294 lines
8.3 KiB
C++
294 lines
8.3 KiB
C++
/*
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* LMDB Abstraction Layer.
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* Copyright (C) 2023 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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*/
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#ifndef LMDBAL_STORAGE_HPP
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#define LMDBAL_STORAGE_HPP
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#include "storage.h"
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#include "exceptions.h"
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template<class K, class V>
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LMDBAL::Storage<K, V>::Storage(const std::string& p_name, Base* parent):
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iStorage(p_name, parent),
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keySerializer(new Serializer<K>()),
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valueSerializer(new Serializer<V>())
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{}
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template<class K, class V>
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LMDBAL::Storage<K, V>::~Storage() {
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delete valueSerializer;
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delete keySerializer;
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}
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template<class K, class V>
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void LMDBAL::Storage<K, V>::addRecord(const K& key, const V& value) {
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ensureOpened(addRecordMethodName);
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TransactionID txn = beginTransaction();
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MDB_val lmdbKey = keySerializer->setData(key);
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MDB_val lmdbData = valueSerializer->setData(value);
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int rc = mdb_put(txn, dbi, &lmdbKey, &lmdbData, MDB_NOOVERWRITE);
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if (rc != MDB_SUCCESS)
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throwDuplicateOrUnknown(rc, txn, toString(key));
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commitTransaction(txn);
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}
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template<class K, class V>
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bool LMDBAL::Storage<K, V>::forceRecord(const K& key, const V& value) {
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ensureOpened(forceRecordMethodName);
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bool added;
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TransactionID txn = beginTransaction();
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MDB_val lmdbKey = keySerializer->setData(key);
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MDB_val lmdbData;
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int rc = mdb_get(txn, dbi, &lmdbKey, &lmdbData);
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switch (rc) {
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case MDB_SUCCESS:
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added = false;
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break;
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case MDB_NOTFOUND:
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added = true;
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break;
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default:
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added = false;
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throwUnknown(rc, txn);
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}
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lmdbData = valueSerializer->setData(value);
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rc = mdb_put(txn, dbi, &lmdbKey, &lmdbData, 0);
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if (rc != MDB_SUCCESS)
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throwUnknown(rc, txn);
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commitTransaction(txn);
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return added;
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}
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template<class K, class V>
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void LMDBAL::Storage<K, V>::changeRecord(const K& key, const V& value) {
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ensureOpened(changeRecordMethodName);
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TransactionID txn = beginTransaction();
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MDB_val lmdbKey = keySerializer->setData(key);
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MDB_val lmdbData = valueSerializer->setData(value);
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int rc = mdb_put(txn, dbi, &lmdbKey, &lmdbData, 0);
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if (rc != MDB_SUCCESS)
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throwUnknown(rc, txn);
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commitTransaction(txn);
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}
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template<class K, class V>
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V LMDBAL::Storage<K, V>::getRecord(const K& key) const {
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ensureOpened(getRecordMethodName);
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TransactionID txn = beginReadOnlyTransaction();
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MDB_val lmdbKey = keySerializer->setData(key);
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MDB_val lmdbData;
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int rc = mdb_get(txn, dbi, &lmdbKey, &lmdbData);
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if (rc != MDB_SUCCESS)
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throwNotFoundOrUnknown(rc, txn, toString(key));
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V value = valueSerializer->deserialize(lmdbData);
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abortTransaction(txn);
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return value;
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}
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template<class K, class V>
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bool LMDBAL::Storage<K, V>::checkRecord(const K& key) const {
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ensureOpened(checkRecordMethodName);
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TransactionID txn = beginReadOnlyTransaction();
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MDB_val lmdbKey = keySerializer->setData(key);
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MDB_val lmdbData;
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int rc = mdb_get(txn, dbi, &lmdbKey, &lmdbData);
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abortTransaction(txn);
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if (rc == MDB_SUCCESS)
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return true;
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if (rc != MDB_NOTFOUND)
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throwUnknown(rc);
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return false;
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}
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template<class K, class V>
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std::map<K, V> LMDBAL::Storage<K, V>::readAll() const {
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ensureOpened(readAllMethodName);
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TransactionID txn = beginReadOnlyTransaction();
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std::map<K, V> result;
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MDB_cursor* cursor;
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MDB_val lmdbKey, lmdbData;
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int rc = mdb_cursor_open(txn, dbi, &cursor);
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if (rc != MDB_SUCCESS)
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throwUnknown(rc, txn);
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rc = mdb_cursor_get(cursor, &lmdbKey, &lmdbData, MDB_FIRST);
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while (rc == MDB_SUCCESS) {
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K key = keySerializer->deserialize(lmdbKey);
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V value = valueSerializer->deserialize(lmdbData);
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result.insert(std::make_pair(key, value));
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rc = mdb_cursor_get(cursor, &lmdbKey, &lmdbData, MDB_NEXT);
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}
