#!/usr/bin/env python3 # Copyright (c) 2021 The Bitcoin Core developers # Distributed under the MIT software license, see the accompanying # file COPYING or http://www.opensource.org/licenses/mit-license.php. """Test logic for limiting mempool and package ancestors/descendants.""" from decimal import Decimal from test_framework.address import ADDRESS_BCRT1_P2WSH_OP_TRUE from test_framework.test_framework import BitcoinTestFramework from test_framework.messages import ( COIN, CTransaction, CTxInWitness, tx_from_hex, WITNESS_SCALE_FACTOR, ) from test_framework.script import ( CScript, OP_TRUE, ) from test_framework.util import ( assert_equal, ) from test_framework.wallet import ( bulk_transaction, create_child_with_parents, make_chain, ) class MempoolPackageLimitsTest(BitcoinTestFramework): def set_test_params(self): self.num_nodes = 1 self.setup_clean_chain = True def run_test(self): self.log.info("Generate blocks to create UTXOs") node = self.nodes[0] self.privkeys = [node.get_deterministic_priv_key().key] self.address = node.get_deterministic_priv_key().address self.coins = [] # The last 100 coinbase transactions are premature for b in node.generatetoaddress(200, self.address)[:100]: coinbase = node.getblock(blockhash=b, verbosity=2)["tx"][0] self.coins.append({ "txid": coinbase["txid"], "amount": coinbase["vout"][0]["value"], "scriptPubKey": coinbase["vout"][0]["scriptPubKey"], }) self.test_chain_limits() self.test_desc_count_limits() self.test_anc_count_limits() self.test_anc_count_limits_2() self.test_anc_count_limits_bushy() # The node will accept our (nonstandard) extra large OP_RETURN outputs self.restart_node(0, extra_args=["-acceptnonstdtxn=1"]) self.test_anc_size_limits() self.test_desc_size_limits() def test_chain_limits_helper(self, mempool_count, package_count): node = self.nodes[0] assert_equal(0, node.getmempoolinfo()["size"]) first_coin = self.coins.pop() spk = None txid = first_coin["txid"] chain_hex = [] chain_txns = [] value = first_coin["amount"] for i in range(mempool_count + package_count): (tx, txhex, value, spk) = make_chain(node, self.address, self.privkeys, txid, value, 0, spk) txid = tx.rehash() if i < mempool_count: node.sendrawtransaction(txhex) assert_equal(node.getmempoolentry(txid)["ancestorcount"], i + 1) else: chain_hex.append(txhex) chain_txns.append(tx) testres_too_long = node.testmempoolaccept(rawtxs=chain_hex) for txres in testres_too_long: assert_equal(txres["package-error"], "package-mempool-limits") # Clear mempool and check that the package passes now node.generate(1) assert all([res["allowed"] for res in node.testmempoolaccept(rawtxs=chain_hex)]) def test_chain_limits(self): """Create chains from mempool and package transactions that are longer than 25, but only if both in-mempool and in-package transactions are considered together. This checks that both mempool and in-package transactions are taken into account when calculating ancestors/descendant limits. """ self.log.info("Check that in-package ancestors count for mempool ancestor limits") # 24 transactions in the mempool and 2 in the package. The parent in the package has # 24 in-mempool ancestors and 1 in-package descendant. The child has 0 direct parents # in the mempool, but 25 in-mempool and in-package ancestors in total. self.test_chain_limits_helper(24, 2) # 2 transactions in the mempool and 24 in the package. self.test_chain_limits_helper(2, 24) # 13 transactions in the mempool and 13 in the package. self.test_chain_limits_helper(13, 13) def test_desc_count_limits(self): """Create an 'A' shaped package with 24 transactions in the mempool and 2 in the package: M1 ^ ^ M2a M2b . . . . . . M12a ^ ^ M13b ^ ^ Pa Pb The top ancestor in the package exceeds descendant limits but only if the in-mempool and in-package descendants are all considered together (24 including in-mempool descendants and 26 including both package transactions). """ node = self.nodes[0] assert_equal(0, node.getmempoolinfo()["size"]) self.log.info("Check that in-mempool and in-package descendants are