fix: use the bottom layer's block instead

Signed-off-by: jsvisa <delweng@gmail.com>

triedb/pathdb/database.go

@@ -697,7 +697,7 @@ func (db *Database) SnapshotCompleted() bool {
 func (db *Database) FrezzerTailBlock() (uint64, error) {
 	freezer := db.stateFreezer
 	if freezer == nil {
-		return 0, errors.New("freezer is not available")
+		return db.tree.bottom().blockNumber(), nil
 	}
 
 	tailID, err := freezer.Tail()
@@ -705,9 +705,9 @@ func (db *Database) FrezzerTailBlock() (uint64, error) {
 		return 0, err
 	}
 
-	// No state has been persistent, return the genesis block number.
+	// No state has been persistent, get the block number from in-memory state.
 	if tailID == 0 {
-		return 0, nil
+		return db.tree.bottom().blockNumber(), nil
 	}
 
 	blob := rawdb.ReadStateHistoryMeta(freezer, tailID+1)

triedb/pathdb/disklayer.go

@@ -31,9 +31,10 @@ import (
 
 // diskLayer is a low level persistent layer built on top of a key-value store.
 type diskLayer struct {
-	root common.Hash // Immutable, root hash to which this layer was made for
-	id   uint64      // Immutable, corresponding state id
-	db   *Database   // Path-based trie database
+	root  common.Hash // Immutable, root hash to which this layer was made for
+	id    uint64      // Immutable, corresponding state id
+	block uint64      // Immutable, associated block number
+	db    *Database   // Path-based trie database
 
 	// These two caches must be maintained separately, because the key
 	// for the root node of the storage trie (accountHash) is identical
@@ -54,7 +55,7 @@ type diskLayer struct {
 }
 
 // newDiskLayer creates a new disk layer based on the passing arguments.
-func newDiskLayer(root common.Hash, id uint64, db *Database, nodes *fastcache.Cache, states *fastcache.Cache, buffer *buffer, frozen *buffer) *diskLayer {
+func newDiskLayer(root common.Hash, id uint64, block uint64, db *Database, nodes *fastcache.Cache, states *fastcache.Cache, buffer *buffer, frozen *buffer) *diskLayer {
 	// Initialize the clean caches if the memory allowance is not zero
 	// or reuse the provided caches if they are not nil (inherited from
 	// the original disk layer).
@@ -67,6 +68,7 @@ func newDiskLayer(root common.Hash, id uint64, db *Database, nodes *fastcache.Ca
 	return &diskLayer{
 		root:   root,
 		id:     id,
+		block:  block,
 		db:     db,
 		nodes:  nodes,
 		states: states,
@@ -85,6 +87,11 @@ func (dl *diskLayer) stateID() uint64 {
 	return dl.id
 }
 
+// blockNumber returns the associated block number of disk layer.
+func (dl *diskLayer) blockNumber() uint64 {
+	return dl.block
+}
+
 // parentLayer implements the layer interface, returning nil as there's no layer
 // below the disk.
 func (dl *diskLayer) parentLayer() layer {
@@ -471,7 +478,7 @@ func (dl *diskLayer) commit(bottom *diffLayer, force bool) (*diskLayer, error) {
 		combined = newBuffer(dl.db.config.WriteBufferSize, nil, nil, 0)
 	}
 	// Link the generator if snapshot is not yet completed
-	ndl := newDiskLayer(bottom.root, bottom.stateID(), dl.db, dl.nodes, dl.states, combined, dl.frozen)
+	ndl := newDiskLayer(bottom.root, bottom.stateID(), bottom.block, dl.db, dl.nodes, dl.states, combined, dl.frozen)
 	if dl.generator != nil {
 		ndl.setGenerator(dl.generator)
 	}
@@ -520,7 +527,7 @@ func (dl *diskLayer) revert(h *stateHistory) (*diskLayer, error) {
 		if err != nil {
 			return nil, err
 		}
-		ndl := newDiskLayer(h.meta.parent, dl.id-1, dl.db, dl.nodes, dl.states, dl.buffer, dl.frozen)
+		ndl := newDiskLayer(h.meta.parent, dl.id-1, h.meta.block-1, dl.db, dl.nodes, dl.states, dl.buffer, dl.frozen)
 
