377 lines
12 KiB
C++
377 lines
12 KiB
C++
/*
|
|
* LMDB Abstraction Layer.
|
|
* Copyright (C) 2023 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 "storage.h"
|
|
|
|
#define UNUSED(x) (void)(x)
|
|
|
|
/**
|
|
* \class LMDBAL::iStorage
|
|
*
|
|
* This is a interface-like class, it's designed to be an inner database interface to
|
|
* be used as a polymorphic entity, and provide protected interaction with the database
|
|
* from the heirs code
|
|
*/
|
|
|
|
/**
|
|
* \brief Constructs a storage interface
|
|
*/
|
|
LMDBAL::iStorage::iStorage(const std::string& p_name, Base* parent):
|
|
dbi(),
|
|
db(parent),
|
|
name(p_name)
|
|
{}
|
|
|
|
/**
|
|
* \brief Destroys a storage interface
|
|
*/
|
|
LMDBAL::iStorage::~iStorage() {}
|
|
|
|
/**
|
|
* \brief A private virtual function I need to close each storage in the database
|
|
*/
|
|
void LMDBAL::iStorage::close() {
|
|
mdb_dbi_close(db->environment, dbi);
|
|
}
|
|
|
|
|
|
/**
|
|
* \brief Drops content of a storage interface
|
|
*
|
|
* Designed to drop storage content
|
|
*
|
|
* \exception LMDBAL::Closed thrown if the database was closed
|
|
* \exception LMDBAL::Unknown thrown if something unexpected happened
|
|
*/
|
|
void LMDBAL::iStorage::drop() {
|
|
ensureOpened(dropMethodName);
|
|
|
|
TransactionID txn = db->beginTransaction();
|
|
int rc = iStorage::drop(txn);
|
|
if (rc != MDB_SUCCESS) {
|
|
abortTransaction(txn);
|
|
throw Unknown(db->name, mdb_strerror(rc), name);
|
|
}
|
|
|
|
db->commitTransaction(txn);
|
|
}
|
|
|
|
/**
|
|
* \brief Drops content of a storage interface (transaction variant)
|
|
*
|
|
* Just performs content drop
|
|
*
|
|
* \param[in] transaction - transaction ID, must be writable transaction!
|
|
* \returns MDB_SUCCESS if everything went fine, MDB_<error> code otherwise
|
|
*/
|
|
int LMDBAL::iStorage::drop(TransactionID transaction) {
|
|
return mdb_drop(transaction, dbi, 0);
|
|
}
|
|
|
|
/**
|
|
* \brief Helper function, thows exception if the database is not opened
|
|
*
|
|
* \param[in] methodName - name of the method this function is called from, just for display in std::exception::what() message
|
|
*
|
|
* \exception LMDBAL::Closed thrown if the database was closed
|
|
*/
|
|
void LMDBAL::iStorage::ensureOpened(const std::string& methodName) const {
|
|
if (!isDBOpened())
|
|
throw Closed(methodName, db->name, name);
|
|
}
|
|
|
|
/**
|
|
* \brief Storage size
|
|
*
|
|
* \returns amount of records in the storage
|
|
*
|
|
* \exception LMDBAL::Closed thrown if the database was closed
|
|
* \exception LMDBAL::Unknown thrown if something unexpected happened
|
|
*/
|
|
LMDBAL::SizeType LMDBAL::iStorage::count() const {
|
|
ensureOpened(countMethodName);
|
|
|
|
TransactionID txn = beginReadOnlyTransaction();
|
|
SizeType amount;
|
|
try {
|
|
amount = count(txn);
|
|
} catch (...) {
|
|
abortTransaction(txn);
|
|
throw;
|
|
}
|
|
abortTransaction(txn);
|
|
|
|
return amount;
|
|
}
|
|
|
|
/**
|
|
* \brief Storage size (transaction variant)
|
|
*
|
|
* \param[in] txn - transaction ID, can be read-only transaction
|
|
* \returns amount of records in the storage
|
|
*
|
|
* \exception LMDBAL::Unknown thrown if something unexpected happened
|
|
*/
|
|
LMDBAL::SizeType LMDBAL::iStorage::count(TransactionID txn) const {
|
|
MDB_stat stat;
|
|
int rc = mdb_stat(txn, dbi, &stat);
|
|
if (rc != MDB_SUCCESS)
|
|
throw Unknown(db->name, mdb_strerror(rc), name);
|
|
|
|
return stat.ms_entries;
|
|
}
|
|
|
|
/**
|
|
* \brief Throws LMDBAL::Exist or LMDBAL::Unknown (transaction vairiant)
|
|
*
|
|
* Helper function ment to be used in heirs and reduce the code a bit
|
|
*
|
|
* \param[in] rc - result of lmdb low level operation
|
|
* \param[in] txn - transaction ID to be aborted, any transaction
|
|
* \param[in] key - requested key string representation, just to show in std::exception::what() message
|
|
*
|
|
* \exception LMDBAL::Exist thrown if rc == MDB_KEYEXIST
|
|
* \exception LMDBAL::Unknown thrown if rc != MDB_KEYEXIST
