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/*
Minetest
Copyright (C) 2014 celeron55, Perttu Ahola <celeron55@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#if USE_REDIS
/*
Redis databases
*/
#include "database-redis.h"
#include <hiredis.h>
#include "map.h"
#include "mapsector.h"
#include "mapblock.h"
#include "serialization.h"
#include "main.h"
#include "settings.h"
#include "log.h"
Database_Redis::Database_Redis(ServerMap *map, std::string savedir)
{
Settings conf;
conf.readConfigFile((std::string(savedir) + DIR_DELIM + "world.mt").c_str());
std::string tmp;
try {
tmp = conf.get("redis_address");
hash = conf.get("redis_hash");
} catch(SettingNotFoundException e) {
throw SettingNotFoundException("Set redis_address and redis_hash in world.mt to use the redis backend");
}
const char *addr = tmp.c_str();
int port = conf.exists("redis_port") ? conf.getU16("redis_port") : 6379;
ctx = redisConnect(addr, port);
if(!ctx)
throw FileNotGoodException("Cannot allocate redis context");
else if(ctx->err) {
std::string err = std::string("Connection error: ") + ctx->errstr;
redisFree(ctx);
throw FileNotGoodException(err);
}
srvmap = map;
}
int Database_Redis::Initialized(void)
{
return 1;
}
void Database_Redis::beginSave() {
redisReply *reply;
reply = (redisReply*) redisCommand(ctx, "MULTI");
if(!reply)
throw FileNotGoodException(std::string("redis command 'MULTI' failed: ") + ctx->errstr);
freeReplyObject(reply);
}
void Database_Redis::endSave() {
redisReply *reply;
reply = (redisReply*) redisCommand(ctx, "EXEC");
if(!reply)
throw FileNotGoodException(std::string("redis command 'EXEC' failed: ") + ctx->errstr);
freeReplyObject(reply);
}
bool Database_Redis::saveBlock(MapBlock *block)
{
DSTACK(__FUNCTION_NAME);
v3s16 p3d = block->getPos();
/*
Dummy blocks are not written
*/
if(block->isDummy())
{
errorstream << "WARNING: saveBlock: Not writing dummy block "
<< PP(p3d) << std::endl;
return true;
}
// Format used for writing
u8 version = SER_FMT_VER_HIGHEST_WRITE;
/*
[0] u8 serialization version
[1] data
*/
std::ostringstream o(std::ios_base::binary);
o.write((char*)&version, 1);
// Write basic data
block->serialize(o, version, true);
// Write block to database
std::string tmp1 = o.str();
std::string tmp2 = i64tos(getBlockAsInteger(p3d));
redisReply *reply = (redisReply *)redisCommand(ctx, "HSET %s %s %b",
hash.c_str(), tmp2.c_str(), tmp1.c_str(), tmp1.size());
if (!reply) {
errorstream << "WARNING: saveBlock: redis command 'HSET' failed on "
"block " << PP(p3d) << ": " << ctx->errstr << std::endl;
freeReplyObject(reply);
return false;
}
if (reply->type == REDIS_REPLY_ERROR) {
errorstream << "WARNING: saveBlock: save block " << PP(p3d)
<< "failed" << std::endl;
freeReplyObject(reply);
return false;
}
// We just wrote it to the disk so clear modified flag
block->resetModified();
freeReplyObject(reply);
return true;
}
MapBlock* Database_Redis::loadBlock(v3s16 blockpos)
{
v2s16 p2d(blockpos.X, blockpos.Z);
std::string tmp = i64tos(getBlockAsInteger(blockpos));
redisReply *reply;
reply = (redisReply*) redisCommand(ctx, "HGET %s %s", hash.c_str(), tmp.c_str());
if(!reply)
throw FileNotGoodException(std::string("redis command 'HGET %s %s' failed: ") + ctx->errstr);
if (reply->type == REDIS_REPLY_STRING && reply->len == 0) {
freeReplyObject(reply);
errorstream << "Blank block data in database (reply->len == 0) ("
<< blockpos.X << "," << blockpos.Y << "," << blockpos.Z << ")" << std::endl;
if (g_settings->getBool("ignore_world_load_errors")) {
errorstream << "Ignoring block load error. Duck and cover! "
<< "(ignore_world_load_errors)" << std::endl;
} else {
throw SerializationError("Blank block data in database");
}
return NULL;
}
if (reply->type == REDIS_REPLY_STRING) {
/*
Make sure sector is loaded
*/
MapSector *sector = srvmap->createSector(p2d);
try {
std::istringstream is(std::string(reply->str, reply->len), std::ios_base::binary);
freeReplyObject(reply); // std::string copies the memory so we can already do this here
u8 version = SER_FMT_VER_INVALID;
is.read((char *)&version, 1);
if (is.fail())
throw SerializationError("ServerMap::loadBlock(): Failed"
" to read MapBlock version");
MapBlock *block = NULL;
bool created_new = false;
block = sector->getBlockNoCreateNoEx(blockpos.Y);
if (block == NULL)
{
block = sector->createBlankBlockNoInsert(blockpos.Y);
created_new = true;
}
// Read basic data
block->deSerialize(is, version, true);
// If it's a new block, insert it to the map
if (created_new)
sector->insertBlock(block);
// We just loaded it from, so it's up-to-date.
block->resetModified();
}
catch (SerializationError &e)
{
errorstream << "Invalid block data in database"
<< " (" << blockpos.X << "," << blockpos.Y << "," << blockpos.Z
<< ") (SerializationError): " << e.what() << std::endl;
// TODO: Block should be marked as invalid in memory so that it is
// not touched but the game can run
if (g_settings->getBool("ignore_world_load_errors")) {
errorstream << "Ignoring block load error. Duck and cover! "
<< "(ignore_world_load_errors)" << std::endl;
} else {
throw SerializationError("Invalid block data in database");
}
}
return srvmap->getBlockNoCreateNoEx(blockpos); // should not be using this here
}
return NULL;
}
void Database_Redis::listAllLoadableBlocks(std::list<v3s16> &dst)
{
redisReply *reply;
reply = (redisReply*) redisCommand(ctx, "HKEYS %s", hash.c_str());
if(!reply)
throw FileNotGoodException(std::string("redis command 'HKEYS %s' failed: ") + ctx->errstr);
if(reply->type != REDIS_REPLY_ARRAY)
throw FileNotGoodException("Failed to get keys from database");
for(size_t i = 0; i < reply->elements; i++)
{
assert(reply->element[i]->type == REDIS_REPLY_STRING);
dst.push_back(getIntegerAsBlock(stoi64(reply->element[i]->str)));
}
freeReplyObject(reply);
}
Database_Redis::~Database_Redis()
{
redisFree(ctx);
}
#endif
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