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litecoin/test/functional/feature_rbf.py

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#!/usr/bin/env python3
# Copyright (c) 2014-2021 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 RBF code."""
from copy import deepcopy
from decimal import Decimal
from test_framework.messages import (
BIP125_SEQUENCE_NUMBER,
COIN,
COutPoint,
CTransaction,
CTxIn,
CTxOut,
)
from test_framework.script import CScript, OP_DROP
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import (
assert_equal,
assert_raises_rpc_error,
)
from test_framework.script_util import (
DUMMY_P2WPKH_SCRIPT,
DUMMY_2_P2WPKH_SCRIPT,
)
from test_framework.wallet import MiniWallet
from test_framework.address import ADDRESS_BCRT1_UNSPENDABLE
MAX_REPLACEMENT_LIMIT = 100
class ReplaceByFeeTest(BitcoinTestFramework):
def set_test_params(self):
self.num_nodes = 1
self.extra_args = [
[
"-acceptnonstdtxn=1",
"-maxorphantx=1000",
"-limitancestorcount=50",
"-limitancestorsize=101",
"-limitdescendantcount=200",
"-limitdescendantsize=101",
],
]
self.supports_cli = False
def run_test(self):
self.wallet = MiniWallet(self.nodes[0])
# the pre-mined test framework chain contains coinbase outputs to the
# MiniWallet's default address in blocks 76-100 (see method
# BitcoinTestFramework._initialize_chain())
self.wallet.rescan_utxos()
self.log.info("Running test simple doublespend...")
self.test_simple_doublespend()
self.log.info("Running test doublespend chain...")
self.test_doublespend_chain()
self.log.info("Running test doublespend tree...")
self.test_doublespend_tree()
self.log.info("Running test replacement feeperkb...")
self.test_replacement_feeperkb()
self.log.info("Running test spends of conflicting outputs...")
self.test_spends_of_conflicting_outputs()
self.log.info("Running test new unconfirmed inputs...")
self.test_new_unconfirmed_inputs()
self.log.info("Running test too many replacements...")
self.test_too_many_replacements()
self.log.info("Running test opt-in...")
self.test_opt_in()
self.log.info("Running test RPC...")
self.test_rpc()
self.log.info("Running test prioritised transactions...")
self.test_prioritised_transactions()
self.log.info("Running test no inherited signaling...")
self.test_no_inherited_signaling()
self.log.info("Running test replacement relay fee...")
self.test_replacement_relay_fee()
self.log.info("Passed")
def make_utxo(self, node, amount, confirmed=True, scriptPubKey=DUMMY_P2WPKH_SCRIPT):
"""Create a txout with a given amount and scriptPubKey
confirmed - txouts created will be confirmed in the blockchain;
unconfirmed otherwise.
"""
txid, n = self.wallet.send_to(from_node=node, scriptPubKey=scriptPubKey, amount=amount)
# If requested, ensure txouts are confirmed.
if confirmed:
mempool_size = len(node.getrawmempool())
while mempool_size > 0:
self.generate(node, 1)
new_size = len(node.getrawmempool())
