Winix framework is a complete infrastructure written in the C++ programming language to create modern web applications and APIs.
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/*
* This file is a part of Winix
* and is distributed under the 2-Clause BSD licence.
* Author: Tomasz Sowa <t.sowa@ttmath.org>
*/
/*
* Copyright (c) 2010-2014, Tomasz Sowa
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <unistd.h>
#include "dbconn.h"
#include "core/log.h"
#include "core/error.h"
namespace Winix
{
DbConn::DbConn()
{
pg_conn = 0;
}
DbConn::~DbConn()
{
Close();
}
PGconn * DbConn::GetPgConn()
{
return pg_conn;
}
void DbConn::SetConnParam(const std::wstring & conn_string)
{
db_conn_string = conn_string;
db_host.clear();
db_port.clear();
db_database.clear();
db_user.clear();
db_pass.clear();
}
void DbConn::SetConnParam(const std::wstring & host, const std::wstring & port, const std::wstring & d, const std::wstring & u, const std::wstring & p)
{
db_conn_string.clear();
db_host = host;
db_port = port;
db_database = d;
db_user = u;
db_pass = p;
}
void DbConn::Connect()
{
Close();
conn_info.Clear();
conn_info.SetExtented(false);
if( !db_conn_string.empty() )
{
conn_info << R(db_conn_string);
}
else
{
conn_info << R("dbname=") << db_database
<< R(" user=") << db_user
<< R(" password=") << db_pass;
if( !db_host.empty() )
{
conn_info << R(L"hostaddr=") << db_host;
}
if( !db_port.empty() )
{
conn_info << R(L"port=") << db_port;
}
}
pg_conn = PQconnectdb(conn_info.CStr());
// warning! pg_conn can be not null but there cannnot be a connection established
// use PQstatus(pg_conn) to check whether the connection works fine
}
void DbConn::LogConnectionSocket()
{
log << log2 << "Db: connection to the database works fine" << logend;
log << log3 << "Db: connection socket: " << PQsocket(pg_conn) << logend;
}
void DbConn::WaitForConnection()
{
if( !pg_conn || PQstatus(pg_conn) != CONNECTION_OK )
{
log << log3 << "Db: waiting for the db to be ready...." << logend << logsave;
while( !AssertConnection(false, false) )
sleep(5);
LogConnectionSocket();
}
}
void DbConn::Close()
{
if( pg_conn )
{
PQfinish(pg_conn);
pg_conn = 0;
}
}
bool DbConn::AssertConnection(bool put_log, bool throw_if_no_connection)
{
bool was_connection = true;
if( !pg_conn )
{
was_connection = false;
Connect();
}
else
if( PQstatus(pg_conn) != CONNECTION_OK )
{
if( put_log )
log << log2 << "Db: connection to the database is lost, trying to recover" << logend;
was_connection = false;
PQreset(pg_conn);
}
if( pg_conn && PQstatus(pg_conn) == CONNECTION_OK )
{
if( !was_connection )
{
if( put_log )
LogConnectionSocket();
SetDbParameters();
}
return true;
}
else
{
if( put_log )
log << log1 << "Db: connection to db server cannot be established" << logend;
if( throw_if_no_connection )
throw Error(WINIX_ERR_DB_FATAL_ERROR_DURING_CONNECTING);
return false;
}
}
void DbConn::SetDbParameters()
{
if( PQsetClientEncoding(pg_conn, "UTF8") == -1 )
log << log1 << "Db: Can't set the proper client encoding" << logend;
}
} // namespace Winix