VILLASnode/tests/unit/config.cpp

/** Unit tests for config features.
 *
 * @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
 * @copyright 2014-2020, Institute for Automation of Complex Power Systems, EONERC
 * @license GNU General Public License (version 3)
 *
 * VILLASnode
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *********************************************************************************/

#include <cstdio>
#include <cstdlib>
#include <filesystem>
#include <criterion/criterion.h>

#include <villas/utils.hpp>
#include <villas/config.hpp>

namespace fs = std::filesystem;
using namespace villas::node;

// cppcheck-suppress syntaxError
Test(config, env)
{
	const char *cfg_f = "test = \"${MY_ENV_VAR}\"\n";

	std::FILE *f = std::tmpfile();
	std::fputs(cfg_f, f);
	std::rewind(f);

	auto c = Config();

	char env[] = "MY_ENV_VAR=mobydick";
	putenv(env);

	auto *r = c.load(f);
	cr_assert_not_null(r);

	auto *j = json_object_get(r, "test");
	cr_assert_not_null(j);

	cr_assert(json_is_string(j));
	cr_assert_str_eq("mobydick", json_string_value(j));
}

Test(config, include)
{
	const char *cfg_f2 = "magic = 1234\n";

	std::string f2_fn = std::tmpnam(nullptr);
	std::FILE *f2 = std::fopen(f2_fn.c_str(), "w");
	std::fputs(cfg_f2, f2);
	std::rewind(f2);

	auto cfg_f1 = fmt::format("subval = \"@include {}\"\n", f2_fn);

	std::FILE *f1 = std::tmpfile();
	std::fputs(cfg_f1.c_str(), f1);
	std::rewind(f1);

	auto env = fmt::format("INCLUDE_FILE={}", f2_fn).c_str();
	putenv((char *) env);

	auto c = Config();

	auto *r = c.load(f1);
	cr_assert_not_null(r);

	auto *j = json_object_get(r, "subval");
	cr_assert_not_null(j);

	auto *j2 = json_object_get(j, "magic");
	cr_assert_not_null(j2);

	cr_assert(json_is_integer(j2));
	cr_assert_eq(json_number_value(j2), 1234);

	std::fclose(f2);
	std::remove(f2_fn.c_str());
}