Add ModStorageAPI to client side modding (#5396)

mod storage is located into user_path / client / mod_storage

clientmods/preview/init.lua

@@ -1,4 +1,5 @@
 local modname = core.get_current_modname() or "??"
+local modstorage = core.get_mod_storage()
 
 -- This is an example function to ensure it's working properly, should be removed before merge
 core.register_on_shutdown(function()
@@ -49,6 +50,8 @@ core.register_chatcommand("test_node", {
 
 core.after(2, function()
 	print("[PREVIEW] loaded " .. modname .. " mod")
+	modstorage:set_string("current_mod", modname)
+	print(modstorage:get_string("current_mod"))
 end)
 
 core.register_on_dignode(function(pos, node)

src/client.cpp

@@ -249,7 +249,8 @@ Client::Client(
 	m_removed_sounds_check_timer(0),
 	m_state(LC_Created),
 	m_localdb(NULL),
-	m_script(NULL)
+	m_script(NULL),
+	m_mod_storage_save_timer(10.0f)
 {
 	// Add local player
 	m_env.setLocalPlayer(new LocalPlayer(this, playername));
@@ -730,6 +731,18 @@ void Client::step(float dtime)
 		}
 	}
 
+	m_mod_storage_save_timer -= dtime;
+	if (m_mod_storage_save_timer <= 0.0f) {
+		verbosestream << "Saving registered mod storages." << std::endl;
+		m_mod_storage_save_timer = g_settings->getFloat("server_map_save_interval");
+		for (UNORDERED_MAP<std::string, ModMetadata *>::const_iterator
+				it = m_mod_storages.begin(); it != m_mod_storages.end(); ++it) {
+			if (it->second->isModified()) {
+				it->second->save(getModStoragePath());
+			}
+		}
+	}
+
 	// Write server map
 	if (m_localdb && m_localdb_save_interval.step(dtime,
 			m_cache_save_interval)) {
@@ -1998,3 +2011,31 @@ scene::IAnimatedMesh* Client::getMesh(const std::string &filename)
 	smgr->getMeshCache()->removeMesh(mesh);
 	return mesh;
 }
+
+bool Client::registerModStorage(ModMetadata *storage)
+{
+	if (m_mod_storages.find(storage->getModName()) != m_mod_storages.end()) {
+		errorstream << "Unable to register same mod storage twice. Storage name: "
+				<< storage->getModName() << std::endl;
+		return false;
+	}
+
+	m_mod_storages[storage->getModName()] = storage;
+	return true;
+}
+
+void Client::unregisterModStorage(const std::string &name)
+{
+	UNORDERED_MAP<std::string, ModMetadata *>::const_iterator it = m_mod_storages.find(name);
+	if (it != m_mod_storages.end()) {
+		// Save unconditionaly on unregistration
+		it->second->save(getModStoragePath());
+		m_mod_storages.erase(name);
+	}
+}
+
+std::string Client::getModStoragePath() const
+{
+	return porting::path_user + DIR_DELIM + "client" + DIR_DELIM + "mod_storage";
+}
+

src/client.h

@@ -554,6 +554,10 @@ class Client : public con::PeerHandler, public InventoryManager, public IGameDef
 	{ return checkPrivilege(priv); }
 	virtual scene::IAnimatedMesh* getMesh(const std::string &filename);
 
+	virtual std::string getModStoragePath() const;
+	virtual bool registerModStorage(ModMetadata *meta);
+	virtual void unregisterModStorage(const std::string &name);
+
 	// The following set of functions is used by ClientMediaDownloader
 	// Insert a media file appropriately into the appropriate manager
 	bool loadMedia(const std::string &data, const std::string &filename);
@@ -724,6 +728,8 @@ class Client : public con::PeerHandler, public InventoryManager, public IGameDef
 
 	ClientScripting *m_script;
 	bool m_modding_enabled;
+	UNORDERED_MAP<std::string, ModMetadata *> m_mod_storages;
+	float m_mod_storage_save_timer;
 
