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#!/usr/bin/env python3
# Copyright (c) 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.
from test_framework.mininode import *
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import *
import time
from test_framework.blocktools import create_block, create_coinbase
'''
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.
'''
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
# TestNode: bare-bones "peer". Used mostly as a conduit for a test to sending
# p2p messages to a node, generating the messages in the main testing logic.
class TestNode(NodeConnCB):
def __init__(self):
NodeConnCB.__init__(self)
self.connection = None
self.ping_counter = 1
self.last_pong = msg_pong()
def add_connection(self, conn):
self.connection = conn
def on_inv(self, conn, message):
pass
# Wrapper for the NodeConn's send_message function
def send_message(self, message):
self.connection.send_message(message)
def on_pong(self, conn, message):
self.last_pong = message
# Sync up with the node after delivery of a block
def sync_with_ping(self, timeout=30):
self.connection.send_message(msg_ping(nonce=self.ping_counter))
received_pong = False
sleep_time = 0.05
while not received_pong and timeout > 0:
time.sleep(sleep_time)
timeout -= sleep_time
with mininode_lock:
if self.last_pong.nonce == self.ping_counter:
received_pong = True
self.ping_counter += 1
return received_pong
class VersionBitsWarningTest(BitcoinTestFramework):
def setup_chain(self):
initialize_chain_clean(self.options.tmpdir, 1)
def setup_network(self):
self.nodes = []
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') as f:
pass
self.node_options = ["-debug", "-logtimemicros=1", "-alertnotify=echo %s >> \"" + self.alert_filename + "\""]
self.nodes.append(start_node(0, self.options.tmpdir, self.node_options))
import re
self.vb_pattern = re.compile("^Warning.*versionbit")
# Send numblocks blocks via peer with nVersionToUse set.
def send_blocks_with_version(self, peer, numblocks, nVersionToUse):
tip = self.nodes[0].getbestblockhash()
height = self.nodes[0].getblockcount()
block_time = self.nodes[0].getblockheader(tip)["time"]+1
tip = int(tip, 16)
for i in range(numblocks):
block = create_block(tip, create_coinbase(height+1), block_time)
block.nVersion = nVersionToUse
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') as f:
alert_text = f.read()
assert(self.vb_pattern.match(alert_text))
def run_test(self):
# Setup the p2p connection and start up the network thread.
test_node = TestNode()
connections = []
connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], test_node))
test_node.add_connection(connections[0])
NetworkThread().start() # Start up network handling in another thread
# Test logic begins here
test_node.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.
nVersion = VB_TOP_BITS | (1<<VB_UNKNOWN_BIT)
self.send_blocks_with_version(test_node, VB_THRESHOLD-1, nVersion)
# 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
# getinfo()
assert(not self.vb_pattern.match(self.nodes[0].getinfo()["errors"]))
# 3. Now build one period of blocks with >= VB_THRESHOLD blocks signaling
# some unknown bit
self.send_blocks_with_version(test_node, VB_THRESHOLD, nVersion)
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 getinfo() shows some kind of error.
assert(len(self.nodes[0].getinfo()["errors"]) != 0)
# 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)
stop_node(self.nodes[0], 0)
wait_bitcoinds()
# Empty out the alert file
with open(self.alert_filename, 'w') as f:
pass
self.nodes[0] = start_node(0, self.options.tmpdir, ["-debug", "-logtimemicros=1", "-alertnotify=echo %s >> \"" + self.alert_filename + "\""])
# Connecting one block should be enough to generate an error.
self.nodes[0].generate(1)
assert(len(self.nodes[0].getinfo()["errors"]) != 0)
stop_node(self.nodes[0], 0)
wait_bitcoinds()
self.test_versionbits_in_alert_file()
# Test framework expects the node to still be running...
self.nodes[0] = start_node(0, self.options.tmpdir, ["-debug", "-logtimemicros=1", "-alertnotify=echo %s >> \"" + self.alert_filename + "\""])
if __name__ == '__main__':
VersionBitsWarningTest().main()
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