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342 lines
14 KiB
342 lines
14 KiB
#!/usr/bin/env python3
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# Copyright (c) 2021-2022 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 logic for limiting mempool and package ancestors/descendants."""
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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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)
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from test_framework.wallet import MiniWallet
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# Decorator to
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# 1) check that mempool is empty at the start of a subtest
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# 2) run the subtest, which may submit some transaction(s) to the mempool and
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# create a list of hex transactions
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# 3) testmempoolaccept the package hex and check that it fails with the error
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# "package-mempool-limits" for each tx
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# 4) after mining a block, clearing the pre-submitted transactions from mempool,
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# check that submitting the created package succeeds
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def check_package_limits(func):
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def func_wrapper(self, *args, **kwargs):
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node = self.nodes[0]
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assert_equal(0, node.getmempoolinfo()["size"])
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package_hex = func(self, *args, **kwargs)
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testres_error_expected = node.testmempoolaccept(rawtxs=package_hex)
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assert_equal(len(testres_error_expected), len(package_hex))
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for txres in testres_error_expected:
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assert "package-mempool-limits" in txres["package-error"]
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# Clear mempool and check that the package passes now
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self.generate(node, 1)
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assert all([res["allowed"] for res in node.testmempoolaccept(rawtxs=package_hex)])
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return func_wrapper
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class MempoolPackageLimitsTest(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 run_test(self):
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self.wallet = MiniWallet(self.nodes[0])
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# Add enough mature utxos to the wallet so that all txs spend confirmed coins.
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self.generate(self.wallet, COINBASE_MATURITY + 35)
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self.test_chain_limits()
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self.test_desc_count_limits()
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self.test_desc_count_limits_2()
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self.test_anc_count_limits()
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self.test_anc_count_limits_2()
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self.test_anc_count_limits_bushy()
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# The node will accept (nonstandard) extra large OP_RETURN outputs
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self.restart_node(0, extra_args=["-datacarriersize=100000"])
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self.test_anc_size_limits()
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self.test_desc_size_limits()
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@check_package_limits
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def test_chain_limits_helper(self, mempool_count, package_count):
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node = self.nodes[0]
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chain_hex = []
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chaintip_utxo = self.wallet.send_self_transfer_chain(from_node=node, chain_length=mempool_count)[-1]["new_utxo"]
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# in-package transactions
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for _ in range(package_count):
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tx = self.wallet.create_self_transfer(utxo_to_spend=chaintip_utxo)
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chaintip_utxo = tx["new_utxo"]
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chain_hex.append(tx["hex"])
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return chain_hex
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def test_chain_limits(self):
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"""Create chains from mempool and package transactions that are longer than 25,
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but only if both in-mempool and in-package transactions are considered together.
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This checks that both mempool and in-package transactions are taken into account when
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calculating ancestors/descendant limits.
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"""
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self.log.info("Check that in-package ancestors count for mempool ancestor limits")
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# 24 transactions in the mempool and 2 in the package. The parent in the package has
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# 24 in-mempool ancestors and 1 in-package descendant. The child has 0 direct parents
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# in the mempool, but 25 in-mempool and in-package ancestors in total.
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self.test_chain_limits_helper(24, 2)
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# 2 transactions in the mempool and 24 in the package.
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self.test_chain_limits_helper(2, 24)
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# 13 transactions in the mempool and 13 in the package.
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self.test_chain_limits_helper(13, 13)
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@check_package_limits
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def test_desc_count_limits(self):
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"""Create an 'A' shaped package with 24 transactions in the mempool and 2 in the package:
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M1
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^ ^
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M2a M2b
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. .
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. .
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. .
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M12a ^
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^ M13b
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^ ^
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Pa Pb
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The top ancestor in the package exceeds descendant limits but only if the in-mempool and in-package
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descendants are all considered together (24 including in-mempool descendants and 26 including both
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package transactions).
