|
|
|
#!/usr/bin/env python3
|
|
|
|
# Copyright (c) 2015 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 replace-by-fee
|
|
|
|
#
|
|
|
|
|
|
|
|
import os
|
|
|
|
import sys
|
|
|
|
|
|
|
|
# Add python-bitcoinlib to module search path:
|
|
|
|
sys.path.append(os.path.join(os.path.dirname(os.path.abspath(__file__)), "python-bitcoinlib"))
|
|
|
|
|
|
|
|
import unittest
|
|
|
|
|
|
|
|
import bitcoin
|
|
|
|
bitcoin.SelectParams('regtest')
|
|
|
|
|
|
|
|
import bitcoin.rpc
|
|
|
|
|
|
|
|
from bitcoin.core import *
|
|
|
|
from bitcoin.core.script import *
|
|
|
|
from bitcoin.wallet import *
|
|
|
|
|
|
|
|
MAX_REPLACEMENT_LIMIT = 100
|
|
|
|
|
|
|
|
class Test_ReplaceByFee(unittest.TestCase):
|
|
|
|
proxy = None
|
|
|
|
|
|
|
|
@classmethod
|
|
|
|
def setUpClass(cls):
|
|
|
|
if cls.proxy is None:
|
|
|
|
cls.proxy = bitcoin.rpc.Proxy()
|
|
|
|
|
|
|
|
@classmethod
|
|
|
|
def mine_mempool(cls):
|
|
|
|
"""Mine until mempool is empty"""
|
|
|
|
mempool_size = 1
|
|
|
|
while mempool_size:
|
|
|
|
cls.proxy.call('generate', 1)
|
|
|
|
new_mempool_size = len(cls.proxy.getrawmempool())
|
|
|
|
|
|
|
|
# It's possible to get stuck in a loop here if the mempool has
|
|
|
|
# transactions that can't be mined.
|
|
|
|
assert(new_mempool_size != mempool_size)
|
|
|
|
mempool_size = new_mempool_size
|
|
|
|
|
|
|
|
@classmethod
|
|
|
|
def tearDownClass(cls):
|
|
|
|
# Make sure mining works
|
|
|
|
cls.mine_mempool()
|
|
|
|
|
|
|
|
def make_txout(self, amount, confirmed=True, scriptPubKey=CScript([1])):
|
|
|
|
"""Create a txout with a given amount and scriptPubKey
|
|
|
|
|
|
|
|
Mines coins as needed.
|
|
|
|
|
|
|
|
confirmed - txouts created will be confirmed in the blockchain;
|
|
|
|
unconfirmed otherwise.
|
|
|
|
"""
|
|
|
|
fee = 1*COIN
|
|
|
|
while self.proxy.getbalance() < amount + fee:
|
|
|
|
self.proxy.call('generate', 100)
|
|
|
|
|
|
|
|
addr = P2SHBitcoinAddress.from_redeemScript(CScript([]))
|
|
|
|
txid = self.proxy.sendtoaddress(addr, amount + fee)
|
|
|
|
|
|
|
|
tx1 = self.proxy.getrawtransaction(txid)
|
|
|
|
|
|
|
|
i = None
|
|
|
|
for i, txout in enumerate(tx1.vout):
|
|
|
|
if txout.scriptPubKey == addr.to_scriptPubKey():
|
|
|
|
break
|
|
|
|
assert i is not None
|
|
|
|
|
|
|
|
tx2 = CTransaction([CTxIn(COutPoint(txid, i), CScript([1, CScript([])]), nSequence=0)],
|
|
|
|
[CTxOut(amount, scriptPubKey)])
|
|
|
|
|
|
|
|
tx2_txid = self.proxy.sendrawtransaction(tx2, True)
