[#1255] node/session: Add persistent session storage

Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>

pkg/services/session/storage/util.go

@@ -0,0 +1,23 @@
+package storage
+
+import (
+	"fmt"
+
+	"github.com/google/uuid"
+)
+
+// NewTokenID generates new ID for a token
+// based on UUID.
+func NewTokenID() ([]byte, error) {
+	uid, err := uuid.NewRandom()
+	if err != nil {
+		return nil, fmt.Errorf("could not generate UUID: %w", err)
+	}
+
+	uidBytes, err := uid.MarshalBinary()
+	if err != nil {
+		return nil, fmt.Errorf("could not marshal marshal UUID: %w", err)
+	}
+
+	return uidBytes, nil
+}