# Error out if we have something stuck in the mempool, as this
# would likely be a bug.
assert new_size < mempool_size
mempool_size = new_size
return COutPoint(int(txid, 16), n)
def test_simple_doublespend(self):
"""Simple doublespend"""
# we use MiniWallet to create a transaction template with inputs correctly set,
# and modify the output (amount, scriptPubKey) according to our needs
tx_template = self.wallet.create_self_transfer(from_node=self.nodes[0])['tx']
tx1a = deepcopy(tx_template)
tx1a.vout = [CTxOut(1 * COIN, DUMMY_P2WPKH_SCRIPT)]
tx1a_hex = tx1a.serialize().hex()
tx1a_txid = self.nodes[0].sendrawtransaction(tx1a_hex, 0)
# Should fail because we haven't changed the fee
tx1b = deepcopy(tx_template)
tx1b.vout = [CTxOut(1 * COIN, DUMMY_2_P2WPKH_SCRIPT)]
tx1b_hex = tx1b.serialize().hex()
# This will raise an exception due to insufficient fee
assert_raises_rpc_error(-26, "insufficient fee", self.nodes[0].sendrawtransaction, tx1b_hex, 0)
# Extra 0.1 BTC fee
tx1b.vout[0].nValue -= int(0.1 * COIN)
tx1b_hex = tx1b.serialize().hex()
# Works when enabled
tx1b_txid = self.nodes[0].sendrawtransaction(tx1b_hex, 0)
mempool = self.nodes[0].getrawmempool()
assert tx1a_txid not in mempool
assert tx1b_txid in mempool
assert_equal(tx1b_hex, self.nodes[0].getrawtransaction(tx1b_txid))
def test_doublespend_chain(self):
"""Doublespend of a long chain"""
initial_nValue = 5 * COIN
tx0_outpoint = self.make_utxo(self.nodes[0], initial_nValue)
prevout = tx0_outpoint
remaining_value = initial_nValue
chain_txids = []
while remaining_value > 1 * COIN:
remaining_value -= int(0.1 * COIN)
tx = CTransaction()
tx.vin = [CTxIn(prevout, nSequence=0)]
tx.vout = [CTxOut(remaining_value, CScript([1, OP_DROP] * 15 + [1]))]
tx_hex = tx.serialize().hex()
txid = self.nodes[0].sendrawtransaction(tx_hex, 0)
chain_txids.append(txid)
prevout = COutPoint(int(txid, 16), 0)
# Whether the double-spend is allowed is evaluated by including all
# child fees - 4 BTC - so this attempt is rejected.
dbl_tx = CTransaction()
dbl_tx.vin = [CTxIn(tx0_outpoint, nSequence=0)]
dbl_tx.vout = [CTxOut(initial_nValue - 3 * COIN, DUMMY_P2WPKH_SCRIPT)]
dbl_tx_hex = dbl_tx.serialize().hex()
# This will raise an exception due to insufficient fee
assert_raises_rpc_error(-26, "insufficient fee", self.nodes[0].sendrawtransaction, dbl_tx_hex, 0)
# Accepted with sufficient fee
dbl_tx = CTransaction()
dbl_tx.vin = [CTxIn(tx0_outpoint, nSequence=0)]
dbl_tx.vout = [CTxOut(int(0.1 * COIN), DUMMY_P2WPKH_SCRIPT)]
dbl_tx_hex = dbl_tx.serialize().hex()
self.nodes[0].sendrawtransaction(dbl_tx_hex, 0)
mempool = self.nodes[0].getrawmempool()
for doublespent_txid in chain_txids:
assert doublespent_txid not in mempool
def test_doublespend_tree(self):
"""Doublespend of a big tree of transactions"""
initial_nValue = 5 * COIN
tx0_outpoint = self.make_utxo(self.nodes[0], initial_nValue)
def branch(prevout, initial_value, max_txs, tree_width=5, fee=0.00001 * 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()
tx.vin = [CTxIn(prevout, nSequence=0)]
tx.vout = vout
tx_hex = tx.serialize().hex()
assert len(tx.serialize()) < 100000
txid = self.nodes[0].sendrawtransaction(tx_hex, 0)
yield tx
_total_txs[0] += 1
txid = int(txid, 16)
for i, txout in enumerate(tx.vout):
for x in branch(COutPoint(txid, i), txout_value,
max_txs,
tree_width=tree_width, fee=fee,
_total_txs=_total_txs):
yield x
fee = int(0.00001 * COIN)
n = MAX_REPLACEMENT_LIMIT
tree_txs = list(branch(tx0_outpoint, initial_nValue, n, fee=fee))
assert_equal(len(tree_txs), n)
# Attempt double-spend, will fail because too little fee paid
dbl_tx = CTransaction()
dbl_tx.vin = [CTxIn(tx0_outpoint, nSequence=0)]
dbl_tx.vout = [CTxOut(initial_nValue - fee * n, DUMMY_P2WPKH_SCRIPT)]
dbl_tx_hex = dbl_tx.serialize().hex()
# This will raise an exception due to insufficient fee
assert_raises_rpc_error(-26, "insufficient fee", self.nodes[0].sendrawtransaction, dbl_tx_hex, 0)
# 0.1 BTC fee is enough
dbl_tx = CTransaction()
dbl_tx.vin = [CTxIn(tx0_outpoint, nSequence=0)]
dbl_tx.vout = [CTxOut(initial_nValue - fee * n - int(0.1 * COIN), DUMMY_P2WPKH_SCRIPT)]
dbl_tx_hex = dbl_tx.serialize().hex()
self.nodes[0].sendrawtransaction(dbl_tx_hex, 0)
mempool = self.nodes[0].getrawmempool()
for tx in tree_txs:
tx.rehash()
