forked from blue/lmdbal
194 lines
6.0 KiB
C++
194 lines
6.0 KiB
C++
// Squawk messenger.
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// Copyright (C) 2019 Yury Gubich <blue@macaw.me>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#include "database.h"
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#include "exceptions.h"
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#include "storage.h"
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LMDBDataBase::DataBase::DataBase(const QString& p_name, uint16_t mapSize):
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name(p_name.toStdString()),
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opened(false),
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size(mapSize),
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environment(),
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tables(),
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transactions(new Transactions())
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{}
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LMDBDataBase::DataBase::~DataBase() {
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close();
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delete transactions;
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for (const std::pair<const std::string, StorageBase*>& pair : tables)
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delete pair.second;
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}
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void LMDBDataBase::DataBase::close() {
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if (opened) {
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for (const std::pair<const std::string, StorageBase*>& pair : tables) {
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StorageBase* table = pair.second;
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mdb_dbi_close(environment, table->dbi);
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}
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mdb_env_close(environment);
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opened = false;
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}
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}
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void LMDBDataBase::DataBase::open() {
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if (!opened) {
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mdb_env_create(&environment);
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QString path = createDirectory();
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mdb_env_set_maxdbs(environment, tables.size());
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mdb_env_set_mapsize(environment, size * 1024UL * 1024UL);
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mdb_env_open(environment, path.toStdString().c_str(), 0, 0664);
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MDB_txn *txn;
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mdb_txn_begin(environment, NULL, 0, &txn);
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for (const std::pair<const std::string, StorageBase*>& pair : tables) {
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StorageBase* table = pair.second;
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int rc = table->createTable(txn);
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if (rc)
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throw Unknown(name, mdb_strerror(rc));
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}
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mdb_txn_commit(txn);
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opened = true;
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}
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}
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bool LMDBDataBase::DataBase::removeDirectory() {
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if (opened)
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throw Opened(name, "remove database directory");
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QString path(QStandardPaths::writableLocation(QStandardPaths::CacheLocation));
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path += "/" + getName();
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QDir cache(path);
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if (cache.exists())
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return cache.removeRecursively();
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else
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return true;
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}
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QString LMDBDataBase::DataBase::createDirectory() {
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if (opened)
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throw Opened(name, "create database directory");
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QString path(QStandardPaths::writableLocation(QStandardPaths::CacheLocation));
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path += "/" + getName();
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QDir cache(path);
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if (!cache.exists()) {
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bool res = cache.mkpath(path);
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if (!res)
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throw Directory(path.toStdString());
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}
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return path;
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}
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QString LMDBDataBase::DataBase::getName() const {
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return QString::fromStdString(name);}
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bool LMDBDataBase::DataBase::ready() const {
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return opened;}
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void LMDBDataBase::DataBase::drop() {
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if (!opened)
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throw Closed("drop", name);
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MDB_txn *txn;
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int rc = mdb_txn_begin(environment, NULL, 0, &txn);
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if (rc)
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throw Unknown(name, mdb_strerror(rc));
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for (const std::pair<const std::string, StorageBase*>& pair : tables) {
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rc = pair.second->drop(txn);
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if (rc)
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throw Unknown(name, mdb_strerror(rc), pair.first);
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}
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mdb_txn_commit(txn);
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}
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LMDBDataBase::TransactionID LMDBDataBase::DataBase::beginReadOnlyTransaction() const {
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return beginReadOnlyTransaction(emptyName);}
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LMDBDataBase::TransactionID LMDBDataBase::DataBase::beginTransaction() const {
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return beginTransaction(emptyName);}
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void LMDBDataBase::DataBase::abortTransaction(LMDBDataBase::TransactionID id) const {
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return abortTransaction(id, emptyName);}
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void LMDBDataBase::DataBase::commitTransaction(LMDBDataBase::TransactionID id) const {
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return commitTransaction(id, emptyName);}
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LMDBDataBase::TransactionID LMDBDataBase::DataBase::beginReadOnlyTransaction(const std::string& storageName) const {
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if (!opened)
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throw Closed("beginReadOnlyTransaction", name, storageName);
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MDB_txn* txn;
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int rc = mdb_txn_begin(environment, NULL, MDB_RDONLY, &txn);
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if (rc) {
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mdb_txn_abort(txn);
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throw Unknown(name, mdb_strerror(rc), storageName);
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}
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transactions->emplace(txn);
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return txn;
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}
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LMDBDataBase::TransactionID LMDBDataBase::DataBase::beginTransaction(const std::string& storageName) const {
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if (!opened)
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throw Closed("beginTransaction", name, storageName);
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MDB_txn* txn;
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int rc = mdb_txn_begin(environment, NULL, 0, &txn);
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if (rc) {
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mdb_txn_abort(txn);
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throw Unknown(name, mdb_strerror(rc), storageName);
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}
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transactions->emplace(txn);
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return txn;
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}
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void LMDBDataBase::DataBase::abortTransaction(LMDBDataBase::TransactionID id, const std::string& storageName) const {
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if (!opened)
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throw Closed("abortTransaction", name, storageName);
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Transactions::iterator itr = transactions->find(id);
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if (itr == transactions->end()) //TODO may be it's a good idea to make an exception class for this
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throw Unknown(name, "unable to abort transaction: transaction was not found", storageName);
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mdb_txn_abort(id);
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transactions->erase(itr);
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}
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void LMDBDataBase::DataBase::commitTransaction(LMDBDataBase::TransactionID id, const std::string& storageName) const {
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if (!opened)
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throw Closed("abortTransaction", name, storageName);
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Transactions::iterator itr = transactions->find(id);
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if (itr == transactions->end()) //TODO may be it's a good idea to make an exception class for this
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throw Unknown(name, "unable to commit transaction: transaction was not found", storageName);
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int rc = mdb_txn_commit(id);
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transactions->erase(itr);
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if (rc != MDB_SUCCESS)
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throw Unknown(name, mdb_strerror(rc), storageName);
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}
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