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#!/usr/bin/env python3
# Copyright (c) 2017-2021 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 a pre-segwit node upgrading to segwit consensus"""
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import (
assert_equal,
softfork_active,
)
import os
class SegwitUpgradeTest(BitcoinTestFramework):
def set_test_params(self):
self.setup_clean_chain = True
self.num_nodes = 1
self.extra_args = [["-testactivationheight=segwit@10"]]
def run_test(self):
"""A pre-segwit node with insufficiently validated blocks needs to redownload blocks"""
self.log.info("Testing upgrade behaviour for pre-segwit node to segwit rules")
node = self.nodes[0]
# Node hasn't been used or connected yet
assert_equal(node.getblockcount(), 0)
assert not softfork_active(node, "segwit")
# Generate 8 blocks without witness data
self.generate(node, 8)
assert_equal(node.getblockcount(), 8)
self.stop_node(0)
# Restarting the node (with segwit activation height set to 5) should result in a shutdown
# because the blockchain consists of 3 insufficiently validated blocks per segwit consensus rules.
node.assert_start_raises_init_error(
extra_args=["-testactivationheight=segwit@5"],
expected_msg=": Witness data for blocks after height 5 requires "
f"validation. Please restart with -reindex..{os.linesep}"
"Please restart with -reindex or -reindex-chainstate to recover.",
)
# As directed, the user restarts the node with -reindex
self.start_node(0, extra_args=["-reindex", "-testactivationheight=segwit@5"])
# With the segwit consensus rules, the node is able to validate only up to block 4
assert_equal(node.getblockcount(), 4)
# The upgraded node should now have segwit activated
assert softfork_active(node, "segwit")
if __name__ == '__main__':
SegwitUpgradeTest().main()
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