serverenvironment.h

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// Luanti
// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (C) 2010-2017 celeron55, Perttu Ahola <celeron55@gmail.com>
 
#pragma once
 
#include <set>
#include <utility>
 
#include "activeobject.h"
#include "environment.h"
#include "servermap.h"
#include "settings.h"
#include "server/activeobjectmgr.h"
#include "util/numeric.h"
#include "util/metricsbackend.h"
 
class IGameDef;
struct GameParams;
class RemotePlayer;
class PlayerDatabase;
class AuthDatabase;
class PlayerSAO;
class ServerEnvironment;
class ActiveBlockModifier;
struct StaticObject;
class ServerActiveObject;
class Server;
class ServerScripting;
enum AccessDeniedCode : u8;
typedef u16 session_t;
 
/*
        {Active, Loading} block modifier interface.
 
        These are fed into ServerEnvironment at initialization time;
        ServerEnvironment handles deleting them.
*/
 
class ActiveBlockModifier
{
public:
        ActiveBlockModifier() = default;
        virtual ~ActiveBlockModifier() = default;
 
        // Set of contents to trigger on
        virtual const std::vector<std::string> &getTriggerContents() const = 0;
        // Set of required neighbors (trigger doesn't happen if none are found)
        // Empty = do not check neighbors
        virtual const std::vector<std::string> &getRequiredNeighbors() const = 0;
        // Set of without neighbors (trigger doesn't happen if any are found)
        // Empty = do not check neighbors
        virtual const std::vector<std::string> &getWithoutNeighbors() const = 0;
        // Trigger interval in seconds
        virtual float getTriggerInterval() = 0;
        // Random chance of (1 / return value), 0 is disallowed
        virtual u32 getTriggerChance() = 0;
        // Whether to modify chance to simulate time lost by an unnattended block
        virtual bool getSimpleCatchUp() = 0;
        // get min Y for apply abm
        virtual s16 getMinY() = 0;
        // get max Y for apply abm
        virtual s16 getMaxY() = 0;
        // This is called usually at interval for 1/chance of the nodes
        virtual void trigger(ServerEnvironment *env, v3s16 p, MapNode n){};
        virtual void trigger(ServerEnvironment *env, v3s16 p, MapNode n,
                u32 active_object_count, u32 active_object_count_wider){};
};
 
struct ABMWithState
{
        ActiveBlockModifier *abm;
        float timer = 0.0f;
 
        ABMWithState(ActiveBlockModifier *abm_);
};
 
struct LoadingBlockModifierDef
{
        // Set of contents to trigger on
        std::vector<std::string> trigger_contents;
        std::string name;
        bool run_at_every_load = false;
 
        virtual ~LoadingBlockModifierDef() = default;
 
        virtual void trigger(ServerEnvironment *env, MapBlock *block,
                const std::unordered_set<v3s16> &positions, float dtime_s) {};
};
 
class LBMContentMapping
{
public:
        typedef std::vector<LoadingBlockModifierDef*> lbm_vector;
        typedef std::unordered_map<content_t, lbm_vector> lbm_map;
 
        LBMContentMapping() = default;
        void addLBM(LoadingBlockModifierDef *lbm_def, IGameDef *gamedef);
        const lbm_map::mapped_type *lookup(content_t c) const;
        const lbm_vector &getList() const { return lbm_list; }
 
        // This struct owns the LBM pointers.
        ~LBMContentMapping();
        DISABLE_CLASS_COPY(LBMContentMapping);
        ALLOW_CLASS_MOVE(LBMContentMapping);
 
private:
        lbm_vector lbm_list;
        lbm_map map;
};
 
class LBMManager
{
public:
        LBMManager() = default;
        ~LBMManager();
 
        // Don't call this after loadIntroductionTimes() ran.
        void addLBMDef(LoadingBlockModifierDef *lbm_def);
 
        void loadIntroductionTimes(const std::string &times,
                IGameDef *gamedef, u32 now);
 
        // Don't call this before loadIntroductionTimes() ran.
        std::string createIntroductionTimesString();
 
        // Don't call this before loadIntroductionTimes() ran.
        void applyLBMs(ServerEnvironment *env, MapBlock *block,
                        u32 stamp, float dtime_s);
 