 		// Link the generator if it exists
 		if dl.generator != nil {
@@ -559,7 +566,7 @@ func (dl *diskLayer) revert(h *stateHistory) (*diskLayer, error) {
 	}
 	// Link the generator and resume generation if the snapshot is not yet
 	// fully completed.
-	ndl := newDiskLayer(h.meta.parent, dl.id-1, dl.db, dl.nodes, dl.states, dl.buffer, dl.frozen)
+	ndl := newDiskLayer(h.meta.parent, dl.id-1, h.meta.block-1, dl.db, dl.nodes, dl.states, dl.buffer, dl.frozen)
 	if dl.generator != nil && !dl.generator.completed() {
 		ndl.generator = dl.generator
 		ndl.generator.run(h.meta.parent)

triedb/pathdb/generate.go

@@ -186,7 +186,7 @@ func generateSnapshot(triedb *Database, root common.Hash, noBuild bool) *diskLay
 		stats     = &generatorStats{start: time.Now()}
 		genMarker = []byte{} // Initialized but empty!
 	)
-	dl := newDiskLayer(root, 0, triedb, nil, nil, newBuffer(triedb.config.WriteBufferSize, nil, nil, 0), nil)
+	dl := newDiskLayer(root, 0, 0, triedb, nil, nil, newBuffer(triedb.config.WriteBufferSize, nil, nil, 0), nil)
 	dl.setGenerator(newGenerator(triedb.diskdb, noBuild, genMarker, stats))
 
 	if !noBuild {

triedb/pathdb/journal.go

@@ -177,7 +177,19 @@ func (db *Database) loadLayers() layer {
 		log.Info("Failed to load journal, discard it", "err", err)
 	}
 	// Return single layer with persistent state.
-	return newDiskLayer(root, rawdb.ReadPersistentStateID(db.diskdb), db, nil, nil, newBuffer(db.config.WriteBufferSize, nil, nil, 0), nil)
+	stateID := rawdb.ReadPersistentStateID(db.diskdb)
+	var block uint64
+	if stateID > 0 {
+		// Try to get block number from state history metadata
+		blob := rawdb.ReadStateHistoryMeta(db.diskdb, stateID)
+		if blob != nil {
+			var m meta
+			if err := m.decode(blob); err == nil {
+				block = m.block
+			}
+		}
+	}
+	return newDiskLayer(root, stateID, block, db, nil, nil, newBuffer(db.config.WriteBufferSize, nil, nil, 0), nil)
 }
 
 // loadDiskLayer reads the binary blob from the layer journal, reconstructing
@@ -195,6 +207,11 @@ func (db *Database) loadDiskLayer(r *rlp.Stream) (layer, error) {
 	if err := r.Decode(&id); err != nil {
 		return nil, fmt.Errorf("load state id: %v", err)
 	}
+	// Resolve the block number of disk layer
+	var block uint64
+	if err := r.Decode(&block); err != nil {
+		return nil, fmt.Errorf("load block number: %v", err)
+	}
 	stored := rawdb.ReadPersistentStateID(db.diskdb)
 	if stored > id {
 		return nil, fmt.Errorf("invalid state id: stored %d resolved %d", stored, id)
@@ -209,7 +226,7 @@ func (db *Database) loadDiskLayer(r *rlp.Stream) (layer, error) {
 	if err := states.decode(r); err != nil {
 		return nil, err
 	}
-	return newDiskLayer(root, id, db, nil, nil, newBuffer(db.config.WriteBufferSize, &nodes, &states, id-stored), nil), nil
+	return newDiskLayer(root, id, block, db, nil, nil, newBuffer(db.config.WriteBufferSize, &nodes, &states, id-stored), nil), nil
 }
 
 // loadDiffLayer reads the next sections of a layer journal, reconstructing a new
@@ -259,15 +276,19 @@ func (dl *diskLayer) journal(w io.Writer) error {
 	if err := rlp.Encode(w, dl.id); err != nil {
 		return err
 	}
-	// Step three, write the accumulated trie nodes into the journal
+	// Step three, write the corresponding block number into the journal
+	if err := rlp.Encode(w, dl.block); err != nil {
+		return err
+	}
+	// Step four, write the accumulated trie nodes into the journal
 	if err := dl.buffer.nodes.encode(w); err != nil {
 		return err
 	}
-	// Step four, write the accumulated flat states into the journal
+	// Step five, write the accumulated flat states into the journal
 	if err := dl.buffer.states.encode(w); err != nil {
 		return err
 	}
-	log.Debug("Journaled pathdb disk layer", "root", dl.root, "id", dl.id)
+	log.Debug("Journaled pathdb disk layer", "root", dl.root, "id", dl.id, "block", dl.block)
 	return nil
 }
 

triedb/pathdb/layertree_test.go

@@ -26,7 +26,7 @@ import (
 
 func newTestLayerTree() *layerTree {
 	db := New(rawdb.NewMemoryDatabase(), nil, false)
-	l := newDiskLayer(common.Hash{0x1}, 0, db, nil, nil, newBuffer(0, nil, nil, 0), nil)
+	l := newDiskLayer(common.Hash{0x1}, 0, 0, db, nil, nil, newBuffer(0, nil, nil, 0), nil)
 	t := newLayerTree(l)
 	return t
 }