Add MapSettingsManager and new mapgen setting script API functions

This commit refactors the majority of the Mapgen settings system.
- MapgenParams is now owned by MapSettingsManager, itself a part of ServerMap,
  instead of the EmergeManager.
- New Script API functions added:
    core.get_mapgen_setting
    core.get_mapgen_setting_noiseparams,
    core.set_mapgen_setting, and
    core.set_mapgen_setting_noiseparams.
- minetest.get/set_mapgen_params are deprecated by the above new functions.
- It is now possible to view and modify any arbitrary mapgen setting from a mod,
  rather than the base MapgenParams structure.
- MapgenSpecificParams has been removed.

2 files changed, 256 insertions, 0 deletions

diff --git a/src/unittest/CMakeLists.txt b/src/unittest/CMakeLists.txt
index a07ed8ba5..34de99e12 100644
--- a/src/unittest/CMakeLists.txt
+++ b/src/unittest/CMakeLists.txt
@@ -6,6 +6,7 @@ set (UNITTEST_SRCS
 	${CMAKE_CURRENT_SOURCE_DIR}/test_connection.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/test_filepath.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/test_inventory.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/test_map_settings_manager.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/test_mapnode.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/test_nodedef.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/test_noderesolver.cpp
diff --git a/src/unittest/test_map_settings_manager.cpp b/src/unittest/test_map_settings_manager.cpp
new file mode 100644
index 000000000..b2ad53192
--- /dev/null
+++ b/src/unittest/test_map_settings_manager.cpp
@@ -0,0 +1,255 @@
+ /*
+Minetest
+Copyright (C) 2010-2014 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
+(at your option) 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 Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "test.h"
+
+#include "noise.h"
+#include "settings.h"
+#include "mapgen_v5.h"
+#include "util/sha1.h"
+#include "map_settings_manager.h"
+
+class TestMapSettingsManager : public TestBase {
+public:
+	TestMapSettingsManager() { TestManager::registerTestModule(this); }
+	const char *getName() { return "TestMapSettingsManager"; }
+
+	void makeUserConfig(Settings *conf);
+	std::string makeMetaFile(bool make_corrupt);
+
+	void runTests(IGameDef *gamedef);
+
+	void testMapSettingsManager();
+	void testMapMetaSaveLoad();
+	void testMapMetaFailures();
+};
+
+static TestMapSettingsManager g_test_instance;
+
+void TestMapSettingsManager::runTests(IGameDef *gamedef)
+{
+	TEST(testMapSettingsManager);
+	TEST(testMapMetaSaveLoad);
+	TEST(testMapMetaFailures);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+
+void check_noise_params(const NoiseParams *np1, const NoiseParams *np2)
+{
+	UASSERTEQ(float, np1->offset, np2->offset);
+	UASSERTEQ(float, np1->scale, np2->scale);
+	UASSERT(np1->spread == np2->spread);
+	UASSERTEQ(s32, np1->seed, np2->seed);
+	UASSERTEQ(u16, np1->octaves, np2->octaves);
+	UASSERTEQ(float, np1->persist, np2->persist);
+	UASSERTEQ(float, np1->lacunarity, np2->lacunarity);
+	UASSERTEQ(u32, np1->flags, np2->flags);
+}
+
+
+std::string read_file_to_string(const std::string &filepath)
+{
+	std::string buf;
+	FILE *f = fopen(filepath.c_str(), "rb");
+	if (!f)
+		return "";
+
+	fseek(f, 0, SEEK_END);
+
+	long filesize = ftell(f);
+	if (filesize == -1)
+		return "";
+	rewind(f);
+
+	buf.resize(filesize);
+
+	fread(&buf[0], 1, filesize, f);
+
+	fclose(f);
+	return buf;
+}
+
+
+void TestMapSettingsManager::makeUserConfig(Settings *conf)
+{
+	conf->set("mg_name", "v7");
+	conf->set("seed", "5678");
+	conf->set("water_level", "20");
+	conf->set("mgv5_np_factor", "0, 12,  (500, 250, 500), 920382, 5, 0.45, 3.0");
+	conf->set("mgv5_np_height", "0, 15, (500, 250, 500), 841746,  5, 0.5,  3.0");
+	conf->set("mgv5_np_filler_depth", "20, 1, (150, 150, 150), 261, 4, 0.7,  1.0");
+	conf->set("mgv5_np_ground", "-43, 40, (80,  80,  80),  983240, 4, 0.55, 2.0");
+}
+
+
+std::string TestMapSettingsManager::makeMetaFile(bool make_corrupt)
+{
+	std::string metafile = getTestTempFile();
+
+	const char *metafile_contents =
+		"mg_name = v5\n"
+		"seed = 1234\n"
+		"mg_flags = light\n"
+		"mgv5_np_filler_depth = 20, 1, (150, 150, 150), 261, 4, 0.7,  1.0\n"
+		"mgv5_np_height = 20, 10, (250, 250, 250), 84174,  4, 0.5,  1.0\n";
+
+	FILE *f = fopen(metafile.c_str(), "wb");
+	UASSERT(f != NULL);
+
+	fputs(metafile_contents, f);
+	if (!make_corrupt)
+		fputs("[end_of_params]\n", f);
+
+	fclose(f);
+
+	return metafile;
+}
+
+
+void TestMapSettingsManager::testMapSettingsManager()
