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