mdbx: add trace info to open error (#2305)

* add stack info to open error

* add stack info to open error

ethdb/kv/kv_mdbx.go

@@ -169,7 +169,7 @@ func (opts MdbxOpts) Open() (ethdb.RwKV, error) {
 
 	err = env.Open(opts.path, opts.flags, 0664)
 	if err != nil {
-		return nil, fmt.Errorf("%w, path: %s", err, opts.path)
+		return nil, fmt.Errorf("%w, label: %s, trace: %s", err, opts.label.String(), debug.Callers(10))
 	}
 
 	defaultDirtyPagesLimit, err := env.GetOption(mdbx.OptTxnDpLimit)
@@ -327,7 +327,7 @@ func (db *MdbxKV) Close() {
 			db.log.Warn("failed to remove in-mem db file", "err", err)
 		}
 	} else {
-		db.log.Info("database closed (MDBX)")
+		db.log.Info("database closed (MDBX)", "label", db.opts.label.String(), "exclusive", db.opts.flags&mdbx.Exclusive != 0)
 	}
 }
 
@@ -343,7 +343,7 @@ func (db *MdbxKV) BeginRo(_ context.Context) (txn ethdb.Tx, err error) {
 
 	tx, err := db.env.BeginTxn(nil, mdbx.Readonly)
 	if err != nil {
-		return nil, fmt.Errorf("%w, trace: %s", err, debug.Callers(10))
+		return nil, fmt.Errorf("%w, label: %s, trace: %s", err, db.opts.label.String(), debug.Callers(10))
 	}
 	tx.RawRead = true
 	return &MdbxTx{
@@ -367,7 +367,7 @@ func (db *MdbxKV) BeginRw(_ context.Context) (txn ethdb.RwTx, err error) {
 	tx, err := db.env.BeginTxn(nil, 0)
 	if err != nil {
 		runtime.UnlockOSThread() // unlock only in case of error. normal flow is "defer .Rollback()"
-		return nil, fmt.Errorf("%w, trace: %s", err, debug.Callers(10))
+		return nil, fmt.Errorf("%w, lable: %s, trace: %s", err, db.opts.label.String(), debug.Callers(10))
 	}
 	tx.RawRead = true
 	return &MdbxTx{

ethdb/kv_interface.go

@@ -72,6 +72,19 @@ const (
 	Sentry Label = 2
 )
 
+func (l Label) String() string {
+	switch l {
+	case Chain:
+		return "chaindata"
+	case TxPool:
+		return "txpool"
+	case Sentry:
+		return "sentry"
+	default:
+		return "unknown"
+	}
+}
+
 type Has interface {
 	// Has indicates whether a key exists in the database.
 	Has(bucket string, key []byte) (bool, error)