servermap.h

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// Luanti
// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (C) 2010-2024 celeron55, Perttu Ahola <celeron55@gmail.com>
 
#pragma once
 
#include <vector>
#include <memory>
 
#include "map.h"
#include "util/container.h" // UniqueQueue
#include "util/metricsbackend.h" // ptr typedefs
#include "map_settings_manager.h"
 
class Settings;
class MapDatabase;
class EmergeManager;
class ServerEnvironment;
struct BlockMakeData;
class MetricsBackend;
 
// TODO: this could wrap all calls to MapDatabase, including locking
struct MapDatabaseAccessor {
        std::mutex mutex;
        MapDatabase *dbase = nullptr;
        MapDatabase *dbase_ro = nullptr;

        void loadBlock(v3s16 blockpos, std::string &ret);
};
 
/*
        ServerMap
 
        This is the only map class that is able to generate map.
*/
 
class ServerMap : public Map
{
public:
        /*
                savedir: directory to which map data should be saved
        */
        ServerMap(const std::string &savedir, IGameDef *gamedef, EmergeManager *emerge, MetricsBackend *mb);
        ~ServerMap();
 
        /*
                Get a sector from somewhere.
                - Check memory
                - Check disk (doesn't load blocks)
                - Create blank one
        */
        MapSector *createSector(v2s16 p);
 
        /*
                Blocks are generated by using these and makeBlock().
        */
        bool blockpos_over_mapgen_limit(v3s16 p);
        bool initBlockMake(v3s16 blockpos, BlockMakeData *data);
        void finishBlockMake(BlockMakeData *data,
                std::map<v3s16, MapBlock*> *changed_blocks, ServerEnvironment *env);
        void cancelBlockMake(BlockMakeData *data);
 
        /*
                Get a block from somewhere.
                - Memory
                - Create blank
        */
        MapBlock *createBlock(v3s16 p);
 
        /*
                Forcefully get a block from somewhere (blocking!).
                - Memory
                - Load from disk
                - Create blank filled with CONTENT_IGNORE
 
        */
        MapBlock *emergeBlock(v3s16 p, bool create_blank=true) override;
 
        /*
                Try to get a block.
                If it does not exist in memory, add it to the emerge queue.
                - Memory
                - Emerge Queue (deferred disk or generate)
        */
        MapBlock *getBlockOrEmerge(v3s16 p3d, bool generate);
 
        bool isBlockInQueue(v3s16 pos);
 
        void addNodeAndUpdate(v3s16 p, MapNode n,
                        std::map<v3s16, MapBlock*> &modified_blocks,
                        bool remove_metadata) override;
 
        /*
                Database functions
        */
        static std::vector<std::string> getDatabaseBackends();
        static MapDatabase *createDatabase(const std::string &name, const std::string &savedir, Settings &conf);
 
        // Call these before and after saving of blocks
        void beginSave() override;
        void endSave() override;
 
        void save(ModifiedState save_level) override;
        void listAllLoadableBlocks(std::vector<v3s16> &dst);
        void listAllLoadedBlocks(std::vector<v3s16> &dst);
 
        MapgenParams *getMapgenParams();
 
        bool saveBlock(MapBlock *block) override;
        static bool saveBlock(MapBlock *block, MapDatabase *db, int compression_level = -1);

        static std::pair<std::unique_ptr<std::istream>, u8> createBlockIStream(const std::string *from_db);
 
        // Load block in a synchronous fashion
        MapBlock *loadBlock(v3s16 p);
        MapBlock *loadBlock(std::istream &is, v3s16 p, u8 version);
 
        // Blocks are removed from the map but not deleted from memory until
        // deleteDetachedBlocks() is called, since pointers to them may still exist
        // when deleteBlock() is called.
        bool deleteBlock(v3s16 blockpos) override;
 
        void deleteDetachedBlocks();
 
        void step();
 
        void updateVManip(v3s16 pos);
 
        // For debug printing
        void PrintInfo(std::ostream &out) override;
 
        bool isSavingEnabled(){ return m_map_saving_enabled; }
 
        u64 getSeed();

        bool repairBlockLight(v3s16 blockpos,
                std::map<v3s16, MapBlock *> *modified_blocks);
 
        void transformLiquids(std::map<v3s16, MapBlock*> & modified_blocks,
                        ServerEnvironment *env);
        void transformLiquidsLocal(std::map<v3s16, MapBlock*> &modified_blocks, UniqueQueue<v3s16> &liquid_queue,
                        ServerEnvironment *env, u32 liquid_loop_max);
        void transforming_liquid_add(v3s16 p);
 
        MapSettingsManager settings_mgr;
 
protected:
 
        void reportMetrics(u64 save_time_us, u32 saved_blocks, u32 all_blocks) override;
 
private:
        friend class ModApiMapgen; // for m_transforming_liquid
 
        // extra border area during mapgen (in blocks)
        constexpr static v3s16 EMERGE_EXTRA_BORDER{1, 1, 1};
 
        // Emerge manager
        EmergeManager *m_emerge;
 
        std::string m_savedir;
        bool m_map_saving_enabled;
 
        int m_map_compression_level;
 
        std::set<v3s16> m_chunks_in_progress;
 
        // used by deleteBlock() and deleteDetachedBlocks()
        std::vector<std::unique_ptr<MapBlock>> m_detached_blocks;
 
        // Queued transforming water nodes
        UniqueQueue<v3s16> m_transforming_liquid;
        f32 m_transforming_liquid_loop_count_multiplier = 1.0f;
        u32 m_unprocessed_count = 0;
        u64 m_inc_trending_up_start_time = 0; // milliseconds
        bool m_queue_size_timer_started = false;
 
        /*
                Metadata is re-written on disk only if this is true.
                This is reset to false when written on disk.
        */
        bool m_map_metadata_changed = true;
 
        MapDatabaseAccessor m_db;
 
        // Map metrics
        MetricGaugePtr m_loaded_blocks_gauge;
        MetricCounterPtr m_save_time_counter;
        MetricCounterPtr m_save_count_counter;
};