1  #!/usr/bin/env python3
  2  # Copyright (c) 2014-2022 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  """Test the wallet accounts properly when there is a double-spend conflict."""
  6  from decimal import Decimal
  7  
  8  from test_framework.test_framework import BitcoinTestFramework
  9  from test_framework.util import (
 10      assert_equal,
 11  )
 12  
 13  
 14  class TxnMallTest(BitcoinTestFramework):
 15      def set_test_params(self):
 16          self.num_nodes = 3
 17          self.supports_cli = False
 18  
 19      def skip_test_if_missing_module(self):
 20          self.skip_if_no_wallet()
 21  
 22      def add_options(self, parser):
 23          self.add_wallet_options(parser)
 24          parser.add_argument("--mineblock", dest="mine_block", default=False, action="store_true",
 25                              help="Test double-spend of 1-confirmed transaction")
 26  
 27      def setup_network(self):
 28          # Start with split network:
 29          super().setup_network()
 30          self.disconnect_nodes(1, 2)
 31  
 32      def spend_utxo(self, utxo, outputs):
 33          inputs = [utxo]
 34          tx = self.nodes[0].createrawtransaction(inputs, outputs)
 35          tx = self.nodes[0].fundrawtransaction(tx)
 36          tx = self.nodes[0].signrawtransactionwithwallet(tx['hex'])
 37          return self.nodes[0].sendrawtransaction(tx['hex'])
 38  
 39      def run_test(self):
 40          # All nodes should start with 1,250 BTC:
 41          starting_balance = 1250
 42  
 43          # All nodes should be out of IBD.
 44          # If the nodes are not all out of IBD, that can interfere with
 45          # blockchain sync later in the test when nodes are connected, due to
 46          # timing issues.
 47          for n in self.nodes:
 48              assert n.getblockchaininfo()["initialblockdownload"] == False
 49  
 50          for i in range(3):
 51              assert_equal(self.nodes[i].getbalance(), starting_balance)
 52  
 53          # Assign coins to foo and bar addresses:
 54          node0_address_foo = self.nodes[0].getnewaddress()
 55          fund_foo_utxo = self.create_outpoints(self.nodes[0], outputs=[{node0_address_foo: 1219}])[0]
 56          fund_foo_tx = self.nodes[0].gettransaction(fund_foo_utxo['txid'])
 57          self.nodes[0].lockunspent(False, [fund_foo_utxo])
 58  
 59          node0_address_bar = self.nodes[0].getnewaddress()
 60          fund_bar_utxo = self.create_outpoints(node=self.nodes[0], outputs=[{node0_address_bar: 29}])[0]
 61          fund_bar_tx = self.nodes[0].gettransaction(fund_bar_utxo['txid'])
 62  
 63          assert_equal(self.nodes[0].getbalance(),
 64                       starting_balance + fund_foo_tx["fee"] + fund_bar_tx["fee"])
 65  
 66          # Coins are sent to node1_address
 67          node1_address = self.nodes[1].getnewaddress()
 68  
 69          # First: use raw transaction API to send 1240 BTC to node1_address,
 70          # but don't broadcast:
 71          doublespend_fee = Decimal('-.02')
 72          inputs = [fund_foo_utxo, fund_bar_utxo]
 73          change_address = self.nodes[0].getnewaddress()
 74          outputs = {}
 75          outputs[node1_address] = 1240
 76          outputs[change_address] = 1248 - 1240 + doublespend_fee
 77          rawtx = self.nodes[0].createrawtransaction(inputs, outputs)
 78          doublespend = self.nodes[0].signrawtransactionwithwallet(rawtx)
 79          assert_equal(doublespend["complete"], True)
 80  
 81          # Create two spends using 1 50 BTC coin each
 82          txid1 = self.spend_utxo(fund_foo_utxo, {node1_address: 40})
 83          txid2 = self.spend_utxo(fund_bar_utxo, {node1_address: 20})
 84  
 85          # Have node0 mine a block:
 86          if (self.options.mine_block):
 87              self.generate(self.nodes[0], 1, sync_fun=lambda: self.sync_blocks(self.nodes[0:2]))
 88  
 89          tx1 = self.nodes[0].gettransaction(txid1)
 90          tx2 = self.nodes[0].gettransaction(txid2)
 91  
 92          # Node0's balance should be starting balance, plus 50BTC for another
 93          # matured block, minus 40, minus 20, and minus transaction fees:
 94          expected = starting_balance + fund_foo_tx["fee"] + fund_bar_tx["fee"]
 95          if self.options.mine_block:
 96              expected += 50
 97          expected += tx1["amount"] + tx1["fee"]
 98          expected += tx2["amount"] + tx2["fee"]
 99          assert_equal(self.nodes[0].getbalance(), expected)
100  
101          if self.options.mine_block:
102              assert_equal(tx1["confirmations"], 1)
103              assert_equal(tx2["confirmations"], 1)
104              # Node1's balance should be both transaction amounts:
105              assert_equal(self.nodes[1].getbalance(), starting_balance - tx1["amount"] - tx2["amount"])
106          else:
107              assert_equal(tx1["confirmations"], 0)
108              assert_equal(tx2["confirmations"], 0)
109  
110          # Now give doublespend and its parents to miner:
111          self.nodes[2].sendrawtransaction(fund_foo_tx["hex"])
112          self.nodes[2].sendrawtransaction(fund_bar_tx["hex"])
113          doublespend_txid = self.nodes[2].sendrawtransaction(doublespend["hex"])
114          # ... mine a block...
115          self.generate(self.nodes[2], 1, sync_fun=self.no_op)
116  
117          # Reconnect the split network, and sync chain:
118          self.connect_nodes(1, 2)
119          self.generate(self.nodes[2], 1)  # Mine another block to make sure we sync
120          assert_equal(self.nodes[0].gettransaction(doublespend_txid)["confirmations"], 2)
121  
122          # Re-fetch transaction info:
123          tx1 = self.nodes[0].gettransaction(txid1)
124          tx2 = self.nodes[0].gettransaction(txid2)
125  
126          # Both transactions should be conflicted
127          assert_equal(tx1["confirmations"], -2)
128          assert_equal(tx2["confirmations"], -2)
129  
130          # Node0's total balance should be starting balance, plus 100BTC for
131          # two more matured blocks, minus 1240 for the double-spend, plus fees (which are
132          # negative):
133          expected = starting_balance + 100 - 1240 + fund_foo_tx["fee"] + fund_bar_tx["fee"] + doublespend_fee
134          assert_equal(self.nodes[0].getbalance(), expected)
135  
136          # Node1's balance should be its initial balance (1250 for 25 block rewards) plus the doublespend:
137          assert_equal(self.nodes[1].getbalance(), 1250 + 1240)
138  
139  
140  if __name__ == '__main__':
141      TxnMallTest().main()