Add redis database backend

db-redis.h

@@ -0,0 +1,22 @@
+#ifndef DB_REDIS_HEADER
+#define DB_REDIS_HEADER
+
+#include "db.h"
+#include <hiredis.h>
+
+class DBRedis : public DB {
+public:
+	DBRedis(const std::string &mapdir);
+	virtual std::vector<BlockPos> getBlockPos();
+	virtual void getBlocksOnZ(std::map<int16_t, BlockList> &blocks, int16_t zPos);
+	~DBRedis();
+private:
+	void loadPosCache();
+
+	std::vector<BlockPos> posCache;
+
+	redisContext *ctx;
+	std::string hash;
+};
+
+#endif // DB_REDIS_HEADER