core/rawdb: add truncateHeadBlocks to interface

core/rawdb/database.go

@@ -126,6 +126,11 @@ func (db *nofreezedb) TruncateTail(items uint64) (uint64, error) {
 	return 0, errNotSupported
 }
 
+// TruncateTailBlock returns an error as we don't have a backing chain freezer.
+func (db *nofreezedb) TruncateTailBlocks(items uint64) (uint64, error) {
+	return 0, errNotSupported
+}
+
 // Sync returns an error as we don't have a backing chain freezer.
 func (db *nofreezedb) Sync() error {
 	return errNotSupported

core/rawdb/freezer.go

@@ -301,9 +301,9 @@ func (f *Freezer) TruncateHead(items uint64) (uint64, error) {
 	return oitems, nil
 }
 
-// TruncateTailNoHeads discards any recent data below the provided threshold number.
-// Does not truncate the header and hash table
-func (f *Freezer) TruncateTailNoHeads(tail uint64) (uint64, error) {
+// TruncateTailBlocks discards any recent data below the provided threshold number.
+// Only truncates blocks and receipts.
+func (f *Freezer) TruncateTailBlocks(tail uint64) (uint64, error) {
 	if f.readonly {
 		return 0, errReadOnly
 	}
@@ -315,11 +315,10 @@ func (f *Freezer) TruncateTailNoHeads(tail uint64) (uint64, error) {
 		return old, nil
 	}
 	for kind, table := range f.tables {
-		if kind == ChainFreezerHeaderTable || kind == ChainFreezerHashTable {
-			continue
-		}
-		if err := table.truncateTail(tail); err != nil {
-			return 0, err
+		if kind == ChainFreezerBodiesTable || kind == ChainFreezerReceiptTable {
+			if err := table.truncateTail(tail); err != nil {
+				return 0, err
+			}
 		}
 	}
 	f.tail.Store(tail)

core/rawdb/freezer_memory.go

@@ -389,6 +389,30 @@ func (f *MemoryFreezer) TruncateTail(tail uint64) (uint64, error) {
 	return old, nil
 }
 
+// TruncateTailBlocks discards any recent data below the provided threshold number.
+// Only truncates blocks and receipts.
+func (f *MemoryFreezer) TruncateTailBlocks(tail uint64) (uint64, error) {
+	f.lock.Lock()
+	defer f.lock.Unlock()
+
+	if f.readonly {
+		return 0, errReadOnly
+	}
+	old := f.tail
+	if old >= tail {
+		return old, nil
+	}
+	for kind, table := range f.tables {
+		if kind == ChainFreezerBodiesTable || kind == ChainFreezerReceiptTable {
+			if err := table.truncateTail(tail); err != nil {
+				return 0, err
+			}
+		}
+	}
+	f.tail = tail
+	return old, nil
+}
+
 // Sync flushes all data tables to disk.
 func (f *MemoryFreezer) Sync() error {
 	return nil

core/rawdb/freezer_resettable.go

@@ -194,6 +194,15 @@ func (f *resettableFreezer) TruncateTail(tail uint64) (uint64, error) {
 	return f.freezer.TruncateTail(tail)
 }
 
+// TruncateTailBlocks discards any recent data below the provided threshold number.
+// It returns the previous value
+func (f *resettableFreezer) TruncateTailBlocks(tail uint64) (uint64, error) {
+	f.lock.RLock()
+	defer f.lock.RUnlock()
+
+	return f.freezer.TruncateTailBlocks(tail)
+}
+
 // Sync flushes all data tables to disk.
 func (f *resettableFreezer) Sync() error {
 	f.lock.RLock()

core/rawdb/table.go

@@ -107,6 +107,12 @@ func (t *table) TruncateTail(items uint64) (uint64, error) {
 	return t.db.TruncateTail(items)
 }
 
+// TruncateTailBlocks is a noop passthrough that just forwards the request to the underlying
+// database.
+func (t *table) TruncateTailBlocks(items uint64) (uint64, error) {
+	return t.db.TruncateTailBlocks(items)
+}
+
 // Sync is a noop passthrough that just forwards the request to the underlying
 // database.
 func (t *table) Sync() error {

ethdb/database.go

@@ -130,6 +130,13 @@ type AncientWriter interface {
 	// will be removed all together.
 	TruncateTail(n uint64) (uint64, error)
 
+	// TruncateTailBlocks discards the first n ancient data from the ancient store. The already
+	// deleted items are ignored. After the truncation, the earliest item can be accessed
+	// is item_n(start from 0). The deleted items may not be removed from the ancient store
+	// immediately, but only when the accumulated deleted data reach the threshold then
+	// will be removed all together. Only deletes bodies and receipts.
+	TruncateTailBlocks(n uint64) (uint64, error)
+
 	// Sync flushes all in-memory ancient store data to disk.
 	Sync() error
 }

ethdb/remotedb/remotedb.go

@@ -110,6 +110,10 @@ func (db *Database) TruncateTail(n uint64) (uint64, error) {
 	panic("not supported")
 }
 
+func (db *Database) TruncateTailBlocks(n uint64) (uint64, error) {
+	panic("not supported")
+}
+
 func (db *Database) Sync() error {
 	return nil
 }