calculated properly in packages") # Top parent in mempool, M1 first_coin = self.coins.pop() parent_value = (first_coin["amount"] - Decimal("0.0002")) / 2 # Deduct reasonable fee and make 2 outputs inputs = [{"txid": first_coin["txid"], "vout": 0}] outputs = [{self.address : parent_value}, {ADDRESS_BCRT1_P2WSH_OP_TRUE : parent_value}] rawtx = node.createrawtransaction(inputs, outputs) parent_signed = node.signrawtransactionwithkey(hexstring=rawtx, privkeys=self.privkeys) assert parent_signed["complete"] parent_tx = tx_from_hex(parent_signed["hex"]) parent_txid = parent_tx.rehash() node.sendrawtransaction(parent_signed["hex"]) package_hex = [] # Chain A spk = parent_tx.vout[0].scriptPubKey.hex() value = parent_value txid = parent_txid for i in range(12): (tx, txhex, value, spk) = make_chain(node, self.address, self.privkeys, txid, value, 0, spk) txid = tx.rehash() if i < 11: # M2a... M12a node.sendrawtransaction(txhex) else: # Pa package_hex.append(txhex) # Chain B value = parent_value - Decimal("0.0001") rawtx_b = node.createrawtransaction([{"txid": parent_txid, "vout": 1}], {self.address : value}) tx_child_b = tx_from_hex(rawtx_b) # M2b tx_child_b.wit.vtxinwit = [CTxInWitness()] tx_child_b.wit.vtxinwit[0].scriptWitness.stack = [CScript([OP_TRUE])] tx_child_b_hex = tx_child_b.serialize().hex() node.sendrawtransaction(tx_child_b_hex) spk = tx_child_b.vout[0].scriptPubKey.hex() txid = tx_child_b.rehash() for i in range(12): (tx, txhex, value, spk) = make_chain(node, self.address, self.privkeys, txid, value, 0, spk) txid = tx.rehash() if i < 11: # M3b... M13b node.sendrawtransaction(txhex) else: # Pb package_hex.append(txhex) assert_equal(24, node.getmempoolinfo()["size"]) assert_equal(2, len(package_hex)) testres_too_long = node.testmempoolaccept(rawtxs=package_hex) for txres in testres_too_long: assert_equal(txres["package-error"], "package-mempool-limits") # Clear mempool and check that the package passes now node.generate(1) assert all([res["allowed"] for res in node.testmempoolaccept(rawtxs=package_hex)]) def test_anc_count_limits(self): """Create a 'V' shaped chain with 24 transactions in the mempool and 3 in the package: M1a M1b ^ ^ M2a M2b . . . . . . M12a M12b ^ ^ Pa Pb ^ ^ Pc The lowest descendant, Pc, exceeds ancestor limits, but only if the in-mempool and in-package ancestors are all considered together. """ node = self.nodes[0] assert_equal(0, node.getmempoolinfo()["size"]) package_hex = [] parents_tx = [] values = [] scripts = [] self.log.info("Check that in-mempool and in-package ancestors are calculated properly in packages") # Two chains of 13 transactions each for _ in range(2): spk = None top_coin = self.coins.pop() txid = top_coin["txid"] value = top_coin["amount"] for i in range(13): (tx, txhex, value, spk) = make_chain(node, self.address, self.privkeys, txid, value, 0, spk) txid = tx.rehash() if i < 12: node.sendrawtransaction(txhex) else: # Save the 13th transaction for the package package_hex.append(txhex) parents_tx.append(tx) scripts.append(spk) values.append(value) # Child Pc child_hex = create_child_with_parents(node, self.address, self.privkeys, parents_tx, values, scripts) package_hex.append(child_hex) assert_equal(24, node.getmempoolinfo()["size"]) assert_equal(3, len(package_hex)) testres_too_long = node.testmempoolaccept(rawtxs=package_hex) for txres in testres_too_long: assert_equal(txres["package-error"], "package-mempool-limits") # Clear mempool and check that the package passes now node.generate(1) assert all([res["allowed"] for res in node.testmempoolaccept(rawtxs=package_hex)]) def test_anc_count_limits_2(self): """Create a 'Y' shaped chain with 24 transactions in the mempool and 2 in the package: M1a M1b ^ ^ M2a M2b . . . . . . M12a M12b ^ ^ Pc ^ Pd The lowest descendant, Pd, exceeds ancestor limits, but only if the in-mempool and in-package ancestors are all considered together. """ node = self.nodes[0] assert_equal(0, node.getmempoolinfo()["size"]) parents_tx = [] values = [] scripts = [] self.log.info("Check that in-mempool and