READ THE CODE

Inside Bitcoin

The code behind the network, with room to understand it.

Stable release v32.1bitcoin/bitcoin · f0de87f04062 ↗3,020 source files · 47.5 MB stored on the server440 file guides

Release published 2026-10-28 · Snapshot fetched 2026-11-01. Latest stable release at fetch time; development branches and Git history are excluded. Only the selected code window and visible folders load here.

6,450 bytes · SHA-256 7830d94bc722101e… · View upstream ↗

1#!/usr/bin/env python3
2# Copyright (c) 2024-present The Bitcoin Core developers
3# Distributed under the MIT software license, see the accompanying
4# file COPYING or http://www.opensource.org/licenses/mit-license.php.
5"""
6Test that 1p1c package submission allows a 1p1c package to propagate in a "network" of nodes. Send
7various packages from different nodes on a network in which some nodes have already received some of
8the transactions (and submitted them to mempool, kept them as orphans or rejected them as
9too-low-feerate transactions). The packages should be received and accepted by all nodes.
10"""
11
12from decimal import Decimal
13
14from test_framework.mempool_util import (
15    DEFAULT_MIN_RELAY_TX_FEE,
16)
17from test_framework.messages import (
18    COIN,
19    msg_tx,
20)
21from test_framework.p2p import (
22    P2PInterface,
23)
24from test_framework.test_framework import BitcoinTestFramework
25from test_framework.util import (
26    assert_equal,
27)
28from test_framework.wallet import (
29    MiniWallet,
30    MiniWalletMode,
31)
32
33class PackageRelayTest(BitcoinTestFramework):
34    def set_test_params(self):
35        self.setup_clean_chain = True
36        self.num_nodes = 4
37        # hugely speeds up the test, as it involves multiple hops of tx relay.
38        self.noban_tx_relay = True
39
40    def create_basic_1p1c(self, wallet):
41        low_fee_parent = wallet.create_self_transfer(fee_rate=0, confirmed_only=True)
42        high_fee_child = wallet.create_self_transfer(utxo_to_spend=low_fee_parent["new_utxo"], fee_rate=999*Decimal(DEFAULT_MIN_RELAY_TX_FEE)/ COIN)
43        package_hex_basic = [low_fee_parent["hex"], high_fee_child["hex"]]
44        return package_hex_basic, low_fee_parent["tx"], high_fee_child["tx"]
45
46    def create_package_2outs(self, wallet):
47        # First create a tester tx to see the vsize, and then adjust the fees
48        utxo_for_2outs = wallet.get_utxo(confirmed_only=True)
49
50        low_fee_parent_2outs = wallet.create_self_transfer_multi(
51            utxos_to_spend=[utxo_for_2outs],
52            num_outputs=2,
53            fee_per_output=0,
54        )
55
56        # Now create the child
57        high_fee_child_2outs = wallet.create_self_transfer_multi(
58            utxos_to_spend=low_fee_parent_2outs["new_utxos"][::-1],
59            fee_per_output=10_000,
60        )
61        return [low_fee_parent_2outs["hex"], high_fee_child_2outs["hex"]], low_fee_parent_2outs["tx"], high_fee_child_2outs["tx"]
62
63    def create_package_2p1c(self, wallet):
64        parent1 = wallet.create_self_transfer(fee_rate=Decimal(DEFAULT_MIN_RELAY_TX_FEE) / COIN * 10, confirmed_only=True)
65        parent2 = wallet.create_self_transfer(fee_rate=Decimal(DEFAULT_MIN_RELAY_TX_FEE) / COIN * 20, confirmed_only=True)
66        child = wallet.create_self_transfer_multi(
67            utxos_to_spend=[parent1["new_utxo"], parent2["new_utxo"]],
68            fee_per_output=999*parent1["tx"].get_vsize(),
69        )
70        return [parent1["hex"], parent2["hex"], child["hex"]], parent1["tx"], parent2["tx"], child["tx"]
71
72    def create_packages(self):
