src/serialization.h


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/*
Minetest
Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>

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.
*/

#pragma once

#include "irrlichttypes.h"
#include "exceptions.h"
#include <iostream>
#include "util/pointer.h"

/*
	Map format serialization version
	--------------------------------

	For map data (blocks, nodes, sectors).

	NOTE: The goal is to increment this so that saved maps will be
	      loadable by any version. Other compatibility is not
		  maintained.

	0: original networked test with 1-byte nodes
	1: update with 2-byte nodes
	2: lighting is transmitted in param
	3: optional fetching of far blocks
	4: block compression
	5: sector objects NOTE: block compression was left accidentally out
	6: failed attempt at switching block compression on again
	7: block compression switched on again
	8: server-initiated block transfers and all kinds of stuff
	9: block objects
	10: water pressure
	11: zlib'd blocks, block flags
	12: UnlimitedHeightmap now uses interpolated areas
	13: Mapgen v2
	14: NodeMetadata
	15: StaticObjects
	16: larger maximum size of node metadata, and compression
	17: MapBlocks contain timestamp
	18: new generator (not really necessary, but it's there)
	19: new content type handling
	20: many existing content types translated to extended ones
	21: dynamic content type allocation
	22: minerals removed, facedir & wallmounted changed
	23: new node metadata format
	24: 16-bit node ids and node timers (never released as stable)
	25: Improved node timer format
	26: Never written; read the same as 25
	27: Added light spreading flags to blocks
	28: Added "private" flag to NodeMetadata
*/
// This represents an uninitialized or invalid format
#define SER_FMT_VER_INVALID 255
// Highest supported serialization version
#define SER_FMT_VER_HIGHEST_READ 28
// Saved on disk version
#define SER_FMT_VER_HIGHEST_WRITE 28
// Lowest supported serialization version
#define SER_FMT_VER_LOWEST_READ 0
// Lowest serialization version for writing
// Can't do < 24 anymore; we have 16-bit dynamically allocated node IDs
// in memory; conversion just won't work in this direction.
#define SER_FMT_VER_LOWEST_WRITE 24

inline bool ser_ver_supported(s32 v) {
	return v >= SER_FMT_VER_LOWEST_READ && v <= SER_FMT_VER_HIGHEST_READ;
}

/*
	Misc. serialization functions
*/

void compressZlib(const u8 *data, size_t data_size, std::ostream &os, int level = -1);
void compressZlib(const std::string &data, std::ostream &os, int level = -1);
void decompressZlib(std::istream &is, std::ostream &os, size_t limit = 0);

// These choose between zlib and a self-made one according to version
void compress(const SharedBuffer<u8> &data, std::ostream &os, u8 version);
//void compress(const std::string &data, std::ostream &os, u8 version);
void decompress(std::istream &is, std::ostream &os, u8 version);
/*
Minetest-c55
Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>

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 2 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 General Public License for more details.

You should have received a copy of the GNU 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.
*/

#ifndef CLIENT_HEADER
#define CLIENT_HEADER

#ifndef SERVER

#include "connection.h"
#include "environment.h"
#include "common_irrlicht.h"
#include "jmutex.h"
#include <ostream>
#include <set>
#include <vector>
#include "clientobject.h"
#include "utility.h" // For IntervalLimiter
#include "gamedef.h"
#include "inventorymanager.h"
#include "filesys.h"
#include "filecache.h"

struct MeshMakeData;
class MapBlockMesh;
class IGameDef;
class IWritableTextureSource;
class IWritableItemDefManager;
class IWritableNodeDefManager;
//class IWritableCraftDefManager;
class ClientEnvironment;
struct MapDrawControl;
class MtEventManager;

class ClientNotReadyException : public BaseException
{
public:
	ClientNotReadyException(const char *s):
		BaseException(s)
	{}
};

struct QueuedMeshUpdate
{
	v3s16 p;
	MeshMakeData *data;
	bool ack_block_to_server;

	QueuedMeshUpdate();
	~QueuedMeshUpdate();
};

/*
	A thread-safe queue of mesh update tasks
*/
class MeshUpdateQueue
{
public:
	MeshUpdateQueue();

	~MeshUpdateQueue();
	
	/*
		peer_id=0 adds with nobody to send to
	*/
	void addBlock(v3s16 p, MeshMakeData *data,
			bool ack_block_to_server, bool urgent);

