bitcoin/test/functional/feature_filelock.py

#!/usr/bin/env python3
# Copyright (c) 2018-2021 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
"""Check that it's not possible to start a second bitcoind instance using the same datadir or wallet."""
import os
import random
import string

from test_framework.test_framework import BitcoinTestFramework
from test_framework.test_node import ErrorMatch

class FilelockTest(BitcoinTestFramework):
    def set_test_params(self):
        self.setup_clean_chain = True
        self.num_nodes = 2

    def setup_network(self):
        self.add_nodes(self.num_nodes, extra_args=None)
        self.nodes[0].start()
        self.nodes[0].wait_for_rpc_connection()

    def run_test(self):
        datadir = os.path.join(self.nodes[0].datadir, self.chain)
        self.log.info(f"Using datadir {datadir}")

        self.log.info("Check that we can't start a second bitcoind instance using the same datadir")
        expected_msg = f"Error: Cannot obtain a lock on data directory {datadir}. {self.config['environment']['PACKAGE_NAME']} is probably already running."
        self.nodes[1].assert_start_raises_init_error(extra_args=[f'-datadir={self.nodes[0].datadir}', '-noserver'], expected_msg=expected_msg)

        if self.is_wallet_compiled():
            def check_wallet_filelock(descriptors):
                wallet_name = ''.join([random.choice(string.ascii_lowercase) for _ in range(6)])
                self.nodes[0].createwallet(wallet_name=wallet_name, descriptors=descriptors)
                wallet_dir = os.path.join(datadir, 'wallets')
                self.log.info("Check that we can't start a second bitcoind instance using the same wallet")
                if descriptors:
                    expected_msg = f"Error: SQLiteDatabase: Unable to obtain an exclusive lock on the database, is it being used by another instance of {self.config['environment']['PACKAGE_NAME']}?"
                else:
                    expected_msg = "Error: Error initializing wallet database environment"
                self.nodes[1].assert_start_raises_init_error(extra_args=[f'-walletdir={wallet_dir}', f'-wallet={wallet_name}', '-noserver'], expected_msg=expected_msg, match=ErrorMatch.PARTIAL_REGEX)

            if self.is_bdb_compiled():
                check_wallet_filelock(False)
            if self.is_sqlite_compiled():
                check_wallet_filelock(True)

if __name__ == '__main__':
    FilelockTest().main()