fixed totp and go mod

vendor/github.com/couchbase/vellum/fst.go

@@ -243,6 +243,52 @@ func (f *FST) Reader() (*Reader, error) {
 	return &Reader{f: f}, nil
 }
 
+func (f *FST) GetMinKey() ([]byte, error) {
+	var rv []byte
+
+	curr := f.decoder.getRoot()
+	state, err := f.decoder.stateAt(curr, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	for !state.Final() {
+		nextTrans := state.TransitionAt(0)
+		_, curr, _ = state.TransitionFor(nextTrans)
+		state, err = f.decoder.stateAt(curr, state)
+		if err != nil {
+			return nil, err
+		}
+
+		rv = append(rv, nextTrans)
+	}
+
+	return rv, nil
+}
+
+func (f *FST) GetMaxKey() ([]byte, error) {
+	var rv []byte
+
+	curr := f.decoder.getRoot()
+	state, err := f.decoder.stateAt(curr, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	for state.NumTransitions() > 0 {
+		nextTrans := state.TransitionAt(state.NumTransitions() - 1)
+		_, curr, _ = state.TransitionFor(nextTrans)
+		state, err = f.decoder.stateAt(curr, state)
+		if err != nil {
+			return nil, err
+		}
+
+		rv = append(rv, nextTrans)
+	}
+
+	return rv, nil
+}
+
 // A Reader is meant for a single threaded use
 type Reader struct {
 	f        *FST