	// Returned pointer must be deleted
	// Returns NULL if queue is empty
	QueuedMeshUpdate * pop();

	u32 size()
	{
		JMutexAutoLock lock(m_mutex);
		return m_queue.size();
	}
	
private:
	std::vector<QueuedMeshUpdate*> m_queue;
	std::set<v3s16> m_urgents;
	JMutex m_mutex;
};

struct MeshUpdateResult
{
	v3s16 p;
	MapBlockMesh *mesh;
	bool ack_block_to_server;

	MeshUpdateResult():
		p(-1338,-1338,-1338),
		mesh(NULL),
		ack_block_to_server(false)
	{
	}
};

class MeshUpdateThread : public SimpleThread
{
public:

	MeshUpdateThread(IGameDef *gamedef):
		m_gamedef(gamedef)
	{
	}

	void * Thread();

	MeshUpdateQueue m_queue_in;

	MutexedQueue<MeshUpdateResult> m_queue_out;

	IGameDef *m_gamedef;
};

enum ClientEventType
{
	CE_NONE,
	CE_PLAYER_DAMAGE,
	CE_PLAYER_FORCE_MOVE,
	CE_DEATHSCREEN,
	CE_TEXTURES_UPDATED
};

struct ClientEvent
{
	ClientEventType type;
	union{
		struct{
		} none;
		struct{
			u8 amount;
		} player_damage;
		struct{
			f32 pitch;
			f32 yaw;
		} player_force_move;
		struct{
			bool set_camera_point_target;
			f32 camera_point_target_x;
			f32 camera_point_target_y;
			f32 camera_point_target_z;
		} deathscreen;
		struct{
		} textures_updated;
	};
};

class Client : public con::PeerHandler, public InventoryManager, public IGameDef
{
public:
	/*
		NOTE: Nothing is thread-safe here.
	*/

	Client(
			IrrlichtDevice *device,
			const char *playername,
			std::string password,
			MapDrawControl &control,
			IWritableTextureSource *tsrc,
			IWritableItemDefManager *itemdef,
			IWritableNodeDefManager *nodedef,
			ISoundManager *sound,
			MtEventManager *event
	);
	
	~Client();
	/*
		The name of the local player should already be set when
		calling this, as it is sent in the initialization.
	*/
	void connect(Address address);
	/*
		returns true when
			m_con.Connected() == true
			AND m_server_ser_ver != SER_FMT_VER_INVALID
		throws con::PeerNotFoundException if connection has been deleted,
		eg. timed out.
	*/
	bool connectedAndInitialized();
	/*
		Stuff that references the environment is valid only as
		long as this is not called. (eg. Players)
		If this throws a PeerNotFoundException, the connection has
		timed out.
	*/
	void step(float dtime);

	void ProcessData(u8 *data, u32 datasize, u16 sender_peer_id);
	// Returns true if something was received
	bool AsyncProcessPacket();
	bool AsyncProcessData();
	void Send(u16 channelnum, SharedBuffer<u8> data, bool reliable);

	void interact(u8 action, const PointedThing& pointed);

	void sendSignNodeText(v3s16 p, std::string text);
	void sendInventoryAction(InventoryAction *a);
	void sendChatMessage(const std::wstring &message);
	void sendChangePassword(const std::wstring oldpassword,
		const std::wstring newpassword);
	void sendDamage(u8 damage);
	void sendRespawn();

	ClientEnvironment& getEnv()
	{ return m_env; }
	
	// Causes urgent mesh updates (unlike Map::add/removeNodeWithEvent)
	void removeNode(v3s16 p);
	void addNode(v3s16 p, MapNode n);
	
	void setPlayerControl(PlayerControl &control);

	void selectPlayerItem(u16 item);
	u16 getPlayerItem() const
	{ return m_playeritem; }

	// Returns true if the inventory of the local player has been
	// updated from the server. If it is true, it is set to false.
	bool getLocalInventoryUpdated();
	// Copies the inventory of the local player to parameter
	void getLocalInventory(Inventory &dst);
	
	/* InventoryManager interface */
	Inventory* getInventory(const InventoryLocation &loc);
	void inventoryAction(InventoryAction *a);

	// Gets closest object pointed by the shootline
	// Returns NULL if not found
	ClientActiveObject * getSelectedActiveObject(
			f32 max_d,
			v3f from_pos_f_on_map,
			core::line3d<f32> shootline_on_map
	);

