From 2ac20982e0772b94b21d95b53519bd2164632d98 Mon Sep 17 00:00:00 2001
From: Perttu Ahola <celeron55@gmail.com>
Date: Tue, 24 Jul 2012 20:57:17 +0300
Subject: [PATCH] Detached inventories

---
 doc/lua_api.txt                          |   6 +
 games/minimal/mods/experimental/init.lua |   7 ++
 src/client.cpp                           |  34 ++++++
 src/client.h                             |   4 +
 src/clientserver.h                       |   9 ++
 src/guiFormSpecMenu.cpp                  |  17 ++-
 src/guiFormSpecMenu.h                    |   6 +-
 src/inventorymanager.cpp                 |  40 +++----
 src/inventorymanager.h                   |  16 ++-
 src/scriptapi.cpp                        |  18 +++
 src/server.cpp                           | 137 ++++++++++++++---------
 src/server.h                             |  13 +++
 12 files changed, 222 insertions(+), 85 deletions(-)

diff --git a/doc/lua_api.txt b/doc/lua_api.txt
index 176745a2d..c9fafd65f 100644
--- a/doc/lua_api.txt
+++ b/doc/lua_api.txt
@@ -677,6 +677,7 @@ size[<W>,<H>]
 ^ deprecated: invsize[<W>,<H>;]
 
 list[<inventory location>;<list name>;<X>,<Y>;<W>,<H>;]
+list[<inventory location>;<list name>;<X>,<Y>;<W>,<H>;<starting item index>]
 ^ Show an inventory list
 
 image[<X>,<Y>;<W>,<H>;<texture name>]
@@ -726,10 +727,12 @@ image_button_exit[<X>,<Y>;<W>,<H>;<texture name>;<name>;<label>]
 ^ When clicked, fields will be sent and the form will quit.
 
 Inventory location:
+
 - "context": Selected node metadata (deprecated: "current_name")
 - "current_player": Player to whom the menu is shown
 - "player:<name>": Any player
 - "nodemeta:<X>,<Y>,<Z>": Any node metadata
+- "detached:<name>": A detached inventory
 
 Helper functions
 -----------------
@@ -847,6 +850,9 @@ Inventory:
 minetest.get_inventory(location) -> InvRef
 ^ location = eg. {type="player", name="celeron55"}
                  {type="node", pos={x=, y=, z=}}
+                 {type="detached", name="creative"}
+minetest.create_detached_inventory(name) -> InvRef
+^ Creates a detached inventory. If it already exists, it is cleared.
 
 Item handling:
 minetest.inventorycube(img1, img2, img3)
diff --git a/games/minimal/mods/experimental/init.lua b/games/minimal/mods/experimental/init.lua
index 3f50263e0..498c64623 100644
--- a/games/minimal/mods/experimental/init.lua
+++ b/games/minimal/mods/experimental/init.lua
@@ -524,6 +524,12 @@ minetest.register_craft({
 	end)
 end)]]
 
+-- Create a detached inventory
+local inv = minetest.create_detached_inventory("test_inventory")
+inv:set_size("main", 4*6)
+inv:add_item("main", "experimental:tester_tool_1")
+inv:add_item("main", "experimental:tnt 5")
+
 minetest.register_chatcommand("test1", {
 	params = "",
 	description = "Test 1: Modify player's inventory view",
@@ -538,6 +544,7 @@ minetest.register_chatcommand("test1", {
 				"list[current_player;main;5,3.5;8,4;]"..
 				"list[current_player;craft;8,0;3,3;]"..
 				"list[current_player;craftpreview;12,1;1,1;]"..
+				"list[detached:test_inventory;main;0,0;4,6;0]"..
 				"button[0.5,7;2,1;button1;Button 1]"..
 				"button_exit[2.5,7;2,1;button2;Exit Button]"
 		)
diff --git a/src/client.cpp b/src/client.cpp
index 3a2edede3..e47bce142 100644
--- a/src/client.cpp
+++ b/src/client.cpp
@@ -304,6 +304,15 @@ Client::~Client()
 		sleep_ms(100);
 
