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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 pq/pq_query_helper.c
* @brief helper functions for Taler-specific libpq (PostGres) interactions
* @author Sree Harsha Totakura <sreeharsha@totakura.in>
* @author Florian Dold
* @author Christian Grothoff
*/
#include "platform.h"
#include <gnunet/gnunet_util_lib.h>
#include <gnunet/gnunet_pq_lib.h>
#include "taler_pq_lib.h"
/**
* Function called to convert input argument into SQL parameters.
*
* @param cls closure
* @param data pointer to input argument, here a `struct TALER_AmountNBO`
* @param data_len number of bytes in @a data (if applicable)
* @param[out] param_values SQL data to set
* @param[out] param_lengths SQL length data to set
* @param[out] param_formats SQL format data to set
* @param param_length number of entries available in the @a param_values, @a param_lengths and @a param_formats arrays
* @param[out] scratch buffer for dynamic allocations (to be done via #GNUNET_malloc()
* @param scratch_length number of entries left in @a scratch
* @return -1 on error, number of offsets used in @a scratch otherwise
*/
static int
qconv_amount_nbo (void *cls,
const void *data,
size_t data_len,
void *param_values[],
int param_lengths[],
int param_formats[],
unsigned int param_length,
void *scratch[],
unsigned int scratch_length)
{
const struct TALER_AmountNBO *amount = data;
unsigned int off = 0;
GNUNET_assert (3 == param_length);
param_values[off] = (void *) &amount->value;
param_lengths[off] = sizeof (amount->value);
param_formats[off] = 1;
off++;
param_values[off] = (void *) &amount->fraction;
param_lengths[off] = sizeof (amount->fraction);
param_formats[off] = 1;
off++;
param_values[off] = (void *) amount->currency;
param_lengths[off] = strlen (amount->currency);
param_formats[off] = 1;
return 0;
}
/**
* 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
* @return array entry for the query parameters to use
*/
struct GNUNET_PQ_QueryParam
TALER_PQ_query_param_amount_nbo (const struct TALER_AmountNBO *x)
{
struct GNUNET_PQ_QueryParam res =
{ &qconv_amount_nbo, NULL, x, sizeof (*x), 3 };
return res;
}
/**
* Function called to convert input argument into SQL parameters.
*
* @param cls closure
* @param data pointer to input argument, here a `struct TALER_Amount`
* @param data_len number of bytes in @a data (if applicable)
* @param[out] param_values SQL data to set
* @param[out] param_lengths SQL length data to set
* @param[out] param_formats SQL format data to set
* @param param_length number of entries available in the @a param_values, @a param_lengths and @a param_formats arrays
* @param[out] scratch buffer for dynamic allocations (to be done via #GNUNET_malloc()
* @param scratch_length number of entries left in @a scratch
* @return -1 on error, number of offsets used in @a scratch otherwise
*/
static int
qconv_amount (void *cls,
const void *data,
size_t data_len,
void *param_values[],
int param_lengths[],
int param_formats[],
unsigned int param_length,
void *scratch[],
unsigned int scratch_length)
{
const struct TALER_Amount *amount_hbo = data;
struct TALER_AmountNBO *amount;
amount = GNUNET_new (struct TALER_AmountNBO);
scratch[0] = amount;
TALER_amount_hton (amount,
amount_hbo);
qconv_amount_nbo (cls,
amount,
sizeof (struct TALER_AmountNBO),
param_values,
param_lengths,
param_formats,
param_length,
&scratch[1],
scratch_length - 1);
return 1;
}
/**
* 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
* @return array entry for the query parameters to use
*/
struct GNUNET_PQ_QueryParam
TALER_PQ_query_param_amount (const struct TALER_Amount *x)
{
struct GNUNET_PQ_QueryParam res =
{ &qconv_amount, NULL, x, sizeof (*x), 3 };
return res;
}
/**
* Function called to convert input argument into SQL parameters.
*
* @param cls closure
* @param data pointer to input argument, here a `json_t *`
* @param data_len number of bytes in @a data (if applicable)
* @param[out] param_values SQL data to set
* @param[out] param_lengths SQL length data to set
* @param[out] param_formats SQL format data to set
* @param param_length number of entries available in the @a param_values, @a param_lengths and @a param_formats arrays
* @param[out] scratch buffer for dynamic allocations (to be done via #GNUNET_malloc()
* @param scratch_length number of entries left in @a scratch
* @return -1 on error, number of offsets used in @a scratch otherwise
*/
static int
qconv_json (void *cls,
const void *data,
size_t data_len,
void *param_values[],
int param_lengths[],
int param_formats[],
unsigned int param_length,
void *scratch[],
unsigned int scratch_length)
{
const json_t *json = data;
char *str;
str = json_dumps (json, JSON_COMPACT);
if (NULL == str)
return -1;
scratch[0] = str;
param_values[0] = (void *) str;
param_lengths[0] = strlen (str);
param_formats[0] = 1;
return 1;
}
/**
* Generate query parameter for a JSON object (stored as a string
* in the DB).
*
* @param x pointer to the json object to pass
*/
struct GNUNET_PQ_QueryParam
TALER_PQ_query_param_json (const json_t *x)
{
struct GNUNET_PQ_QueryParam res =
{ &qconv_json, NULL, x, 0, 1 };
return res;
}
/* end of pq/pq_query_helper.c */
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