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