core, ethdb, trie: mode dirty data to clean cache on flush (#19307)

This PR is a more advanced form of the dirty-to-clean cacher (#18995),
where we reuse previous database write batches as datasets to uncache,
saving a dirty-trie-iteration and a dirty-trie-rlp-reencoding per block.

1 files changed, 29 insertions, 0 deletions

diff --git a/ethdb/leveldb/leveldb.go b/ethdb/leveldb/leveldb.go
index f730887d2..f437cb974 100644
--- a/ethdb/leveldb/leveldb.go
+++ b/ethdb/leveldb/leveldb.go
@@ -416,3 +416,32 @@ func (b *batch) Reset() {
 	b.b.Reset()
 	b.size = 0
 }
+
+// Replay replays the batch contents.
+func (b *batch) Replay(w ethdb.Writer) error {
+	return b.b.Replay(&replayer{writer: w})
+}
+
+// replayer is a small wrapper to implement the correct replay methods.
+type replayer struct {
+	writer  ethdb.Writer
+	failure error
+}
+
+// Put inserts the given value into the key-value data store.
+func (r *replayer) Put(key, value []byte) {
+	// If the replay already failed, stop executing ops
+	if r.failure != nil {
+		return
+	}
+	r.failure = r.writer.Put(key, value)
+}
+
+// Delete removes the key from the key-value data store.
+func (r *replayer) Delete(key []byte) {
+	// If the replay already failed, stop executing ops
+	if r.failure != nil {
+		return
+	}
+	r.failure = r.writer.Delete(key)
+}