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/*
Minetest
Copyright (C) 2013 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.
*/
/*
SQLite format specification:
blocks:
(PK) INT id
BLOB data
*/
#include "database-sqlite3.h"
#include "log.h"
#include "filesys.h"
#include "exceptions.h"
#include "settings.h"
#include "util/string.h"
#include <cassert>
#define SQLRES(s, r) \
if ((s) != (r)) { \
throw FileNotGoodException(std::string(\
"SQLite3 database error (" \
__FILE__ ":" TOSTRING(__LINE__) \
"): ") +\
sqlite3_errmsg(m_database)); \
}
#define SQLOK(s) SQLRES(s, SQLITE_OK)
#define PREPARE_STATEMENT(name, query) \
SQLOK(sqlite3_prepare_v2(m_database, query, -1, &m_stmt_##name, NULL))
#define FINALIZE_STATEMENT(statement) \
if (sqlite3_finalize(statement) != SQLITE_OK) { \
throw FileNotGoodException(std::string( \
"SQLite3: Failed to finalize " #statement ": ") + \
sqlite3_errmsg(m_database)); \
}
Database_SQLite3::Database_SQLite3(const std::string &savedir) :
m_initialized(false),
m_savedir(savedir),
m_database(NULL),
m_stmt_read(NULL),
m_stmt_write(NULL),
m_stmt_list(NULL),
m_stmt_delete(NULL)
{
}
void Database_SQLite3::beginSave() {
verifyDatabase();
SQLRES(sqlite3_step(m_stmt_begin), SQLITE_DONE);
sqlite3_reset(m_stmt_begin);
}
void Database_SQLite3::endSave() {
verifyDatabase();
SQLRES(sqlite3_step(m_stmt_end), SQLITE_DONE);
sqlite3_reset(m_stmt_end);
}
void Database_SQLite3::openDatabase()
{
if (m_database) return;
std::string dbp = m_savedir + DIR_DELIM + "map.sqlite";
// Open the database connection
if (!fs::CreateAllDirs(m_savedir)) {
infostream << "Database_SQLite3: Failed to create directory \""
<< m_savedir << "\"" << std::endl;
throw FileNotGoodException("Failed to create database "
"save directory");
}
bool needs_create = !fs::PathExists(dbp);
if (sqlite3_open_v2(dbp.c_str(), &m_database,
SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE,
NULL) != SQLITE_OK) {
errorstream << "SQLite3 database failed to open: "
<< sqlite3_errmsg(m_database) << std::endl;
throw FileNotGoodException("Cannot open database file");
}
if (needs_create) {
createDatabase();
}
std::string query_str = std::string("PRAGMA synchronous = ")
+ itos(g_settings->getU16("sqlite_synchronous"));
SQLOK(sqlite3_exec(m_database, query_str.c_str(), NULL, NULL, NULL));
}
void Database_SQLite3::verifyDatabase()
{
if (m_initialized) return;
openDatabase();
PREPARE_STATEMENT(begin, "BEGIN");
PREPARE_STATEMENT(end, "COMMIT");
PREPARE_STATEMENT(read, "SELECT `data` FROM `blocks` WHERE `pos` = ? LIMIT 1");
#ifdef __ANDROID__
PREPARE_STATEMENT(write, "INSERT INTO `blocks` (`pos`, `data`) VALUES (?, ?)");
#else
PREPARE_STATEMENT(write, "REPLACE INTO `blocks` (`pos`, `data`) VALUES (?, ?)");
#endif
PREPARE_STATEMENT(delete, "DELETE FROM `blocks` WHERE `pos` = ?");
PREPARE_STATEMENT(list, "SELECT `pos` FROM `blocks`");
m_initialized = true;
verbosestream << "ServerMap: SQLite3 database opened." << std::endl;
}
inline void Database_SQLite3::bindPos(sqlite3_stmt *stmt, const v3s16 &pos, int index)
{
SQLOK(sqlite3_bind_int64(stmt, index, getBlockAsInteger(pos)));
}
bool Database_SQLite3::deleteBlock(const v3s16 &pos)
{
verifyDatabase();
bindPos(m_stmt_delete, pos);
bool good = sqlite3_step(m_stmt_delete) == SQLITE_DONE;
sqlite3_reset(m_stmt_delete);
if (!good) {
errorstream << "WARNING: deleteBlock: Block failed to delete "
<< PP(pos) << ": " << sqlite3_errmsg(m_database) << std::endl;
}
return good;
}
bool Database_SQLite3::saveBlock(const v3s16 &pos, const std::string &data)
{
verifyDatabase();
#ifdef __ANDROID__
/**
* Note: For some unknown reason SQLite3 fails to REPLACE blocks on Android,
* deleting them and then inserting works.
*/
bindPos(m_stmt_read, pos);
if (sqlite3_step(m_stmt_read) == SQLITE_ROW) {
deleteBlock(pos);
}
sqlite3_reset(m_stmt_read);
#endif
bindPos(m_stmt_write, pos);
SQLOK(sqlite3_bind_blob(m_stmt_write, 2, data.data(), data.size(), NULL));
SQLRES(sqlite3_step(m_stmt_write), SQLITE_DONE)
sqlite3_reset(m_stmt_write);
return true;
}
std::string Database_SQLite3::loadBlock(const v3s16 &pos)
{
verifyDatabase();
bindPos(m_stmt_read, pos);
if (sqlite3_step(m_stmt_read) != SQLITE_ROW) {
sqlite3_reset(m_stmt_read);
return "";
}
const char *data = (const char *) sqlite3_column_blob(m_stmt_read, 0);
size_t len = sqlite3_column_bytes(m_stmt_read, 0);
std::string s;
if (data)
s = std::string(data, len);
sqlite3_step(m_stmt_read);
// We should never get more than 1 row, so ok to reset
sqlite3_reset(m_stmt_read);
return s;
}
void Database_SQLite3::createDatabase()
{
assert(m_database); // Pre-condition
SQLOK(sqlite3_exec(m_database,
"CREATE TABLE IF NOT EXISTS `blocks` (\n"
" `pos` INT PRIMARY KEY,\n"
" `data` BLOB\n"
");\n",
NULL, NULL, NULL));
}
void Database_SQLite3::listAllLoadableBlocks(std::vector<v3s16> &dst)
{
verifyDatabase();
while (sqlite3_step(m_stmt_list) == SQLITE_ROW) {
dst.push_back(getIntegerAsBlock(sqlite3_column_int64(m_stmt_list, 0)));
}
sqlite3_reset(m_stmt_list);
}
Database_SQLite3::~Database_SQLite3()
{
FINALIZE_STATEMENT(m_stmt_read)
FINALIZE_STATEMENT(m_stmt_write)
FINALIZE_STATEMENT(m_stmt_list)
FINALIZE_STATEMENT(m_stmt_begin)
FINALIZE_STATEMENT(m_stmt_end)
FINALIZE_STATEMENT(m_stmt_delete)
if (sqlite3_close(m_database) != SQLITE_OK) {
errorstream << "Database_SQLite3::~Database_SQLite3(): "
<< "Failed to close database: "
<< sqlite3_errmsg(m_database) << std::endl;
}
}
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