lmdbal/database.cpp

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// Squawk messenger.
// Copyright (C) 2019 Yury Gubich <blue@macaw.me>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
#include "database.h"
#include "exceptions.h"
#include "table.h"
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DataBase::DataBase(const QString& p_name, uint16_t mapSize):
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name(p_name.toStdString()),
opened(false),
size(mapSize),
environment(),
tables()
{
}
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DataBase::~DataBase()
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{
close();
for (const std::pair<const std::string, _Table*>& pair : tables) {
delete pair.second;
}
}
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void DataBase::close()
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{
if (opened) {
for (const std::pair<const std::string, _Table*>& pair : tables) {
_Table* table = pair.second;
mdb_dbi_close(environment, table->dbi);
}
mdb_env_close(environment);
opened = false;
}
}
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void DataBase::open()
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{
if (!opened) {
mdb_env_create(&environment);
QString path = createDirectory();
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mdb_env_set_maxdbs(environment, tables.size());
mdb_env_set_mapsize(environment, size * 1024UL * 1024UL);
mdb_env_open(environment, path.toStdString().c_str(), 0, 0664);
MDB_txn *txn;
mdb_txn_begin(environment, NULL, 0, &txn);
for (const std::pair<const std::string, _Table*>& pair : tables) {
_Table* table = pair.second;
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int rc = table->createTable(txn);
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if (rc) {
throw Unknown(name, mdb_strerror(rc));
}
}
mdb_txn_commit(txn);
opened = true;
}
}
bool DataBase::removeDirectory()
{
if (opened) {
throw Opened(name, "remove database directory");
}
QString path(QStandardPaths::writableLocation(QStandardPaths::CacheLocation));
path += "/" + getName();
QDir cache(path);
if (cache.exists()) {
return cache.removeRecursively();
} else {
return true;
}
}
QString DataBase::createDirectory()
{
if (opened) {
throw Opened(name, "create database directory");
}
QString path(QStandardPaths::writableLocation(QStandardPaths::CacheLocation));
path += "/" + getName();
QDir cache(path);
if (!cache.exists()) {
bool res = cache.mkpath(path);
if (!res) {
throw Directory(path.toStdString());
}
}
return path;
}
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QString DataBase::getName() const
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{
return QString::fromStdString(name);
}
bool DataBase::ready() const
{
return opened;
}
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void DataBase::drop()
{
if (!opened) {
throw Closed("drop", name);
}
MDB_txn *txn;
int rc = mdb_txn_begin(environment, NULL, 0, &txn);
if (rc) {
throw Unknown(name, mdb_strerror(rc));
}
for (const std::pair<const std::string, _Table*>& pair : tables) {
rc = pair.second->drop(txn);
if (rc) {
throw Unknown(name, mdb_strerror(rc), pair.first);
}
}
mdb_txn_commit(txn);
}