assert tx.hash not in mempool
# Try again, but with more total transactions than the "max txs
# double-spent at once" anti-DoS limit.
for n in (MAX_REPLACEMENT_LIMIT + 1, MAX_REPLACEMENT_LIMIT * 2):
fee = int(0.00001 * COIN)
tx0_outpoint = self.make_utxo(self.nodes[0], initial_nValue)
tree_txs = list(branch(tx0_outpoint, initial_nValue, n, fee=fee))
assert_equal(len(tree_txs), n)
dbl_tx = CTransaction()
dbl_tx.vin = [CTxIn(tx0_outpoint, nSequence=0)]
dbl_tx.vout = [CTxOut(initial_nValue - 2 * fee * n, DUMMY_P2WPKH_SCRIPT)]
dbl_tx_hex = dbl_tx.serialize().hex()
# This will raise an exception
assert_raises_rpc_error(-26, "too many potential replacements", self.nodes[0].sendrawtransaction, dbl_tx_hex, 0)
for tx in tree_txs:
tx.rehash()
self.nodes[0].getrawtransaction(tx.hash)
def test_replacement_feeperkb(self):
"""Replacement requires fee-per-KB to be higher"""
tx0_outpoint = self.make_utxo(self.nodes[0], int(1.1 * COIN))
tx1a = CTransaction()
tx1a.vin = [CTxIn(tx0_outpoint, nSequence=0)]
tx1a.vout = [CTxOut(1 * COIN, DUMMY_P2WPKH_SCRIPT)]
tx1a_hex = tx1a.serialize().hex()
self.nodes[0].sendrawtransaction(tx1a_hex, 0)
# Higher fee, but the fee per KB is much lower, so the replacement is
# rejected.
tx1b = CTransaction()
tx1b.vin = [CTxIn(tx0_outpoint, nSequence=0)]
tx1b.vout = [CTxOut(int(0.001 * COIN), CScript([b'a' * 999000]))]
tx1b_hex = tx1b.serialize().hex()
# This will raise an exception due to insufficient fee
assert_raises_rpc_error(-26, "insufficient fee", self.nodes[0].sendrawtransaction, tx1b_hex, 0)
def test_spends_of_conflicting_outputs(self):
"""Replacements that spend conflicting tx outputs are rejected"""
utxo1 = self.make_utxo(self.nodes[0], int(1.2 * COIN))
utxo2 = self.make_utxo(self.nodes[0], 3 * COIN)
tx1a = CTransaction()
tx1a.vin = [CTxIn(utxo1, nSequence=0)]
tx1a.vout = [CTxOut(int(1.1 * COIN), DUMMY_P2WPKH_SCRIPT)]
tx1a_hex = tx1a.serialize().hex()
tx1a_txid = self.nodes[0].sendrawtransaction(tx1a_hex, 0)
tx1a_txid = int(tx1a_txid, 16)
# Direct spend an output of the transaction we're replacing.
tx2 = CTransaction()
tx2.vin = [CTxIn(utxo1, nSequence=0), CTxIn(utxo2, nSequence=0)]
tx2.vin.append(CTxIn(COutPoint(tx1a_txid, 0), nSequence=0))
tx2.vout = tx1a.vout
tx2_hex = tx2.serialize().hex()
# This will raise an exception
assert_raises_rpc_error(-26, "bad-txns-spends-conflicting-tx", self.nodes[0].sendrawtransaction, tx2_hex, 0)