 	DISABLE_CLASS_COPY(Client);
 };

src/gamedef.h

@@ -34,6 +34,7 @@ class MtEventManager;
 class IRollbackManager;
 class EmergeManager;
 class Camera;
+class ModMetadata;
 
 namespace irr { namespace scene {
 	class IAnimatedMesh;
@@ -75,6 +76,9 @@ class IGameDef
 	virtual const std::vector<ModSpec> &getMods() const = 0;
 	virtual const ModSpec* getModSpec(const std::string &modname) const = 0;
 	virtual std::string getWorldPath() const { return ""; }
+	virtual std::string getModStoragePath() const = 0;
+	virtual bool registerModStorage(ModMetadata *storage) = 0;
+	virtual void unregisterModStorage(const std::string &name) = 0;
 };
 
 #endif

src/script/clientscripting.cpp

@@ -58,4 +58,5 @@ void ClientScripting::InitializeModApi(lua_State *L, int top)
 	ModApiStorage::Initialize(L, top);
 
 	LuaItemStack::Register(L);
+	StorageRef::Register(L);
 }

src/script/lua_api/l_storage.cpp

@@ -33,10 +33,9 @@ int ModApiStorage::l_get_mod_storage(lua_State *L)
 	std::string mod_name = lua_tostring(L, -1);
 
 	ModMetadata *store = new ModMetadata(mod_name);
-	// For server side
-	if (Server *server = getServer(L)) {
-		store->load(server->getModStoragePath());
-		server->registerModStorage(store);
+	if (IGameDef *gamedef = getGameDef(L)) {
+		store->load(gamedef->getModStoragePath());
+		gamedef->registerModStorage(store);
 	} else {
 		assert(false); // this should not happen
 	}
@@ -70,8 +69,8 @@ int StorageRef::gc_object(lua_State *L)
 {
 	StorageRef *o = *(StorageRef **)(lua_touserdata(L, 1));
 	// Server side
-	if (Server *server = getServer(L))
-		server->unregisterModStorage(getobject(o)->getModName());
+	if (IGameDef *gamedef = getGameDef(L))
+		gamedef->unregisterModStorage(getobject(o)->getModName());
 	delete o;
 	return 0;
 }

src/server.h

@@ -299,8 +299,8 @@ class Server : public con::PeerHandler, public MapEventReceiver,
 	virtual const ModSpec* getModSpec(const std::string &modname) const;
 	void getModNames(std::vector<std::string> &modlist);
 	std::string getBuiltinLuaPath();
-	std::string getWorldPath() const { return m_path_world; }
-	std::string getModStoragePath() const;
+	virtual std::string getWorldPath() const { return m_path_world; }
+	virtual std::string getModStoragePath() const;
 
 	inline bool isSingleplayer()
 			{ return m_simple_singleplayer_mode; }
@@ -361,8 +361,8 @@ class Server : public con::PeerHandler, public MapEventReceiver,
 	void SendInventory(PlayerSAO* playerSAO);
 	void SendMovePlayer(u16 peer_id);
 
-	bool registerModStorage(ModMetadata *storage);
-	void unregisterModStorage(const std::string &name);
+	virtual bool registerModStorage(ModMetadata *storage);
+	virtual void unregisterModStorage(const std::string &name);
 
 	// Bind address
 	Address m_bind_addr;

src/unittest/test.cpp

@@ -65,6 +65,9 @@ class TestGameDef : public IGameDef {
 		return testmodspec;
 	}
 	virtual const ModSpec* getModSpec(const std::string &modname) const { return NULL; }
+	virtual std::string getModStoragePath() const { return "."; }
+	virtual bool registerModStorage(ModMetadata *meta) { return true; }
+	virtual void unregisterModStorage(const std::string &name) {}
 
 private:
 	IItemDefManager *m_itemdef;