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