in-package ancestors are calculated properly in packages") # Two chains of 12 transactions each for _ in range(2): spk = None top_coin = self.coins.pop() txid = top_coin["txid"] value = top_coin["amount"] for i in range(12): (tx, txhex, value, spk) = make_chain(node, self.address, self.privkeys, txid, value, 0, spk) txid = tx.rehash() value -= Decimal("0.0001") node.sendrawtransaction(txhex) if i == 11: # last 2 transactions will be the parents of Pc parents_tx.append(tx) values.append(value) scripts.append(spk) # Child Pc pc_hex = create_child_with_parents(node, self.address, self.privkeys, parents_tx, values, scripts) pc_tx = tx_from_hex(pc_hex) pc_value = sum(values) - Decimal("0.0002") pc_spk = pc_tx.vout[0].scriptPubKey.hex() # Child Pd (_, pd_hex, _, _) = make_chain(node, self.address, self.privkeys, pc_tx.rehash(), pc_value, 0, pc_spk) assert_equal(24, node.getmempoolinfo()["size"]) testres_too_long = node.testmempoolaccept(rawtxs=[pc_hex, pd_hex]) for txres in testres_too_long: assert_equal(txres["package-error"], "package-mempool-limits") # Clear mempool and check that the package passes now node.generate(1) assert all([res["allowed"] for res in node.testmempoolaccept(rawtxs=[pc_hex, pd_hex])]) def test_anc_count_limits_bushy(self): """Create a tree with 20 transactions in the mempool and 6 in the package: M1...M4 M5...M8 M9...M12 M13...M16 M17...M20 ^ ^ ^ ^ ^ (each with 4 parents) P0 P1 P2 P3 P4 ^ ^ ^ ^ ^ (5 parents) PC Where M(4i+1)...M+(4i+4) are the parents of Pi and P0, P1, P2, P3, and P4 are the parents of PC. P0... P4 individually only have 4 parents each, and PC has no in-mempool parents. But combined, PC has 25 in-mempool and in-package parents. """ node = self.nodes[0] assert_equal(0, node.getmempoolinfo()["size"]) package_hex = [] parent_txns = [] parent_values = [] scripts = [] for _ in range(5): # Make package transactions P0 ... P4 gp_tx = [] gp_values = [] gp_scripts = [] for _ in range(4): # Make mempool transactions M(4i+1)...M(4i+4) parent_coin = self.coins.pop() value = parent_coin["amount"] txid = parent_coin["txid"] (tx, txhex, value, spk) = make_chain(node, self.address, self.privkeys, txid, value) gp_tx.append(tx) gp_values.append(value) gp_scripts.append(spk) node.sendrawtransaction(txhex) # Package transaction Pi pi_hex = create_child_with_parents(node, self.address, self.privkeys, gp_tx, gp_values, gp_scripts) package_hex.append(pi_hex) pi_tx = tx_from_hex(pi_hex) parent_txns.append(pi_tx) parent_values.append(Decimal(pi_tx.vout[0].nValue) / COIN) scripts.append(pi_tx.vout[0].scriptPubKey.hex()) # Package transaction PC package_hex.append(create_child_with_parents(node, self.address, self.privkeys, parent_txns, parent_values, scripts)) assert_equal(20, node.getmempoolinfo()["size"]) assert_equal(6, len(package_hex)) testres = node.testmempoolaccept(rawtxs=package_hex) for txres in testres: assert_equal(txres["package-error"], "package-mempool-limits") # Clear mempool and check that the package passes now node.generate(1) assert all([res["allowed"] for res in node.testmempoolaccept(rawtxs=package_hex)]) def test_anc_size_limits(self): """Test Case with 2 independent transactions in the mempool and a parent + child in the package, where the package parent is the child of both mempool transactions (30KvB each): A B ^ ^ C ^ D The lowest descendant, D, exceeds ancestor size limits, but only if the in-mempool and in-package ancestors are all considered together. """ node = self.nodes[0] assert_equal(0, node.getmempoolinfo()["size"]) parents_tx = [] values = [] scripts = [] target_weight = WITNESS_SCALE_FACTOR * 1000 * 30 # 30KvB high_fee = Decimal("0.003") # 10 sats/vB self.log.info("Check that in-mempool and in-package ancestor size limits are calculated properly in packages") # Mempool transactions A and B for _ in range(2): spk = None top_coin = self.coins.pop() txid = top_coin["txid"] value = top_coin["amount"] (tx, _, _, _) = make_chain(node, self.address, self.privkeys, txid, value, 0, spk, high_fee) bulked_tx = bulk_transaction(tx, node, target_weight, self.privkeys) node.sendrawtransaction(bulked_tx.serialize().hex()) parents_tx.append(bulked_tx) values.append(Decimal(bulked_tx.vout[0].nValue) / COIN) scripts.append(bulked_tx.vout[0].scriptPubKey.hex()) # Package transaction C small_pc_hex = create_child_with_parents(node, self.address, self.privkeys, parents_tx, values, scripts, high_fee) pc_tx = bulk_transaction(tx_from_hex(small_pc_hex), node, target_weight, self.privkeys) pc_value = Decimal(pc_tx.vout[0].nValue) / COIN pc_spk = pc_tx.vout[0].scriptPubKey.hex() pc_hex = pc_tx.serialize().hex() # Package transaction D (small_pd, _, val, spk) = make_chain(node, self.address, self.privkeys, pc_tx.rehash(), pc_value, 0, pc_spk, high_fee) prevtxs = [{ "txid": pc_tx.rehash(), "vout": 0, "scriptPubKey": spk, "amount": val, }] pd_tx = bulk_transaction(small_pd, node, target_weight, self.privkeys, prevtxs) pd_hex = pd_tx.serialize().hex() assert_equal(2, node.getmempoolinfo()["size"]) testres_too_heavy = node.testmempoolaccept(rawtxs=[pc_hex, pd_hex]) for txres in testres_too_heavy: assert_equal(txres["package-error"], "package-mempool-limits") # Clear mempool and check that the package passes now node.generate(1) assert all([res["allowed"] for res in node.testmempoolaccept(rawtxs=[pc_hex, pd_hex])]) def test_desc_size_limits(self): """Create 3 mempool transactions and 2 package transactions (25KvB each): Ma ^ ^ Mb Mc ^ ^ Pd Pe The top ancestor in the package exceeds descendant size limits but only if the in-mempool and in-package descendants are all considered together. """ node = self.nodes[0] assert_equal(0, node.getmempoolinfo()["size"]) target_weight = 21 * 1000 * WITNESS_SCALE_FACTOR high_fee = Decimal("0.0021") # 10 sats/vB self.log.info("Check that in-mempool and in-package descendant sizes are calculated properly in packages") # Top parent in mempool, Ma first_coin = self.coins.pop() parent_value = (first_coin["amount"] - high_fee) / 2 # Deduct fee and make 2 outputs inputs = [{"txid": first_coin["txid"], "vout": 0}] outputs = [{self.address : parent_value}, {ADDRESS_BCRT1_P2WSH_OP_TRUE: parent_value}] rawtx = node.createrawtransaction(inputs, outputs) parent_tx = bulk_transaction(tx_from_hex(rawtx), node, target_weight, self.privkeys) node.sendrawtransaction(parent_tx.serialize().hex()) package_hex = [] for j in range(2): # Two legs (left and right) # Mempool transaction (Mb and Mc) mempool_tx = CTransaction() spk = parent_tx.vout[j].scriptPubKey.hex() value = Decimal(parent_tx.vout[j].nValue) / COIN txid = parent_tx.rehash() prevtxs = [{ "txid": txid, "vout": j, "scriptPubKey": spk, "amount": value, }] if j == 0: # normal key (tx_small, _, _, _) = make_chain(node, self.address, self.privkeys, txid, value, j, spk, high_fee) mempool_tx = bulk_transaction(tx_small, node, target_weight, self.privkeys, prevtxs) else: # OP_TRUE inputs = [{"txid": txid, "vout": 1}] outputs = {self.address: value - high_fee} small_tx = tx_from_hex(node.createrawtransaction(inputs, outputs)) mempool_tx = bulk_transaction(small_tx, node, target_weight, None, prevtxs) node.sendrawtransaction(mempool_tx.serialize().hex()) # Package transaction (Pd and Pe) spk = mempool_tx.vout[0].scriptPubKey.hex() value = Decimal(mempool_tx.vout[0].nValue) / COIN txid = mempool_tx.rehash() (tx_small, _, _, _) = make_chain(node, self.address, self.privkeys, txid, value, 0, spk, high_fee) prevtxs = [{ "txid": txid, "vout": 0, "scriptPubKey": spk, "amount": value, }] package_tx = bulk_transaction(tx_small, node, target_weight, self.privkeys, prevtxs) package_hex.append(package_tx.serialize().hex()) assert_equal(3, node.getmempoolinfo()["size"]) assert_equal(2, len(package_hex)) testres_too_heavy = node.testmempoolaccept(rawtxs=package_hex) for txres in testres_too_heavy: assert_equal(txres["package-error"], "package-mempool-limits") # Clear mempool and check that the package passes now node.generate(1) assert all([res["allowed"] for res in node.testmempoolaccept(rawtxs=package_hex)]) if __name__ == "__main__": MempoolPackageLimitsTest().main()