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/*
This file is part of TALER
Copyright (C) 2014, 2015, 2016 GNUnet e.V.
TALER 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, or (at your option) any later version.
TALER 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
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file include/taler_pq_lib.h
* @brief helper functions for DB interactions
* @author Sree Harsha Totakura <sreeharsha@totakura.in>
* @author Florian Dold
* @author Christian Grothoff
*/
#ifndef TALER_PQ_LIB_H_
#define TALER_PQ_LIB_H_
#include <libpq-fe.h>
#include <jansson.h>
#include <gnunet/gnunet_pq_lib.h>
#include "taler_util.h"
/**
* Generate query parameter for a currency, consisting of the three
* components "value", "fraction" and "currency" in this order. The
* types must be a 64-bit integer, 32-bit integer and a
* #TALER_CURRENCY_LEN-sized BLOB/VARCHAR respectively.
*
* @param x pointer to the query parameter to pass
*/
struct GNUNET_PQ_QueryParam
TALER_PQ_query_param_amount_nbo (const struct TALER_AmountNBO *x);
/**
* Generate query parameter for a currency, consisting of the three
* components "value", "fraction" and "currency" in this order. The
* types must be a 64-bit integer, 32-bit integer and a
* #TALER_CURRENCY_LEN-sized BLOB/VARCHAR respectively.
*
* @param x pointer to the query parameter to pass
*/
struct GNUNET_PQ_QueryParam
TALER_PQ_query_param_amount (const struct TALER_Amount *x);
/**
* Generate query parameter for a JSON object (stored as a string
* in the DB). Note that @a x must really be a JSON object or array,
* passing just a value (string, integer) is not supported and will
* result in an abort.
*
* @param x pointer to the json object to pass
*/
struct GNUNET_PQ_QueryParam
TALER_PQ_query_param_json (const json_t *x);
/**
* Generate query parameter for an absolute time value.
* In contrast to
* #GNUNET_PQ_query_param_absolute_time(), this function
* will abort (!) if the time given is not rounded!
* The database must store a 64-bit integer.
*
* @param x pointer to the query parameter to pass
*/
struct GNUNET_PQ_QueryParam
TALER_PQ_query_param_absolute_time (const struct GNUNET_TIME_Absolute *x);
/**
* Generate query parameter for an absolute time value.
* In contrast to
* #GNUNET_PQ_query_param_absolute_time(), this function
* will abort (!) if the time given is not rounded!
* The database must store a 64-bit integer.
*
* @param x pointer to the query parameter to pass
*/
struct GNUNET_PQ_QueryParam
TALER_PQ_query_param_absolute_time_nbo (const struct GNUNET_TIME_AbsoluteNBO *x);
/**
* Currency amount expected.
*
* @param name name of the field in the table
* @param currency expected currency for the @a amount
* @param[out] amount where to store the result
* @return array entry for the result specification to use
*/
struct GNUNET_PQ_ResultSpec
TALER_PQ_result_spec_amount_nbo (const char *name,
const char *currency,
struct TALER_AmountNBO *amount);
/**
* Currency amount expected.
*
* @param name name of the field in the table
* @param currency expected currency for the @a amount
* @param[out] amount where to store the result
* @return array entry for the result specification to use
*/
struct GNUNET_PQ_ResultSpec
TALER_PQ_result_spec_amount (const char *name,
const char *currency,
struct TALER_Amount *amount);
/**
* json_t expected.
*
* @param name name of the field in the table
* @param[out] jp where to store the result
* @return array entry for the result specification to use
*/
struct GNUNET_PQ_ResultSpec
TALER_PQ_result_spec_json (const char *name,
json_t **jp);
/**
* Rounded absolute time expected.
* In contrast to #GNUNET_PQ_query_param_absolute_time_nbo(),
* this function ensures that the result is rounded and can
* be converted to JSON.
*
* @param name name of the field in the table
* @param[out] at where to store the result
* @return array entry for the result specification to use
*/
struct GNUNET_PQ_ResultSpec
TALER_PQ_result_spec_absolute_time (const char *name,
struct GNUNET_TIME_Absolute *at);
/**
* Rounded absolute time expected.
* In contrast to #GNUNET_PQ_result_spec_absolute_time_nbo(),
* this function ensures that the result is rounded and can
* be converted to JSON.
*
* @param name name of the field in the table
* @param[out] at where to store the result
* @return array entry for the result specification to use
*/
struct GNUNET_PQ_ResultSpec
TALER_PQ_result_spec_absolute_time_nbo (const char *name,
struct GNUNET_TIME_AbsoluteNBO *at);
#endif /* TALER_PQ_LIB_H_ */
/* end of include/taler_pq_lib.h */
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