73        # 1: Basic 1-parent-1-child package, parent 0sat/vB, child 999sat/vB
74        package_hex_1, parent_1, child_1 = self.create_basic_1p1c(self.wallet)
75
76        # 2: same as 1, parent's txid is the same as its wtxid.
77        package_hex_2, parent_2, child_2 = self.create_basic_1p1c(self.wallet_nonsegwit)
78
79        # 3: 2-parent-1-child package. Both parents are above mempool min feerate. No package submission happens.
80        # We require packages to be child-with-parents and only allow 1-parent-1-child packages.
81        package_hex_3, parent_31, _parent_32, child_3 = self.create_package_2p1c(self.wallet)
82
83        # 4: parent + child package where the child spends 2 different outputs from the parent.
84        package_hex_4, parent_4, child_4 = self.create_package_2outs(self.wallet)
85
86        # Assemble return results
87        packages_to_submit = [package_hex_1, package_hex_2, package_hex_3, package_hex_4]
88        # node0: sender
89        # node1: pre-received the children (orphans, will be dropped on peer disconnect)
90        # node3: pre-received the parents (too low fee)
91        # All nodes receive parent_31 ahead of time.
92        txns_to_send = [
93            [],
94            [child_1, child_2, parent_31, child_3, child_4],
95            [parent_31],
96            [parent_1, parent_2, parent_31, parent_4]
97        ]
98
99        return packages_to_submit, txns_to_send
100
101    def run_test(self):
102        self.wallet = MiniWallet(self.nodes[1])
103        self.wallet_nonsegwit = MiniWallet(self.nodes[2], mode=MiniWalletMode.RAW_P2PK)
104        self.generate(self.wallet_nonsegwit, 10)
105        self.generate(self.wallet, 120)
106
107        # Create the transactions.
108        self.wallet.rescan_utxos(include_mempool=True)
109        packages_to_submit, transactions_to_presend = self.create_packages()
110
111        self.peers = [self.nodes[i].add_p2p_connection(P2PInterface()) for i in range(self.num_nodes)]
112
113        self.log.info("Pre-send some transactions to nodes")
114        for (i, peer) in enumerate(self.peers):
115            for tx in transactions_to_presend[i]:
116                peer.send_and_ping(msg_tx(tx))
117
118        # The fee-having parent should be the only thing in mempools
119        self.sync_mempools()
120        sufficient_parent = transactions_to_presend[2][0].txid_hex
121        for i, node in enumerate(self.nodes):
122            # node1 has non-empty orphanage as well
123            if i == 1:
124                assert_equal(len(self.nodes[i].getorphantxs()), 4)
125            else:
126                assert_equal(self.nodes[i].getorphantxs(), [])
127
128            assert_equal(node.getrawmempool(), [sufficient_parent])
129
130        # Disconnect python peers to clear outstanding orphan requests with them, avoiding timeouts.
131        # We are only interested in the syncing behavior between real nodes.
132        for i in range(self.num_nodes):
133            self.nodes[i].disconnect_p2ps()
134            self.wait_until(lambda: len(self.nodes[i].getorphantxs()) == 0)
135
136        self.log.info("Submit full packages to node0")
137        for package_hex in packages_to_submit:
138            submitpackage_result = self.nodes[0].submitpackage(package_hex)
139            assert_equal(submitpackage_result["package_msg"], "success")
140
141        self.log.info("Wait for mempools to sync")
142        self.wait_until(lambda: len(self.nodes[0].getrawmempool()) == 9)
143        self.sync_mempools()
144
145
146if __name__ == '__main__':
147    PackageRelayTest(__file__).main()
148

