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#!/usr/bin/env python3
# Copyright (c) 2014-2022 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 test_framework.messages import (
DEFAULT_ANCESTOR_LIMIT,
)
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import (
assert_equal,
assert_raises_rpc_error,
)
from test_framework.wallet import MiniWallet
class MempoolPackagesTest(BitcoinTestFramework):
def set_test_params(self):
self.num_nodes = 1
def chain_tx(self, utxos_to_spend, *, num_outputs=1):
return self.wallet.send_self_transfer_multi(
from_node=self.nodes[0],
utxos_to_spend=utxos_to_spend,
num_outputs=num_outputs)['new_utxos']
def run_test(self):
self.wallet = MiniWallet(self.nodes[0])
# DEFAULT_ANCESTOR_LIMIT transactions off a confirmed tx should be fine
chain = []
utxo = self.wallet.get_utxo()
for _ in range(4):
utxo, utxo2 = self.chain_tx([utxo], num_outputs=2)
chain.append(utxo2)
for _ in range(DEFAULT_ANCESTOR_LIMIT - 4):
utxo, = self.chain_tx([utxo])
chain.append(utxo)
second_chain, = self.chain_tx([self.wallet.get_utxo(confirmed_only=True)])
# Check mempool has DEFAULT_ANCESTOR_LIMIT + 1 transactions in it
assert_equal(len(self.nodes[0].getrawmempool()), DEFAULT_ANCESTOR_LIMIT + 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]", self.chain_tx, [utxo])
# ... or 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", self.chain_tx, [chain[2]])
assert_raises_rpc_error(-26, "too-long-mempool-chain, too many descendants", self.chain_tx, [chain[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", self.chain_tx, [chain[0], second_chain])
# ...especially if its > 40k weight
assert_raises_rpc_error(-26, "too-long-mempool-chain, too many descendants", self.chain_tx, [chain[0]], num_outputs=350)
# ...even if it's submitted with other transactions
replaceable_tx = self.wallet.create_self_transfer_multi(utxos_to_spend=[chain[0]])
txns = [replaceable_tx["tx"], self.wallet.create_self_transfer_multi(utxos_to_spend=replaceable_tx["new_utxos"])["tx"]]
txns_hex = [tx.serialize().hex() for tx in txns]
assert_equal(self.nodes[0].testmempoolaccept(txns_hex)[0]["reject-reason"], "too-long-mempool-chain")
pkg_result = self.nodes[0].submitpackage(txns_hex)
assert "too-long-mempool-chain" in pkg_result["tx-results"][txns[0].getwtxid()]["error"]
assert_equal(pkg_result["tx-results"][txns[1].getwtxid()]["error"], "bad-txns-inputs-missingorspent")
# But not if it chains directly off the first transaction
self.nodes[0].sendrawtransaction(replaceable_tx["hex"])
# and the second chain should work just fine
self.chain_tx([second_chain])
# Ensure an individual transaction with single direct conflict can RBF the chain which used our carve-out rule
replacement_tx = replaceable_tx["tx"]
replacement_tx.vout[0].nValue -= 1000000
self.nodes[0].sendrawtransaction(replacement_tx.serialize().hex())
# Finally, check that we added two transactions
assert_equal(len(self.nodes[0].getrawmempool()), DEFAULT_ANCESTOR_LIMIT + 3)
if __name__ == '__main__':
MempoolPackagesTest().main()
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