|
|
|
|
|
|
|
|
# If requested, ensure txouts are confirmed.
|
|
|
|
if confirmed:
|
|
|
|
self.mine_mempool()
|
|
|
|
|
|
|
|
return COutPoint(tx2_txid, 0)
|
|
|
|
|
|
|
|
def test_simple_doublespend(self):
|
|
|
|
"""Simple doublespend"""
|
|
|
|
tx0_outpoint = self.make_txout(1.1*COIN)
|
|
|
|
|
|
|
|
tx1a = CTransaction([CTxIn(tx0_outpoint, nSequence=0)],
|
|
|
|
[CTxOut(1*COIN, CScript([b'a']))])
|
|
|
|
tx1a_txid = self.proxy.sendrawtransaction(tx1a, True)
|
|
|
|
|
|
|
|
# Should fail because we haven't changed the fee
|
|
|
|
tx1b = CTransaction([CTxIn(tx0_outpoint, nSequence=0)],
|
|
|
|
[CTxOut(1*COIN, CScript([b'b']))])
|
|
|
|
|
|
|
|
try:
|
|
|
|
tx1b_txid = self.proxy.sendrawtransaction(tx1b, True)
|
|
|
|
except bitcoin.rpc.JSONRPCException as exp:
|
|
|
|
self.assertEqual(exp.error['code'], -26) # insufficient fee
|
|
|
|
else:
|
|
|
|
self.fail()
|
|
|
|
|
|
|
|
# Extra 0.1 BTC fee
|
|
|
|
tx1b = CTransaction([CTxIn(tx0_outpoint, nSequence=0)],
|
|
|
|
[CTxOut(0.9*COIN, CScript([b'b']))])
|
|
|
|
tx1b_txid = self.proxy.sendrawtransaction(tx1b, True)
|
|
|
|
|
|
|
|
# tx1a is in fact replaced
|
|
|
|
with self.assertRaises(IndexError):
|
|
|
|
self.proxy.getrawtransaction(tx1a_txid)
|
|
|
|
|
|
|
|
self.assertEqual(tx1b, self.proxy.getrawtransaction(tx1b_txid))
|
|
|
|
|
|
|
|
def test_doublespend_chain(self):
|
|
|
|
"""Doublespend of a long chain"""
|
|
|
|
|
|
|
|
initial_nValue = 50*COIN
|
|
|
|
tx0_outpoint = self.make_txout(initial_nValue)
|
|
|
|
|
|
|
|
prevout = tx0_outpoint
|
|
|
|
remaining_value = initial_nValue
|
|
|
|
chain_txids = []
|
|
|
|
while remaining_value > 10*COIN:
|
|
|
|
remaining_value -= 1*COIN
|
|
|
|
tx = CTransaction([CTxIn(prevout, nSequence=0)],
|
|
|
|
[CTxOut(remaining_value, CScript([1]))])
|
|
|
|
txid = self.proxy.sendrawtransaction(tx, True)
|
|
|
|
chain_txids.append(txid)
|
|
|
|
prevout = COutPoint(txid, 0)
|
|
|
|
|
|
|
|
# Whether the double-spend is allowed is evaluated by including all
|
|
|
|
# child fees - 40 BTC - so this attempt is rejected.
|
|
|
|
dbl_tx = CTransaction([CTxIn(tx0_outpoint, nSequence=0)],
|
|
|
|
[CTxOut(initial_nValue - 30*COIN, CScript([1]))])
|
|
|
|
|
|
|
|
try:
|
|
|
|
self.proxy.sendrawtransaction(dbl_tx, True)
|
|
|
|
except bitcoin.rpc.JSONRPCException as exp:
|
|
|
|
self.assertEqual(exp.error['code'], -26) # insufficient fee
|
|
|
|
else:
|
|
|
|
self.fail()
|
|
|
|
|
|
|
|
# Accepted with sufficient fee
|
|
|
|
dbl_tx = CTransaction([CTxIn(tx0_outpoint, nSequence=0)],
|
|
|
|
[CTxOut(1*COIN, CScript([1]))])
|
|
|
|
self.proxy.sendrawtransaction(dbl_tx, True)
|
|
|
|
|
|
|
|
for doublespent_txid in chain_txids:
|
|
|
|
with self.assertRaises(IndexError):
|
|
|
|
self.proxy.getrawtransaction(doublespent_txid)
|
|
|
|
|
|
|
|
def test_doublespend_tree(self):
|
|
|
|
"""Doublespend of a big tree of transactions"""
|
|
|
|
|
|
|
|
initial_nValue = 50*COIN
|
|
|
|
tx0_outpoint = self.make_txout(initial_nValue)
|
|
|
