165 lines
6.6 KiB
Python
Executable file
165 lines
6.6 KiB
Python
Executable file
#!/usr/bin/env python3
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# Copyright (c) 2015-2019 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 BIP65 (CHECKLOCKTIMEVERIFY).
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Test that the CHECKLOCKTIMEVERIFY soft-fork activates at (regtest) block height
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1351.
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"""
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from test_framework.blocktools import create_coinbase, create_block, create_transaction
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from test_framework.messages import CTransaction, msg_block, ToHex
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from test_framework.mininode import P2PInterface
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from test_framework.script import CScript, OP_1NEGATE, OP_CHECKLOCKTIMEVERIFY, OP_DROP, CScriptNum
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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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hex_str_to_bytes,
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)
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from io import BytesIO
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CLTV_HEIGHT = 1351
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# Reject codes that we might receive in this test
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REJECT_INVALID = 16
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REJECT_NONSTANDARD = 64
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def cltv_invalidate(tx):
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'''Modify the signature in vin 0 of the tx to fail CLTV
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Prepends -1 CLTV DROP in the scriptSig itself.
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TODO: test more ways that transactions using CLTV could be invalid (eg
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locktime requirements fail, sequence time requirements fail, etc).
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'''
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tx.vin[0].scriptSig = CScript([OP_1NEGATE, OP_CHECKLOCKTIMEVERIFY, OP_DROP] +
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list(CScript(tx.vin[0].scriptSig)))
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def cltv_validate(node, tx, height):
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'''Modify the signature in vin 0 of the tx to pass CLTV
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Prepends <height> CLTV DROP in the scriptSig, and sets
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the locktime to height'''
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tx.vin[0].nSequence = 0
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tx.nLockTime = height
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# Need to re-sign, since nSequence and nLockTime changed
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signed_result = node.signrawtransactionwithwallet(ToHex(tx))
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new_tx = CTransaction()
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new_tx.deserialize(BytesIO(hex_str_to_bytes(signed_result['hex'])))
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new_tx.vin[0].scriptSig = CScript([CScriptNum(height), OP_CHECKLOCKTIMEVERIFY, OP_DROP] +
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list(CScript(new_tx.vin[0].scriptSig)))
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return new_tx
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class BIP65Test(BitcoinTestFramework):
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def set_test_params(self):
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self.num_nodes = 1
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self.extra_args = [[
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'-whitelist=127.0.0.1',
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'-par=1', # Use only one script thread to get the exact reject reason for testing
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'-acceptnonstdtxn=1', # cltv_invalidate is nonstandard
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]]
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self.setup_clean_chain = True
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self.rpc_timeout = 120
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def skip_test_if_missing_module(self):
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self.skip_if_no_wallet()
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def test_cltv_info(self, *, is_active):
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assert_equal(self.nodes[0].getblockchaininfo()['softforks']['bip65'],
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{
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"active": is_active,
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"height": CLTV_HEIGHT,
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"type": "buried",
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},
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)
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def skip_test_if_missing_module(self):
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self.skip_if_no_wallet()
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def run_test(self):
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self.nodes[0].add_p2p_connection(P2PInterface())
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self.test_cltv_info(is_active=False)
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self.log.info("Mining %d blocks", CLTV_HEIGHT - 2)
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self.coinbase_txids = [self.nodes[0].getblock(b)['tx'][0] for b in self.nodes[0].generate(CLTV_HEIGHT - 2)]
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self.nodeaddress = self.nodes[0].getnewaddress()
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self.log.info("Test that an invalid-according-to-CLTV transaction can still appear in a block")
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spendtx = create_transaction(self.nodes[0], self.coinbase_txids[0],
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self.nodeaddress, amount=1.0)
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cltv_invalidate(spendtx)
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spendtx.rehash()
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tip = self.nodes[0].getbestblockhash()
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block_time = self.nodes[0].getblockheader(tip)['mediantime'] + 1
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block = create_block(int(tip, 16), create_coinbase(CLTV_HEIGHT - 1), block_time)
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block.nVersion = 3
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block.vtx.append(spendtx)
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block.hashMerkleRoot = block.calc_merkle_root()
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block.solve()
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self.test_cltv_info(is_active=False) # Not active as of current tip and next block does not need to obey rules
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self.nodes[0].p2p.send_and_ping(msg_block(block))
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self.test_cltv_info(is_active=True) # Not active as of current tip, but next block must obey rules
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assert_equal(self.nodes[0].getbestblockhash(), block.hash)
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self.log.info("Test that blocks must now be at least version 4")
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tip = block.sha256
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block_time += 1
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block = create_block(tip, create_coinbase(CLTV_HEIGHT), block_time)
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block.nVersion = 3
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block.solve()
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with self.nodes[0].assert_debug_log(expected_msgs=['{}, bad-version(0x00000003)'.format(block.hash)]):
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self.nodes[0].p2p.send_and_ping(msg_block(block))
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assert_equal(int(self.nodes[0].getbestblockhash(), 16), tip)
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self.nodes[0].p2p.sync_with_ping()
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self.log.info("Test that invalid-according-to-cltv transactions cannot appear in a block")
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block.nVersion = 4
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spendtx = create_transaction(self.nodes[0], self.coinbase_txids[1],
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self.nodeaddress, amount=0.1)
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cltv_invalidate(spendtx)
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spendtx.rehash()
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# First we show that this tx is valid except for CLTV by getting it
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# rejected from the mempool for exactly that reason.
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assert_equal(
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[{'txid': spendtx.hash, 'allowed': False, 'reject-reason': '64: non-mandatory-script-verify-flag (Negative locktime)'}],
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self.nodes[0].testmempoolaccept(rawtxs=[spendtx.serialize().hex()], maxfeerate=0)
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)
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# Now we verify that a block with this transaction is also invalid.
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block.vtx.append(spendtx)
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block.hashMerkleRoot = block.calc_merkle_root()
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block.solve()
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with self.nodes[0].assert_debug_log(expected_msgs=['CheckInputs on {} failed with non-mandatory-script-verify-flag (Negative locktime)'.format(block.vtx[-1].hash)]):
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self.nodes[0].p2p.send_and_ping(msg_block(block))
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assert_equal(int(self.nodes[0].getbestblockhash(), 16), tip)
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self.nodes[0].p2p.sync_with_ping()
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self.log.info("Test that a version 4 block with a valid-according-to-CLTV transaction is accepted")
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spendtx = cltv_validate(self.nodes[0], spendtx, CLTV_HEIGHT - 1)
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spendtx.rehash()
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block.vtx.pop(1)
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block.vtx.append(spendtx)
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block.hashMerkleRoot = block.calc_merkle_root()
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block.solve()
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self.test_cltv_info(is_active=True) # Not active as of current tip, but next block must obey rules
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self.nodes[0].p2p.send_and_ping(msg_block(block))
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self.test_cltv_info(is_active=True) # Active as of current tip
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assert_equal(int(self.nodes[0].getbestblockhash(), 16), block.sha256)
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if __name__ == '__main__':
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BIP65Test().main()
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