 	delete m_inventory_from_server;
+
+	// Delete detached inventories
+	{
+		for(std::map<std::string, Inventory*>::iterator
+				i = m_detached_inventories.begin();
+				i != m_detached_inventories.end(); i++){
+			delete i->second;
+		}
+	}
 }
 
 void Client::connect(Address address)
@@ -1698,6 +1707,24 @@ void Client::ProcessData(u8 *data, u32 datasize, u16 sender_peer_id)
 		assert(player != NULL);
 		player->inventory_formspec = deSerializeLongString(is);
 	}
+	else if(command == TOCLIENT_DETACHED_INVENTORY)
+	{
+		std::string datastring((char*)&data[2], datasize-2);
+		std::istringstream is(datastring, std::ios_base::binary);
+
+		std::string name = deSerializeString(is);
+		
+		infostream<<"Client: Detached inventory update: \""<<name<<"\""<<std::endl;
+
+		Inventory *inv = NULL;
+		if(m_detached_inventories.count(name) > 0)
+			inv = m_detached_inventories[name];
+		else{
+			inv = new Inventory(m_itemdef);
+			m_detached_inventories[name] = inv;
+		}
+		inv->deSerialize(is);
+	}
 	else
 	{
 		infostream<<"Client: Ignoring unknown command "
@@ -2090,6 +2117,13 @@ Inventory* Client::getInventory(const InventoryLocation &loc)
 		return meta->getInventory();
 	}
 	break;
+	case InventoryLocation::DETACHED:
+	{
+		if(m_detached_inventories.count(loc.name) == 0)
+			return NULL;
+		return m_detached_inventories[loc.name];
+	}
+	break;
 	default:
 		assert(0);
 	}
diff --git a/src/client.h b/src/client.h
index f751220f7..154c8bb00 100644
--- a/src/client.h
+++ b/src/client.h
@@ -393,6 +393,10 @@ private:
 
 	// Privileges
 	std::set<std::string> m_privileges;
+
+	// Detached inventories
+	// key = name
+	std::map<std::string, Inventory*> m_detached_inventories;
 };
 
 #endif // !CLIENT_HEADER
diff --git a/src/clientserver.h b/src/clientserver.h
index d43220962..a6ba8fe45 100644
--- a/src/clientserver.h
+++ b/src/clientserver.h
@@ -64,6 +64,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 	PROTOCOL_VERSION 12:
 		TOSERVER_INVENTORY_FIELDS
 		16-bit node ids
+		TOCLIENT_DETACHED_INVENTORY
 */
 
 #define PROTOCOL_VERSION 12
@@ -321,6 +322,14 @@ enum ToClientCommand
 		u32 len
 		u8[len] formspec
 	*/
+
+	TOCLIENT_DETACHED_INVENTORY = 0x43,
+	/*
+		[0] u16 command
+		u16 len
+		u8[len] name
+		[2] serialized inventory
+	*/
 };
 
 enum ToServerCommand
diff --git a/src/guiFormSpecMenu.cpp b/src/guiFormSpecMenu.cpp
index b2fee9c0d..3eb056625 100644
--- a/src/guiFormSpecMenu.cpp
+++ b/src/guiFormSpecMenu.cpp
@@ -257,10 +257,13 @@ void GUIFormSpecMenu::regenerateGui(v2u32 screensize)
 					<<", pos=("<<pos.X<<","<<pos.Y<<")"
 					<<", geom=("<<geom.X<<","<<geom.Y<<")"
 					<<std::endl;
-			f.next("]");
+			std::string start_i_s = f.next("]");
+			s32 start_i = 0;
+			if(start_i_s != "")
+				start_i = stoi(start_i_s);
 			if(bp_set != 2)
-				errorstream<<"WARNING: invalid use of button without a size[] element"<<std::endl;
-			m_inventorylists.push_back(ListDrawSpec(loc, listname, pos, geom));
+				errorstream<<"WARNING: invalid use of list without a size[] element"<<std::endl;
+			m_inventorylists.push_back(ListDrawSpec(loc, listname, pos, geom, start_i));
 		}
 		else if(type == "image")
 		{
@@ -531,13 +534,14 @@ GUIFormSpecMenu::ItemSpec GUIFormSpecMenu::getItemAtPos(v2s32 p) const
 