# Spend tx1a's output to test the indirect case.
tx1b = CTransaction()
tx1b.vin = [CTxIn(COutPoint(tx1a_txid, 0), nSequence=0)]
tx1b.vout = [CTxOut(1 * COIN, DUMMY_P2WPKH_SCRIPT)]
tx1b_hex = tx1b.serialize().hex()
tx1b_txid = self.nodes[0].sendrawtransaction(tx1b_hex, 0)
tx1b_txid = int(tx1b_txid, 16)
tx2 = CTransaction()
tx2.vin = [CTxIn(utxo1, nSequence=0), CTxIn(utxo2, nSequence=0),
CTxIn(COutPoint(tx1b_txid, 0))]
tx2.vout = tx1a.vout
tx2_hex = tx2.serialize().hex()
# This will raise an exception
assert_raises_rpc_error(-26, "bad-txns-spends-conflicting-tx", self.nodes[0].sendrawtransaction, tx2_hex, 0)
def test_new_unconfirmed_inputs(self):
"""Replacements that add new unconfirmed inputs are rejected"""
confirmed_utxo = self.make_utxo(self.nodes[0], int(1.1 * COIN))
unconfirmed_utxo = self.make_utxo(self.nodes[0], int(0.1 * COIN), False)
tx1 = CTransaction()
tx1.vin = [CTxIn(confirmed_utxo)]
tx1.vout = [CTxOut(1 * COIN, DUMMY_P2WPKH_SCRIPT)]
tx1_hex = tx1.serialize().hex()
self.nodes[0].sendrawtransaction(tx1_hex, 0)
tx2 = CTransaction()
tx2.vin = [CTxIn(confirmed_utxo), CTxIn(unconfirmed_utxo)]
tx2.vout = tx1.vout
tx2_hex = tx2.serialize().hex()
# This will raise an exception
assert_raises_rpc_error(-26, "replacement-adds-unconfirmed", self.nodes[0].sendrawtransaction, tx2_hex, 0)
def test_too_many_replacements(self):
"""Replacements that evict too many transactions are rejected"""
# Try directly replacing more than MAX_REPLACEMENT_LIMIT
# transactions
# Start by creating a single transaction with many outputs
initial_nValue = 10 * COIN
utxo = self.make_utxo(self.nodes[0], initial_nValue)
fee = int(0.0001 * COIN)
split_value = int((initial_nValue - fee) / (MAX_REPLACEMENT_LIMIT + 1))
outputs = []
for _ in range(MAX_REPLACEMENT_LIMIT + 1):
outputs.append(CTxOut(split_value, CScript([1])))
splitting_tx = CTransaction()
splitting_tx.vin = [CTxIn(utxo, nSequence=0)]
splitting_tx.vout = outputs
splitting_tx_hex = splitting_tx.serialize().hex()
txid = self.nodes[0].sendrawtransaction(splitting_tx_hex, 0)
txid = int(txid, 16)
# Now spend each of those outputs individually
for i in range(MAX_REPLACEMENT_LIMIT + 1):
tx_i = CTransaction()
tx_i.vin = [CTxIn(COutPoint(txid, i), nSequence=0)]
tx_i.vout = [CTxOut(split_value - fee, DUMMY_P2WPKH_SCRIPT)]
tx_i_hex = tx_i.serialize().hex()
self.nodes[0].sendrawtransaction(tx_i_hex, 0)
