You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
87 lines
3.7 KiB
87 lines
3.7 KiB
#!/usr/bin/env python3 |
|
# Copyright (c) 2019-2020 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 that we reject low difficulty headers to prevent our block tree from filling up with useless bloat""" |
|
|
|
from test_framework.messages import ( |
|
CBlockHeader, |
|
from_hex, |
|
) |
|
from test_framework.p2p import ( |
|
P2PInterface, |
|
msg_headers, |
|
) |
|
from test_framework.test_framework import BitcoinTestFramework |
|
|
|
import os |
|
|
|
|
|
class RejectLowDifficultyHeadersTest(BitcoinTestFramework): |
|
def set_test_params(self): |
|
self.setup_clean_chain = True |
|
self.chain = 'testnet3' # Use testnet chain because it has an early checkpoint |
|
self.num_nodes = 2 |
|
|
|
def add_options(self, parser): |
|
parser.add_argument( |
|
'--datafile', |
|
default='data/blockheader_testnet3.hex', |
|
help='Test data file (default: %(default)s)', |
|
) |
|
|
|
def run_test(self): |
|
self.log.info("Read headers data") |
|
self.headers_file_path = os.path.join(os.path.dirname(os.path.realpath(__file__)), self.options.datafile) |
|
with open(self.headers_file_path, encoding='utf-8') as headers_data: |
|
h_lines = [l.strip() for l in headers_data.readlines()] |
|
|
|
# The headers data is taken from testnet3 for early blocks from genesis until the first checkpoint. There are |
|
# two headers with valid POW at height 1 and 2, forking off from genesis. They are indicated by the FORK_PREFIX. |
|
FORK_PREFIX = 'fork:' |
|
self.headers = [l for l in h_lines if not l.startswith(FORK_PREFIX)] |
|
self.headers_fork = [l[len(FORK_PREFIX):] for l in h_lines if l.startswith(FORK_PREFIX)] |
|
|
|
self.headers = [from_hex(CBlockHeader(), h) for h in self.headers] |
|
self.headers_fork = [from_hex(CBlockHeader(), h) for h in self.headers_fork] |
|
|
|
self.log.info("Feed all non-fork headers, including and up to the first checkpoint") |
|
peer_checkpoint = self.nodes[0].add_p2p_connection(P2PInterface()) |
|
peer_checkpoint.send_and_ping(msg_headers(self.headers)) |
|
assert { |
|
'height': 546, |
|
'hash': '000000002a936ca763904c3c35fce2f3556c559c0214345d31b1bcebf76acb70', |
|
'branchlen': 546, |
|
'status': 'headers-only', |
|
} in self.nodes[0].getchaintips() |
|
|
|
self.log.info("Feed all fork headers (fails due to checkpoint)") |
|
with self.nodes[0].assert_debug_log(['bad-fork-prior-to-checkpoint']): |
|
peer_checkpoint.send_message(msg_headers(self.headers_fork)) |
|
peer_checkpoint.wait_for_disconnect() |
|
|
|
self.log.info("Feed all fork headers (succeeds without checkpoint)") |
|
# On node 0 it succeeds because checkpoints are disabled |
|
self.restart_node(0, extra_args=['-nocheckpoints']) |
|
peer_no_checkpoint = self.nodes[0].add_p2p_connection(P2PInterface()) |
|
peer_no_checkpoint.send_and_ping(msg_headers(self.headers_fork)) |
|
assert { |
|
"height": 2, |
|
"hash": "00000000b0494bd6c3d5ff79c497cfce40831871cbf39b1bc28bd1dac817dc39", |
|
"branchlen": 2, |
|
"status": "headers-only", |
|
} in self.nodes[0].getchaintips() |
|
|
|
# On node 1 it succeeds because no checkpoint has been reached yet by a chain tip |
|
peer_before_checkpoint = self.nodes[1].add_p2p_connection(P2PInterface()) |
|
peer_before_checkpoint.send_and_ping(msg_headers(self.headers_fork)) |
|
assert { |
|
"height": 2, |
|
"hash": "00000000b0494bd6c3d5ff79c497cfce40831871cbf39b1bc28bd1dac817dc39", |
|
"branchlen": 2, |
|
"status": "headers-only", |
|
} in self.nodes[1].getchaintips() |
|
|
|
|
|
if __name__ == '__main__': |
|
RejectLowDifficultyHeadersTest().main()
|
|
|