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"""
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node = self.nodes[0]
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self.log.info("Check that in-mempool and in-package descendants are calculated properly in packages")
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# Top parent in mempool, M1
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m1_utxos = self.wallet.send_self_transfer_multi(from_node=node, num_outputs=2)['new_utxos']
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package_hex = []
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# Chain A (M2a... M12a)
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chain_a_tip_utxo = self.wallet.send_self_transfer_chain(from_node=node, chain_length=11, utxo_to_spend=m1_utxos[0])[-1]["new_utxo"]
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# Pa
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pa_hex = self.wallet.create_self_transfer(utxo_to_spend=chain_a_tip_utxo)["hex"]
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package_hex.append(pa_hex)
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# Chain B (M2b... M13b)
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chain_b_tip_utxo = self.wallet.send_self_transfer_chain(from_node=node, chain_length=12, utxo_to_spend=m1_utxos[1])[-1]["new_utxo"]
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# Pb
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pb_hex = self.wallet.create_self_transfer(utxo_to_spend=chain_b_tip_utxo)["hex"]
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package_hex.append(pb_hex)
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assert_equal(24, node.getmempoolinfo()["size"])
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assert_equal(2, len(package_hex))
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return package_hex
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@check_package_limits
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def test_desc_count_limits_2(self):
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"""Create a Package with 24 transaction in mempool and 2 transaction in package:
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M1
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^ ^
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M2 ^
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. ^
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. ^
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. ^
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M24 ^
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^
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P1
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^
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P2
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P1 has M1 as a mempool ancestor, P2 has no in-mempool ancestors, but when
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combined P2 has M1 as an ancestor and M1 exceeds descendant_limits(23 in-mempool
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descendants + 2 in-package descendants, a total of 26 including itself).
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"""
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node = self.nodes[0]
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package_hex = []
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# M1
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m1_utxos = self.wallet.send_self_transfer_multi(from_node=node, num_outputs=2)['new_utxos']
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# Chain M2...M24
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self.wallet.send_self_transfer_chain(from_node=node, chain_length=23, utxo_to_spend=m1_utxos[0])[-1]["new_utxo"]
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# P1
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p1_tx = self.wallet.create_self_transfer(utxo_to_spend=m1_utxos[1])
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package_hex.append(p1_tx["hex"])
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# P2
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p2_tx = self.wallet.create_self_transfer(utxo_to_spend=p1_tx["new_utxo"])
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package_hex.append(p2_tx["hex"])
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assert_equal(24, node.getmempoolinfo()["size"])
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assert_equal(2, len(package_hex))
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return package_hex
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@check_package_limits
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def test_anc_count_limits(self):
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"""Create a 'V' shaped chain with 24 transactions in the mempool and 3 in the package:
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M1a M1b
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^ ^
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M2a M2b
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. .
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. .
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. .
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M12a M12b
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^ ^
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Pa Pb
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^ ^
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Pc
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The lowest descendant, Pc, exceeds ancestor limits, but only if the in-mempool
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and in-package ancestors are all considered together.
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"""
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node = self.nodes[0]
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package_hex = []
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pc_parent_utxos = []
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self.log.info("Check that in-mempool and in-package ancestors are calculated properly in packages")
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# Two chains of 13 transactions each
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for _ in range(2):
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chain_tip_utxo = self.wallet.send_self_transfer_chain(from_node=node, chain_length=12)[-1]["new_utxo"]
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# Save the 13th transaction for the package
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tx = self.wallet.create_self_transfer(utxo_to_spend=chain_tip_utxo)
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package_hex.append(tx["hex"])
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pc_parent_utxos.append(tx["new_utxo"])
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# Child Pc
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pc_hex = self.wallet.create_self_transfer_multi(utxos_to_spend=pc_parent_utxos)["hex"]
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package_hex.append(pc_hex)
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assert_equal(24, node.getmempoolinfo()["size"])
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assert_equal(3, len(package_hex))
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return package_hex
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@check_package_limits
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def test_anc_count_limits_2(self):
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"""Create a 'Y' shaped chain with 24 transactions in the mempool and 2 in the package:
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M1a M1b
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^ ^
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M2a M2b
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. .
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. .
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. .
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M12a M12b
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^ ^
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Pc
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^
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Pd
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The lowest descendant, Pd, exceeds ancestor limits, but only if the in-mempool
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and in-package ancestors are all considered together.
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"""
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node = self.nodes[0]
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pc_parent_utxos = []
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self.log.info("Check that in-mempool and in-package ancestors are calculated properly in packages")
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# Two chains of 12 transactions each
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for _ in range(2):
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chaintip_utxo = self.wallet.send_self_transfer_chain(from_node=node, chain_length=12)[-1]["new_utxo"]
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# last 2 transactions will be the parents of Pc
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pc_parent_utxos.append(chaintip_utxo)
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# Child Pc
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pc_tx = self.wallet.create_self_transfer_multi(utxos_to_spend=pc_parent_utxos)
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# Child Pd
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pd_tx = self.wallet.create_self_transfer(utxo_to_spend=pc_tx["new_utxos"][0])
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assert_equal(24, node.getmempoolinfo()["size"])
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return [pc_tx["hex"], pd_tx["hex"]]
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@check_package_limits
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def test_anc_count_limits_bushy(self):
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"""Create a tree with 20 transactions in the mempool and 6 in the package:
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M1...M4 M5...M8 M9...M12 M13...M16 M17...M20
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^ ^ ^ ^ ^ (each with 4 parents)
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P0 P1 P2 P3 P4
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^ ^ ^ ^ ^ (5 parents)
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PC
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Where M(4i+1)...M+(4i+4) are the parents of Pi and P0, P1, P2, P3, and P4 are the parents of PC.
