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