 		for(s32 i=0; i<s.geom.X*s.geom.Y; i++)
 		{
+			s32 item_i = i + s.start_item_i;
 			s32 x = (i%s.geom.X) * spacing.X;
 			s32 y = (i/s.geom.X) * spacing.Y;
 			v2s32 p0(x,y);
 			core::rect<s32> rect = imgrect + s.pos + p0;
 			if(rect.isPointInside(p))
 			{
-				return ItemSpec(s.inventoryloc, s.listname, i);
+				return ItemSpec(s.inventoryloc, s.listname, item_i);
 			}
 		}
 	}
@@ -576,13 +580,16 @@ void GUIFormSpecMenu::drawList(const ListDrawSpec &s, int phase)
 	
 	for(s32 i=0; i<s.geom.X*s.geom.Y; i++)
 	{
+		u32 item_i = i + s.start_item_i;
+		if(item_i >= ilist->getSize())
+			break;
 		s32 x = (i%s.geom.X) * spacing.X;
 		s32 y = (i/s.geom.X) * spacing.Y;
 		v2s32 p(x,y);
 		core::rect<s32> rect = imgrect + s.pos + p;
 		ItemStack item;
 		if(ilist)
-			item = ilist->getItem(i);
+			item = ilist->getItem(item_i);
 
 		bool selected = m_selected_item
 			&& m_invmgr->getInventory(m_selected_item->inventoryloc) == inv
diff --git a/src/guiFormSpecMenu.h b/src/guiFormSpecMenu.h
index 8e9557566..f0a5988e9 100644
--- a/src/guiFormSpecMenu.h
+++ b/src/guiFormSpecMenu.h
@@ -86,11 +86,12 @@ class GUIFormSpecMenu : public GUIModalMenu
 		}
 		ListDrawSpec(const InventoryLocation &a_inventoryloc,
 				const std::string &a_listname,
-				v2s32 a_pos, v2s32 a_geom):
+				v2s32 a_pos, v2s32 a_geom, s32 a_start_item_i):
 			inventoryloc(a_inventoryloc),
 			listname(a_listname),
 			pos(a_pos),
-			geom(a_geom)
+			geom(a_geom),
+			start_item_i(a_start_item_i)
 		{
 		}
 
@@ -98,6 +99,7 @@ class GUIFormSpecMenu : public GUIModalMenu
 		std::string listname;
 		v2s32 pos;
 		v2s32 geom;
+		s32 start_item_i;
 	};
 
 	struct ImageDrawSpec
diff --git a/src/inventorymanager.cpp b/src/inventorymanager.cpp
index 25257238b..1369cb0d7 100644
--- a/src/inventorymanager.cpp
+++ b/src/inventorymanager.cpp
@@ -41,30 +41,25 @@ std::string InventoryLocation::dump() const
 
 void InventoryLocation::serialize(std::ostream &os) const
 {
-        switch(type){
-        case InventoryLocation::UNDEFINED:
-        {
-		os<<"undefined";
-	}
+    switch(type){
+    case InventoryLocation::UNDEFINED:
+        os<<"undefined";
         break;
-        case InventoryLocation::CURRENT_PLAYER:
-        {
-		os<<"current_player";
-        }
+    case InventoryLocation::CURRENT_PLAYER:
+        os<<"current_player";
         break;
-        case InventoryLocation::PLAYER:
-        {
-		os<<"player:"<<name;
-        }
+    case InventoryLocation::PLAYER:
+        os<<"player:"<<name;
         break;
-        case InventoryLocation::NODEMETA:
-        {
-		os<<"nodemeta:"<<p.X<<","<<p.Y<<","<<p.Z;
-        }
+    case InventoryLocation::NODEMETA:
+        os<<"nodemeta:"<<p.X<<","<<p.Y<<","<<p.Z;
         break;
-        default:
-                assert(0);
-        }
+    case InventoryLocation::DETACHED:
+        os<<"detached:"<<name;
+        break;
+    default:
+        assert(0);
+    }
 }
 
