mirror of
https://github.com/minetest/minetestmapper.git
synced 2024-11-13 22:20:29 +01:00
113 lines
2.8 KiB
C++
113 lines
2.8 KiB
C++
#include <stdexcept>
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#include <sstream>
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#include <fstream>
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#include "db-redis.h"
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#include "types.h"
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#include "util.h"
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static inline int64_t stoi64(const std::string &s)
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{
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std::stringstream tmp(s);
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int64_t t;
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tmp >> t;
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return t;
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}
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static inline std::string i64tos(int64_t i)
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{
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std::ostringstream os;
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os << i;
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return os.str();
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}
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std::string get_setting_default(std::string name, std::istream &is, const std::string def)
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{
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try {
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return get_setting(name, is);
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} catch(std::runtime_error e) {
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return def;
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}
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}
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DBRedis::DBRedis(const std::string &mapdir)
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{
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std::ifstream ifs((mapdir + "/world.mt").c_str());
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if(!ifs.good())
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throw std::runtime_error("Failed to read world.mt");
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std::string tmp;
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try {
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tmp = get_setting("redis_address", ifs);
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ifs.seekg(0);
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hash = get_setting("redis_hash", ifs);
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ifs.seekg(0);
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} catch(std::runtime_error e) {
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throw std::runtime_error("Set redis_address and redis_hash in world.mt to use the redis backend");
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}
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const char *addr = tmp.c_str();
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int port = stoi64(get_setting_default("redis_port", ifs, "6379"));
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ctx = redisConnect(addr, port);
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if(!ctx)
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throw std::runtime_error("Cannot allocate redis context");
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else if(ctx->err) {
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std::string err = std::string("Connection error: ") + ctx->errstr;
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redisFree(ctx);
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throw std::runtime_error(err);
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}
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loadPosCache();
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}
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DBRedis::~DBRedis()
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{
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redisFree(ctx);
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}
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std::vector<BlockPos> DBRedis::getBlockPos()
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{
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return posCache;
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}
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void DBRedis::loadPosCache()
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{
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redisReply *reply;
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reply = (redisReply*) redisCommand(ctx, "HKEYS %s", hash.c_str());
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if(!reply)
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throw std::runtime_error(std::string("redis command 'HKEYS %s' failed: ") + ctx->errstr);
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if(reply->type != REDIS_REPLY_ARRAY)
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throw std::runtime_error("Failed to get keys from database");
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for(size_t i = 0; i < reply->elements; i++) {
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if(reply->element[i]->type != REDIS_REPLY_STRING)
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throw std::runtime_error("Got wrong response to 'HKEYS %s' command");
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posCache.push_back(decodeBlockPos(stoi64(reply->element[i]->str)));
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}
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freeReplyObject(reply);
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}
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void DBRedis::getBlocksOnZ(std::map<int16_t, BlockList> &blocks, int16_t zPos)
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{
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redisReply *reply;
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std::string tmp;
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for (std::vector<BlockPos>::iterator it = posCache.begin(); it != posCache.end(); ++it) {
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if (it->z != zPos) {
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continue;
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}
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tmp = i64tos(encodeBlockPos(*it));
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reply = (redisReply*) redisCommand(ctx, "HGET %s %s", hash.c_str(), tmp.c_str());
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if(!reply)
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throw std::runtime_error(std::string("redis command 'HGET %s %s' failed: ") + ctx->errstr);
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if (reply->type == REDIS_REPLY_STRING && reply->len != 0) {
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Block b(*it, ustring((const unsigned char *) reply->str, reply->len));
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blocks[b.first.x].push_back(b);
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} else
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throw std::runtime_error("Got wrong response to 'HGET %s %s' command");
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freeReplyObject(reply);
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}
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}
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