ethdb: Implement DeleteRange in batch

core/rawdb/table.go

@@ -223,6 +223,11 @@ func (b *tableBatch) Delete(key []byte) error {
 	return b.batch.Delete(append([]byte(b.prefix), key...))
 }
 
+// DeleteRange removes all keys in the range [start, end) from the batch for later committing.
+func (b *tableBatch) DeleteRange(start, end []byte) error {
+	return b.batch.DeleteRange(append([]byte(b.prefix), start...), append([]byte(b.prefix), end...))
+}
+
 // ValueSize retrieves the amount of data queued up for writing.
 func (b *tableBatch) ValueSize() int {
 	return b.batch.ValueSize()

ethdb/batch.go

@@ -24,6 +24,7 @@ const IdealBatchSize = 100 * 1024
 // when Write is called. A batch cannot be used concurrently.
 type Batch interface {
 	KeyValueWriter
+	KeyValueRangeDeleter
 
 	// ValueSize retrieves the amount of data queued up for writing.
 	ValueSize() int
@@ -53,8 +54,9 @@ type Batcher interface {
 type HookedBatch struct {
 	Batch
 
-	OnPut    func(key []byte, value []byte) // Callback if a key is inserted
-	OnDelete func(key []byte)               // Callback if a key is deleted
+	OnPut         func(key []byte, value []byte) // Callback if a key is inserted
+	OnDelete      func(key []byte)               // Callback if a key is deleted
+	OnDeleteRange func(start, end []byte)        // Callback if a range of keys is deleted
 }
 
 // Put inserts the given value into the key-value data store.
@@ -72,3 +74,11 @@ func (b HookedBatch) Delete(key []byte) error {
 	}
 	return b.Batch.Delete(key)
 }
+
+// DeleteRange removes all keys in the range [start, end) from the key-value data store.
+func (b HookedBatch) DeleteRange(start, end []byte) error {
+	if b.OnDeleteRange != nil {
+		b.OnDeleteRange(start, end)
+	}
+	return b.Batch.DeleteRange(start, end)
+}

ethdb/database.go

@@ -48,7 +48,7 @@
 	// (inclusive on start, exclusive on end).
 	// Some implementations of DeleteRange may return ErrTooManyKeys after
 	// partially deleting entries in the given range.
-	DeleteRange(start, end []byte) error
+	DeleteRange(start, end []byte) error	
 }
 
 // KeyValueStater wraps the Stat method of a backing data store.