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P0... P4 individually only have 4 parents each, and PC has no in-mempool parents. But
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combined, PC has 25 in-mempool and in-package parents.
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"""
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node = self.nodes[0]
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package_hex = []
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pc_parent_utxos = []
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for _ in range(5): # Make package transactions P0 ... P4
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pc_grandparent_utxos = []
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for _ in range(4): # Make mempool transactions M(4i+1)...M(4i+4)
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pc_grandparent_utxos.append(self.wallet.send_self_transfer(from_node=node)["new_utxo"])
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# Package transaction Pi
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pi_tx = self.wallet.create_self_transfer_multi(utxos_to_spend=pc_grandparent_utxos)
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package_hex.append(pi_tx["hex"])
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pc_parent_utxos.append(pi_tx["new_utxos"][0])
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# Package transaction PC
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pc_hex = self.wallet.create_self_transfer_multi(utxos_to_spend=pc_parent_utxos)["hex"]
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package_hex.append(pc_hex)
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assert_equal(20, node.getmempoolinfo()["size"])
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assert_equal(6, len(package_hex))
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return package_hex
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@check_package_limits
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def test_anc_size_limits(self):
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"""Test Case with 2 independent transactions in the mempool and a parent + child in the
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package, where the package parent is the child of both mempool transactions (30KvB each):
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A B
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^ ^
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C
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^
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D
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The lowest descendant, D, exceeds ancestor size limits, but only if the in-mempool
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and in-package ancestors are all considered together.
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"""
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node = self.nodes[0]
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parent_utxos = []
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target_vsize = 30_000
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high_fee = 10 * target_vsize # 10 sats/vB
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self.log.info("Check that in-mempool and in-package ancestor size limits are calculated properly in packages")
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# Mempool transactions A and B
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for _ in range(2):
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bulked_tx = self.wallet.create_self_transfer(target_vsize=target_vsize)
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self.wallet.sendrawtransaction(from_node=node, tx_hex=bulked_tx["hex"])
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parent_utxos.append(bulked_tx["new_utxo"])
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# Package transaction C
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pc_tx = self.wallet.create_self_transfer_multi(utxos_to_spend=parent_utxos, fee_per_output=high_fee, target_vsize=target_vsize)
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# Package transaction D
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pd_tx = self.wallet.create_self_transfer(utxo_to_spend=pc_tx["new_utxos"][0], target_vsize=target_vsize)
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assert_equal(2, node.getmempoolinfo()["size"])
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return [pc_tx["hex"], pd_tx["hex"]]
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@check_package_limits
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def test_desc_size_limits(self):
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"""Create 3 mempool transactions and 2 package transactions (21KvB each):
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Ma
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^ ^
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Mb Mc
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^ ^
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Pd Pe
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The top ancestor in the package exceeds descendant size limits but only if the in-mempool
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and in-package descendants are all considered together.
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"""
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node = self.nodes[0]
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target_vsize = 21_000
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high_fee = 10 * target_vsize # 10 sats/vB
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self.log.info("Check that in-mempool and in-package descendant sizes are calculated properly in packages")
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# Top parent in mempool, Ma
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ma_tx = self.wallet.create_self_transfer_multi(num_outputs=2, fee_per_output=high_fee // 2, target_vsize=target_vsize)
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self.wallet.sendrawtransaction(from_node=node, tx_hex=ma_tx["hex"])
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package_hex = []
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for j in range(2): # Two legs (left and right)
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# Mempool transaction (Mb and Mc)
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mempool_tx = self.wallet.create_self_transfer(utxo_to_spend=ma_tx["new_utxos"][j], target_vsize=target_vsize)
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self.wallet.sendrawtransaction(from_node=node, tx_hex=mempool_tx["hex"])
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# Package transaction (Pd and Pe)
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package_tx = self.wallet.create_self_transfer(utxo_to_spend=mempool_tx["new_utxo"], target_vsize=target_vsize)
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package_hex.append(package_tx["hex"])
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assert_equal(3, node.getmempoolinfo()["size"])
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assert_equal(2, len(package_hex))
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return package_hex
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if __name__ == "__main__":
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MempoolPackageLimitsTest(__file__).main()
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