test/functional/txn_doublespend.py

   1 #!/usr/bin/env python3
   2 # Copyright (c) 2014-2016 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
   7 from test_framework.test_framework import BitcoinTestFramework
   8 from test_framework.util import *
   9
  10 class TxnMallTest(BitcoinTestFramework):
  11
  12     def __init__(self):
  13         super().__init__()
  14         self.num_nodes = 4
  15         self.setup_clean_chain = False
  16
  17     def add_options(self, parser):
  18         parser.add_option("--mineblock", dest="mine_block", default=False, action="store_true",
  19                           help="Test double-spend of 1-confirmed transaction")
  20
  21     def setup_network(self):
  22         # Start with split network:
  23         super().setup_network()
  24         disconnect_nodes(self.nodes[1], 2)
  25         disconnect_nodes(self.nodes[2], 1)
  26
  27     def run_test(self):
  28         # All nodes should start with 1,250 BTC:
  29         starting_balance = 1250
  30         for i in range(4):
  31             assert_equal(self.nodes[i].getbalance(), starting_balance)
  32             self.nodes[i].getnewaddress("")  # bug workaround, coins generated assigned to first getnewaddress!
  33
  34         # Assign coins to foo and bar accounts:
  35         node0_address_foo = self.nodes[0].getnewaddress("foo")
  36         fund_foo_txid = self.nodes[0].sendfrom("", node0_address_foo, 1219)
  37         fund_foo_tx = self.nodes[0].gettransaction(fund_foo_txid)
  38
  39         node0_address_bar = self.nodes[0].getnewaddress("bar")
  40         fund_bar_txid = self.nodes[0].sendfrom("", node0_address_bar, 29)
  41         fund_bar_tx = self.nodes[0].gettransaction(fund_bar_txid)
  42
  43         assert_equal(self.nodes[0].getbalance(""),
  44                      starting_balance - 1219 - 29 + fund_foo_tx["fee"] + fund_bar_tx["fee"])
  45
  46         # Coins are sent to node1_address
  47         node1_address = self.nodes[1].getnewaddress("from0")
  48
  49         # First: use raw transaction API to send 1240 BTC to node1_address,
  50         # but don't broadcast:
  51         doublespend_fee = Decimal('-.02')
  52         rawtx_input_0 = {}
  53         rawtx_input_0["txid"] = fund_foo_txid
  54         rawtx_input_0["vout"] = find_output(self.nodes[0], fund_foo_txid, 1219)
  55         rawtx_input_1 = {}
  56         rawtx_input_1["txid"] = fund_bar_txid
  57         rawtx_input_1["vout"] = find_output(self.nodes[0], fund_bar_txid, 29)
  58         inputs = [rawtx_input_0, rawtx_input_1]
  59         change_address = self.nodes[0].getnewaddress()
  60         outputs = {}
  61         outputs[node1_address] = 1240
  62         outputs[change_address] = 1248 - 1240 + doublespend_fee
  63         rawtx = self.nodes[0].createrawtransaction(inputs, outputs)
  64         doublespend = self.nodes[0].signrawtransaction(rawtx)
  65         assert_equal(doublespend["complete"], True)
  66
  67         # Create two spends using 1 50 BTC coin each
  68         txid1 = self.nodes[0].sendfrom("foo", node1_address, 40, 0)
  69         txid2 = self.nodes[0].sendfrom("bar", node1_address, 20, 0)
  70
  71         # Have node0 mine a block:
  72         if (self.options.mine_block):
  73             self.nodes[0].generate(1)
  74             sync_blocks(self.nodes[0:2])
  75
  76         tx1 = self.nodes[0].gettransaction(txid1)
  77         tx2 = self.nodes[0].gettransaction(txid2)
  78
  79         # Node0's balance should be starting balance, plus 50BTC for another
  80         # matured block, minus 40, minus 20, and minus transaction fees:
  81         expected = starting_balance + fund_foo_tx["fee"] + fund_bar_tx["fee"]
  82         if self.options.mine_block: expected += 50
  83         expected += tx1["amount"] + tx1["fee"]
  84         expected += tx2["amount"] + tx2["fee"]
  85         assert_equal(self.nodes[0].getbalance(), expected)
  86
  87         # foo and bar accounts should be debited:
  88         assert_equal(self.nodes[0].getbalance("foo", 0), 1219+tx1["amount"]+tx1["fee"])
  89         assert_equal(self.nodes[0].getbalance("bar", 0), 29+tx2["amount"]+tx2["fee"])
  90
  91         if self.options.mine_block:
  92             assert_equal(tx1["confirmations"], 1)
  93             assert_equal(tx2["confirmations"], 1)
  94             # Node1's "from0" balance should be both transaction amounts:
  95             assert_equal(self.nodes[1].getbalance("from0"), -(tx1["amount"]+tx2["amount"]))
  96         else:
  97             assert_equal(tx1["confirmations"], 0)
  98             assert_equal(tx2["confirmations"], 0)
  99
 100         # Now give doublespend and its parents to miner:
 101         self.nodes[2].sendrawtransaction(fund_foo_tx["hex"])
 102         self.nodes[2].sendrawtransaction(fund_bar_tx["hex"])
 103         doublespend_txid = self.nodes[2].sendrawtransaction(doublespend["hex"])
 104         # ... mine a block...
 105         self.nodes[2].generate(1)
 106
 107         # Reconnect the split network, and sync chain:
 108         connect_nodes(self.nodes[1], 2)
 109         self.nodes[2].generate(1)  # Mine another block to make sure we sync
 110         sync_blocks(self.nodes)
 111         assert_equal(self.nodes[0].gettransaction(doublespend_txid)["confirmations"], 2)
 112
 113         # Re-fetch transaction info:
 114         tx1 = self.nodes[0].gettransaction(txid1)
 115         tx2 = self.nodes[0].gettransaction(txid2)
 116
 117         # Both transactions should be conflicted
 118         assert_equal(tx1["confirmations"], -2)
 119         assert_equal(tx2["confirmations"], -2)
 120
 121         # Node0's total balance should be starting balance, plus 100BTC for
 122         # two more matured blocks, minus 1240 for the double-spend, plus fees (which are
 123         # negative):
 124         expected = starting_balance + 100 - 1240 + fund_foo_tx["fee"] + fund_bar_tx["fee"] + doublespend_fee
 125         assert_equal(self.nodes[0].getbalance(), expected)
 126         assert_equal(self.nodes[0].getbalance("*"), expected)
 127
 128         # Final "" balance is starting_balance - amount moved to accounts - doublespend + subsidies +
 129         # fees (which are negative)
 130         assert_equal(self.nodes[0].getbalance("foo"), 1219)
 131         assert_equal(self.nodes[0].getbalance("bar"), 29)
 132         assert_equal(self.nodes[0].getbalance(""), starting_balance
 133                                                               -1219
 134                                                               -  29
 135                                                               -1240
 136                                                               + 100
 137                                                               + fund_foo_tx["fee"]
 138                                                               + fund_bar_tx["fee"]
 139                                                               + doublespend_fee)
 140
 141         # Node1's "from0" account balance should be just the doublespend:
 142         assert_equal(self.nodes[1].getbalance("from0"), 1240)
 143
 144 if __name__ == '__main__':
 145     TxnMallTest().main()
 146