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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 descendant package tracking carve-out allowing one final transaction in
an otherwise-full package as long as it has only one parent and is <= 10k in
size.
"""
from decimal import Decimal
from test_framework.blocktools import COINBASE_MATURITY
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import (
assert_equal,
assert_raises_rpc_error,
chain_transaction,
)
MAX_ANCESTORS = 25
MAX_DESCENDANTS = 25
class MempoolPackagesTest(BitcoinTestFramework):
def set_test_params(self):
self.num_nodes = 1
self.extra_args = [["-maxorphantx=1000"]]
def skip_test_if_missing_module(self):
self.skip_if_no_wallet()
def run_test(self):
# Mine some blocks and have them mature.
self.generate(self.nodes[0], COINBASE_MATURITY + 1)
utxo = self.nodes[0].listunspent(10)
txid = utxo[0]['txid']
vout = utxo[0]['vout']
value = utxo[0]['amount']
fee = Decimal("0.0002")
# MAX_ANCESTORS transactions off a confirmed tx should be fine
chain = []
for _ in range(4):
(txid, sent_value) = chain_transaction(self.nodes[0], [txid], [vout], value, fee, 2)
vout = 0
value = sent_value
chain.append([txid, value])
for _ in range(MAX_ANCESTORS - 4):
(txid, sent_value) = chain_transaction(self.nodes[0], [txid], [0], value, fee, 1)
value = sent_value
chain.append([txid, value])
(second_chain, second_chain_value) = chain_transaction(self.nodes[0], [utxo[1]['txid']], [utxo[1]['vout']], utxo[1]['amount'], fee, 1)
# Check mempool has MAX_ANCESTORS + 1 transactions in it
assert_equal(len(self.nodes[0].getrawmempool()), MAX_ANCESTORS + 1)
# Adding one more transaction on to the chain should fail.
assert_raises_rpc_error(-26, "too-long-mempool-chain, too many unconfirmed ancestors [limit: 25]", chain_transaction, self.nodes[0], [txid], [0], value, fee, 1)
# ...even if it chains on from some point in the middle of the chain.
assert_raises_rpc_error(-26, "too-long-mempool-chain, too many descendants", chain_transaction, self.nodes[0], [chain[2][0]], [1], chain[2][1], fee, 1)
assert_raises_rpc_error(-26, "too-long-mempool-chain, too many descendants", chain_transaction, self.nodes[0], [chain[1][0]], [1], chain[1][1], fee, 1)
# ...even if it chains on to two parent transactions with one in the chain.
assert_raises_rpc_error(-26, "too-long-mempool-chain, too many descendants", chain_transaction, self.nodes[0], [chain[0][0], second_chain], [1, 0], chain[0][1] + second_chain_value, fee, 1)
# ...especially if its > 40k weight
assert_raises_rpc_error(-26, "too-long-mempool-chain, too many descendants", chain_transaction, self.nodes[0], [chain[0][0]], [1], chain[0][1], fee, 350)
# But not if it chains directly off the first transaction
(replacable_txid, replacable_orig_value) = chain_transaction(self.nodes[0], [chain[0][0]], [1], chain[0][1], fee, 1)
# and the second chain should work just fine
chain_transaction(self.nodes[0], [second_chain], [0], second_chain_value, fee, 1)
# Make sure we can RBF the chain which used our carve-out rule
second_tx_outputs = {self.nodes[0].getrawtransaction(replacable_txid, True)["vout"][0]['scriptPubKey']['address']: replacable_orig_value - (Decimal(1) / Decimal(100))}
second_tx = self.nodes[0].createrawtransaction([{'txid': chain[0][0], 'vout': 1}], second_tx_outputs)
signed_second_tx = self.nodes[0].signrawtransactionwithwallet(second_tx)
self.nodes[0].sendrawtransaction(signed_second_tx['hex'])
# Finally, check that we added two transactions
assert_equal(len(self.nodes[0].getrawmempool()), MAX_ANCESTORS + 3)
if __name__ == '__main__':
MempoolPackagesTest().main()
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