        // Warning: do not make this std::unordered_map, order is relevant here
        typedef std::map<u32, LBMContentMapping> lbm_lookup_map;
 
private:
        // Once we set this to true, we can only query,
        // not modify
        bool m_query_mode = false;
 
        // For m_query_mode == false:
        // The key of the map is the LBM def's name.
        std::unordered_map<std::string, LoadingBlockModifierDef *> m_lbm_defs;
 
        // For m_query_mode == true:
        // The key of the map is the LBM def's first introduction time.
        lbm_lookup_map m_lbm_lookup;
 
        // Returns an iterator to the LBMs that were introduced
        // after the given time. This is guaranteed to return
        // valid values for everything
        lbm_lookup_map::const_iterator getLBMsIntroducedAfter(u32 time)
        { return m_lbm_lookup.lower_bound(time); }
};
 
/*
        List of active blocks, used by ServerEnvironment
*/
 
class ActiveBlockList
{
public:
        void update(std::vector<PlayerSAO*> &active_players,
                s16 active_block_range,
                s16 active_object_range,
                std::set<v3s16> &blocks_removed,
                std::set<v3s16> &blocks_added,
                std::set<v3s16> &extra_blocks_added);
 
        bool contains(v3s16 p) const {
                return (m_list.find(p) != m_list.end());
        }
 
        auto size() const {
                return m_list.size();
        }
 
        void clear() {
                m_list.clear();
        }
 
        void remove(v3s16 p) {
                m_list.erase(p);
                m_abm_list.erase(p);
        }
 
        std::set<v3s16> m_list;
        std::set<v3s16> m_abm_list;
        // list of blocks that are always active, not modified by this class
        std::set<v3s16> m_forceloaded_list;
};
 
/*
        ServerEnvironment::m_on_mapblocks_changed_receiver
*/
struct OnMapblocksChangedReceiver : public MapEventReceiver {
        std::unordered_set<v3s16> modified_blocks;
        bool receiving = false;
 
        void onMapEditEvent(const MapEditEvent &event) override;
};
 
/*
        Operation mode for ServerEnvironment::clearObjects()
*/
enum ClearObjectsMode {
        // Load and go through every mapblock, clearing objects
                CLEAR_OBJECTS_MODE_FULL,
 
        // Clear objects immediately in loaded mapblocks;
        // clear objects in unloaded mapblocks only when the mapblocks are next activated.
                CLEAR_OBJECTS_MODE_QUICK,
};
 
class ServerEnvironment final : public Environment
{
public:
        ServerEnvironment(std::unique_ptr<ServerMap> map, Server *server, MetricsBackend *mb);
        ~ServerEnvironment();
 
        void init();
 
        Map & getMap();
 
        ServerMap & getServerMap();
 
        //TODO find way to remove this fct!
        ServerScripting* getScriptIface()
        { return m_script; }
 
        Server *getGameDef()
        { return m_server; }
 
        float getSendRecommendedInterval()
        { return m_recommended_send_interval; }
 
        // Save players
        void saveLoadedPlayers(bool force = false);
        void savePlayer(RemotePlayer *player);
        PlayerSAO *loadPlayer(RemotePlayer *player, bool *new_player, session_t peer_id,
                bool is_singleplayer);
        void addPlayer(RemotePlayer *player);
        void removePlayer(RemotePlayer *player);
        bool removePlayerFromDatabase(const std::string &name);
 
        /*
                Save and load time of day and game timer
        */
        void saveMeta();
        void loadMeta();
 
        u32 addParticleSpawner(float exptime);
        u32 addParticleSpawner(float exptime, u16 attached_id);
        void deleteParticleSpawner(u32 id, bool remove_from_object = true);
 
        /*
                External ActiveObject interface
                -------------------------------------------
        */
 
        ServerActiveObject* getActiveObject(u16 id)
        {
                return m_ao_manager.getActiveObject(id);
        }
 
        /*
                Add an active object to the environment.
                Environment handles deletion of object.
                Object may be deleted by environment immediately.
                If id of object is 0, assigns a free id to it.
                Returns the id of the object.
                Returns 0 if not added and thus deleted.
        */
        u16 addActiveObject(std::unique_ptr<ServerActiveObject> object);
 
        void invalidateActiveObjectObserverCaches();
 