|
|
|
|
|
def branch(prevout, initial_value, max_txs, *, tree_width=5, fee=0.0001*COIN, _total_txs=None):
|
|
|
|
if _total_txs is None:
|
|
|
|
_total_txs = [0]
|
|
|
|
if _total_txs[0] >= max_txs:
|
|
|
|
return
|
|
|
|
|
|
|
|
txout_value = (initial_value - fee) // tree_width
|
|
|
|
if txout_value < fee:
|
|
|
|
return
|
|
|
|
|
|
|
|
vout = [CTxOut(txout_value, CScript([i+1]))
|
|
|
|
for i in range(tree_width)]
|
|
|
|
tx = CTransaction([CTxIn(prevout, nSequence=0)],
|
|
|
|
vout)
|
|
|
|
|
|
|
|
self.assertTrue(len(tx.serialize()) < 100000)
|
|
|
|
txid = self.proxy.sendrawtransaction(tx, True)
|
|
|
|
yield tx
|
|
|
|
_total_txs[0] += 1
|
|
|
|
|
|
|
|
for i, txout in enumerate(tx.vout):
|
|
|
|
yield from branch(COutPoint(txid, i), txout_value,
|
|
|
|
max_txs,
|
|
|
|
tree_width=tree_width, fee=fee,
|
|
|
|
_total_txs=_total_txs)
|
|
|
|
|
|
|
|
fee = 0.0001*COIN
|
|
|
|
n = MAX_REPLACEMENT_LIMIT
|
|
|
|
tree_txs = list(branch(tx0_outpoint, initial_nValue, n, fee=fee))
|
|
|
|
self.assertEqual(len(tree_txs), n)
|
|
|
|
|
|
|
|
# Attempt double-spend, will fail because too little fee paid
|
|
|
|
dbl_tx = CTransaction([CTxIn(tx0_outpoint, nSequence=0)],
|
|
|
|
[CTxOut(initial_nValue - fee*n, CScript([1]))])
|
|
|
|
try:
|
|
|
|
self.proxy.sendrawtransaction(dbl_tx, True)
|
|
|
|
except bitcoin.rpc.JSONRPCException as exp:
|
|
|
|
self.assertEqual(exp.error['code'], -26) # insufficient fee
|
|
|
|
else:
|
|
|
|
self.fail()
|
|
|
|
|
|
|
|
# 1 BTC fee is enough
|
|
|
|
dbl_tx = CTransaction([CTxIn(tx0_outpoint, nSequence=0)],
|
|
|
|
[CTxOut(initial_nValue - fee*n - 1*COIN, CScript([1]))])
|
|
|
|
self.proxy.sendrawtransaction(dbl_tx, True)
|
|
|
|
|
|
|
|
for tx in tree_txs:
|
|
|
|
with self.assertRaises(IndexError):
|
|
|
|
self.proxy.getrawtransaction(tx.GetHash())
|
|
|
|
|
|
|
|
# Try again, but with more total transactions than the "max txs
|
|
|
|
# double-spent at once" anti-DoS limit.
|
|
|
|
for n in (MAX_REPLACEMENT_LIMIT, MAX_REPLACEMENT_LIMIT*2):
|
|
|
|
fee = 0.0001*COIN
|
|
|
|
tx0_outpoint = self.make_txout(initial_nValue)
|
|
|
|
tree_txs = list(branch(tx0_outpoint, initial_nValue, n, fee=fee))
|
|
|
|
self.assertEqual(len(tree_txs), n)
|
|
|
|
|
|
|
|
dbl_tx = CTransaction([CTxIn(tx0_outpoint, nSequence=0)],
|
|
|
|
[CTxOut(initial_nValue - fee*n, CScript([1]))])
|
|
|
|
try:
|
|
|
|
self.proxy.sendrawtransaction(dbl_tx, True)
|
|
|
|
except bitcoin.rpc.JSONRPCException as exp:
|
|
|
|
self.assertEqual(exp.error['code'], -26)
|
|
|
|
else:
|
|
|
|
self.fail()
|
|
|
|
|
|
|
|
for tx in tree_txs:
|
|
|
|
self.proxy.getrawtransaction(tx.GetHash())
|
|
|
|
|
|
|
|
def test_replacement_feeperkb(self):
|
|
|
|
"""Replacement requires fee-per-KB to be higher"""
|
|
|
|
tx0_outpoint = self.make_txout(1.1*COIN)
|
|
|
|
|
|
|
|
tx1a = CTransaction([CTxIn(tx0_outpoint, nSequence=0)],
|
|
|
|
[CTxOut(1*COIN, CScript([b'a']))])
|
|
|
|
tx1a_txid = self.proxy.sendrawtransaction(tx1a, True)