src/wallet/receive.cpp

src/wallet/coinselection.cpp

src/consensus/validation.h

src/primitives/transaction.cpp

src/script/descriptor.cpp

src/bitcoin-cli.cpp

src/rpc/blockchain.cpp

src/rpc/rawtransaction.cpp

src/init.cpp

src/crypto/sha256.cpp

src/consensus/merkle.h

src/consensus/tx_check.h

src/consensus/tx_verify.h

src/policy/feerate.h

src/policy/feerate.cpp

src/primitives/transaction_identifier.h

src/chainparamsbase.h

src/chainparamsbase.cpp

src/util/moneystr.cpp

src/crypto/ripemd160.h

src/crypto/sha1.h

src/crypto/sha512.h

src/crypto/hmac_sha256.h

src/crypto/hmac_sha512.h

src/crypto/hmac_sha256.cpp

src/crypto/hmac_sha512.cpp

src/crypto/hkdf_sha256_32.h

src/crypto/hkdf_sha256_32.cpp

src/support/cleanse.h

src/support/cleanse.cpp

src/crypto/siphash.cpp

src/crypto/muhash.h

src/crypto/chacha20.h

src/crypto/poly1305.h

src/crypto/chacha20poly1305.h

src/crypto/chacha20poly1305.cpp

src/util/chaintype.cpp

src/util/obfuscation.h

src/util/byte_units.h

src/util/overflow.h

src/blockencodings.cpp

src/net_permissions.cpp

src/policy/packages.cpp

src/policy/rbf.cpp

src/policy/truc_policy.cpp

src/policy/ephemeral_policy.cpp

src/policy/settings.cpp

src/policy/policy.cpp

src/node/transaction.cpp

src/node/coin.cpp

src/rpc/client.cpp

src/rpc/external_signer.cpp

src/rpc/request.cpp

src/rpc/server_util.cpp

src/rpc/fees.cpp

src/rpc/output_script.cpp

src/rpc/rawtransaction_util.cpp

src/rpc/rawtransaction_util.h

src/rpc/register.h

src/rpc/request.h

src/rpc/server_util.h

src/rpc/protocol.h

src/rpc/server.h

src/rpc/signmessage.cpp

src/rpc/txoutproof.cpp

src/rpc/util.cpp

src/rpc/util.h

src/wallet/rpc/addresses.cpp

src/wallet/rpc/backup.cpp

src/wallet/rpc/coins.cpp

src/wallet/rpc/encrypt.cpp

src/wallet/rpc/signmessage.cpp

src/wallet/rpc/util.cpp

src/wallet/rpc/util.h

src/wallet/coincontrol.cpp

src/wallet/coincontrol.h

src/wallet/context.cpp

src/wallet/context.h

src/wallet/crypter.cpp

src/wallet/crypter.h

src/wallet/db.cpp

src/wallet/export.cpp

src/wallet/external_signer_scriptpubkeyman.cpp

src/wallet/rpc/spend.cpp

src/wallet/rpc/transactions.cpp

src/wallet/rpc/wallet.cpp

src/wallet/feebumper.cpp

src/wallet/feebumper.h

src/index/base.h

src/index/base.cpp

src/index/txindex.h

src/index/txindex.cpp

src/index/txindex_key.h

src/index/txospenderindex.h

src/index/txospenderindex.cpp

src/index/blockfilterindex.h

src/index/blockfilterindex.cpp

src/index/coinstatsindex.h

src/index/coinstatsindex.cpp

src/index/db_key.h

src/index/disktxpos.h

src/kernel/chain.cpp

src/kernel/chain.h

src/kernel/checks.cpp

src/kernel/checks.h

src/kernel/context.cpp

src/kernel/context.h

src/kernel/cs_main.cpp

src/kernel/cs_main.h

src/kernel/disconnected_transactions.cpp

src/kernel/disconnected_transactions.h

src/kernel/mempool_removal_reason.cpp

src/kernel/mempool_removal_reason.h

src/kernel/coinstats.cpp

src/kernel/coinstats.h

src/kernel/chainparams.cpp

src/kernel/chainparams.h

src/wallet/sqlite.cpp

src/wallet/sqlite.h

src/wallet/transaction.cpp

src/wallet/transaction.h

src/wallet/dump.cpp

src/wallet/dump.h

src/wallet/init.cpp

src/wallet/walletutil.cpp

src/wallet/walletutil.h

src/wallet/wallettool.cpp

src/wallet/wallettool.h

src/wallet/export.h

src/wallet/migrate.cpp

src/wallet/migrate.h

src/wallet/db.h

src/wallet/walletdb.cpp

src/wallet/interfaces.cpp

src/wallet/scriptpubkeyman.cpp

src/wallet/scriptpubkeyman.h

src/kernel/bitcoinkernel.cpp

src/kernel/bitcoinkernel.h

src/kernel/bitcoinkernel_wrapper.h

src/node/chainstate.cpp

src/node/chainstate.h

src/node/blockstorage.cpp

src/node/blockstorage.h

src/node/mempool_persist.cpp

src/node/mempool_persist.h

src/node/utxo_snapshot.cpp

src/node/utxo_snapshot.h

src/node/kernel_notifications.cpp

src/node/kernel_notifications.h

src/node/blockmanager_args.cpp

src/kernel/blockmanager_opts.h

src/util/expected.cpp

src/policy/settings.h

src/util/types.h

src/kernel/messagestartchars.h

src/kernel/warning.h

src/util/exception.h

src/common/license_info.h

src/node/coins_view_args.h