        /*
                Find out what new objects have been added to
                inside a radius around a position
        */
        void getAddedActiveObjects(PlayerSAO *playersao, s16 radius,
                s16 player_radius,
                const std::set<u16> &current_objects,
                std::vector<u16> &added_objects);
 
        /*
                Find out what new objects have been removed from
                inside a radius around a position
        */
        void getRemovedActiveObjects(PlayerSAO *playersao, s16 radius,
                s16 player_radius,
                const std::set<u16> &current_objects,
                std::vector<std::pair<bool /* gone? */, u16>> &removed_objects);
 
        /*
                Get the next message emitted by some active object.
                Returns false if no messages are available, true otherwise.
        */
        bool getActiveObjectMessage(ActiveObjectMessage *dest);
 
        virtual void getSelectedActiveObjects(
                const core::line3d<f32> &shootline_on_map,
                std::vector<PointedThing> &objects,
                const std::optional<Pointabilities> &pointabilities
        );
 
        /*
                Activate objects and dynamically modify for the dtime determined
                from timestamp and additional_dtime
        */
        void activateBlock(MapBlock *block, u32 additional_dtime=0);
 
        /*
                {Active,Loading}BlockModifiers
                -------------------------------------------
        */
 
        void addActiveBlockModifier(ActiveBlockModifier *abm);
        void addLoadingBlockModifierDef(LoadingBlockModifierDef *lbm);
 
        /*
                Other stuff
                -------------------------------------------
        */
 
        // Script-aware node setters
        bool setNode(v3s16 p, const MapNode &n);
        bool removeNode(v3s16 p);
        bool swapNode(v3s16 p, const MapNode &n);
 
        // Find the daylight value at pos with a Depth First Search
        u8 findSunlight(v3s16 pos) const;
 
        // Find all active objects inside a radius around a point
        void getObjectsInsideRadius(std::vector<ServerActiveObject *> &objects, const v3f &pos, float radius,
                        std::function<bool(ServerActiveObject *obj)> include_obj_cb)
        {
                return m_ao_manager.getObjectsInsideRadius(pos, radius, objects, include_obj_cb);
        }
 
        // Find all active objects inside a box
        void getObjectsInArea(std::vector<ServerActiveObject *> &objects, const aabb3f &box,
                        std::function<bool(ServerActiveObject *obj)> include_obj_cb)
        {
                return m_ao_manager.getObjectsInArea(box, objects, include_obj_cb);
        }
 
        // Clear objects, loading and going through every MapBlock
        void clearObjects(ClearObjectsMode mode);
 
        // to be called before destructor
        void deactivateBlocksAndObjects();
 
        // This makes stuff happen
        void step(f32 dtime);
 
        u32 getGameTime() const { return m_game_time; }
 
        void reportMaxLagEstimate(float f) { m_max_lag_estimate = f; }
        float getMaxLagEstimate() const { return m_max_lag_estimate; }
 
        std::set<v3s16>* getForceloadedBlocks() { return &m_active_blocks.m_forceloaded_list; }
 
        // Sorted by how ready a mapblock is
        enum BlockStatus {
                BS_UNKNOWN,
                BS_EMERGING,
                BS_LOADED,
                BS_ACTIVE // always highest value
        };
        BlockStatus getBlockStatus(v3s16 blockpos);
 
        // Sets the static object status all the active objects in the specified block
        // This is only really needed for deleting blocks from the map
        void setStaticForActiveObjectsInBlock(v3s16 blockpos,
                bool static_exists, v3s16 static_block=v3s16(0,0,0));
 
        RemotePlayer *getPlayer(const session_t peer_id);
        RemotePlayer *getPlayer(const std::string &name, bool match_invalid_peer = false);
        const std::vector<RemotePlayer *> getPlayers() const { return m_players; }
        u32 getPlayerCount() const { return m_players.size(); }
 
        static bool migratePlayersDatabase(const GameParams &game_params,
                        const Settings &cmd_args);
 
        AuthDatabase *getAuthDatabase() { return m_auth_database; }
        static bool migrateAuthDatabase(const GameParams &game_params,
                        const Settings &cmd_args);
private:
 
        void loadDefaultMeta();
 
        static PlayerDatabase *openPlayerDatabase(const std::string &name,
                        const std::string &savedir, const Settings &conf);
        static AuthDatabase *openAuthDatabase(const std::string &name,
                        const std::string &savedir, const Settings &conf);
        /*
                Internal ActiveObject interface
                -------------------------------------------
        */
 
        /*
                Add an active object to the environment.
 
