internal/ethapi: fix debug.chaindbProperty

internal/ethapi/api.go

@@ -44,7 +44,6 @@ import (
 	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/rlp"
 	"github.com/ethereum/go-ethereum/rpc"
-	"github.com/syndtr/goleveldb/leveldb"
 	"github.com/tyler-smith/go-bip39"
 )
 
@@ -1633,22 +1632,18 @@ func NewPrivateDebugAPI(b Backend) *PrivateDebugAPI {
 	return &PrivateDebugAPI{b: b}
 }
 
-// ChaindbProperty returns leveldb properties of the chain database.
+// ChaindbProperty returns leveldb properties of the key-value database.
 func (api *PrivateDebugAPI) ChaindbProperty(property string) (string, error) {
-	ldb, ok := api.b.ChainDb().(interface {
-		LDB() *leveldb.DB
-	})
-	if !ok {
-		return "", fmt.Errorf("chaindbProperty does not work for memory databases")
-	}
 	if property == "" {
 		property = "leveldb.stats"
 	} else if !strings.HasPrefix(property, "leveldb.") {
 		property = "leveldb." + property
 	}
-	return ldb.LDB().GetProperty(property)
+	return api.b.ChainDb().Stat(property)
 }
 
+// ChaindbCompact flattens the entire key-value database into a single level,
+// removing all unused slots and merging all keys.
 func (api *PrivateDebugAPI) ChaindbCompact() error {
 	for b := byte(0); b < 255; b++ {
 		log.Info("Compacting chain database", "range", fmt.Sprintf("0x%0.2X-0x%0.2X", b, b+1))