src/node/database_args.h

src/util/batchpriority.h

src/util/ui_change_type.h

src/node/coins_view_args.cpp

src/node/peerman_args.h

src/util/serfloat.h

src/node/blockmanager_args.h

src/node/database_args.cpp

src/util/overloaded.h

src/interfaces/types.h

src/node/chainstatemanager_args.h

src/node/minisketchwrapper.h

src/util/macros.h

src/util/syserror.h

src/common/run_command.h

src/util/bytevectorhash.cpp

src/node/mempool_persist_args.cpp

src/util/exec.h

src/util/rbf.h

src/crypto/hex_base.h

src/node/mempool_persist_args.h

src/interfaces/echo.h

src/util/any.h

src/util/batchpriority.cpp

src/util/threadnames.h

src/node/coin.h

src/node/mempool_args.h

src/util/asmap.h

src/util/bytevectorhash.h

src/node/context.cpp

src/util/insert.h

src/util/readwritefile.h

src/node/peerman_args.cpp

src/node/interface_ui.cpp

src/interfaces/handler.h

src/node/mining_args.h

src/util/hasher.cpp

src/common/init.h

src/kernel/mempool_limits.h

src/common/system.h

src/crypto/sha3.h

src/util/threadinterrupt.cpp

src/node/protocol_version.h

src/util/exception.cpp

src/common/messages.h

src/node/connection_types.cpp

src/util/bip32.h

src/common/license_info.cpp

src/util/stdmutex.h

src/common/run_command.cpp

src/util/check.cpp

src/util/golombrice.h

src/node/types.h

src/node/timeoffsets.h

src/util/readwritefile.cpp

src/util/fastrange.h

src/util/signalinterrupt.h

src/util/task_runner.h

src/util/syserror.cpp

src/common/interfaces.cpp

src/common/types.h

src/util/threadinterrupt.h

src/kernel/chainstatemanager_opts.h

src/node/psbt.h

src/policy/ephemeral_policy.h

src/util/trace.h

src/common/url.cpp

src/kernel/mempool_options.h

src/util/serfloat.cpp

src/kernel/notifications_interface.h

src/node/timeoffsets.cpp

src/node/warnings.cpp

src/util/hash_type.h

src/crypto/hex_base.cpp

src/node/eviction.h

src/util/tokenbucket.h

src/crypto/aes.h

src/common/pcp.h

src/util/feefrac.cpp

src/node/transaction.h

src/util/threadnames.cpp

src/common/signmessage.h

src/util/exec.cpp

src/util/signalinterrupt.cpp

src/clientversion.cpp

src/common/signmessage.cpp

src/compat/assumptions.h

src/compat/byteswap.h

src/deploymentinfo.cpp

src/deploymentinfo.h

src/deploymentstatus.cpp

src/deploymentstatus.h

src/dummywallet.cpp

src/external_signer.h

src/init/bitcoin-gui.cpp

src/init/bitcoin-node.cpp

src/init/bitcoin-qt.cpp

src/init/bitcoin-wallet.cpp

src/init/bitcoind.cpp

src/init/common.h

src/interfaces/init.h

src/interfaces/ipc.h

src/key_io.h

src/logging/categories.h

src/logging/timer.h

src/mapport.h

src/musig.h

src/net_permissions.h

src/netgroup.h

src/netmessagemaker.h

src/node/chainstatemanager_args.cpp

src/node/connection_types.h

src/node/context.h

src/node/interface_ui.h

src/node/mempool_args.cpp

src/node/mining_args.cpp

src/node/minisketchwrapper.cpp

src/node/txreconciliation.h

src/policy/fees/estimator_args.cpp

src/policy/fees/estimator_args.h

src/policy/fees/estimator_man.cpp

src/policy/fees/estimator_man.h

src/policy/packages.h

src/policy/rbf.h

src/policy/truc_policy.h

src/pow.h

src/primitives/block.cpp

src/randomenv.h

src/rest.h

src/script/keyorigin.h

src/script/parsing.cpp

src/script/parsing.h

src/script/script_error.h

src/script/sigcache.cpp

src/script/sigcache.h

src/script/solver.h

src/script/verify_flags.h

src/semaphore_grant.h

src/signet.h

src/span.h

src/support/allocators/secure.h

src/support/allocators/zeroafterfree.h

src/util/tokenpipe.cpp

src/util/translation.h

src/util/vector.h

src/versionbits.h

src/versionbits_impl.h

src/wallet/external_signer_scriptpubkeyman.h

src/wallet/fees.h

src/wallet/load.h

src/wallet/receive.h

src/wallet/rpc/wallet.h

src/wallet/types.h

src/walletinitinterface.h

src/zmq/zmqabstractnotifier.cpp

Independent explanations by MyBitcoinExplorer. Not affiliated with or endorsed by Bitcoin Core. Guides are educational and do not replace the source or its tests.

Bitcoin Core source © its contributors, distributed under the MIT license. Original notices and bundled third-party licenses are retained in the source tree.