litecoin/test/functional/feature_settings.py

#!/usr/bin/env python3
# Copyright (c) 2017-2020 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 various command line arguments and configuration file parameters."""

import json

from pathlib import Path

from test_framework.test_framework import BitcoinTestFramework
from test_framework.test_node import ErrorMatch
from test_framework.util import assert_equal


class SettingsTest(BitcoinTestFramework):
    def set_test_params(self):
        self.setup_clean_chain = True
        self.num_nodes = 1
        self.wallet_names = []

    def run_test(self):
        node, = self.nodes
        settings = Path(node.datadir, self.chain, "settings.json")
        conf = Path(node.datadir, "bitcoin.conf")

        # Assert empty settings file was created
        self.stop_node(0)
        with settings.open() as fp:
            assert_equal(json.load(fp), {})

        # Assert settings are parsed and logged
        with settings.open("w") as fp:
            json.dump({"string": "string", "num": 5, "bool": True, "null": None, "list": [6,7]}, fp)
        with node.assert_debug_log(expected_msgs=[
                'Setting file arg: string = "string"',
                'Setting file arg: num = 5',
                'Setting file arg: bool = true',
                'Setting file arg: null = null',
                'Setting file arg: list = [6,7]']):
            self.start_node(0)
            self.stop_node(0)

        # Assert settings are unchanged after shutdown
        with settings.open() as fp:
            assert_equal(json.load(fp), {"string": "string", "num": 5, "bool": True, "null": None, "list": [6,7]})

        # Test invalid json
        with settings.open("w") as fp:
            fp.write("invalid json")
        node.assert_start_raises_init_error(expected_msg='Unable to parse settings file', match=ErrorMatch.PARTIAL_REGEX)

        # Test invalid json object
        with settings.open("w") as fp:
            fp.write('"string"')
        node.assert_start_raises_init_error(expected_msg='Found non-object value "string" in settings file', match=ErrorMatch.PARTIAL_REGEX)

        # Test invalid settings file containing duplicate keys
        with settings.open("w") as fp:
            fp.write('{"key": 1, "key": 2}')
        node.assert_start_raises_init_error(expected_msg='Found duplicate key key in settings file', match=ErrorMatch.PARTIAL_REGEX)

        # Test invalid settings file is ignored with command line -nosettings
        with node.assert_debug_log(expected_msgs=['Command-line arg: settings=false']):
            self.start_node(0, extra_args=["-nosettings"])
            self.stop_node(0)

        # Test invalid settings file is ignored with config file -nosettings
        with conf.open('a') as conf:
            conf.write('nosettings=1\n')
        with node.assert_debug_log(expected_msgs=['Config file arg: [regtest] settings=false']):
            self.start_node(0)
            self.stop_node(0)

        # Test alternate settings path
        altsettings = Path(node.datadir, "altsettings.json")
        with altsettings.open("w") as fp:
            fp.write('{"key": "value"}')
        with node.assert_debug_log(expected_msgs=['Setting file arg: key = "value"']):
            self.start_node(0, extra_args=["-settings={}".format(altsettings)])
            self.stop_node(0)


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