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#!/usr/bin/env python3
# Copyright (c) 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.
"""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.test_framework import BitcoinTestFramework
from test_framework.util import (
assert_equal,
assert_raises_rpc_error,
find_vout_for_address,
)
DEFAULT_MEMPOOL_EXPIRY = 336 # hours
CUSTOM_MEMPOOL_EXPIRY = 10 # hours
class MempoolExpiryTest(BitcoinTestFramework):
def set_test_params(self):
self.num_nodes = 1
def skip_test_if_missing_module(self):
self.skip_if_no_wallet()
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]
# Send a parent transaction that will expire.
parent_address = node.getnewaddress()
parent_txid = node.sendtoaddress(parent_address, 1.0)
# Set the mocktime to the arrival time of the parent transaction.
entry_time = node.getmempoolentry(parent_txid)['time']
node.setmocktime(entry_time)
# Create child transaction spending the parent transaction
vout = find_vout_for_address(node, parent_txid, parent_address)
inputs = [{'txid': parent_txid, 'vout': vout}]
outputs = {node.getnewaddress(): 0.99}
child_raw = node.createrawtransaction(inputs, outputs)
child_signed = node.signrawtransactionwithwallet(child_raw)['hex']
# Let half of the timeout elapse and broadcast the child transaction.
half_expiry_time = entry_time + int(60 * 60 * timeout/2)
node.setmocktime(half_expiry_time)
child_txid = node.sendrawtransaction(child_signed)
self.log.info('Broadcast child transaction after {} hours.'.format(
timedelta(seconds=(half_expiry_time-entry_time))))
# 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)
# Expiry of mempool transactions is only checked when a new transaction
# is added to the to the mempool.
node.sendtoaddress(node.getnewaddress(), 1.0)
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)
# Expiry of mempool transactions is only checked when a new transaction
# is added to the to the mempool.
node.sendtoaddress(node.getnewaddress(), 1.0)
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)
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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