                Called by addActiveObject.
 
                Object may be deleted by environment immediately.
                If id of object is 0, assigns a free id to it.
                Returns the id of the object.
                Returns 0 if not added and thus deleted.
        */
        u16 addActiveObjectRaw(std::unique_ptr<ServerActiveObject> object,
                        const StaticObject *from_static, u32 dtime_s);
 
        /*
                Remove all objects that satisfy (isGone() && m_known_by_count==0)
        */
        void removeRemovedObjects();
 
        /*
                Convert stored objects from block to active
        */
        void activateObjects(MapBlock *block, u32 dtime_s);
 
        /*
                Convert objects that are not in active blocks to static.
 
                If m_known_by_count != 0, active object is not deleted, but static
                data is still updated.
 
                If force_delete is set, active object is deleted nevertheless. It
                shall only be set so in the destructor of the environment.
        */
        void deactivateFarObjects(bool force_delete);
 
        /*
                A few helpers used by the three above methods
        */
        void deleteStaticFromBlock(
                        ServerActiveObject *obj, u16 id, u32 mod_reason, bool no_emerge);
        bool saveStaticToBlock(v3s16 blockpos, u16 store_id,
                        ServerActiveObject *obj, const StaticObject &s_obj, u32 mod_reason);
 
        void processActiveObjectRemove(ServerActiveObject *obj);
 
        /*
                Member variables
        */
 
        // The map
        std::unique_ptr<ServerMap> m_map;
        // Lua state
        ServerScripting* m_script;
        // Server definition
        Server *m_server;
        // Active Object Manager
        server::ActiveObjectMgr m_ao_manager;
        // on_mapblocks_changed map event receiver
        OnMapblocksChangedReceiver m_on_mapblocks_changed_receiver;
        // Outgoing network message buffer for active objects
        std::queue<ActiveObjectMessage> m_active_object_messages;
        // Some timers
        float m_send_recommended_timer = 0.0f;
        IntervalLimiter m_object_management_interval;
        // List of active blocks
        ActiveBlockList m_active_blocks;
        int m_fast_active_block_divider = 1;
        IntervalLimiter m_active_blocks_mgmt_interval;
        IntervalLimiter m_active_block_modifier_interval;
        IntervalLimiter m_active_blocks_nodemetadata_interval;
        // Whether the variables below have been read from file yet
        bool m_meta_loaded = false;
        // Time from the beginning of the game in seconds.
        // Incremented in step().
        u32 m_game_time = 0;
        // A helper variable for incrementing the latter
        float m_game_time_fraction_counter = 0.0f;
        // Time of last clearObjects call (game time).
        // When a mapblock older than this is loaded, its objects are cleared.
        u32 m_last_clear_objects_time = 0;
        // Active block modifiers
        std::vector<ABMWithState> m_abms;
        LBMManager m_lbm_mgr;
        // An interval for generally sending object positions and stuff
        float m_recommended_send_interval = 0.1f;
        // Estimate for general maximum lag as determined by server.
        // Can raise to high values like 15s with eg. map generation mods.
        float m_max_lag_estimate = 0.1f;
 
        // peer_ids in here should be unique, except that there may be many 0s
        std::vector<RemotePlayer*> m_players;
 
        PlayerDatabase *m_player_database = nullptr;
        AuthDatabase *m_auth_database = nullptr;
 
        // Particles
        IntervalLimiter m_particle_management_interval;
        std::unordered_map<u32, float> m_particle_spawners;
        u32 m_particle_spawners_id_last_used = 0;
        std::unordered_map<u32, u16> m_particle_spawner_attachments;
 
        // Environment metrics
        MetricCounterPtr m_step_time_counter;
        MetricGaugePtr m_active_block_gauge;
        MetricGaugePtr m_active_object_gauge;
 
        std::unique_ptr<ServerActiveObject> createSAO(ActiveObjectType type, v3f pos,
                        const std::string &data);
};