# Now create doublespend of the whole lot; should fail.
# Need a big enough fee to cover all spending transactions and have
# a higher fee rate
double_spend_value = (split_value - 100 * fee) * (MAX_REPLACEMENT_LIMIT + 1)
inputs = []
for i in range(MAX_REPLACEMENT_LIMIT + 1):
inputs.append(CTxIn(COutPoint(txid, i), nSequence=0))
double_tx = CTransaction()
double_tx.vin = inputs
double_tx.vout = [CTxOut(double_spend_value, CScript([b'a']))]
double_tx_hex = double_tx.serialize().hex()
# This will raise an exception
assert_raises_rpc_error(-26, "too many potential replacements", self.nodes[0].sendrawtransaction, double_tx_hex, 0)
# If we remove an input, it should pass
double_tx = CTransaction()
double_tx.vin = inputs[0:-1]
double_tx.vout = [CTxOut(double_spend_value, CScript([b'a']))]
double_tx_hex = double_tx.serialize().hex()
self.nodes[0].sendrawtransaction(double_tx_hex, 0)
def test_opt_in(self):
"""Replacing should only work if orig tx opted in"""
tx0_outpoint = self.make_utxo(self.nodes[0], int(1.1 * COIN))
# Create a non-opting in transaction
tx1a = CTransaction()
tx1a.vin = [CTxIn(tx0_outpoint, nSequence=0xffffffff)]
tx1a.vout = [CTxOut(1 * COIN, DUMMY_P2WPKH_SCRIPT)]
tx1a_hex = tx1a.serialize().hex()
tx1a_txid = self.nodes[0].sendrawtransaction(tx1a_hex, 0)
# This transaction isn't shown as replaceable
assert_equal(self.nodes[0].getmempoolentry(tx1a_txid)['bip125-replaceable'], False)
# Shouldn't be able to double-spend
tx1b = CTransaction()
tx1b.vin = [CTxIn(tx0_outpoint, nSequence=0)]
tx1b.vout = [CTxOut(int(0.9 * COIN), DUMMY_P2WPKH_SCRIPT)]
tx1b_hex = tx1b.serialize().hex()
# This will raise an exception
assert_raises_rpc_error(-26, "txn-mempool-conflict", self.nodes[0].sendrawtransaction, tx1b_hex, 0)
tx1_outpoint = self.make_utxo(self.nodes[0], int(1.1 * COIN))
# Create a different non-opting in transaction
tx2a = CTransaction()
tx2a.vin = [CTxIn(tx1_outpoint, nSequence=0xfffffffe)]
tx2a.vout = [CTxOut(1 * COIN, DUMMY_P2WPKH_SCRIPT)]
tx2a_hex = tx2a.serialize().hex()
tx2a_txid = self.nodes[0].sendrawtransaction(tx2a_hex, 0)
# Still shouldn't be able to double-spend
tx2b = CTransaction()
tx2b.vin = [CTxIn(tx1_outpoint, nSequence=0)]
tx2b.vout = [CTxOut(int(0.9 * COIN), DUMMY_P2WPKH_SCRIPT)]
tx2b_hex = tx2b.serialize().hex()
# This will raise an exception
assert_raises_rpc_error(-26, "txn-mempool-conflict", self.nodes[0].sendrawtransaction, tx2b_hex, 0)
# Now create a new transaction that spends from tx1a and tx2a
# opt-in on one of the inputs
# Transaction should be replaceable on either input
tx1a_txid = int(tx1a_txid, 16)
tx2a_txid = int(tx2a_txid, 16)
tx3a = CTransaction()
tx3a.vin = [CTxIn(COutPoint(tx1a_txid, 0), nSequence=0xffffffff),
CTxIn(COutPoint(tx2a_txid, 0), nSequence=0xfffffffd)]
tx3a.vout = [CTxOut(int(0.9 * COIN), CScript([b'c'])), CTxOut(int(0.9 * COIN), CScript([b'd']))]
tx3a_hex = tx3a.serialize().hex()
tx3a_txid = self.nodes[0].sendrawtransaction(tx3a_hex, 0)
# This transaction is shown as replaceable
assert_equal(self.nodes[0].getmempoolentry(tx3a_txid)['bip125-replaceable'], True)
tx3b = CTransaction()
tx3b.vin = [CTxIn(COutPoint(tx1a_txid, 0), nSequence=0)]
tx3b.vout = [CTxOut(int(0.5 * COIN), DUMMY_P2WPKH_SCRIPT)]
tx3b_hex = tx3b.serialize().hex()
tx3c = CTransaction()
tx3c.vin = [CTxIn(COutPoint(tx2a_txid, 0), nSequence=0)]
tx3c.vout = [CTxOut(int(0.5 * COIN), DUMMY_P2WPKH_SCRIPT)]
tx3c_hex = tx3c.serialize().hex()
self.nodes[0].sendrawtransaction(tx3b_hex, 0)
# If tx3b was accepted, tx3c won't look like a replacement,
# but make sure it is accepted anyway
self.nodes[0].sendrawtransaction(tx3c_hex, 0)
def test_prioritised_transactions(self):
# Ensure that fee deltas used via prioritisetransaction are
# correctly used by replacement logic
# 1. Check that feeperkb uses modified fees
tx0_outpoint = self.make_utxo(self.nodes[0], int(1.1 * COIN))
tx1a = CTransaction()
tx1a.vin = [CTxIn(tx0_outpoint, nSequence=0)]
tx1a.vout = [CTxOut(1 * COIN, DUMMY_P2WPKH_SCRIPT)]
tx1a_hex = tx1a.serialize().hex()
tx1a_txid = self.nodes[0].sendrawtransaction(tx1a_hex, 0)
