commands: allow setting custom 'nsequence' in 'serialize' cmd

closes #6297

electrum/commands.py

@@ -372,6 +372,9 @@ class Commands:
                 raise Exception("missing prevout for txin")
             txin = PartialTxInput(prevout=prevout)
             txin._trusted_value_sats = int(txin_dict['value'])
+            nsequence = txin_dict.get('nsequence', None)
+            if nsequence is not None:
+                txin.nsequence = nsequence
             sec = txin_dict.get('privkey')
             if sec:
                 txin_type, privkey, compressed = bitcoin.deserialize_privkey(sec)

electrum/tests/test_commands.py

@@ -181,6 +181,28 @@ class TestCommandsTestnet(TestCaseForTestnet):
         self.assertEqual("0200000000010139c5375fe9da7bd377c1783002b129f8c57d3e724d62f5eacb9739ca691a229d0100000000feffffff01301b0f0000000000160014ac0e2d229200bffb2167ed6fd196aef9d687d8bb0247304402206367fb2ddd723985f5f51e0f2435084c0a66f5c26f4403a75d3dd417b71a20450220545dc3637bcb49beedbbdf5063e05cad63be91af4f839886451c30ecd6edf1d20121021f110909ded653828a254515b58498a6bafc96799fb0851554463ed44ca7d9da00000000",
                          cmds._run('serialize', (jsontx,)))
 
+    def test_serialize_custom_nsequence(self):
+        cmds = Commands(config=self.config)
+        jsontx = {
+            "inputs": [
+                {
+                    "prevout_hash": "9d221a69ca3997cbeaf5624d723e7dc5f829b1023078c177d37bdae95f37c539",
+                    "prevout_n": 1,
+                    "value": 1000000,
+                    "privkey": "p2wpkh:cVDXzzQg6RoCTfiKpe8MBvmm5d5cJc6JLuFApsFDKwWa6F5TVHpD",
+                    "nsequence": 0xfffffffd
+                }
+            ],
+            "outputs": [
+                {
+                    "address": "tb1q4s8z6g5jqzllkgt8a4har94wl8tg0k9m8kv5zd",
+                    "value": 990000
+                }
+            ]
+        }
+        self.assertEqual("0200000000010139c5375fe9da7bd377c1783002b129f8c57d3e724d62f5eacb9739ca691a229d0100000000feffffff01301b0f0000000000160014ac0e2d229200bffb2167ed6fd196aef9d687d8bb0247304402206367fb2ddd723985f5f51e0f2435084c0a66f5c26f4403a75d3dd417b71a20450220545dc3637bcb49beedbbdf5063e05cad63be91af4f839886451c30ecd6edf1d20121021f110909ded653828a254515b58498a6bafc96799fb0851554463ed44ca7d9da00000000",
+                         cmds._run('serialize', (jsontx,)))
+
     @mock.patch.object(wallet.Abstract_Wallet, 'save_db')
     def test_getprivatekeyforpath(self, mock_save_db):
         wallet = restore_wallet_from_text('north rent dawn bunker hamster invest wagon market romance pig either squeeze',