cmd, core, eth, light, trie: add trie read caching layer

trie/trie_test.go

@@ -119,7 +119,7 @@ func testMissingNode(t *testing.T, memonly bool) {
 
 	hash := common.HexToHash("0xe1d943cc8f061a0c0b98162830b970395ac9315654824bf21b73b891365262f9")
 	if memonly {
-		delete(triedb.nodes, hash)
+		delete(triedb.dirties, hash)
 	} else {
 		diskdb.Delete(hash[:])
 	}
@@ -342,15 +342,16 @@ func TestCacheUnload(t *testing.T) {
 	// Commit the trie repeatedly and access key1.
 	// The branch containing it is loaded from DB exactly two times:
 	// in the 0th and 6th iteration.
-	db := &countingDB{Database: trie.db.diskdb, gets: make(map[string]int)}
-	trie, _ = New(root, NewDatabase(db))
+	diskdb := &countingDB{Database: trie.db.diskdb, gets: make(map[string]int)}
+	triedb := NewDatabase(diskdb)
+	trie, _ = New(root, triedb)
 	trie.SetCacheLimit(5)
 	for i := 0; i < 12; i++ {
 		getString(trie, key1)
 		trie.Commit(nil)
 	}
 	// Check that it got loaded two times.
-	for dbkey, count := range db.gets {
+	for dbkey, count := range diskdb.gets {
 		if count != 2 {
 			t.Errorf("db key %x loaded %d times, want %d times", []byte(dbkey), count, 2)
 		}