 void InventoryLocation::deSerialize(std::istream &is)
@@ -94,6 +89,11 @@ void InventoryLocation::deSerialize(std::istream &is)
 		p.Y = stoi(fn.next(","));
 		p.Z = stoi(fn.next(","));
 	}
+	else if(tname == "detached")
+	{
+		type = InventoryLocation::DETACHED;
+		std::getline(is, name, '\n');
+	}
 	else
 	{
 		infostream<<"Unknown InventoryLocation type=\""<<tname<<"\""<<std::endl;
diff --git a/src/inventorymanager.h b/src/inventorymanager.h
index 009db4836..dae14f1a6 100644
--- a/src/inventorymanager.h
+++ b/src/inventorymanager.h
@@ -32,9 +32,10 @@ struct InventoryLocation
 		CURRENT_PLAYER,
 		PLAYER,
 		NODEMETA,
+        DETACHED,
 	} type;
 
-	std::string name; // PLAYER
+	std::string name; // PLAYER, DETACHED
 	v3s16 p; // NODEMETA
 
 	InventoryLocation()
@@ -59,6 +60,11 @@ struct InventoryLocation
 		type = NODEMETA;
 		p = p_;
 	}
+	void setDetached(const std::string &name_)
+	{
+		type = DETACHED;
+		name = name_;
+	}
 
 	void applyCurrentPlayer(const std::string &name_)
 	{
@@ -80,13 +86,11 @@ public:
 	InventoryManager(){}
 	virtual ~InventoryManager(){}
 	
-	// Get an inventory or set it modified (so it will be updated over
-	// network or so)
+	// Get an inventory (server and client)
 	virtual Inventory* getInventory(const InventoryLocation &loc){return NULL;}
-	virtual std::string getInventoryOwner(const InventoryLocation &loc){return "";}
+    // Set modified (will be saved and sent over network; only on server)
 	virtual void setInventoryModified(const InventoryLocation &loc){}
-
-	// Used on the client to send an action to the server
+    // Send inventory action to server (only on client)
 	virtual void inventoryAction(InventoryAction *a){}
 };
 
diff --git a/src/scriptapi.cpp b/src/scriptapi.cpp
index 12d2a8247..9959ddd74 100644
--- a/src/scriptapi.cpp
+++ b/src/scriptapi.cpp
@@ -4567,6 +4567,9 @@ static int l_get_inventory(lua_State *L)
 		lua_getfield(L, 1, "pos");
 		v3s16 pos = check_v3s16(L, -1);
 		loc.setNodeMeta(pos);
+	} else if(type == "detached"){
+		std::string name = checkstringfield(L, 1, "name");
+		loc.setDetached(name);
 	}
 	
 	if(get_server(L)->getInventory(loc) != NULL)
@@ -4576,6 +4579,20 @@ static int l_get_inventory(lua_State *L)
 	return 1;
 }
 
+// create_detached_inventory(name)
+static int l_create_detached_inventory(lua_State *L)
+{
+	const char *name = luaL_checkstring(L, 1);
+	if(get_server(L)->createDetachedInventory(name) != NULL){
+		InventoryLocation loc;
+		loc.setDetached(name);
+		InvRef::create(L, loc);
+	}else{
+		lua_pushnil(L);
+	}
+	return 1;
+}
+
 // get_dig_params(groups, tool_capabilities[, time_from_last_punch])
 static int l_get_dig_params(lua_State *L)
 {
@@ -4849,6 +4866,7 @@ static const struct luaL_Reg minetest_f [] = {
 	{"chat_send_player", l_chat_send_player},
 	{"get_player_privs", l_get_player_privs},
 	{"get_inventory", l_get_inventory},
+	{"create_detached_inventory", l_create_detached_inventory},
 	{"get_dig_params", l_get_dig_params},
 	{"get_hit_params", l_get_hit_params},
 	{"get_current_modname", l_get_current_modname},
diff --git a/src/server.cpp b/src/server.cpp
index b3cbea6a4..c7698a106 100644
--- a/src/server.cpp
+++ b/src/server.cpp
@@ -1160,6 +1160,15 @@ Server::~Server()
 	// Deinitialize scripting
 	infostream<<"Server: Deinitializing scripting"<<std::endl;
 	script_deinit(m_lua);
+
+	// Delete detached inventories
+	{
+		for(std::map<std::string, Inventory*>::iterator
+				i = m_detached_inventories.begin();
+				i != m_detached_inventories.end(); i++){
+			delete i->second;
+		}
+	}
 }
 
