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