system: Allow preselecting inputs for atomic swaps.

basicswap/protocols/__init__.py

@@ -0,0 +1,12 @@
+# -*- coding: utf-8 -*-
+
+# Copyright (c) 2022 tecnovert
+# Distributed under the MIT software license, see the accompanying
+# file LICENSE or http://www.opensource.org/licenses/mit-license.php.
+
+
+class ProtocolInterface:
+    swap_type = None
+
+    def getFundedInitiateTxTemplate(self, ci, amount: int, sub_fee: bool) -> bytes:
+        raise ValueError('base class')