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feature_nulldummy.py
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#!/usr/bin/env python3
# Copyright (c) 2016-2021 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 NULLDUMMY softfork.
Connect to a single node.
Generate 2 blocks (save the coinbases for later).
Generate COINBASE_MATURITY (CB) more blocks to ensure the coinbases are mature.
[Policy/Consensus] Check that NULLDUMMY compliant transactions are accepted in block CB + 3.
[Policy] Check that non-NULLDUMMY transactions are rejected before activation.
[Consensus] Check that the new NULLDUMMY rules are not enforced on block CB + 4.
[Policy/Consensus] Check that the new NULLDUMMY rules are enforced on block CB + 5.
"""
import time
from test_framework.blocktools import (
COINBASE_MATURITY,
NORMAL_GBT_REQUEST_PARAMS,
add_witness_commitment,
create_block,
create_transaction,
)
from test_framework.messages import CTransaction
from test_framework.script import (
OP_0,
OP_TRUE,
)
from test_framework.test_framework import BitcoinTestFramework
from test_framework import util
from test_framework.util import (
assert_equal,
assert_raises_rpc_error,
)
NULLDUMMY_ERROR = "non-mandatory-script-verify-flag (Dummy CHECKMULTISIG argument must be zero)"
def invalidate_nulldummy_tx(tx):
"""Transform a NULLDUMMY compliant tx (i.e. scriptSig starts with OP_0)
to be non-NULLDUMMY compliant by replacing the dummy with OP_TRUE"""
assert_equal(tx.vin[0].scriptSig[0], OP_0)
tx.vin[0].scriptSig = bytes([OP_TRUE]) + tx.vin[0].scriptSig[1:]
tx.rehash()
class NULLDUMMYTest(BitcoinTestFramework):
def set_test_params(self):
self.num_nodes = 1
self.setup_clean_chain = True
# This script tests NULLDUMMY activation, which is part of the 'segwit' deployment, so we go through
# normal segwit activation here (and don't use the default always-on behaviour).
self.extra_args = [[
f'-testactivationheight=segwit@{COINBASE_MATURITY + 5}',
'-addresstype=legacy',
'-par=1', # Use only one script thread to get the exact reject reason for testing
]]
def skip_test_if_missing_module(self):
self.skip_if_no_wallet()
def run_test(self):
util.node_fastmerkle = self.nodes[0]
self.nodes[0].createwallet(wallet_name='wmulti', disable_private_keys=True)
wmulti = self.nodes[0].get_wallet_rpc('wmulti')
w0 = self.nodes[0].get_wallet_rpc(self.default_wallet_name)
self.address = w0.getnewaddress()
self.pubkey = w0.getaddressinfo(self.address)['pubkey']
self.ms_address = wmulti.addmultisigaddress(1, [self.pubkey])['address']
self.wit_address = w0.getnewaddress(address_type='p2sh-segwit')
self.wit_ms_address = wmulti.addmultisigaddress(1, [self.pubkey], '', 'p2sh-segwit')['address']
if not self.options.descriptors:
# Legacy wallets need to import these so that they are watched by the wallet. This is unnecessary (and does not need to be tested) for descriptor wallets
wmulti.importaddress(self.ms_address)
wmulti.importaddress(self.wit_ms_address)
self.coinbase_blocks = self.generate(self.nodes[0], 2) # block height = 2
coinbase_txid = []
for i in self.coinbase_blocks:
coinbase_txid.append(self.nodes[0].getblock(i)['tx'][0])
self.generate(self.nodes[0], COINBASE_MATURITY) # block height = COINBASE_MATURITY + 2
self.lastblockhash = self.nodes[0].getbestblockhash()
self.lastblockheight = COINBASE_MATURITY + 2
self.lastblocktime = int(time.time()) + self.lastblockheight
