core/rawdb: refactor db key prefix (#26000)

Co-authored-by: seven <seven@nodereal.io>

core/rawdb/database.go

@@ -439,15 +439,15 @@ func InspectDatabase(db ethdb.Database, keyPrefix, keyStart []byte) error {
 			bloomBits.Add(size)
 		case bytes.HasPrefix(key, skeletonHeaderPrefix) && len(key) == (len(skeletonHeaderPrefix)+8):
 			beaconHeaders.Add(size)
-		case bytes.HasPrefix(key, []byte("clique-")) && len(key) == 7+common.HashLength:
+		case bytes.HasPrefix(key, CliqueSnapshotPrefix) && len(key) == 7+common.HashLength:
 			cliqueSnaps.Add(size)
-		case bytes.HasPrefix(key, []byte("cht-")) ||
-			bytes.HasPrefix(key, []byte("chtIndexV2-")) ||
-			bytes.HasPrefix(key, []byte("chtRootV2-")): // Canonical hash trie
+		case bytes.HasPrefix(key, ChtTablePrefix) ||
+			bytes.HasPrefix(key, ChtIndexTablePrefix) ||
+			bytes.HasPrefix(key, ChtPrefix): // Canonical hash trie
 			chtTrieNodes.Add(size)
-		case bytes.HasPrefix(key, []byte("blt-")) ||
-			bytes.HasPrefix(key, []byte("bltIndex-")) ||
-			bytes.HasPrefix(key, []byte("bltRoot-")): // Bloomtrie sub
+		case bytes.HasPrefix(key, BloomTrieTablePrefix) ||
+			bytes.HasPrefix(key, BloomTrieIndexPrefix) ||
+			bytes.HasPrefix(key, BloomTriePrefix): // Bloomtrie sub
 			bloomTrieNodes.Add(size)
 		default:
 			var accounted bool

core/rawdb/schema.go

@@ -109,6 +109,16 @@ var (
 	// BloomBitsIndexPrefix is the data table of a chain indexer to track its progress
 	BloomBitsIndexPrefix = []byte("iB")
 
+	ChtPrefix           = []byte("chtRootV2-") // ChtPrefix + chtNum (uint64 big endian) -> trie root hash
+	ChtTablePrefix      = []byte("cht-")
+	ChtIndexTablePrefix = []byte("chtIndexV2-")
+
+	BloomTriePrefix      = []byte("bltRoot-") // BloomTriePrefix + bloomTrieNum (uint64 big endian) -> trie root hash
+	BloomTrieTablePrefix = []byte("blt-")
+	BloomTrieIndexPrefix = []byte("bltIndex-")
+
+	CliqueSnapshotPrefix = []byte("clique-")
+
 	preimageCounter    = metrics.NewRegisteredCounter("db/preimage/total", nil)
 	preimageHitCounter = metrics.NewRegisteredCounter("db/preimage/hits", nil)
 )