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6a0627d073
d6d2602a32251c1017da88b47c801b7283c66ce3 add: test that transactions expire from mempool (0xb10c)
Pull request description:
This adds the functional test `mempool_expiry.py` covering mempool transaction expiry. Both the default `DEFAULT_MEMPOOL_EXPIRY` of 336 hours (two weeks, set in #9312) and the user definable mempool expiry via the `-mempoolexpiry=<n>` command line option are tested. The test checks that descendants of expired transactions are removed as well.
*Notes for reviewers*
- `LimitMempoolSize()` (which is the only caller of `CTxMemPool::Expire()`) is only called when a transaction is added to the mempool. In order to test expiry of a transaction-that-should-expire, the mocktime is set and a random transaction is broadcast to trigger `LimitMempoolSize()`. The transaction-that-should-expire is then checked for expiry. LMK if there is another way, but I don't think there is.
ACKs for top commit:
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Code review ACK d6d2602a32251c1017da88b47c801b7283c66ce3.
Tree-SHA512: eb68cd9e2d870872b8e8e1522fed8954fb99cc9e4edda4b28bb2a4e41cddbc53fe6f7d9c090f1e0e98ab49beb24bf37ff3787a9e9801a95e8ae9ca9eb34fe6f0
101 lines
4.2 KiB
Python
Executable File
101 lines
4.2 KiB
Python
Executable File
#!/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.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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find_vout_for_address,
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)
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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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def skip_test_if_missing_module(self):
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self.skip_if_no_wallet()
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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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# Send a parent transaction that will expire.
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parent_address = node.getnewaddress()
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parent_txid = node.sendtoaddress(parent_address, 1.0)
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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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# Create child transaction spending the parent transaction
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vout = find_vout_for_address(node, parent_txid, parent_address)
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inputs = [{'txid': parent_txid, 'vout': vout}]
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outputs = {node.getnewaddress(): 0.99}
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child_raw = node.createrawtransaction(inputs, outputs)
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child_signed = node.signrawtransactionwithwallet(child_raw)['hex']
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# Let half of the timeout elapse and broadcast the child 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 = node.sendrawtransaction(child_signed)
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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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# 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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# Expiry of mempool transactions is only checked when a new transaction
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# is added to the to the mempool.
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node.sendtoaddress(node.getnewaddress(), 1.0)
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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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# Expiry of mempool transactions is only checked when a new transaction
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# is added to the to the mempool.
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node.sendtoaddress(node.getnewaddress(), 1.0)
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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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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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