVersionZero), nil
 }
 
 // FeedChangeSet is used to migrate legacy change sets into versiondb
@@ -216,6 +232,63 @@ func (s Store) Flush() error {
 	)
 }
 
+// FixData fixes wrong data written in versiondb due to rocksdb upgrade, the operation is idempotent.
+// see: https://github.com/crypto-org-chain/cronos/issues/1683
+// call this before `SetSkipVersionZero(true)`.
+func (s Store) FixData(storeNames []string) error {
+	for _, storeName := range storeNames {
+		if err := s.fixDataStore(storeName); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// fixDataStore iterate the wrong data at version 0, parse the timestamp from the key and write it again.
+func (s Store) fixDataStore(storeName string) error {
+	var version int64
+	iter, err := s.IteratorAtVersion(storeName, nil, nil, &version)
+	if err != nil {
+		return err
+	}
+	defer iter.Close()
+
+	batch := grocksdb.NewWriteBatch()
+	defer batch.Destroy()
+
+	prefix := storePrefix(storeName)
+	for ; iter.Valid(); iter.Next() {
+		key := iter.Key()
+		if len(key) < TimestampSize {
+			return fmt.Errorf("invalid key length: %X", key)
+		}
+
+		ts := key[len(key)-TimestampSize:]
+		key = key[:len(key)-TimestampSize]
+		realKey := cloneAppend(prefix, key)
+
+		readOpts := grocksdb.NewDefaultReadOptions()
+		readOpts.SetTimestamp(ts)
+		oldValue, err := s.db.GetCF(readOpts, s.cfHandle, realKey)
+		if err != nil {
+			return err
+		}
+		readOpts.Destroy()
+
+		clean := bytes.Equal(oldValue.Data(), iter.Value())
+		oldValue.Free()
+
+		if clean {
+			continue
+		}
+
+		batch.PutCFWithTS(s.cfHandle, realKey, ts, iter.Value())
+	}
+
+	return s.db.Write(defaultSyncWriteOpts, batch)
+}
+
 func newTSReadOptions(version *int64) *grocksdb.ReadOptions {
 	var ver uint64
 	if version == nil {