minetestmapper/include/db-redis.h

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#pragma once
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#include "db.h"
#include <unordered_map>
#include <utility>
#include <functional>
#include <hiredis/hiredis.h>
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class DBRedis : public DB {
public:
DBRedis(const std::string &mapdir);
std::vector<BlockPos> getBlockPos(BlockPos min, BlockPos max) override;
void getBlocksOnXZ(BlockList &blocks, int16_t x, int16_t z,
int16_t min_y, int16_t max_y) override;
void getBlocksByPos(BlockList &blocks,
const std::vector<BlockPos> &positions) override;
~DBRedis() override;
bool preferRangeQueries() const override { return false; }
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private:
using pos2d = std::pair<int16_t, int16_t>;
static const char *replyTypeStr(int type);
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void loadPosCache();
void HMGET(const std::vector<BlockPos> &positions,
std::function<void(std::size_t, ustring)> result);
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// indexed by Z, contains all (x,y) position pairs
std::unordered_map<int16_t, std::vector<pos2d>> posCache;
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redisContext *ctx;
std::string hash;
};