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#!/usr/bin/env python3
# Copyright (c) 2016-2017 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.mininode import P2PInterface, network_thread_start
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
WARN_UNKNOWN_RULES_MINED = "Unknown block versions being mined! It's possible unknown rules are in effect"
WARN_UNKNOWN_RULES_ACTIVE = "unknown new rules activated (versionbit {})".format(VB_UNKNOWN_BIT)
VB_PATTERN = re.compile("^Warning.*versionbit")
class TestNode(P2PInterface):
def on_inv(self, message):
pass
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 = [["-alertnotify=echo %s >> \"" + self.alert_filename + "\""]]
self.setup_nodes()
# Send numblocks blocks via peer with version set.
def send_blocks_with_version(self, peer, numblocks, version):
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)
block.nVersion = version
block.solve()
peer.send_message(msg_block(block))
block_time += 1
height += 1
tip = block.sha256
peer.sync_with_ping()
def test_versionbits_in_alert_file(self):
with open(self.alert_filename, 'r', encoding='utf8') as f:
alert_text = f.read()
assert(VB_PATTERN.match(alert_text))
def run_test(self):
# Setup the p2p connection and start up the network thread.
self.nodes[0].add_p2p_connection(TestNode())
network_thread_start()
# Test logic begins here
self.nodes[0].p2p.wait_for_verack()
# 1. Have the node mine one period worth of blocks
self.nodes[0].generate(VB_PERIOD)
# 2. Now build one period of blocks on the tip, with < VB_THRESHOLD
# blocks signaling some unknown bit.
version = VB_TOP_BITS | (1 << VB_UNKNOWN_BIT)
self.send_blocks_with_version(self.nodes[0].p2p, VB_THRESHOLD - 1, version)
# Fill rest of period with regular version blocks
self.nodes[0].generate(VB_PERIOD - VB_THRESHOLD + 1)
# Check that we're not getting any versionbit-related errors in
# get*info()
assert(not VB_PATTERN.match(self.nodes[0].getmininginfo()["warnings"]))
assert(not VB_PATTERN.match(self.nodes[0].getnetworkinfo()["warnings"]))
# 3. Now build one period of blocks with >= VB_THRESHOLD blocks signaling
# some unknown bit
self.send_blocks_with_version(self.nodes[0].p2p, VB_THRESHOLD, version)
self.nodes[0].generate(VB_PERIOD - VB_THRESHOLD)
# Might not get a versionbits-related alert yet, as we should
# have gotten a different alert due to more than 51/100 blocks
# being of unexpected version.
# Check that get*info() shows some kind of error.
assert(WARN_UNKNOWN_RULES_MINED in self.nodes[0].getmininginfo()["warnings"])
assert(WARN_UNKNOWN_RULES_MINED in self.nodes[0].getnetworkinfo()["warnings"])
# Mine a period worth of expected blocks so the generic block-version warning
# is cleared, and restart the node. This should move the versionbit state
# to ACTIVE.
self.nodes[0].generate(VB_PERIOD)
self.stop_nodes()
# Empty out the alert file
with open(self.alert_filename, 'w', encoding='utf8'):
pass
self.start_nodes()
# Connecting one block should be enough to generate an error.
self.nodes[0].generate(1)
assert(WARN_UNKNOWN_RULES_ACTIVE in self.nodes[0].getmininginfo()["warnings"])
assert(WARN_UNKNOWN_RULES_ACTIVE in self.nodes[0].getnetworkinfo()["warnings"])
self.stop_nodes()
self.test_versionbits_in_alert_file()
# Test framework expects the node to still be running...
self.start_nodes()
if __name__ == '__main__':
VersionBitsWarningTest().main()
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