884 lines
26 KiB
C
884 lines
26 KiB
C
/*
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This file is part of TALER
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Copyright (C) 2014, 2015 Christian Grothoff (and other contributing authors)
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TALER is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 3, or (at your option) any later version.
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TALER is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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TALER; see the file COPYING. If not, If not, see <http://www.gnu.org/licenses/>
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*/
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/**
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* @file pq/db_pq.c
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* @brief helper functions for libpq (PostGres) interactions
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* @author Sree Harsha Totakura <sreeharsha@totakura.in>
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* @author Florian Dold
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* @author Christian Grothoff
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*/
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#include "platform.h"
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#include <gnunet/gnunet_util_lib.h>
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#include "taler_pq_lib.h"
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/**
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* Execute a prepared statement.
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*
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* @param db_conn database connection
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* @param name name of the prepared statement
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* @param params parameters to the statement
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* @return postgres result
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*/
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PGresult *
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TALER_PQ_exec_prepared (PGconn *db_conn,
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const char *name,
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const struct TALER_PQ_QueryParam *params)
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{
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unsigned int len;
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unsigned int i;
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/* count the number of parameters */
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i = 0;
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len = 0;
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while (TALER_PQ_QF_END != params[i].format)
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{
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const struct TALER_PQ_QueryParam *x = ¶ms[i];
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switch (x->format)
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{
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case TALER_PQ_QF_FIXED_BLOB:
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case TALER_PQ_QF_VARSIZE_BLOB:
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len++;
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break;
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case TALER_PQ_QF_AMOUNT_NBO:
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case TALER_PQ_QF_AMOUNT:
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len += 3;
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break;
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case TALER_PQ_QF_RSA_PUBLIC_KEY:
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case TALER_PQ_QF_RSA_SIGNATURE:
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case TALER_PQ_QF_TIME_ABSOLUTE:
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case TALER_PQ_QF_UINT16:
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case TALER_PQ_QF_UINT32:
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case TALER_PQ_QF_UINT64:
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case TALER_PQ_QF_JSON:
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len++;
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break;
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default:
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/* format not supported */
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GNUNET_assert (0);
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break;
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}
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i++;
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}
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/* new scope to allow stack allocation without alloca */
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{
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/* Scratch buffer for temporary storage */
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void *scratch[len];
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/* Parameter array we are building for the query */
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void *param_values[len];
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int param_lengths[len];
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int param_formats[len];
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unsigned int off;
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/* How many entries in the scratch buffer are in use? */
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unsigned int soff;
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PGresult *res;
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i = 0;
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off = 0;
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soff = 0;
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while (TALER_PQ_QF_END != params[i].format)
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{
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const struct TALER_PQ_QueryParam *x = ¶ms[i];
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switch (x->format)
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{
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case TALER_PQ_QF_FIXED_BLOB:
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case TALER_PQ_QF_VARSIZE_BLOB:
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param_values[off] = (void *) x->data;
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param_lengths[off] = x->size;
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param_formats[off] = 1;
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off++;
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break;
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case TALER_PQ_QF_AMOUNT_NBO:
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{
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const struct TALER_Amount *amount = x->data;
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param_values[off] = (void *) &amount->value;
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param_lengths[off] = sizeof (amount->value);
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param_formats[off] = 1;
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off++;
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param_values[off] = (void *) &amount->fraction;
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param_lengths[off] = sizeof (amount->fraction);
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param_formats[off] = 1;
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off++;
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param_values[off] = (void *) amount->currency;
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param_lengths[off] = strlen (amount->currency);
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param_formats[off] = 1;
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off++;
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}
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break;
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case TALER_PQ_QF_AMOUNT:
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{
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const struct TALER_Amount *amount_hbo = x->data;
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struct TALER_AmountNBO *amount;
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amount = GNUNET_new (struct TALER_AmountNBO);
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scratch[soff++] = amount;
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TALER_amount_hton (amount,
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amount_hbo);
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param_values[off] = (void *) &amount->value;
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param_lengths[off] = sizeof (amount->value);
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param_formats[off] = 1;
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off++;
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param_values[off] = (void *) &amount->fraction;
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param_lengths[off] = sizeof (amount->fraction);
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param_formats[off] = 1;
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off++;
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param_values[off] = (void *) amount->currency;
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param_lengths[off] = strlen (amount->currency);