+{
+	Settings user_settings;
+	makeUserConfig(&user_settings);
+
+	std::string test_mapmeta_path = makeMetaFile(false);
+
+	MapSettingsManager mgr(&user_settings, test_mapmeta_path);
+	std::string value;
+
+	UASSERT(mgr.getMapSetting("mg_name", &value));
+	UASSERT(value == "v7");
+
+	// Pretend we're initializing the ServerMap
+	UASSERT(mgr.loadMapMeta());
+
+	// Pretend some scripts are requesting mapgen params
+	UASSERT(mgr.getMapSetting("mg_name", &value));
+	UASSERT(value == "v5");
+	UASSERT(mgr.getMapSetting("seed", &value));
+	UASSERT(value == "1234");
+	UASSERT(mgr.getMapSetting("water_level", &value));
+	UASSERT(value == "20");
+
+    // Pretend we have some mapgen settings configured from the scripting
+	UASSERT(mgr.setMapSetting("water_level", "15"));
+	UASSERT(mgr.setMapSetting("seed", "02468"));
+	UASSERT(mgr.setMapSetting("mg_flags", "nolight", true));
+
+	NoiseParams script_np_filler_depth(0, 100, v3f(200, 100, 200), 261, 4, 0.7, 2.0);
+	NoiseParams script_np_factor(0, 100, v3f(50, 50, 50), 920381, 3, 0.45, 2.0);
+	NoiseParams script_np_height(0, 100, v3f(450, 450, 450), 84174, 4, 0.5, 2.0);
+	NoiseParams meta_np_height(20, 10, v3f(250, 250, 250), 84174,  4, 0.5,  1.0);
+	NoiseParams user_np_ground(-43, 40, v3f(80,  80,  80),  983240, 4, 0.55, 2.0, NOISE_FLAG_EASED);
+
+	mgr.setMapSettingNoiseParams("mgv5_np_filler_depth", &script_np_filler_depth, true);
+	mgr.setMapSettingNoiseParams("mgv5_np_height", &script_np_height);
+	mgr.setMapSettingNoiseParams("mgv5_np_factor", &script_np_factor);
+
+	// Now make our Params and see if the values are correctly sourced
+	MapgenParams *params = mgr.makeMapgenParams();
+	UASSERT(params->mgtype == MAPGEN_V5);
+	UASSERT(params->chunksize == 5);
+	UASSERT(params->water_level == 15);
+	UASSERT(params->seed == 1234);
+	UASSERT((params->flags & MG_LIGHT) == 0);
+
+	MapgenV5Params *v5params = (MapgenV5Params *)params;
+
+	check_noise_params(&v5params->np_filler_depth, &script_np_filler_depth);
+	check_noise_params(&v5params->np_factor, &script_np_factor);
+	check_noise_params(&v5params->np_height, &meta_np_height);
+	check_noise_params(&v5params->np_ground, &user_np_ground);
+
+	UASSERT(mgr.setMapSetting("foobar", "25") == false);
+
+	// Pretend the ServerMap is shutting down
+	UASSERT(mgr.saveMapMeta());
+
+	// Make sure our interface expectations are met
+	UASSERT(mgr.mapgen_params == params);
+	UASSERT(mgr.makeMapgenParams() == params);
+
+	// Load the resulting map_meta.txt and make sure it contains what we expect
+	unsigned char expected_contents_hash[20] = {
+		0xf6, 0x44, 0x90, 0xb7, 0xab, 0xd8, 0x91, 0xf4, 0x08, 0x96,
+		0xfc, 0x7e, 0xed, 0x01, 0xc5, 0x9a, 0xfd, 0x2f, 0x2d, 0x79
+	};
+
+	SHA1 ctx;
+	std::string metafile_contents = read_file_to_string(test_mapmeta_path);
+	ctx.addBytes(&metafile_contents[0], metafile_contents.size());
+	unsigned char *sha1_result = ctx.getDigest();
+	int resultdiff = memcmp(sha1_result, expected_contents_hash, 20);
+	free(sha1_result);
+
+	UASSERT(!resultdiff);
+}
+
+
+void TestMapSettingsManager::testMapMetaSaveLoad()
+{
+	Settings conf;
+	std::string path = getTestTempDirectory()
+		+ DIR_DELIM + "foobar" + DIR_DELIM + "map_meta.txt";
+
+	// Create a set of mapgen params and save them to map meta
+	conf.set("seed", "12345");
+	conf.set("water_level", "5");
+	MapSettingsManager mgr1(&conf, path);
+	MapgenParams *params1 = mgr1.makeMapgenParams();
+	UASSERT(params1);
+	UASSERT(mgr1.saveMapMeta());
+
+	// Now try loading the map meta to mapgen params
+	conf.set("seed", "67890");
+	conf.set("water_level", "32");
+	MapSettingsManager mgr2(&conf, path);
+	UASSERT(mgr2.loadMapMeta());
+	MapgenParams *params2 = mgr2.makeMapgenParams();
+	UASSERT(params2);
+
+	// Check that both results are correct
+	UASSERTEQ(u64, params1->seed, 12345);
+	UASSERTEQ(s16, params1->water_level, 5);
+	UASSERTEQ(u64, params2->seed, 12345);
+	UASSERTEQ(s16, params2->water_level, 5);
+}
+
+
+void TestMapSettingsManager::testMapMetaFailures()
+{
+	std::string test_mapmeta_path;
+	Settings conf;
+
+	// Check to see if it'll fail on a non-existent map meta file
+	test_mapmeta_path = "woobawooba/fgdfg/map_meta.txt";
+	UASSERT(!fs::PathExists(test_mapmeta_path));
+
+	MapSettingsManager mgr1(&conf, test_mapmeta_path);
+	UASSERT(!mgr1.loadMapMeta());
+
+	// Check to see if it'll fail on a corrupt map meta file
+	test_mapmeta_path = makeMetaFile(true);
+	UASSERT(fs::PathExists(test_mapmeta_path));
+
+	MapSettingsManager mgr2(&conf, test_mapmeta_path);
+	UASSERT(!mgr2.loadMapMeta());
+}