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// Copyright (c) 2011-2019 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <util/settings.h>
#include <test/util/setup_common.h>
#include <test/util/str.h>
#include <boost/test/unit_test.hpp>
#include <univalue.h>
#include <util/strencodings.h>
#include <util/string.h>
#include <vector>
BOOST_FIXTURE_TEST_SUITE(settings_tests, BasicTestingSetup)
//! Check settings struct contents against expected json strings.
static void CheckValues(const util::Settings& settings, const std::string& single_val, const std::string& list_val)
{
util::SettingsValue single_value = GetSetting(settings, "section", "name", false, false);
util::SettingsValue list_value(util::SettingsValue::VARR);
for (const auto& item : GetSettingsList(settings, "section", "name", false)) {
list_value.push_back(item);
}
BOOST_CHECK_EQUAL(single_value.write().c_str(), single_val);
BOOST_CHECK_EQUAL(list_value.write().c_str(), list_val);
};
// Simple settings merge test case.
BOOST_AUTO_TEST_CASE(Simple)
{
util::Settings settings;
settings.command_line_options["name"].push_back("val1");
settings.command_line_options["name"].push_back("val2");
settings.ro_config["section"]["name"].push_back(2);
// The last given arg takes precedence when specified via commandline.
CheckValues(settings, R"("val2")", R"(["val1","val2",2])");
util::Settings settings2;
settings2.ro_config["section"]["name"].push_back("val2");
settings2.ro_config["section"]["name"].push_back("val3");
// The first given arg takes precedence when specified via config file.
CheckValues(settings2, R"("val2")", R"(["val2","val3"])");
}
// Confirm that a high priority setting overrides a lower priority setting even
// if the high priority setting is null. This behavior is useful for a high
// priority setting source to be able to effectively reset any setting back to
// its default value.
BOOST_AUTO_TEST_CASE(NullOverride)
{
util::Settings settings;
settings.command_line_options["name"].push_back("value");
BOOST_CHECK_EQUAL(R"("value")", GetSetting(settings, "section", "name", false, false).write().c_str());
settings.forced_settings["name"] = {};
BOOST_CHECK_EQUAL(R"(null)", GetSetting(settings, "section", "name", false, false).write().c_str());
}
// Test different ways settings can be merged, and verify results. This test can
// be used to confirm that updates to settings code don't change behavior
// unintentionally.
struct MergeTestingSetup : public BasicTestingSetup {
//! Max number of actions to sequence together. Can decrease this when
//! debugging to make test results easier to understand.
static constexpr int MAX_ACTIONS = 3;
enum Action { END, SET, NEGATE, SECTION_SET, SECTION_NEGATE };
using ActionList = Action[MAX_ACTIONS];
//! Enumerate all possible test configurations.
template <typename Fn>
void ForEachMergeSetup(Fn&& fn)
{
ActionList arg_actions = {};
// command_line_options do not have sections. Only iterate over SET and NEGATE
ForEachNoDup(arg_actions, SET, NEGATE, [&]{
ActionList conf_actions = {};
ForEachNoDup(conf_actions, SET, SECTION_NEGATE, [&]{
for (bool force_set : {false, true}) {
for (bool ignore_default_section_config : {false, true}) {
fn(arg_actions, conf_actions, force_set, ignore_default_section_config);
}
}
});
});
}
};
// Regression test covering different ways config settings can be merged. The
// test parses and merges settings, representing the results as strings that get
// compared against an expected hash. To debug, the result strings can be dumped
// to a file (see comments below).
BOOST_FIXTURE_TEST_CASE(Merge, MergeTestingSetup)
{
CHash256 out_sha;
FILE* out_file = nullptr;
if (const char* out_path = getenv("SETTINGS_MERGE_TEST_OUT")) {
out_file = fsbridge::fopen(out_path, "w");
if (!out_file) throw std::system_error(errno, std::generic_category(), "fopen failed");
}
const std::string& network = CBaseChainParams::MAIN;
ForEachMergeSetup([&](const ActionList& arg_actions, const ActionList& conf_actions, bool force_set,
bool ignore_default_section_config) {
std::string desc;
int value_suffix = 0;
util::Settings settings;
const std::string& name = ignore_default_section_config ? "wallet" : "server";
auto push_values = [&](Action action, const char* value_prefix, const std::string& name_prefix,
std::vector<util::SettingsValue>& dest) {
if (action == SET || action == SECTION_SET) {
for (int i = 0; i < 2; ++i) {
dest.push_back(value_prefix + ToString(++value_suffix));
desc += " " + name_prefix + name + "=" + dest.back().get_str();
}
} else if (action == NEGATE || action == SECTION_NEGATE) {
dest.push_back(false);
desc += " " + name_prefix + "no" + name;
}
};
if (force_set) {
settings.forced_settings[name] = "forced";
desc += " " + name + "=forced";
}
for (Action arg_action : arg_actions) {
push_values(arg_action, "a", "-", settings.command_line_options[name]);
}
for (Action conf_action : conf_actions) {
bool use_section = conf_action == SECTION_SET || conf_action == SECTION_NEGATE;
push_values(conf_action, "c", use_section ? network + "." : "",
settings.ro_config[use_section ? network : ""][name]);
}
desc += " || ";
desc += GetSetting(settings, network, name, ignore_default_section_config, /* get_chain_name= */ false).write();
desc += " |";
for (const auto& s : GetSettingsList(settings, network, name, ignore_default_section_config)) {
desc += " ";
desc += s.write();
}
desc += " |";
if (OnlyHasDefaultSectionSetting(settings, network, name)) desc += " ignored";
desc += "\n";
out_sha.Write((const unsigned char*)desc.data(), desc.size());
if (out_file) {
BOOST_REQUIRE(fwrite(desc.data(), 1, desc.size(), out_file) == desc.size());
}
});
if (out_file) {
if (fclose(out_file)) throw std::system_error(errno, std::generic_category(), "fclose failed");
out_file = nullptr;
}
unsigned char out_sha_bytes[CSHA256::OUTPUT_SIZE];
out_sha.Finalize(out_sha_bytes);
std::string out_sha_hex = HexStr(std::begin(out_sha_bytes), std::end(out_sha_bytes));
// If check below fails, should manually dump the results with:
//
// SETTINGS_MERGE_TEST_OUT=results.txt ./test_bitcoin --run_test=settings_tests/Merge
//
// And verify diff against previous results to make sure the changes are expected.
//
// Results file is formatted like:
//
// <input> || GetSetting() | GetSettingsList() | OnlyHasDefaultSectionSetting()
BOOST_CHECK_EQUAL(out_sha_hex, "79db02d74e3e193196541b67c068b40ebd0c124a24b3ecbe9cbf7e85b1c4ba7a");
}
BOOST_AUTO_TEST_SUITE_END()
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