self.log.info(f"Test 1: NULLDUMMY compliant base transactions should be accepted to mempool and mined before activation [{COINBASE_MATURITY + 3}]")
coinbase_value = self.nodes[0].gettxout(coinbase_txid[0], 0)["value"]
test1txs = [create_transaction(self.nodes[0], coinbase_txid[0], self.ms_address, amount=49, fee=coinbase_value-49)]
txid1 = self.nodes[0].sendrawtransaction(test1txs[0].serialize_with_witness().hex(), 0)
test1txs.append(create_transaction(self.nodes[0], txid1, self.ms_address, amount=48, fee=49-48))
txid2 = self.nodes[0].sendrawtransaction(test1txs[1].serialize_with_witness().hex(), 0)
coinbase_value = self.nodes[0].gettxout(coinbase_txid[1], 0)["value"]
test1txs.append(create_transaction(self.nodes[0], coinbase_txid[1], self.wit_ms_address, amount=49, fee=coinbase_value-49))
txid3 = self.nodes[0].sendrawtransaction(test1txs[2].serialize_with_witness().hex(), 0)
self.block_submit(self.nodes[0], test1txs, accept=True)
self.log.info("Test 2: Non-NULLDUMMY base multisig transaction should not be accepted to mempool before activation")
test2tx = create_transaction(self.nodes[0], txid2, self.ms_address, amount=47, fee=48-47)
invalidate_nulldummy_tx(test2tx)
assert_raises_rpc_error(-26, NULLDUMMY_ERROR, self.nodes[0].sendrawtransaction, test2tx.serialize_with_witness().hex(), 0)
self.log.info(f"Test 3: Non-NULLDUMMY base transactions should be accepted in a block before activation [{COINBASE_MATURITY + 4}]")
self.block_submit(self.nodes[0], [test2tx], accept=True)
self.log.info("Test 4: Non-NULLDUMMY base multisig transaction is invalid after activation")
test4tx = create_transaction(self.nodes[0], test2tx.hash, self.address, amount=46, fee=47-46)
test6txs = [CTransaction(test4tx)]
invalidate_nulldummy_tx(test4tx)
assert_raises_rpc_error(-26, NULLDUMMY_ERROR, self.nodes[0].sendrawtransaction, test4tx.serialize_with_witness().hex(), 0)
self.block_submit(self.nodes[0], [test4tx], accept=False)
self.log.info("Test 5: Non-NULLDUMMY P2WSH multisig transaction invalid after activation")
test5tx = create_transaction(self.nodes[0], txid3, self.wit_address, amount=48, fee=49-48)
test6txs.append(CTransaction(test5tx))
test5tx.wit.vtxinwit[0].scriptWitness.stack[0] = b'\x01'
assert_raises_rpc_error(-26, NULLDUMMY_ERROR, self.nodes[0].sendrawtransaction, test5tx.serialize_with_witness().hex(), 0)
self.block_submit(self.nodes[0], [test5tx], with_witness=True, accept=False)
self.log.info(f"Test 6: NULLDUMMY compliant base/witness transactions should be accepted to mempool and in block after activation [{COINBASE_MATURITY + 5}]")
for i in test6txs:
self.nodes[0].sendrawtransaction(i.serialize_with_witness().hex(), 0)
self.block_submit(self.nodes[0], test6txs, with_witness=True, accept=True)
def block_submit(self, node, txs, *, with_witness=False, accept):
tmpl = node.getblocktemplate(NORMAL_GBT_REQUEST_PARAMS)
assert_equal(tmpl['previousblockhash'], self.lastblockhash)
assert_equal(tmpl['height'], self.lastblockheight + 1)
block = create_block(tmpl=tmpl, ntime=self.lastblocktime + 1, txlist=txs)
if with_witness:
add_witness_commitment(block)
block.solve()
assert_equal(None if accept else NULLDUMMY_ERROR, node.submitblock(block.serialize().hex()))
if accept:
assert_equal(node.getbestblockhash(), block.hash)
self.lastblockhash = block.hash
self.lastblocktime += 1
self.lastblockheight += 1
else:
assert_equal(node.getbestblockhash(), self.lastblockhash)
if __name__ == '__main__':
NULLDUMMYTest().main()