wlan-cloud-lib-poco/SQL/SQLite/src/SessionImpl.cpp

//
// SessionImpl.cpp
//
// Library: Data/SQLite
// Package: SQLite
// Module:  SessionImpl
//
// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier:	BSL-1.0
//


#include "Poco/SQL/SQLite/SessionImpl.h"
#include "Poco/SQL/SQLite/Utility.h"
#include "Poco/SQL/SQLite/SQLiteStatementImpl.h"
#include "Poco/SQL/SQLite/SQLiteException.h"
#include "Poco/SQL/Session.h"
#include "Poco/Stopwatch.h"
#include "Poco/String.h"
#include "Poco/Mutex.h"
#include "Poco/SQL/SQLException.h"
#if defined(POCO_UNBUNDLED)
#include <sqlite3.h>
#else
#include "sqlite3.h"
#endif
#include <cstdlib>
#include <limits>


#ifndef SQLITE_OPEN_URI
#define SQLITE_OPEN_URI 0
#endif


namespace Poco {
namespace SQL {
namespace SQLite {


const std::string SessionImpl::DEFERRED_BEGIN_TRANSACTION("BEGIN DEFERRED");
const std::string SessionImpl::COMMIT_TRANSACTION("COMMIT");
const std::string SessionImpl::ABORT_TRANSACTION("ROLLBACK");


SessionImpl::SessionImpl(const std::string& fileName, std::size_t loginTimeout):
	Poco::SQL::AbstractSessionImpl<SessionImpl>(fileName, loginTimeout),
	_connector(Connector::KEY),
	_pDB(0),
	_connected(false),
	_isTransaction(false)
{
	open();
	setConnectionTimeout(loginTimeout);
	setProperty("handle", _pDB);
	addFeature("autoCommit",
		&SessionImpl::autoCommit,
		&SessionImpl::isAutoCommit);
	addProperty("connectionTimeout", &SessionImpl::setConnectionTimeout, &SessionImpl::getConnectionTimeout);
}


SessionImpl::~SessionImpl()
{
	try
	{
		close();
	}
	catch (...)
	{
		poco_unexpected();
	}
}


StatementImpl::Ptr SessionImpl::createStatementImpl()
{
	poco_check_ptr (_pDB);
	return new SQLiteStatementImpl(*this, _pDB);
}


void SessionImpl::begin()
{
	Poco::Mutex::ScopedLock l(_mutex);
	SQLiteStatementImpl tmp(*this, _pDB);
	tmp.add(DEFERRED_BEGIN_TRANSACTION);
	tmp.execute();
	_isTransaction = true;
}


void SessionImpl::commit()
{
	Poco::Mutex::ScopedLock l(_mutex);
	SQLiteStatementImpl tmp(*this, _pDB);
	tmp.add(COMMIT_TRANSACTION);
	tmp.execute();
	_isTransaction = false;
}


void SessionImpl::rollback()
{
	Poco::Mutex::ScopedLock l(_mutex);
	SQLiteStatementImpl tmp(*this, _pDB);
	tmp.add(ABORT_TRANSACTION);
	tmp.execute();
	_isTransaction = false;
}


void SessionImpl::setTransactionIsolation(Poco::UInt32 ti)
{
	if (ti != Session::TRANSACTION_READ_COMMITTED)
		throw Poco::InvalidArgumentException("setTransactionIsolation()");
}


Poco::UInt32 SessionImpl::getTransactionIsolation() const
{
	return Session::TRANSACTION_READ_COMMITTED;
}


bool SessionImpl::hasTransactionIsolation(Poco::UInt32 ti) const
{
	if (ti == Session::TRANSACTION_READ_COMMITTED) return true;
	return false;
}


bool SessionImpl::isTransactionIsolation(Poco::UInt32 ti) const
{
	if (ti == Session::TRANSACTION_READ_COMMITTED) return true;
	return false;
}


void SessionImpl::open(const std::string& connect)
{
	if (connect != connectionString())
	{
		if (isConnected())
			throw InvalidAccessException("Session already connected");

		if (!connect.empty())
			setConnectionString(connect);
	}

	poco_assert_dbg (!connectionString().empty());

	try
	{
		int rc = 0;
		size_t tout = getLoginTimeout();
		Stopwatch sw; sw.start();
		while (true)
		{
			rc = sqlite3_open_v2(connectionString().c_str(), &_pDB,
				SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE | SQLITE_OPEN_URI, NULL);
			if (rc == SQLITE_OK) break;
			if (sw.elapsedSeconds() >= tout)
			{
				close();
				poco_assert(_pDB);
				Utility::throwException(_pDB, rc);
			}
			else Thread::sleep(10);
		}
	}
	catch (SQLiteException& ex)
	{
		throw ConnectionFailedException(ex.displayText());
	}
	catch (AssertionViolationException& ex)
	{
		throw ConnectionFailedException(ex.displayText());
	}

	_connected = true;
}


void SessionImpl::close()
{
	if (_pDB)
	{
		int result = 0;
		int times = 10;
		do
		{
			result = sqlite3_close_v2(_pDB);
		} while (SQLITE_BUSY == result && --times > 0);

		if (SQLITE_BUSY == result && times == 0)
		{
			times = 10;
			sqlite3_stmt *pStmt = NULL;
			do
			{
				pStmt = sqlite3_next_stmt(_pDB, NULL);
				if (pStmt && sqlite3_stmt_busy(pStmt))
				{
					sqlite3_finalize(pStmt);
				}
			} while (pStmt != NULL && --times > 0);
			sqlite3_close_v2(_pDB);
		}
		_pDB = 0;
	}

	_connected = false;
}


void SessionImpl::reset()
{
}


bool SessionImpl::isConnected() const
{
	return _connected;
}


void SessionImpl::setConnectionTimeout(std::size_t timeout)
{
	if(timeout <= std::numeric_limits<int>::max()/1000)
	{
		int tout = 1000 * static_cast<int>(timeout);
		int rc = sqlite3_busy_timeout(_pDB, tout);
		if (rc != 0) Utility::throwException(_pDB, rc);
		_timeout = tout;
	}
	else
	{
		throw RangeException
				("Occurred integer overflow because of timeout value.");
	}
}


void SessionImpl::setConnectionTimeout(const std::string& /*prop*/, const Poco::Any& value)
{
	setConnectionTimeout(Poco::RefAnyCast<std::size_t>(value));
}


Poco::Any SessionImpl::getConnectionTimeout(const std::string& /*prop*/) const
{
	return Poco::Any(_timeout/1000);
}


void SessionImpl::autoCommit(const std::string&, bool)
{
	// The problem here is to decide whether to call commit or rollback
	// when autocommit is set to true. Hence, it is best not to implement
	// this explicit call and only implicitly support autocommit setting.
	throw NotImplementedException(
		"SQLite autocommit is implicit with begin/commit/rollback.");
}


bool SessionImpl::isAutoCommit(const std::string&) const
{
	Poco::Mutex::ScopedLock l(_mutex);
	return (0 != sqlite3_get_autocommit(_pDB));
}


// NOTE: Utility::dbHandle() has been moved here from Utility.cpp
// as a workaround for a failing AnyCast with Clang.
// See <https://github.com/pocoproject/poco/issues/578>
// for a discussion.
sqlite3* Utility::dbHandle(const Session& session)
{
	return AnyCast<sqlite3*>(session.getProperty("handle"));
}


} } } // namespace Poco::SQL::SQLite