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107 lines
5.0 KiB
107 lines
5.0 KiB
#!/usr/bin/env python3
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# Copyright (c) 2020-2022 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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"""Test mempool descendants/ancestors information update.
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Test mempool update of transaction descendants/ancestors information (count, size)
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when transactions have been re-added from a disconnected block to the mempool.
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"""
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from math import ceil
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import time
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from test_framework.test_framework import BitcoinTestFramework
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from test_framework.util import assert_equal
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from test_framework.wallet import MiniWallet
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class MempoolUpdateFromBlockTest(BitcoinTestFramework):
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def set_test_params(self):
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self.num_nodes = 1
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self.extra_args = [['-limitdescendantsize=1000', '-limitancestorsize=1000', '-limitancestorcount=100']]
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def transaction_graph_test(self, size, n_tx_to_mine=None, fee=100_000):
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"""Create an acyclic tournament (a type of directed graph) of transactions and use it for testing.
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Keyword arguments:
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size -- the order N of the tournament which is equal to the number of the created transactions
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n_tx_to_mine -- the number of transaction that should be mined into a block
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If all of the N created transactions tx[0]..tx[N-1] reside in the mempool,
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the following holds:
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the tx[K] transaction:
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- has N-K descendants (including this one), and
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- has K+1 ancestors (including this one)
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More details: https://en.wikipedia.org/wiki/Tournament_(graph_theory)
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"""
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wallet = MiniWallet(self.nodes[0])
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first_block_hash = ''
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tx_id = []
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tx_size = []
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self.log.info('Creating {} transactions...'.format(size))
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for i in range(0, size):
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self.log.debug('Preparing transaction #{}...'.format(i))
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# Prepare inputs.
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if i == 0:
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inputs = [wallet.get_utxo()] # let MiniWallet provide a start UTXO
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else:
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inputs = []
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for j, tx in enumerate(tx_id[0:i]):
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# Transaction tx[K] is a child of each of previous transactions tx[0]..tx[K-1] at their output K-1.
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vout = i - j - 1
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inputs.append(wallet.get_utxo(txid=tx_id[j], vout=vout))
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# Prepare outputs.
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tx_count = i + 1
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if tx_count < size:
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# Transaction tx[K] is an ancestor of each of subsequent transactions tx[K+1]..tx[N-1].
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n_outputs = size - tx_count
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else:
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n_outputs = 1
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# Create a new transaction.
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new_tx = wallet.send_self_transfer_multi(
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from_node=self.nodes[0],
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utxos_to_spend=inputs,
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num_outputs=n_outputs,
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fee_per_output=ceil(fee / n_outputs)
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)
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tx_id.append(new_tx['txid'])
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tx_size.append(new_tx['tx'].get_vsize())
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if tx_count in n_tx_to_mine:
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# The created transactions are mined into blocks by batches.
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self.log.info('The batch of {} transactions has been accepted into the mempool.'.format(len(self.nodes[0].getrawmempool())))
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block_hash = self.generate(self.nodes[0], 1)[0]
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if not first_block_hash:
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first_block_hash = block_hash
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assert_equal(len(self.nodes[0].getrawmempool()), 0)
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self.log.info('All of the transactions from the current batch have been mined into a block.')
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elif tx_count == size:
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# At the end all of the mined blocks are invalidated, and all of the created
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# transactions should be re-added from disconnected blocks to the mempool.
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self.log.info('The last batch of {} transactions has been accepted into the mempool.'.format(len(self.nodes[0].getrawmempool())))
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start = time.time()
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self.nodes[0].invalidateblock(first_block_hash)
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end = time.time()
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assert_equal(len(self.nodes[0].getrawmempool()), size)
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self.log.info('All of the recently mined transactions have been re-added into the mempool in {} seconds.'.format(end - start))
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self.log.info('Checking descendants/ancestors properties of all of the in-mempool transactions...')
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for k, tx in enumerate(tx_id):
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self.log.debug('Check transaction #{}.'.format(k))
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entry = self.nodes[0].getmempoolentry(tx)
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assert_equal(entry['descendantcount'], size - k)
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assert_equal(entry['descendantsize'], sum(tx_size[k:size]))
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assert_equal(entry['ancestorcount'], k + 1)
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assert_equal(entry['ancestorsize'], sum(tx_size[0:(k + 1)]))
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def run_test(self):
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# Use batch size limited by DEFAULT_ANCESTOR_LIMIT = 25 to not fire "too many unconfirmed parents" error.
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self.transaction_graph_test(size=100, n_tx_to_mine=[25, 50, 75])
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if __name__ == '__main__':
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MempoolUpdateFromBlockTest(__file__).main()
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