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#!/usr/bin/env python3
# Copyright (c) 2020-2021 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
"""Tests that a mempool transaction expires after a given timeout and that its
children are removed as well.
Both the default expiry timeout defined by DEFAULT_MEMPOOL_EXPIRY and a user
definable expiry timeout via the '-mempoolexpiry=<n>' command line argument
(<n> is the timeout in hours) are tested.
"""
from datetime import timedelta
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,
)
from test_framework.wallet import MiniWallet
DEFAULT_MEMPOOL_EXPIRY = 336 # hours
CUSTOM_MEMPOOL_EXPIRY = 10 # hours
class MempoolExpiryTest(BitcoinTestFramework):
def set_test_params(self):
self.num_nodes = 1
self.setup_clean_chain = True
def test_transaction_expiry(self, timeout):
"""Tests that a transaction expires after the expiry timeout and its
children are removed as well."""
node = self.nodes[0]
self.wallet = MiniWallet(node)
# Add enough mature utxos to the wallet so that all txs spend confirmed coins.
self.generate(self.wallet, 4)
self.generate(node, COINBASE_MATURITY)
# Send a parent transaction that will expire.
parent_txid = self.wallet.send_self_transfer(from_node=node)['txid']
parent_utxo = self.wallet.get_utxo(txid=parent_txid)
independent_utxo = self.wallet.get_utxo()
# Ensure the transactions we send to trigger the mempool check spend utxos that are independent of
# the transactions being tested for expiration.
trigger_utxo1 = self.wallet.get_utxo()
trigger_utxo2 = self.wallet.get_utxo()
# Set the mocktime to the arrival time of the parent transaction.
entry_time = node.getmempoolentry(parent_txid)['time']
node.setmocktime(entry_time)
# Let half of the timeout elapse and broadcast the child transaction spending the parent transaction.
half_expiry_time = entry_time + int(60 * 60 * timeout/2)
node.setmocktime(half_expiry_time)
child_txid = self.wallet.send_self_transfer(from_node=node, utxo_to_spend=parent_utxo)['txid']
assert_equal(parent_txid, node.getmempoolentry(child_txid)['depends'][0])
self.log.info('Broadcast child transaction after {} hours.'.format(
timedelta(seconds=(half_expiry_time-entry_time))))
# Broadcast another (independent) transaction.
independent_txid = self.wallet.send_self_transfer(from_node=node, utxo_to_spend=independent_utxo)['txid']
# Let most of the timeout elapse and check that the parent tx is still
# in the mempool.
nearly_expiry_time = entry_time + 60 * 60 * timeout - 5
node.setmocktime(nearly_expiry_time)
# Broadcast a transaction as the expiry of transactions in the mempool is only checked
# when a new transaction is added to the mempool.
self.wallet.send_self_transfer(from_node=node, utxo_to_spend=trigger_utxo1)
self.log.info('Test parent tx not expired after {} hours.'.format(
timedelta(seconds=(nearly_expiry_time-entry_time))))
assert_equal(entry_time, node.getmempoolentry(parent_txid)['time'])
# Transaction should be evicted from the mempool after the expiry time
# has passed.
expiry_time = entry_time + 60 * 60 * timeout + 5
node.setmocktime(expiry_time)
# Again, broadcast a transaction so the expiry of transactions in the mempool is checked.
self.wallet.send_self_transfer(from_node=node, utxo_to_spend=trigger_utxo2)
self.log.info('Test parent tx expiry after {} hours.'.format(
timedelta(seconds=(expiry_time-entry_time))))
assert_raises_rpc_error(-5, 'Transaction not in mempool',
node.getmempoolentry, parent_txid)
# The child transaction should be removed from the mempool as well.
self.log.info('Test child tx is evicted as well.')
assert_raises_rpc_error(-5, 'Transaction not in mempool',
node.getmempoolentry, child_txid)
# Check that the independent tx is still in the mempool.
self.log.info('Test the independent tx not expired after {} hours.'.format(
timedelta(seconds=(expiry_time-half_expiry_time))))
assert_equal(half_expiry_time, node.getmempoolentry(independent_txid)['time'])
def run_test(self):
self.log.info('Test default mempool expiry timeout of %d hours.' %
DEFAULT_MEMPOOL_EXPIRY)
self.test_transaction_expiry(DEFAULT_MEMPOOL_EXPIRY)
self.log.info('Test custom mempool expiry timeout of %d hours.' %
CUSTOM_MEMPOOL_EXPIRY)
self.restart_node(0, ['-mempoolexpiry=%d' % CUSTOM_MEMPOOL_EXPIRY])
self.test_transaction_expiry(CUSTOM_MEMPOOL_EXPIRY)
if __name__ == '__main__':
MempoolExpiryTest().main()
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