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#!/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 the generation of UTXO snapshots using `dumptxoutset`.
"""
from test_framework.blocktools import COINBASE_MATURITY
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import assert_equal, assert_raises_rpc_error
import hashlib
from pathlib import Path
class DumptxoutsetTest(BitcoinTestFramework):
def set_test_params(self):
self.setup_clean_chain = True
self.num_nodes = 1
def run_test(self):
"""Test a trivial usage of the dumptxoutset RPC command."""
node = self.nodes[0]
mocktime = node.getblockheader(node.getblockhash(0))['time'] + 1
node.setmocktime(mocktime)
self.generate(node, COINBASE_MATURITY)
FILENAME = 'txoutset.dat'
out = node.dumptxoutset(FILENAME)
expected_path = Path(node.datadir) / self.chain / FILENAME
assert expected_path.is_file()
assert_equal(out['coins_written'], 100)
assert_equal(out['base_height'], 100)
assert_equal(out['path'], str(expected_path))
# Blockhash should be deterministic based on mocked time.
assert_equal(
out['base_hash'],
'6fd417acba2a8738b06fee43330c50d58e6a725046c3d843c8dd7e51d46d1ed6')
with open(str(expected_path), 'rb') as f:
digest = hashlib.sha256(f.read()).hexdigest()
# UTXO snapshot hash should be deterministic based on mocked time.
assert_equal(
digest, '7ae82c986fa5445678d2a21453bb1c86d39e47af13da137640c2b1cf8093691c')
# Specifying a path to an existing file will fail.
assert_raises_rpc_error(
-8, '{} already exists'.format(FILENAME), node.dumptxoutset, FILENAME)
if __name__ == '__main__':
DumptxoutsetTest().main()
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