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abortTransaction(txn);
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if (rc != MDB_NOTFOUND)
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throwUnknown(rc);
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return result;
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}
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template<class K, class V>
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void LMDBAL::Storage<K, V>::replaceAll(const std::map<K, V>& data) {
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ensureOpened(replaceAllMethodName);
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TransactionID txn = beginTransaction();
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int rc = drop(txn);
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if (rc != MDB_SUCCESS)
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throwUnknown(rc, txn);
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MDB_val lmdbKey, lmdbData;
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for (const std::pair<const K, V>& pair : data) {
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lmdbKey = keySerializer->setData(pair.first);
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lmdbData = valueSerializer->setData(pair.second);
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rc = mdb_put(txn, dbi, &lmdbKey, &lmdbData, MDB_NOOVERWRITE);
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if (rc != MDB_SUCCESS)
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throwUnknown(rc, txn);
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}
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commitTransaction(txn);
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}
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template<class K, class V>
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uint32_t LMDBAL::Storage<K, V>::addRecords(const std::map<K, V>& data, bool overwrite) {
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ensureOpened(addRecordsMethodName);
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TransactionID txn = beginTransaction();
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MDB_val lmdbKey, lmdbData;
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int rc;
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for (const std::pair<const K, V>& pair : data) {
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lmdbKey = keySerializer->setData(pair.first);
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lmdbData = valueSerializer->setData(pair.second);
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rc = mdb_put(txn, dbi, &lmdbKey, &lmdbData, overwrite ? 0 : MDB_NOOVERWRITE);
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if (rc != MDB_SUCCESS)
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throwUnknown(rc, txn);
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}
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MDB_stat stat;
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rc = mdb_stat(txn, dbi, &stat);
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if (rc != MDB_SUCCESS)
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throwUnknown(rc, txn);
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uint32_t amount = stat.ms_entries;
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commitTransaction(txn);
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return amount;
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}
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template<class K, class V>
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void LMDBAL::Storage<K, V>::removeRecord(const K& key) {
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ensureOpened(removeRecordMethodName);
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TransactionID txn = beginTransaction();
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MDB_val lmdbKey = keySerializer->setData(key);
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int rc = mdb_del(txn, dbi, &lmdbKey, NULL);
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if (rc != MDB_SUCCESS)
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throwNotFoundOrUnknown(rc, txn, toString(key));
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commitTransaction(txn);
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}
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template<class K, class V>
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int LMDBAL::Storage<K, V>::createTable(MDB_txn* transaction) {
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return makeTable<K>(transaction);
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}
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template<class K>
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inline int LMDBAL::iStorage::makeTable(MDB_txn* transaction) {
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return mdb_dbi_open(transaction, name.c_str(), MDB_CREATE, &dbi);
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}
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template<>
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inline int LMDBAL::iStorage::makeTable<uint64_t>(MDB_txn* transaction) {
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return mdb_dbi_open(transaction, name.c_str(), MDB_CREATE | MDB_INTEGERKEY, &dbi);
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}
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template<>
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inline int LMDBAL::iStorage::makeTable<uint32_t>(MDB_txn* transaction) {
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return mdb_dbi_open(transaction, name.c_str(), MDB_CREATE | MDB_INTEGERKEY, &dbi);
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}
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template<>
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inline int LMDBAL::iStorage::makeTable<uint16_t>(MDB_txn* transaction) {
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return mdb_dbi_open(transaction, name.c_str(), MDB_CREATE | MDB_INTEGERKEY, &dbi);
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}
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template<>
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inline int LMDBAL::iStorage::makeTable<uint8_t>(MDB_txn* transaction) {
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return mdb_dbi_open(transaction, name.c_str(), MDB_CREATE | MDB_INTEGERKEY, &dbi);
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}
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template<>
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inline int LMDBAL::iStorage::makeTable<int64_t>(MDB_txn* transaction) {
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return mdb_dbi_open(transaction, name.c_str(), MDB_CREATE | MDB_INTEGERKEY, &dbi);
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}
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template<>
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inline int LMDBAL::iStorage::makeTable<int32_t>(MDB_txn* transaction) {
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return mdb_dbi_open(transaction, name.c_str(), MDB_CREATE | MDB_INTEGERKEY, &dbi);
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}
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template<>
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inline int LMDBAL::iStorage::makeTable<int16_t>(MDB_txn* transaction) {
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return mdb_dbi_open(transaction, name.c_str(), MDB_CREATE | MDB_INTEGERKEY, &dbi);
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}
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template<>
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inline int LMDBAL::iStorage::makeTable<int8_t>(MDB_txn* transaction) {
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return mdb_dbi_open(transaction, name.c_str(), MDB_CREATE | MDB_INTEGERKEY, &dbi);
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}
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template<class T>
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inline std::string LMDBAL::iStorage::toString(const T& value) {
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return std::to_string(value);
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}
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template<>
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inline std::string LMDBAL::iStorage::toString(const QString& value) {
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return value.toStdString();
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}
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template<>
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inline std::string LMDBAL::iStorage::toString(const std::string& value) {
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return value;
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}
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#endif //LMDBAL_STORAGE_HPP
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