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/*
This file is part of GNUnet
Copyright (C) 2017 GNUnet e.V.
GNUnet 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.
GNUnet 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
Affero General Public License for more details.
*/
/**
* @file pq/pq_connect.c
* @brief functions to connect to libpq (PostGres)
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_pq_lib.h"
/**
* Function called by libpq whenever it wants to log something.
* We already log whenever we care, so this function does nothing
* and merely exists to silence the libpq logging.
*
* @param arg the SQL connection that was used
* @param res information about some libpq event
*/
static void
pq_notice_receiver_cb (void *arg,
const PGresult *res)
{
/* do nothing, intentionally */
}
/**
* Function called by libpq whenever it wants to log something.
* We log those using the Taler logger.
*
* @param arg the SQL connection that was used
* @param message information about some libpq event
*/
static void
pq_notice_processor_cb (void *arg,
const char *message)
{
GNUNET_log_from (GNUNET_ERROR_TYPE_INFO,
"pq",
"%s",
message);
}
/**
* Create a connection to the Postgres database using @a config_str
* for the configuration. Initialize logging via GNUnet's log
* routines and disable Postgres's logger.
*
* @param config_str configuration to use
* @return NULL on error
*/
PGconn *
GNUNET_PQ_connect (const char *config_str)
{
PGconn *conn;
conn = PQconnectdb (config_str);
if ( (NULL == conn) ||
(CONNECTION_OK !=
PQstatus (conn)) )
{
GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
"pq",
"Database connection to '%s' failed: %s\n",
config_str,
(NULL != conn) ?
PQerrorMessage (conn)
: "PQconnectdb returned NULL");
if (NULL != conn)
PQfinish (conn);
return NULL;
}
PQsetNoticeReceiver (conn,
&pq_notice_receiver_cb,
conn);
PQsetNoticeProcessor (conn,
&pq_notice_processor_cb,
conn);
return conn;
}
/**
* Connect to a postgres database using the configuration
* option "CONFIG" in @a section.
*
* @param cfg configuration
* @param section configuration section to use to get Postgres configuration options
* @return the postgres handle, NULL on error
*/
PGconn *
GNUNET_PQ_connect_with_cfg (const struct GNUNET_CONFIGURATION_Handle * cfg,
const char *section)
{
PGconn *dbh;
char *conninfo;
/* Open database and precompile statements */
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_string (cfg,
section,
"CONFIG",
&conninfo))
conninfo = NULL;
dbh = GNUNET_PQ_connect (conninfo == NULL ? "" : conninfo);
GNUNET_free_non_null (conninfo);
return dbh;
}
/* end of pq/pq_connect.c */
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