 void Server::start(unsigned short port)
@@ -2250,10 +2259,13 @@ void Server::ProcessData(u8 *data, u32 datasize, u16 peer_id)
 		// Send inventory
 		UpdateCrafting(peer_id);
 		SendInventory(peer_id);
-		
+
 		// Send HP
 		SendPlayerHP(peer_id);
 		
+		// Send detached inventories
+		sendDetachedInventories(peer_id);
+		
 		// Show death screen if necessary
 		if(player->hp == 0)
 			SendDeathscreen(m_con, peer_id, false, v3f(0,0,0));
@@ -2532,30 +2544,6 @@ void Server::ProcessData(u8 *data, u32 datasize, u16 peer_id)
 				delete a;
 				return;
 			}
-
-			// If player is not an admin, check for ownership of src and dst
-			/*if(!checkPriv(player->getName(), "server"))
-			{
-				std::string owner_from = getInventoryOwner(ma->from_inv);
-				if(owner_from != "" && owner_from != player->getName())
-				{
-					infostream<<"WARNING: "<<player->getName()
-						<<" tried to access an inventory that"
-						<<" belongs to "<<owner_from<<std::endl;
-					delete a;
-					return;
-				}
-
-				std::string owner_to = getInventoryOwner(ma->to_inv);
-				if(owner_to != "" && owner_to != player->getName())
-				{
-					infostream<<"WARNING: "<<player->getName()
-						<<" tried to access an inventory that"
-						<<" belongs to "<<owner_to<<std::endl;
-					delete a;
-					return;
-				}
-			}*/
 		}
 		/*
 			Handle restrictions and special cases of the drop action
@@ -2574,19 +2562,6 @@ void Server::ProcessData(u8 *data, u32 datasize, u16 peer_id)
 				delete a;
 				return;
 			}
-			// If player is not an admin, check for ownership
-			/*else if(!checkPriv(player->getName(), "server"))
-			{
-				std::string owner_from = getInventoryOwner(da->from_inv);
-				if(owner_from != "" && owner_from != player->getName())
-				{
-					infostream<<"WARNING: "<<player->getName()
-						<<" tried to access an inventory that"
-						<<" belongs to "<<owner_from<<std::endl;
-					delete a;
-					return;
-				}
-			}*/
 		}
 		/*
 			Handle restrictions and special cases of the craft action
@@ -2611,20 +2586,6 @@ void Server::ProcessData(u8 *data, u32 datasize, u16 peer_id)
 				delete a;
 				return;
 			}
-
-			// If player is not an admin, check for ownership of inventory
-			/*if(!checkPriv(player->getName(), "server"))
-			{
-				std::string owner_craft = getInventoryOwner(ca->craft_inv);
-				if(owner_craft != "" && owner_craft != player->getName())
-				{
-					infostream<<"WARNING: "<<player->getName()
-						<<" tried to access an inventory that"
-						<<" belongs to "<<owner_craft<<std::endl;
-					delete a;
-					return;
-				}
-			}*/
 		}
 		
 		// Do the action
@@ -3318,6 +3279,13 @@ Inventory* Server::getInventory(const InventoryLocation &loc)
 		return meta->getInventory();
 	}
 	break;
+	case InventoryLocation::DETACHED:
+	{
+		if(m_detached_inventories.count(loc.name) == 0)
+			return NULL;
+		return m_detached_inventories[loc.name];
+	}
+	break;
 	default:
 		assert(0);
 	}
@@ -3352,6 +3320,11 @@ void Server::setInventoryModified(const InventoryLocation &loc)
 		setBlockNotSent(blockpos);
 	}
 	break;
+	case InventoryLocation::DETACHED:
+	{
+		sendDetachedInventoryToAll(loc.name);
+	}
+	break;
 	default:
 		assert(0);
 	}
@@ -4309,6 +4282,51 @@ void Server::sendRequestedMedia(u16 peer_id,
 	}
 }
 