|
|
*/
|
|
void LMDBAL::iStorage::throwDuplicateOrUnknown(int rc, TransactionID txn, const std::string& key) const {
|
|
abortTransaction(txn);
|
|
throwDuplicateOrUnknown(rc, key);
|
|
}
|
|
|
|
/**
|
|
* \brief Throws LMDBAL::NotFound or LMDBAL::Unknown (transaction vairiant)
|
|
*
|
|
* Helper function ment to be used in heirs and reduce the code a bit
|
|
*
|
|
* \param[in] rc - result of lmdb low level operation
|
|
* \param[in] txn - transaction ID to be aborted, any transaction
|
|
* \param[in] key - requested key string representation, just to show in std::exception::what() message
|
|
*
|
|
* \exception LMDBAL::NotFound thrown if rc == MDB_NOTFOUND
|
|
* \exception LMDBAL::Unknown thrown if rc != MDB_NOTFOUND
|
|
*/
|
|
void LMDBAL::iStorage::throwNotFoundOrUnknown(int rc, LMDBAL::TransactionID txn, const std::string& key) const {
|
|
abortTransaction(txn);
|
|
throwNotFoundOrUnknown(rc, key);
|
|
}
|
|
|
|
/**
|
|
* \brief Throws LMDBAL::Exist or LMDBAL::Unknown
|
|
*
|
|
* Helper function ment to be used in heirs and reduce the code a bit
|
|
*
|
|
* \param[in] rc - result of lmdb low level operation
|
|
* \param[in] key - requested key string representation, just to show in std::exception::what() message
|
|
*
|
|
* \exception LMDBAL::Exist thrown if rc == MDB_KEYEXIST
|
|
* \exception LMDBAL::Unknown thrown if rc != MDB_KEYEXIST
|
|
*/
|
|
void LMDBAL::iStorage::throwDuplicateOrUnknown(int rc, const std::string& key) const {
|
|
if (rc == MDB_KEYEXIST)
|
|
throwDuplicate(key);
|
|
else
|
|
throwUnknown(rc);
|
|
}
|
|
|
|
/**
|
|
* \brief Throws LMDBAL::NotFound or LMDBAL::Unknown (transaction variant)
|
|
*
|
|
* Helper function ment to be used in heirs and reduce the code a bit
|
|
*
|
|
* \param[in] rc - result of lmdb low level operation
|
|
* \param[in] key - requested key string representation, just to show in std::exception::what() message
|
|
*
|
|
* \exception LMDBAL::NotFound thrown if rc == MDB_NOTFOUND
|
|
* \exception LMDBAL::Unknown thrown if rc != MDB_NOTFOUND
|
|
*/
|
|
void LMDBAL::iStorage::throwNotFoundOrUnknown(int rc, const std::string& key) const {
|
|
if (rc == MDB_NOTFOUND)
|
|
throwNotFound(key);
|
|
else
|
|
throwUnknown(rc);
|
|
}
|
|
|
|
/**
|
|
* \brief Throws LMDBAL::Unknown (transaction vairiant)
|
|
*
|
|
* Helper function ment to be used in heirs and reduce the code a bit
|
|
*
|
|
* \param[in] rc - result of lmdb low level operation
|
|
* \param[in] txn - transaction ID to be aborted, any transaction
|
|
*
|
|
* \exception LMDBAL::Unknown thrown everytime
|
|
*/
|
|
void LMDBAL::iStorage::throwUnknown(int rc, LMDBAL::TransactionID txn) const {
|
|
abortTransaction(txn);
|
|
throwUnknown(rc);
|
|
}
|
|
|
|
/**
|
|
* \brief Database name
|
|
*
|
|
* Ment to be used in heirs, to provide some sort of interface to acces to some of the database information
|
|
*
|
|
* \returns database name
|
|
*/
|
|
const std::string & LMDBAL::iStorage::dbName() const {
|
|
return db->name;}
|
|
|
|
/**
|
|
* \brief Is database opened
|
|
*
|
|
* Ment to be used in heirs, to provide some sort of interface to acces to some of the database information
|
|
*
|
|
* \returns true if database is ipened, false otherwise
|
|
*/
|
|
bool LMDBAL::iStorage::isDBOpened() const {
|
|
return db->opened;}
|
|
|
|
/**
|
|
* \brief Throws LMDBAL::Unknown
|
|
*
|
|
* Helper function ment to be used in heirs and reduce the code a bit
|
|
*
|
|
* \param[in] rc - result of lmdb low level operation
|
|
*
|
|
* \exception LMDBAL::Unknown thrown everytime
|
|
*/
|
|
void LMDBAL::iStorage::throwUnknown(int rc) const {
|
|
throw Unknown(db->name, mdb_strerror(rc), name);}
|
|
|
|
/**
|
|
* \brief Throws LMDBAL::Exist
|
|
*
|
|
* Helper function ment to be used in heirs and reduce the code a bit
|
|
*
|
|
* \param[in] key - requested key string representation, just to show in std::exception::what() message
|
|
*
|
|
* \exception LMDBAL::Exist thrown everytime
|
|
*/
|
|
void LMDBAL::iStorage::throwDuplicate(const std::string& key) const {