# Higher fee, but the actual fee per KB is much lower.
tx1b = CTransaction()
tx1b.vin = [CTxIn(tx0_outpoint, nSequence=0)]
tx1b.vout = [CTxOut(int(0.001 * COIN), CScript([b'a' * 740000]))]
tx1b_hex = tx1b.serialize().hex()
# Verify tx1b cannot replace tx1a.
assert_raises_rpc_error(-26, "insufficient fee", self.nodes[0].sendrawtransaction, tx1b_hex, 0)
# Use prioritisetransaction to set tx1a's fee to 0.
self.nodes[0].prioritisetransaction(txid=tx1a_txid, fee_delta=int(-0.1 * COIN))
# Now tx1b should be able to replace tx1a
tx1b_txid = self.nodes[0].sendrawtransaction(tx1b_hex, 0)
assert tx1b_txid in self.nodes[0].getrawmempool()
# 2. Check that absolute fee checks use modified fee.
tx1_outpoint = self.make_utxo(self.nodes[0], int(1.1 * COIN))
tx2a = CTransaction()
tx2a.vin = [CTxIn(tx1_outpoint, nSequence=0)]
tx2a.vout = [CTxOut(1 * COIN, DUMMY_P2WPKH_SCRIPT)]
tx2a_hex = tx2a.serialize().hex()
self.nodes[0].sendrawtransaction(tx2a_hex, 0)
# Lower fee, but we'll prioritise it
tx2b = CTransaction()
tx2b.vin = [CTxIn(tx1_outpoint, nSequence=0)]
tx2b.vout = [CTxOut(int(1.01 * COIN), DUMMY_P2WPKH_SCRIPT)]
tx2b.rehash()
tx2b_hex = tx2b.serialize().hex()
# Verify tx2b cannot replace tx2a.
assert_raises_rpc_error(-26, "insufficient fee", self.nodes[0].sendrawtransaction, tx2b_hex, 0)
# Now prioritise tx2b to have a higher modified fee
self.nodes[0].prioritisetransaction(txid=tx2b.hash, fee_delta=int(0.1 * COIN))
# tx2b should now be accepted
tx2b_txid = self.nodes[0].sendrawtransaction(tx2b_hex, 0)
assert tx2b_txid in self.nodes[0].getrawmempool()
def test_rpc(self):
us0 = self.wallet.get_utxo()
ins = [us0]
outs = {ADDRESS_BCRT1_UNSPENDABLE: Decimal(1.0000000)}
rawtx0 = self.nodes[0].createrawtransaction(ins, outs, 0, True)
rawtx1 = self.nodes[0].createrawtransaction(ins, outs, 0, False)
json0 = self.nodes[0].decoderawtransaction(rawtx0)
json1 = self.nodes[0].decoderawtransaction(rawtx1)
assert_equal(json0["vin"][0]["sequence"], 4294967293)
assert_equal(json1["vin"][0]["sequence"], 4294967295)
if self.is_specified_wallet_compiled():
self.init_wallet(node=0)
rawtx2 = self.nodes[0].createrawtransaction([], outs)
frawtx2a = self.nodes[0].fundrawtransaction(rawtx2, {"replaceable": True})
frawtx2b = self.nodes[0].fundrawtransaction(rawtx2, {"replaceable": False})
json0 = self.nodes[0].decoderawtransaction(frawtx2a['hex'])
json1 = self.nodes[0].decoderawtransaction(frawtx2b['hex'])
assert_equal(json0["vin"][0]["sequence"], 4294967293)
assert_equal(json1["vin"][0]["sequence"], 4294967294)
def test_no_inherited_signaling(self):
confirmed_utxo = self.wallet.get_utxo()
# Create an explicitly opt-in parent transaction
optin_parent_tx = self.wallet.send_self_transfer(
from_node=self.nodes[0],
utxo_to_spend=confirmed_utxo,