+void Server::sendDetachedInventory(const std::string &name, u16 peer_id)
+{
+	if(m_detached_inventories.count(name) == 0){
+		errorstream<<__FUNCTION_NAME<<": \""<<name<<"\" not found"<<std::endl;
+		return;
+	}
+	Inventory *inv = m_detached_inventories[name];
+
+	std::ostringstream os(std::ios_base::binary);
+	writeU16(os, TOCLIENT_DETACHED_INVENTORY);
+	os<<serializeString(name);
+	inv->serialize(os);
+
+	// Make data buffer
+	std::string s = os.str();
+	SharedBuffer<u8> data((u8*)s.c_str(), s.size());
+	// Send as reliable
+	m_con.Send(peer_id, 0, data, true);
+}
+
+void Server::sendDetachedInventoryToAll(const std::string &name)
+{
+	DSTACK(__FUNCTION_NAME);
+
+	for(core::map<u16, RemoteClient*>::Iterator
+			i = m_clients.getIterator();
+			i.atEnd() == false; i++){
+		RemoteClient *client = i.getNode()->getValue();
+		sendDetachedInventory(name, client->peer_id);
+	}
+}
+
+void Server::sendDetachedInventories(u16 peer_id)
+{
+	DSTACK(__FUNCTION_NAME);
+
+	for(std::map<std::string, Inventory*>::iterator
+			i = m_detached_inventories.begin();
+			i != m_detached_inventories.end(); i++){
+		const std::string &name = i->first;
+		//Inventory *inv = i->second;
+		sendDetachedInventory(name, peer_id);
+	}
+}
+
 /*
 	Something random
 */
@@ -4493,6 +4511,21 @@ void Server::queueBlockEmerge(v3s16 blockpos, bool allow_generate)
 	m_emerge_queue.addBlock(PEER_ID_INEXISTENT, blockpos, flags);
 }
 
+Inventory* Server::createDetachedInventory(const std::string &name)
+{
+	if(m_detached_inventories.count(name) > 0){
+		infostream<<"Server clearing detached inventory \""<<name<<"\""<<std::endl;
+		delete m_detached_inventories[name];
+	} else {
+		infostream<<"Server creating detached inventory \""<<name<<"\""<<std::endl;
+	}
+	Inventory *inv = new Inventory(m_itemdef);
+	assert(inv);
+	m_detached_inventories[name] = inv;
+	sendDetachedInventoryToAll(name);
+	return inv;
+}
+
 // IGameDef interface
 // Under envlock
 IItemDefManager* Server::getItemDefManager()
diff --git a/src/server.h b/src/server.h
index f170cf7e1..4316bc21f 100644
--- a/src/server.h
+++ b/src/server.h
@@ -538,6 +538,9 @@ public:
 
 	void queueBlockEmerge(v3s16 blockpos, bool allow_generate);
 	
+	// Creates or resets inventory
+	Inventory* createDetachedInventory(const std::string &name);
+	
 	// Envlock and conlock should be locked when using Lua
 	lua_State *getLua(){ return m_lua; }
 	
@@ -627,6 +630,10 @@ private:
 	void sendMediaAnnouncement(u16 peer_id);
 	void sendRequestedMedia(u16 peer_id,
 			const core::list<MediaRequest> &tosend);
+	
+	void sendDetachedInventory(const std::string &name, u16 peer_id);
+	void sendDetachedInventoryToAll(const std::string &name);
+	void sendDetachedInventories(u16 peer_id);
 
 	/*
 		Something random
@@ -828,6 +835,12 @@ private:
 	*/
 	std::map<s32, ServerPlayingSound> m_playing_sounds;
 	s32 m_next_sound_id;
+
+	/*
+		Detached inventories (behind m_env_mutex)
+	*/
+	// key = name
+	std::map<std::string, Inventory*> m_detached_inventories;
 };
 
 /*