From 9aadac61be76b9f4d9e12bd9d491289bd5296e69 Mon Sep 17 00:00:00 2001
From: Zsolt Felfoldi <zsfelfoldi@gmail.com>
Date: Fri, 17 Jan 2025 03:23:56 +0100
Subject: [PATCH] ethdb/memorydb: faster DeleteRange

---
 ethdb/memorydb/memorydb.go | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/ethdb/memorydb/memorydb.go b/ethdb/memorydb/memorydb.go
index c6fba39cfd..4d932bb631 100644
--- a/ethdb/memorydb/memorydb.go
+++ b/ethdb/memorydb/memorydb.go
@@ -18,7 +18,6 @@
 package memorydb
 
 import (
-	"bytes"
 	"errors"
 	"sort"
 	"strings"
@@ -125,12 +124,12 @@ func (db *Database) Delete(key []byte) error {
 // DeleteRange deletes all of the keys (and values) in the range [start,end)
 // (inclusive on start, exclusive on end).
 func (db *Database) DeleteRange(start, end []byte) error {
-	it := db.NewIterator(nil, start)
-	defer it.Release()
+	db.lock.Lock()
+	defer db.lock.Unlock()
 
-	for it.Next() && bytes.Compare(end, it.Key()) > 0 {
-		if err := db.Delete(it.Key()); err != nil {
-			return err
+	for key := range db.db {
+		if key >= string(start) && key < string(end) {
+			delete(db.db, key)
 		}
 	}
 	return nil