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#!/usr/bin/env python3
# Copyright (c) 2016-2022 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 version bits warning system.
Generate chains with block versions that appear to be signalling unknown
soft-forks, and test that warning alerts are generated.
"""
import os
import re
from test_framework.blocktools import create_block, create_coinbase
from test_framework.messages import msg_block
from test_framework.p2p import P2PInterface
from test_framework.test_framework import BitcoinTestFramework
VB_PERIOD = 144 # versionbits period length for regtest
VB_THRESHOLD = 108 # versionbits activation threshold for regtest
VB_TOP_BITS = 0x20000000
VB_UNKNOWN_BIT = 27 # Choose a bit unassigned to any deployment
VB_UNKNOWN_VERSION = VB_TOP_BITS | (1 << VB_UNKNOWN_BIT)
WARN_UNKNOWN_RULES_ACTIVE = f"Unknown new rules activated (versionbit {VB_UNKNOWN_BIT})"
VB_PATTERN = re.compile("Unknown new rules activated.*versionbit")
class VersionBitsWarningTest(BitcoinTestFramework):
def set_test_params(self):
self.setup_clean_chain = True
self.num_nodes = 1
def setup_network(self):
self.alert_filename = os.path.join(self.options.tmpdir, "alert.txt")
# Open and close to create zero-length file
with open(self.alert_filename, 'w', encoding='utf8'):
pass
self.extra_args = [[f"-alertnotify=echo %s >> \"{self.alert_filename}\""]]
self.setup_nodes()
def send_blocks_with_version(self, peer, numblocks, version):
"""Send numblocks blocks to peer with version set"""
tip = self.nodes[0].getbestblockhash()
height = self.nodes[0].getblockcount()
block_time = self.nodes[0].getblockheader(tip)["time"] + 1
tip = int(tip, 16)
for _ in range(numblocks):
block = create_block(tip, create_coinbase(height + 1), block_time, version=version)
block.solve()
peer.send_message(msg_block(block))
block_time += 1
height += 1
tip = block.sha256
peer.sync_with_ping()
def versionbits_in_alert_file(self):
"""Test that the versionbits warning has been written to the alert file."""
with open(self.alert_filename, 'r', encoding='utf8') as f:
alert_text = f.read()
return VB_PATTERN.search(alert_text) is not None
def run_test(self):
node = self.nodes[0]
peer = node.add_p2p_connection(P2PInterface())
node_deterministic_address = node.get_deterministic_priv_key().address
# Mine one period worth of blocks
self.generatetoaddress(node, VB_PERIOD, node_deterministic_address)
self.log.info("Check that there is no warning if previous VB_BLOCKS have <VB_THRESHOLD blocks with unknown versionbits version.")
# Build one period of blocks with < VB_THRESHOLD blocks signaling some unknown bit
self.send_blocks_with_version(peer, VB_THRESHOLD - 1, VB_UNKNOWN_VERSION)
self.generatetoaddress(node, VB_PERIOD - VB_THRESHOLD + 1, node_deterministic_address)
# Check that we're not getting any versionbit-related errors in get*info()
assert not VB_PATTERN.match(",".join(node.getmininginfo()["warnings"]))
assert not VB_PATTERN.match(",".join(node.getnetworkinfo()["warnings"]))
# Build one period of blocks with VB_THRESHOLD blocks signaling some unknown bit
self.send_blocks_with_version(peer, VB_THRESHOLD, VB_UNKNOWN_VERSION)
self.generatetoaddress(node, VB_PERIOD - VB_THRESHOLD, node_deterministic_address)
self.log.info("Check that there is a warning if previous VB_BLOCKS have >=VB_THRESHOLD blocks with unknown versionbits version.")
# Mine a period worth of expected blocks so the generic block-version warning
# is cleared. This will move the versionbit state to ACTIVE.
self.generatetoaddress(node, VB_PERIOD, node_deterministic_address)
# Stop-start the node. This is required because bitcoind will only warn once about unknown versions or unknown rules activating.
self.restart_node(0)
# Generating one block guarantees that we'll get out of IBD
self.generatetoaddress(node, 1, node_deterministic_address)
self.wait_until(lambda: not node.getblockchaininfo()['initialblockdownload'])
# Generating one more block will be enough to generate an error.
self.generatetoaddress(node, 1, node_deterministic_address)
# Check that get*info() shows the versionbits unknown rules warning
assert WARN_UNKNOWN_RULES_ACTIVE in ",".join(node.getmininginfo()["warnings"])
assert WARN_UNKNOWN_RULES_ACTIVE in ",".join(node.getnetworkinfo()["warnings"])
# Check that the alert file shows the versionbits unknown rules warning
self.wait_until(lambda: self.versionbits_in_alert_file())
if __name__ == '__main__':
VersionBitsWarningTest(__file__).main()
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