sequence=BIP125_SEQUENCE_NUMBER,
fee_rate=Decimal('0.01'),
)
assert_equal(True, self.nodes[0].getmempoolentry(optin_parent_tx['txid'])['bip125-replaceable'])
replacement_parent_tx = self.wallet.create_self_transfer(
from_node=self.nodes[0],
utxo_to_spend=confirmed_utxo,
sequence=BIP125_SEQUENCE_NUMBER,
fee_rate=Decimal('0.02'),
)
# Test if parent tx can be replaced.
res = self.nodes[0].testmempoolaccept(rawtxs=[replacement_parent_tx['hex']])[0]
# Parent can be replaced.
assert_equal(res['allowed'], True)
# Create an opt-out child tx spending the opt-in parent
parent_utxo = self.wallet.get_utxo(txid=optin_parent_tx['txid'])
optout_child_tx = self.wallet.send_self_transfer(
from_node=self.nodes[0],
utxo_to_spend=parent_utxo,
sequence=0xffffffff,
fee_rate=Decimal('0.01'),
)
# Reports true due to inheritance
assert_equal(True, self.nodes[0].getmempoolentry(optout_child_tx['txid'])['bip125-replaceable'])
replacement_child_tx = self.wallet.create_self_transfer(
from_node=self.nodes[0],
utxo_to_spend=parent_utxo,
sequence=0xffffffff,
fee_rate=Decimal('0.02'),
mempool_valid=False,
)
# Broadcast replacement child tx
# BIP 125 :
# 1. The original transactions signal replaceability explicitly or through inheritance as described in the above
# Summary section.
# The original transaction (`optout_child_tx`) doesn't signal RBF but its parent (`optin_parent_tx`) does.
# The replacement transaction (`replacement_child_tx`) should be able to replace the original transaction.
# See CVE-2021-31876 for further explanations.
assert_equal(True, self.nodes[0].getmempoolentry(optin_parent_tx['txid'])['bip125-replaceable'])
assert_raises_rpc_error(-26, 'txn-mempool-conflict', self.nodes[0].sendrawtransaction, replacement_child_tx["hex"], 0)
self.log.info('Check that the child tx can still be replaced (via a tx that also replaces the parent)')
replacement_parent_tx = self.wallet.send_self_transfer(
from_node=self.nodes[0],
utxo_to_spend=confirmed_utxo,
sequence=0xffffffff,
fee_rate=Decimal('0.03'),
)
# Check that child is removed and update wallet utxo state
assert_raises_rpc_error(-5, 'Transaction not in mempool', self.nodes[0].getmempoolentry, optout_child_tx['txid'])
self.wallet.get_utxo(txid=optout_child_tx['txid'])
def test_replacement_relay_fee(self):
tx = self.wallet.send_self_transfer(from_node=self.nodes[0])['tx']
# Higher fee, higher feerate, different txid, but the replacement does not provide a relay
# fee conforming to node's `incrementalrelayfee` policy of 1000 sat per KB.
tx.vout[0].nValue -= 1
assert_raises_rpc_error(-26, "insufficient fee", self.nodes[0].sendrawtransaction, tx.serialize().hex())
if __name__ == '__main__':
ReplaceByFeeTest().main()
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