1  #!/usr/bin/env python3
 2  # Copyright (c) 2021-present The Bitcoin Core developers
 3  # Distributed under the MIT software license, see the accompanying
 4  # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 5  """
 6  Test mempool acceptance in case of an already known transaction
 7  with identical non-witness data but different witness.
 8  """
 9  
10  from test_framework.p2p import P2PTxInvStore
11  from test_framework.script_util import build_malleated_tx_package
12  from test_framework.test_framework import BitcoinTestFramework
13  from test_framework.util import (
14      assert_not_equal,
15      assert_equal,
16  )
17  from test_framework.wallet import (
18      MiniWallet,
19  )
20  
21  class MempoolWtxidTest(BitcoinTestFramework):
22      def set_test_params(self):
23          self.num_nodes = 1
24  
25      def run_test(self):
26          node = self.nodes[0]
27          mini_wallet = MiniWallet(node)
28          self.log.info('Start with pre-generated blocks')
29  
30          assert_equal(node.getmempoolinfo()['size'], 0)
31  
32          self.log.info("Submit parent with multiple script branches to mempool")
33  
34          parent = mini_wallet.create_self_transfer()["tx"]
35          parent_amount = parent.vout[0].nValue - 10000
36          child_amount = parent_amount - 10000
37          parent, child_one, child_two = build_malleated_tx_package(
38              parent=parent,
39              rebalance_parent_output_amount=parent_amount,
40              child_amount=child_amount
41          )
42  
43          mini_wallet.sendrawtransaction(from_node=node, tx_hex=parent.serialize().hex())
44  
45          self.generate(node, 1)
46  
47          peer_wtxid_relay = node.add_p2p_connection(P2PTxInvStore())
48  
49          assert_equal(child_one.txid_hex, child_two.txid_hex)
50          assert_not_equal(child_one.wtxid_hex, child_two.wtxid_hex)
51  
52          self.log.info("Submit child_one to the mempool")
53          txid_submitted = node.sendrawtransaction(child_one.serialize().hex())
54          assert_equal(node.getmempoolentry(txid_submitted)['wtxid'], child_one.wtxid_hex)
55          peer_wtxid_relay.wait_for_broadcast([child_one.wtxid_hex])
56          assert_equal(node.getmempoolinfo()["unbroadcastcount"], 0)
57  
58          # testmempoolaccept reports the "already in mempool" error
59          assert_equal(node.testmempoolaccept([child_one.serialize().hex()]), [{
60              "txid": child_one.txid_hex,
61              "wtxid": child_one.wtxid_hex,
62              "allowed": False,
63              "reject-reason": "txn-already-in-mempool",
64              "reject-details": "txn-already-in-mempool"
65          }])
66          assert_equal(node.testmempoolaccept([child_two.serialize().hex()])[0], {
67              "txid": child_two.txid_hex,
68              "wtxid": child_two.wtxid_hex,
69              "allowed": False,
70              "reject-reason": "txn-same-nonwitness-data-in-mempool",
71              "reject-details": "txn-same-nonwitness-data-in-mempool"
72          })
73  
74          # sendrawtransaction will not throw but quits early when the exact same transaction is already in mempool
75          node.sendrawtransaction(child_one.serialize().hex())
76  
77          self.log.info("Connect another peer that hasn't seen child_one before")
78          peer_wtxid_relay_2 = node.add_p2p_connection(P2PTxInvStore())
79  
80          self.log.info("Submit child_two to the mempool")
81          # sendrawtransaction will not throw but quits early when a transaction with the same non-witness data is already in mempool
82          node.sendrawtransaction(child_two.serialize().hex())
83  
84          # The node should rebroadcast the transaction using the wtxid of the correct transaction
85          # (child_one, which is in its mempool).
86          peer_wtxid_relay_2.wait_for_broadcast([child_one.wtxid_hex])
87          assert_equal(node.getmempoolinfo()["unbroadcastcount"], 0)
88  
89  if __name__ == '__main__':
90      MempoolWtxidTest(__file__).main()