|
|
throw Exist(key, db->name, name);}
|
|
|
|
/**
|
|
* \brief Throws LMDBAL::NotFound
|
|
*
|
|
* Helper function ment to be used in heirs and reduce the code a bit
|
|
*
|
|
* \param[in] key - requested key string representation, just to show in std::exception::what() message
|
|
*
|
|
* \exception LMDBAL::NotFound thrown everytime
|
|
*/
|
|
void LMDBAL::iStorage::throwNotFound(const std::string& key) const {
|
|
throw NotFound(key, db->name, name);}
|
|
|
|
/**
|
|
* \brief Throws LMDBAL::CursorNotReady
|
|
*
|
|
* Helper function ment to be used in heirs and reduce the code a bit
|
|
*
|
|
* \param[in] method - called cursor method name, just to show in std::exception::what() message
|
|
*
|
|
* \exception LMDBAL::CursorNotReady thrown everytime
|
|
*/
|
|
void LMDBAL::iStorage::throwCursorNotReady(const std::string& method) const {
|
|
throw CursorNotReady(method, db->name, name);}
|
|
|
|
/**
|
|
* \brief Begins read-only transaction
|
|
*
|
|
* Ment to be called from heirs, name is reported to the database just to be displayed in std::exception::what() message
|
|
*
|
|
* \returns read only transaction
|
|
*/
|
|
LMDBAL::TransactionID LMDBAL::iStorage::beginReadOnlyTransaction() const {
|
|
return db->beginPrivateReadOnlyTransaction(name);}
|
|
|
|
/**
|
|
* \brief Begins writable transaction
|
|
*
|
|
* Ment to be called from heirs, name is reported to the database just to be displayed in std::exception::what() message
|
|
*
|
|
* \returns read only transaction
|
|
*/
|
|
LMDBAL::TransactionID LMDBAL::iStorage::beginTransaction() const {
|
|
return db->beginPrivateTransaction(name);}
|
|
|
|
/**
|
|
* \brief Aborts transaction
|
|
*
|
|
* Ment to be called from heirs, name is reported to the database just to be displayed in std::exception::what() message
|
|
*/
|
|
void LMDBAL::iStorage::abortTransaction(LMDBAL::TransactionID id) const {
|
|
db->abortPrivateTransaction(id, name);}
|
|
|
|
/**
|
|
* \brief Commits transaction
|
|
*
|
|
* Ment to be called from heirs, name is reported to the database just to be displayed in std::exception::what() message
|
|
*
|
|
* \exception LMDBAL::Unknown thrown if something unexpected happened
|
|
*/
|
|
void LMDBAL::iStorage::commitTransaction(LMDBAL::TransactionID id) {
|
|
db->commitPrivateTransaction(id, name);}
|
|
|
|
/**
|
|
* \brief called on beginning of public transaction
|
|
*
|
|
* This function is called on every storage of the database
|
|
* when user calls LMDBAL::Base::beginTransaction() or LMDBAL::Base::beginReadOnlyTransaction()
|
|
*
|
|
* This function is met to be reimplemented in heirs
|
|
* if the heir code requires some transaction custom handling
|
|
*
|
|
* \param[in] txn - ID of started transaction
|
|
* \param[in] readOnly - true if transaction is read-only, false otherwise
|
|
*/
|
|
void LMDBAL::iStorage::transactionStarted(LMDBAL::TransactionID txn, bool readOnly) const {
|
|
UNUSED(txn);
|
|
UNUSED(readOnly);
|
|
}
|
|
|
|
/**
|
|
* \brief called on commitment of public transaction
|
|
*
|
|
* This function is called on every storage of the database
|
|
* when user calls LMDBAL::Base::commitTransaction(LMDBAL::TransactionID)
|
|
*
|
|
* This function is met to be reimplemented in heirs
|
|
* if the heir code requires some transaction custom handling
|
|
*
|
|
* \param[in] txn - ID of started transaction
|
|
*/
|
|
void LMDBAL::iStorage::transactionCommited(LMDBAL::TransactionID txn) {
|
|
UNUSED(txn);}
|
|
|
|
/**
|
|
* \brief called on abortion of public transaction
|
|
*
|
|
* This function is called on every storage of the database
|
|
* when user calls LMDBAL::Base::abortTransaction(LMDBAL::TransactionID)
|
|
*
|
|
* This function is met to be reimplemented in heirs
|
|
* if the heir code requires some transaction custom handling
|
|
*
|
|
* \param[in] txn - ID of started transaction
|
|
*/
|
|
void LMDBAL::iStorage::transactionAborted(LMDBAL::TransactionID txn) const {
|
|
UNUSED(txn);}
|
|
|
|
|
|
|