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/*
This file is part of TALER
Copyright (C) 2014 Christian Grothoff (and other contributing authors)
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, If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file pq/db_pq.c
* @brief helper functions for 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 "taler_pq_lib.h"
/**
* Execute a prepared statement.
*/
PGresult *
TALER_PQ_exec_prepared (PGconn *db_conn,
const char *name,
const struct TALER_PQ_QueryParam *params)
{
unsigned len;
unsigned i;
/* count the number of parameters */
{
const struct TALER_PQ_QueryParam *x;
for (len = 0, x = params;
x->more;
len++, x++);
}
/* new scope to allow stack allocation without alloca */
{
void *param_values[len];
int param_lengths[len];
int param_formats[len];
for (i = 0; i < len; i += 1)
{
param_values[i] = (void *) params[i].data;
param_lengths[i] = params[i].size;
param_formats[i] = 1;
}
return PQexecPrepared (db_conn, name, len,
(const char **) param_values,
param_lengths,
param_formats, 1);
}
}
/**
* Extract results from a query result according to the given specification.
* If colums are NULL, the destination is not modified, and #GNUNET_NO
* is returned.
*
* @return
* #GNUNET_YES if all results could be extracted
* #GNUNET_NO if at least one result was NULL
* #GNUNET_SYSERR if a result was invalid (non-existing field)
*/
int
TALER_PQ_extract_result (PGresult *result,
struct TALER_PQ_ResultSpec *rs,
int row)
{
int had_null = GNUNET_NO;
size_t len;
unsigned int i;
unsigned int j;
for (i=0; NULL != rs[i].fname; i++)
{
int fnum;
fnum = PQfnumber (result, rs[i].fname);
if (fnum < 0)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"field '%s' does not exist in result\n",
rs[i].fname);
return GNUNET_SYSERR;
}
/* if a field is null, continue but
* remember that we now return a different result */
if (PQgetisnull (result, row, fnum))
{
had_null = GNUNET_YES;
continue;
}
const char *res;
len = PQgetlength (result, row, fnum);
if ( (0 != rs[i].dst_size) &&
(rs[i].dst_size != len) )
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"field '%s' has wrong size (got %u, expected %u)\n",
rs[i].fname,
(unsigned int) len,
(unsigned int) rs[i].dst_size);
for (j=0; j<i; j++)
if (0 == rs[j].dst_size)
{
GNUNET_free (rs[j].dst);
rs[j].dst = NULL;
*rs[j].result_size = 0;
}
return GNUNET_SYSERR;
}
res = PQgetvalue (result, row, fnum);
GNUNET_assert (NULL != res);
if (0 == rs[i].dst_size)
{
*rs[i].result_size = len;
*((void **) rs[i].dst) = GNUNET_malloc (len);
rs[i].dst = *((void **) rs[i].dst);
}
memcpy (rs[i].dst, res, len);
}
if (GNUNET_YES == had_null)
return GNUNET_NO;
return GNUNET_YES;
}
int
TALER_PQ_field_isnull (PGresult *result,
int row,
const char *fname)
{
int fnum;
fnum = PQfnumber (result, fname);
GNUNET_assert (fnum >= 0);
if (PQgetisnull (result, row, fnum))
return GNUNET_YES;
return GNUNET_NO;
}
int
TALER_PQ_extract_amount_nbo (PGresult *result,
int row,
const char *val_name,
const char *frac_name,
const char *curr_name,
struct TALER_AmountNBO *r_amount_nbo)
{
int val_num;
int frac_num;
int curr_num;
int len;
GNUNET_assert (NULL != strstr (val_name, "_val"));
GNUNET_assert (NULL != strstr (frac_name, "_frac"));
GNUNET_assert (NULL != strstr (curr_name, "_curr"));
val_num = PQfnumber (result, val_name);
GNUNET_assert (val_num >= 0);
frac_num = PQfnumber (result, frac_name);
GNUNET_assert (frac_num >= 0);
curr_num = PQfnumber (result, curr_name);
GNUNET_assert (curr_num >= 0);
r_amount_nbo->value = *(uint64_t *) PQgetvalue (result, row, val_num);
r_amount_nbo->fraction = *(uint32_t *) PQgetvalue (result, row, frac_num);
memset (r_amount_nbo->currency,
0,
TALER_CURRENCY_LEN);
len = GNUNET_MIN (TALER_CURRENCY_LEN - 1,
PQgetlength (result, row, curr_num));
memcpy (r_amount_nbo->currency,
PQgetvalue (result,
row,
curr_num),
len);
return GNUNET_OK;
}
int
TALER_PQ_extract_amount (PGresult *result,
int row,
const char *val_name,
const char *frac_name,
const char *curr_name,
struct TALER_Amount *r_amount)
{
struct TALER_AmountNBO amount_nbo;
(void)
TALER_PQ_extract_amount_nbo (result,
row,
val_name,
frac_name,
curr_name,
&amount_nbo);
r_amount->value = GNUNET_ntohll (amount_nbo.value);
r_amount->fraction = ntohl (amount_nbo.fraction);
(void) strncpy (r_amount->currency, amount_nbo.currency, TALER_CURRENCY_LEN);
return GNUNET_OK;
}
/* end of pq/db_pq.c */
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