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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
#include "database-redis.h"
#include "settings.h"
#include "log.h"
#include "exceptions.h"
#include "util/string.h"
#include <hiredis.h>
#include <cassert>
Database_Redis::Database_Redis(Settings &conf)
{
std::string tmp;
try {
tmp = conf.get("redis_address");
hash = conf.get("redis_hash");
} catch (SettingNotFoundException) {
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;
// if redis_address contains '/' assume unix socket, else hostname/ip
ctx = tmp.find('/') != std::string::npos ? redisConnectUnix(addr) : redisConnect(addr, port);
if (!ctx) {
throw DatabaseException("Cannot allocate redis context");
} else if (ctx->err) {
std::string err = std::string("Connection error: ") + ctx->errstr;
redisFree(ctx);
throw DatabaseException(err);
}
}
Database_Redis::~Database_Redis()
{
redisFree(ctx);
}
void Database_Redis::beginSave() {
redisReply *reply = static_cast<redisReply *>(redisCommand(ctx, "MULTI"));
if (!reply) {
throw DatabaseException(std::string(
"Redis command 'MULTI' failed: ") + ctx->errstr);
}
freeReplyObject(reply);
}
void Database_Redis::endSave() {
redisReply *reply = static_cast<redisReply *>(redisCommand(ctx, "EXEC"));
if (!reply) {
throw DatabaseException(std::string(
"Redis command 'EXEC' failed: ") + ctx->errstr);
}
freeReplyObject(reply);
}
bool Database_Redis::saveBlock(const v3s16 &pos, const std::string &data)
{
std::string tmp = i64tos(getBlockAsInteger(pos));
redisReply *reply = static_cast<redisReply *>(redisCommand(ctx, "HSET %s %s %b",
hash.c_str(), tmp.c_str(), data.c_str(), data.size()));
if (!reply) {
warningstream << "saveBlock: redis command 'HSET' failed on "
"block " << PP(pos) << ": " << ctx->errstr << std::endl;
freeReplyObject(reply);
return false;
}
if (reply->type == REDIS_REPLY_ERROR) {
warningstream << "saveBlock: saving block " << PP(pos)
<< " failed: " << std::string(reply->str, reply->len) << std::endl;
freeReplyObject(reply);
return false;
}
freeReplyObject(reply);
return true;
}
void Database_Redis::loadBlock(const v3s16 &pos, std::string *block)
{
std::string tmp = i64tos(getBlockAsInteger(pos));
redisReply *reply = static_cast<redisReply *>(redisCommand(ctx,
"HGET %s %s", hash.c_str(), tmp.c_str()));
if (!reply) {
throw DatabaseException(std::string(
"Redis command 'HGET %s %s' failed: ") + ctx->errstr);
}
switch (reply->type) {
case REDIS_REPLY_STRING: {
*block = std::string(reply->str, reply->len);
// std::string copies the memory so this won't cause any problems
freeReplyObject(reply);
return;
}
case REDIS_REPLY_ERROR: {
std::string errstr(reply->str, reply->len);
freeReplyObject(reply);
errorstream << "loadBlock: loading block " << PP(pos)
<< " failed: " << errstr << std::endl;
throw DatabaseException(std::string(
"Redis command 'HGET %s %s' errored: ") + errstr);
}
case REDIS_REPLY_NIL: {
*block = "";
// block not found in database
freeReplyObject(reply);
return;
}
}
errorstream << "loadBlock: loading block " << PP(pos)
<< " returned invalid reply type " << reply->type
<< ": " << std::string(reply->str, reply->len) << std::endl;
freeReplyObject(reply);
throw DatabaseException(std::string(
"Redis command 'HGET %s %s' gave invalid reply."));
}
bool Database_Redis::deleteBlock(const v3s16 &pos)
{
std::string tmp = i64tos(getBlockAsInteger(pos));
redisReply *reply = static_cast<redisReply *>(redisCommand(ctx,
"HDEL %s %s", hash.c_str(), tmp.c_str()));
if (!reply) {
throw DatabaseException(std::string(
"Redis command 'HDEL %s %s' failed: ") + ctx->errstr);
} else if (reply->type == REDIS_REPLY_ERROR) {
warningstream << "deleteBlock: deleting block " << PP(pos)
<< " failed: " << std::string(reply->str, reply->len) << std::endl;
freeReplyObject(reply);
return false;
}
freeReplyObject(reply);
return true;
}
void Database_Redis::listAllLoadableBlocks(std::vector<v3s16> &dst)
{
redisReply *reply = static_cast<redisReply *>(redisCommand(ctx, "HKEYS %s", hash.c_str()));
if (!reply) {
throw DatabaseException(std::string(
"Redis command 'HKEYS %s' failed: ") + ctx->errstr);
}
switch (reply->type) {
case REDIS_REPLY_ARRAY:
dst.reserve(reply->elements);
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)));
}
break;
case REDIS_REPLY_ERROR:
throw DatabaseException(std::string(
"Failed to get keys from database: ") +
std::string(reply->str, reply->len));
}
freeReplyObject(reply);
}
#endif // USE_REDIS
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