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#!/usr/bin/env python3
# Copyright (c) 2014-2020 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
"""Test the wallet accounts properly when there is a double-spend conflict."""
from decimal import Decimal
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import (
assert_equal,
find_output,
)
class TxnMallTest(BitcoinTestFramework):
def set_test_params(self):
self.num_nodes = 4
self.supports_cli = False
def skip_test_if_missing_module(self):
self.skip_if_no_wallet()
def add_options(self, parser):
parser.add_argument("--mineblock", dest="mine_block", default=False, action="store_true",
help="Test double-spend of 1-confirmed transaction")
def setup_network(self):
# Start with split network:
super().setup_network()
self.disconnect_nodes(1, 2)
def run_test(self):
# All nodes should start with 1,250 BTC:
starting_balance = 1250
# All nodes should be out of IBD.
# If the nodes are not all out of IBD, that can interfere with
# blockchain sync later in the test when nodes are connected, due to
# timing issues.
for n in self.nodes:
assert n.getblockchaininfo()["initialblockdownload"] == False
for i in range(4):
assert_equal(self.nodes[i].getbalance(), starting_balance)
self.nodes[i].getnewaddress("") # bug workaround, coins generated assigned to first getnewaddress!
# Assign coins to foo and bar addresses:
node0_address_foo = self.nodes[0].getnewaddress()
fund_foo_txid = self.nodes[0].sendtoaddress(node0_address_foo, 1219)
fund_foo_tx = self.nodes[0].gettransaction(fund_foo_txid)
node0_address_bar = self.nodes[0].getnewaddress()
fund_bar_txid = self.nodes[0].sendtoaddress(node0_address_bar, 29)
fund_bar_tx = self.nodes[0].gettransaction(fund_bar_txid)
assert_equal(self.nodes[0].getbalance(),
starting_balance + fund_foo_tx["fee"] + fund_bar_tx["fee"])
# Coins are sent to node1_address
node1_address = self.nodes[1].getnewaddress()
# First: use raw transaction API to send 1240 BTC to node1_address,
# but don't broadcast:
doublespend_fee = Decimal('-.02')
rawtx_input_0 = {}
rawtx_input_0["txid"] = fund_foo_txid
rawtx_input_0["vout"] = find_output(self.nodes[0], fund_foo_txid, 1219)
rawtx_input_1 = {}
rawtx_input_1["txid"] = fund_bar_txid
rawtx_input_1["vout"] = find_output(self.nodes[0], fund_bar_txid, 29)
inputs = [rawtx_input_0, rawtx_input_1]
change_address = self.nodes[0].getnewaddress()
outputs = {}
outputs[node1_address] = 1240
outputs[change_address] = 1248 - 1240 + doublespend_fee
rawtx = self.nodes[0].createrawtransaction(inputs, outputs)
doublespend = self.nodes[0].signrawtransactionwithwallet(rawtx)
assert_equal(doublespend["complete"], True)
# Create two spends using 1 50 BTC coin each
txid1 = self.nodes[0].sendtoaddress(node1_address, 40)
txid2 = self.nodes[0].sendtoaddress(node1_address, 20)
# Have node0 mine a block:
if (self.options.mine_block):
self.nodes[0].generate(1)
self.sync_blocks(self.nodes[0:2])
tx1 = self.nodes[0].gettransaction(txid1)
tx2 = self.nodes[0].gettransaction(txid2)
# Node0's balance should be starting balance, plus 50BTC for another
# matured block, minus 40, minus 20, and minus transaction fees:
expected = starting_balance + fund_foo_tx["fee"] + fund_bar_tx["fee"]
if self.options.mine_block:
expected += 50
expected += tx1["amount"] + tx1["fee"]
expected += tx2["amount"] + tx2["fee"]
assert_equal(self.nodes[0].getbalance(), expected)
if self.options.mine_block:
assert_equal(tx1["confirmations"], 1)
assert_equal(tx2["confirmations"], 1)
# Node1's balance should be both transaction amounts:
assert_equal(self.nodes[1].getbalance(), starting_balance - tx1["amount"] - tx2["amount"])
else:
assert_equal(tx1["confirmations"], 0)
assert_equal(tx2["confirmations"], 0)
# Now give doublespend and its parents to miner:
self.nodes[2].sendrawtransaction(fund_foo_tx["hex"])
self.nodes[2].sendrawtransaction(fund_bar_tx["hex"])
doublespend_txid = self.nodes[2].sendrawtransaction(doublespend["hex"])
# ... mine a block...
self.nodes[2].generate(1)
# Reconnect the split network, and sync chain:
self.connect_nodes(1, 2)
self.nodes[2].generate(1) # Mine another block to make sure we sync
self.sync_blocks()
assert_equal(self.nodes[0].gettransaction(doublespend_txid)["confirmations"], 2)
# Re-fetch transaction info:
tx1 = self.nodes[0].gettransaction(txid1)
tx2 = self.nodes[0].gettransaction(txid2)
# Both transactions should be conflicted
assert_equal(tx1["confirmations"], -2)
assert_equal(tx2["confirmations"], -2)
# Node0's total balance should be starting balance, plus 100BTC for
# two more matured blocks, minus 1240 for the double-spend, plus fees (which are
# negative):
expected = starting_balance + 100 - 1240 + fund_foo_tx["fee"] + fund_bar_tx["fee"] + doublespend_fee
assert_equal(self.nodes[0].getbalance(), expected)
# Node1's balance should be its initial balance (1250 for 25 block rewards) plus the doublespend:
assert_equal(self.nodes[1].getbalance(), 1250 + 1240)
if __name__ == '__main__':
TxnMallTest().main()
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