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.

5,029 bytes · SHA-256 bbae2541e5cdc7da… · View upstream ↗

1#!/usr/bin/env python3
2# Copyright (c) 2020-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"""Test transaction relay behavior during IBD:
6- Set fee filters to MAX_MONEY
7- Don't request transactions
8- Ignore all transaction messages
9"""
10
11from decimal import Decimal
12import time
13
14from test_framework.blocktools import create_block
15from test_framework.messages import (
16    CInv,
17    COIN,
18    CTransaction,
19    from_hex,
20    msg_inv,
21    msg_tx,
22    MSG_WTX,
23)
24from test_framework.p2p import (
25    NONPREF_PEER_TX_DELAY,
26    P2PDataStore,
27    P2PInterface,
28    p2p_lock,
29)
30from test_framework.test_framework import BitcoinTestFramework
31
32MAX_FEE_FILTER = Decimal(9936506) / COIN
33NORMAL_FEE_FILTER = Decimal(10) / COIN
34
35
36class P2PIBDTxRelayTest(BitcoinTestFramework):
37    def set_test_params(self):
38        self.setup_clean_chain = True
39        self.num_nodes = 2
40        self.extra_args = [
41            ["-minrelaytxfee={:.8f}".format(NORMAL_FEE_FILTER)],
42            ["-minrelaytxfee={:.8f}".format(NORMAL_FEE_FILTER)],
43        ]
44
45    def run_test(self):
46        self.log.info("Check that nodes set minfilter to MAX_MONEY while still in IBD")
47        for node in self.nodes:
48            assert node.getblockchaininfo()['initialblockdownload']
49            self.wait_until(lambda: all(peer['minfeefilter'] == MAX_FEE_FILTER for peer in node.getpeerinfo()))
50
51        self.nodes[0].setmocktime(int(time.time()))
52        self.log.info("Mine one old block so we stay in IBD, then remember its coinbase wtxid")
53        block = create_block(int(self.nodes[0].getbestblockhash(), 16), height=1, ntime=int(time.time()) - 2 * 24 * 60 * 60)
54        block.solve()
55        self.nodes[0].submitblock(block.serialize().hex())
56        assert self.nodes[0].getblockchaininfo()['initialblockdownload']
57        # BlockConnected is async. Sync while in IBD so a delayed event cannot
58        # add ibd_wtxid to the recently-confirmed filter.
59        self.nodes[0].syncwithvalidationinterfacequeue()
60        ibd_wtxid = int(self.nodes[0].getblock(f"{block.hash_int:064x}", 2)["tx"][0]["hash"], 16)
61
62        self.log.info("Check that nodes don't send getdatas for transactions while still in IBD")
63        peer_inver = self.nodes[0].add_p2p_connection(P2PDataStore())
64        txid = 0xdeadbeef
65        peer_inver.send_and_ping(msg_inv([CInv(t=MSG_WTX, h=txid)]))
66        # The node should not send a getdata, but if it did, it would first delay 2 seconds
67        self.nodes[0].bumpmocktime(NONPREF_PEER_TX_DELAY)
68        peer_inver.sync_with_ping()
69        with p2p_lock:
70            assert txid not in peer_inver.getdata_requests
71        self.nodes[0].disconnect_p2ps()
72
73        self.log.info("Check that nodes don't process unsolicited transactions while still in IBD")
74        # A transaction hex pulled from tx_valid.json. There are no valid transactions since no UTXOs
75        # exist yet, but it should be a well-formed transaction.
76        rawhex = "0100000001b14bdcbc3e01bdaad36cc08e81e69c82e1060bc14e518db2b49aa43ad90ba260000000004a01ff473" + \
77            "04402203f16c6f40162ab686621ef3000b04e75418a0c0cb2d8aebeac894ae360ac1e780220ddc15ecdfc3507ac48e168" + \
78            "1a33eb60996631bf6bf5bc0a0682c4db743ce7ca2b01ffffffff0140420f00000000001976a914660d4ef3a743e3e696a" + \
79            "d990364e555c271ad504b88ac00000000"
80        assert self.nodes[1].decoderawtransaction(rawhex) # returns a dict, should not throw
81        tx = from_hex(CTransaction(), rawhex)
82        peer_txer = self.nodes[0].add_p2p_connection(P2PInterface())
83        with self.nodes[0].assert_debug_log(expected_msgs=["received: tx"], unexpected_msgs=["was not accepted"]):
84            peer_txer.send_and_ping(msg_tx(tx))
85        self.nodes[0].disconnect_p2ps()
86
87        # Come out of IBD by generating a block
88        self.generate(self.nodes[0], 1)
89
90        self.log.info("Check that nodes reset minfilter after coming out of IBD")
91        for node in self.nodes:
92            assert not node.getblockchaininfo()['initialblockdownload']
93            self.wait_until(lambda: all(peer['minfeefilter'] == NORMAL_FEE_FILTER for peer in node.getpeerinfo()))
94
95        self.log.info("Check that txs confirmed during IBD are not in the recently-confirmed filter once out of ibd")
96        peer_inver = self.nodes[0].add_p2p_connection(P2PDataStore())
97        peer_inver.send_and_ping(msg_inv([CInv(t=MSG_WTX, h=ibd_wtxid)]))
98        self.nodes[0].bumpmocktime(NONPREF_PEER_TX_DELAY)
99        peer_inver.wait_for_getdata([ibd_wtxid])
100        self.nodes[0].disconnect_p2ps()
101
102        self.log.info("Check that nodes process the same transaction, even when unsolicited, when no longer in IBD")
103        peer_txer = self.nodes[0].add_p2p_connection(P2PInterface())
104        with self.nodes[0].assert_debug_log(expected_msgs=["was not accepted"]):
105            peer_txer.send_and_ping(msg_tx(tx))
106
107if __name__ == '__main__':
108    P2PIBDTxRelayTest(__file__).main()
109

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.