	// Prints a line or two of info
	void printDebugInfo(std::ostream &os);

	core::list<std::wstring> getConnectedPlayerNames();

	float getAnimationTime();

	int getCrackLevel();
	void setCrack(int level, v3s16 pos);

	u16 getHP();

	float getAvgRtt()
	{
		try{
			return m_con.GetPeerAvgRTT(PEER_ID_SERVER);
		} catch(con::PeerNotFoundException){
			return 1337;
		}
	}

	bool getChatMessage(std::wstring &message);
	void typeChatMessage(const std::wstring& message);

	u64 getMapSeed(){ return m_map_seed; }

	void addUpdateMeshTask(v3s16 blockpos, bool ack_to_server=false, bool urgent=false);
	// Including blocks at appropriate edges
	void addUpdateMeshTaskWithEdge(v3s16 blockpos, bool ack_to_server=false, bool urgent=false);
	void addUpdateMeshTaskForNode(v3s16 nodepos, bool ack_to_server=false, bool urgent=false);

	// Get event from queue. CE_NONE is returned if queue is empty.
	ClientEvent getClientEvent();
	
	bool accessDenied()
	{ return m_access_denied; }

	std::wstring accessDeniedReason()
	{ return m_access_denied_reason; }

	float mediaReceiveProgress()
	{ return m_media_receive_progress; }

	bool texturesReceived()
	{ return m_media_received; }
	bool itemdefReceived()
	{ return m_itemdef_received; }
	bool nodedefReceived()
	{ return m_nodedef_received; }
	
	void afterContentReceived();

	float getRTT(void);

	// IGameDef interface
	virtual IItemDefManager* getItemDefManager();
	virtual INodeDefManager* getNodeDefManager();
	virtual ICraftDefManager* getCraftDefManager();
	virtual ITextureSource* getTextureSource();
	virtual u16 allocateUnknownNodeId(const std::string &name);
	virtual ISoundManager* getSoundManager();
	virtual MtEventManager* getEventManager();

private:
	
	// Insert a media file appropriately into the appropriate manager
	bool loadMedia(const std::string &data, const std::string &filename);
	
	// Virtual methods from con::PeerHandler
	void peerAdded(con::Peer *peer);
	void deletingPeer(con::Peer *peer, bool timeout);
	
	void ReceiveAll();
	void Receive();
	
	void sendPlayerPos();
	// This sends the player's current name etc to the server
	void sendPlayerInfo();
	// Send the item number 'item' as player item to the server
	void sendPlayerItem(u16 item);
	
	float m_packetcounter_timer;
	float m_connection_reinit_timer;
	float m_avg_rtt_timer;
	float m_playerpos_send_timer;
	float m_ignore_damage_timer; // Used after server moves player
	IntervalLimiter m_map_timer_and_unload_interval;

	IWritableTextureSource *m_tsrc;
	IWritableItemDefManager *m_itemdef;
	IWritableNodeDefManager *m_nodedef;
	ISoundManager *m_sound;
	MtEventManager *m_event;

	MeshUpdateThread m_mesh_update_thread;
	ClientEnvironment m_env;
	con::Connection m_con;
	IrrlichtDevice *m_device;
	// Server serialization version
	u8 m_server_ser_ver;
	u16 m_playeritem;
	bool m_inventory_updated;
	Inventory *m_inventory_from_server;
	float m_inventory_from_server_age;
	core::map<v3s16, bool> m_active_blocks;
	PacketCounter m_packetcounter;
	// Block mesh animation parameters
	float m_animation_time;
	int m_crack_level;
	v3s16 m_crack_pos;
	// 0 <= m_daynight_i < DAYNIGHT_CACHE_COUNT
	//s32 m_daynight_i;
	//u32 m_daynight_ratio;
	Queue<std::wstring> m_chat_queue;
	// The seed returned by the server in TOCLIENT_INIT is stored here
	u64 m_map_seed;
	std::string m_password;
	bool m_access_denied;
	std::wstring m_access_denied_reason;
	Queue<ClientEvent> m_client_event_queue;
	FileCache m_media_cache;
	// Mapping from media file name to SHA1 checksum
	core::map<std::string, std::string> m_media_name_sha1_map;
	float m_media_receive_progress;
	bool m_media_received;
	bool m_itemdef_received;
	bool m_nodedef_received;
	friend class FarMesh;

	// time_of_day speed approximation for old protocol
	bool m_time_of_day_set;
	float m_last_time_of_day_f;
	float m_time_of_day_update_timer;

	// Sounds
	float m_removed_sounds_check_timer;
	// Mapping from server sound ids to our sound ids
	std::map<s32, int> m_sounds_server_to_client;
	// And the other way!
	std::map<int, s32> m_sounds_client_to_server;
	// And relations to objects
	std::map<int, u16> m_sounds_to_objects;
};

#endif // !SERVER

#endif // !CLIENT_HEADER