|
|
|
|
|
|
|
|
# Higher fee, but the fee per KB is much lower, so the replacement is
|
|
|
|
# rejected.
|
|
|
|
tx1b = CTransaction([CTxIn(tx0_outpoint, nSequence=0)],
|
|
|
|
[CTxOut(0.001*COIN,
|
|
|
|
CScript([b'a'*999000]))])
|
|
|
|
|
|
|
|
try:
|
|
|
|
tx1b_txid = self.proxy.sendrawtransaction(tx1b, True)
|
|
|
|
except bitcoin.rpc.JSONRPCException as exp:
|
|
|
|
self.assertEqual(exp.error['code'], -26) # insufficient fee
|
|
|
|
else:
|
|
|
|
self.fail()
|
|
|
|
|
|
|
|
def test_spends_of_conflicting_outputs(self):
|
|
|
|
"""Replacements that spend conflicting tx outputs are rejected"""
|
|
|
|
utxo1 = self.make_txout(1.2*COIN)
|
|
|
|
utxo2 = self.make_txout(3.0*COIN)
|
|
|
|
|
|
|
|
tx1a = CTransaction([CTxIn(utxo1, nSequence=0)],
|
|
|
|
[CTxOut(1.1*COIN, CScript([b'a']))])
|
|
|
|
tx1a_txid = self.proxy.sendrawtransaction(tx1a, True)
|
|
|
|
|
|
|
|
# Direct spend an output of the transaction we're replacing.
|
|
|
|
tx2 = CTransaction([CTxIn(utxo1, nSequence=0), CTxIn(utxo2, nSequence=0),
|
|
|
|
CTxIn(COutPoint(tx1a_txid, 0), nSequence=0)],
|
|
|
|
tx1a.vout)
|
|
|
|
|
|
|
|
try:
|
|
|
|
tx2_txid = self.proxy.sendrawtransaction(tx2, True)
|
|
|
|
except bitcoin.rpc.JSONRPCException as exp:
|
|
|
|
self.assertEqual(exp.error['code'], -26)
|
|
|
|
else:
|
|
|
|
self.fail()
|
|
|
|
|
|
|
|
# Spend tx1a's output to test the indirect case.
|
|
|
|
tx1b = CTransaction([CTxIn(COutPoint(tx1a_txid, 0), nSequence=0)],
|
|
|
|
[CTxOut(1.0*COIN, CScript([b'a']))])
|
|
|
|
tx1b_txid = self.proxy.sendrawtransaction(tx1b, True)
|
|
|
|
|
|
|
|
tx2 = CTransaction([CTxIn(utxo1, nSequence=0), CTxIn(utxo2, nSequence=0),
|
|
|
|
CTxIn(COutPoint(tx1b_txid, 0))],
|
|
|
|
tx1a.vout)
|
|
|
|
|
|
|
|
try:
|
|
|
|
tx2_txid = self.proxy.sendrawtransaction(tx2, True)
|
|
|
|
except bitcoin.rpc.JSONRPCException as exp:
|
|
|
|
self.assertEqual(exp.error['code'], -26)
|
|
|
|
else:
|
|
|
|
self.fail()
|
|
|
|
|
|
|
|
def test_new_unconfirmed_inputs(self):
|
|
|
|
"""Replacements that add new unconfirmed inputs are rejected"""
|
|
|
|
confirmed_utxo = self.make_txout(1.1*COIN)
|
|
|
|
unconfirmed_utxo = self.make_txout(0.1*COIN, False)
|
|
|
|
|
|
|
|
tx1 = CTransaction([CTxIn(confirmed_utxo)],
|
|
|
|
[CTxOut(1.0*COIN, CScript([b'a']))])
|
|
|
|
tx1_txid = self.proxy.sendrawtransaction(tx1, True)
|
|
|
|
|
|
|
|
tx2 = CTransaction([CTxIn(confirmed_utxo), CTxIn(unconfirmed_utxo)],
|
|
|
|
tx1.vout)
|
|
|
|
|
|
|
|
try:
|
|
|
|
tx2_txid = self.proxy.sendrawtransaction(tx2, True)
|
|
|
|
except bitcoin.rpc.JSONRPCException as exp:
|
|
|
|
self.assertEqual(exp.error['code'], -26)
|
|
|
|
else:
|
|
|
|
self.fail()
|
|
|
|
|
|
|
|
if __name__ == '__main__':
|
|
|
|
unittest.main()
|