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#!/usr/bin/env python3
# Copyright (c) 2015-2016 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 BIP65 (CHECKLOCKTIMEVERIFY).
Connect to a single node.
Mine 2 (version 3) blocks (save the coinbases for later).
Generate 98 more version 3 blocks, verify the node accepts.
Mine 749 version 4 blocks, verify the node accepts.
Check that the new CLTV rules are not enforced on the 750th version 4 block.
Check that the new CLTV rules are enforced on the 751st version 4 block.
Mine 199 new version blocks.
Mine 1 old-version block.
Mine 1 new version block.
Mine 1 old version block, see that the node rejects.
"""
from test_framework.test_framework import ComparisonTestFramework
from test_framework.util import *
from test_framework.mininode import CTransaction, NetworkThread
from test_framework.blocktools import create_coinbase, create_block
from test_framework.comptool import TestInstance, TestManager
from test_framework.script import CScript, OP_1NEGATE, OP_CHECKLOCKTIMEVERIFY, OP_DROP
from io import BytesIO
import time
def cltv_invalidate(tx):
'''Modify the signature in vin 0 of the tx to fail CLTV
Prepends -1 CLTV DROP in the scriptSig itself.
'''
tx.vin[0].scriptSig = CScript([OP_1NEGATE, OP_CHECKLOCKTIMEVERIFY, OP_DROP] +
list(CScript(tx.vin[0].scriptSig)))
class BIP65Test(ComparisonTestFramework):
def __init__(self):
super().__init__()
self.num_nodes = 1
def setup_network(self):
# Must set the blockversion for this test
self.nodes = start_nodes(self.num_nodes, self.options.tmpdir,
extra_args=[['-debug', '-whitelist=127.0.0.1', '-blockversion=3']],
binary=[self.options.testbinary])
def run_test(self):
test = TestManager(self, self.options.tmpdir)
test.add_all_connections(self.nodes)
NetworkThread().start() # Start up network handling in another thread
test.run()
def create_transaction(self, node, coinbase, to_address, amount):
from_txid = node.getblock(coinbase)['tx'][0]
inputs = [{ "txid" : from_txid, "vout" : 0}]
outputs = { to_address : amount }
rawtx = node.createrawtransaction(inputs, outputs)
signresult = node.signrawtransaction(rawtx)
tx = CTransaction()
f = BytesIO(hex_str_to_bytes(signresult['hex']))
tx.deserialize(f)
return tx
def get_tests(self):
self.coinbase_blocks = self.nodes[0].generate(2)
height = 3 # height of the next block to build
self.tip = int("0x" + self.nodes[0].getbestblockhash(), 0)
self.nodeaddress = self.nodes[0].getnewaddress()
self.last_block_time = int(time.time())
''' 398 more version 3 blocks '''
test_blocks = []
for i in range(398):
block = create_block(self.tip, create_coinbase(height), self.last_block_time + 1)
block.nVersion = 3
block.rehash()
block.solve()
test_blocks.append([block, True])
self.last_block_time += 1
self.tip = block.sha256
height += 1
yield TestInstance(test_blocks, sync_every_block=False)
''' Mine 749 version 4 blocks '''
test_blocks = []
for i in range(749):
block = create_block(self.tip, create_coinbase(height), self.last_block_time + 1)
block.nVersion = 4
block.rehash()
block.solve()
test_blocks.append([block, True])
self.last_block_time += 1
self.tip = block.sha256
height += 1
yield TestInstance(test_blocks, sync_every_block=False)
'''
Check that the new CLTV rules are not enforced in the 750th
version 3 block.
'''
spendtx = self.create_transaction(self.nodes[0],
self.coinbase_blocks[0], self.nodeaddress, 1.0)
cltv_invalidate(spendtx)
spendtx.rehash()
block = create_block(self.tip, create_coinbase(height), self.last_block_time + 1)
block.nVersion = 4
block.vtx.append(spendtx)
block.hashMerkleRoot = block.calc_merkle_root()
block.rehash()
block.solve()
self.last_block_time += 1
self.tip = block.sha256
height += 1
yield TestInstance([[block, True]])
''' Mine 199 new version blocks on last valid tip '''
test_blocks = []
for i in range(199):
block = create_block(self.tip, create_coinbase(height), self.last_block_time + 1)
block.nVersion = 4
block.rehash()
block.solve()
test_blocks.append([block, True])
self.last_block_time += 1
self.tip = block.sha256
height += 1
yield TestInstance(test_blocks, sync_every_block=False)
''' Mine 1 old version block '''
block = create_block(self.tip, create_coinbase(height), self.last_block_time + 1)
block.nVersion = 3
block.rehash()
block.solve()
self.last_block_time += 1
self.tip = block.sha256
height += 1
yield TestInstance([[block, True]])
''' Mine 1 new version block '''
block = create_block(self.tip, create_coinbase(height), self.last_block_time + 1)
block.nVersion = 4
block.rehash()
block.solve()
self.last_block_time += 1
self.tip = block.sha256
height += 1
yield TestInstance([[block, True]])
'''
Check that the new CLTV rules are enforced in the 951st version 4
block.
'''
spendtx = self.create_transaction(self.nodes[0],
self.coinbase_blocks[1], self.nodeaddress, 1.0)
cltv_invalidate(spendtx)
spendtx.rehash()
block = create_block(self.tip, create_coinbase(height), self.last_block_time + 1)
block.nVersion = 4
block.vtx.append(spendtx)
block.hashMerkleRoot = block.calc_merkle_root()
block.rehash()
block.solve()
self.last_block_time += 1
yield TestInstance([[block, False]])
''' Mine 1 old version block, should be invalid '''
block = create_block(self.tip, create_coinbase(height), self.last_block_time + 1)
block.nVersion = 3
block.rehash()
block.solve()
self.last_block_time += 1
yield TestInstance([[block, False]])
if __name__ == '__main__':
BIP65Test().main()