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param_formats[off] = 1;
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off++;
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}
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break;
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case TALER_PQ_QF_RSA_PUBLIC_KEY:
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{
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const struct GNUNET_CRYPTO_rsa_PublicKey *rsa = x->data;
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char *buf;
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size_t buf_size;
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buf_size = GNUNET_CRYPTO_rsa_public_key_encode (rsa,
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&buf);
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scratch[soff++] = buf;
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param_values[off] = (void *) buf;
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param_lengths[off] = buf_size - 1; /* DB doesn't like the trailing \0 */
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param_formats[off] = 1;
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off++;
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}
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break;
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case TALER_PQ_QF_RSA_SIGNATURE:
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{
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const struct GNUNET_CRYPTO_rsa_Signature *sig = x->data;
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char *buf;
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size_t buf_size;
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buf_size = GNUNET_CRYPTO_rsa_signature_encode (sig,
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&buf);
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scratch[soff++] = buf;
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param_values[off] = (void *) buf;
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param_lengths[off] = buf_size - 1; /* DB doesn't like the trailing \0 */
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param_formats[off] = 1;
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off++;
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}
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break;
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case TALER_PQ_QF_TIME_ABSOLUTE:
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{
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const struct GNUNET_TIME_Absolute *at_hbo = x->data;
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struct GNUNET_TIME_AbsoluteNBO *at_nbo;
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at_nbo = GNUNET_new (struct GNUNET_TIME_AbsoluteNBO);
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scratch[soff++] = at_nbo;
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*at_nbo = GNUNET_TIME_absolute_hton (*at_hbo);
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param_values[off] = (void *) at_nbo;
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param_lengths[off] = sizeof (struct GNUNET_TIME_AbsoluteNBO);
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param_formats[off] = 1;
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off++;
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}
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break;
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case TALER_PQ_QF_UINT16:
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{
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const uint16_t *u_hbo = x->data;
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uint16_t *u_nbo;
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u_nbo = GNUNET_new (uint16_t);
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scratch[soff++] = u_nbo;
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*u_nbo = htons (*u_hbo);
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param_values[off] = (void *) u_nbo;
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param_lengths[off] = sizeof (uint16_t);
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param_formats[off] = 1;
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off++;
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}
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break;
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case TALER_PQ_QF_UINT32:
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{
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const uint32_t *u_hbo = x->data;
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uint32_t *u_nbo;
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u_nbo = GNUNET_new (uint32_t);
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scratch[soff++] = u_nbo;
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*u_nbo = htonl (*u_hbo);
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param_values[off] = (void *) u_nbo;
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param_lengths[off] = sizeof (uint32_t);
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param_formats[off] = 1;
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off++;
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}
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break;
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case TALER_PQ_QF_UINT64:
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{
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const uint64_t *u_hbo = x->data;
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uint64_t *u_nbo;
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u_nbo = GNUNET_new (uint64_t);
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scratch[soff++] = u_nbo;
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*u_nbo = GNUNET_htonll (*u_hbo);
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param_values[off] = (void *) u_nbo;
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param_lengths[off] = sizeof (uint64_t);
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param_formats[off] = 1;
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off++;
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}
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break;
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case TALER_PQ_QF_JSON:
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{
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const json_t *json = x->data;
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char *str;
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str = json_dumps (json, JSON_COMPACT);
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GNUNET_assert (NULL != str);
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scratch[soff++] = str;
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param_values[off] = (void *) str;
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param_lengths[off] = strlen (str);
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param_formats[off] = 1;
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off++;
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}
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break;
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default:
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/* format not supported */
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GNUNET_assert (0);
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break;
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}
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i++;
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}
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GNUNET_assert (off == len);
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res = PQexecPrepared (db_conn,
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name,
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len,
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(const char **) param_values,
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param_lengths,
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param_formats,
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1);
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for (off = 0; off < soff; off++)
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GNUNET_free (scratch[off]);
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return res;
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}
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}
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/**
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* Free all memory that was allocated in @a rs during
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* #TALER_PQ_extract_result().
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*
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* @param rs reult specification to clean up
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*/
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void
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TALER_PQ_cleanup_result (struct TALER_PQ_ResultSpec *rs)
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{
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unsigned int i;
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for (i=0; TALER_PQ_RF_END != rs[i].format; i++)
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{
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switch (rs[i].format)
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{
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case TALER_PQ_RF_VARSIZE_BLOB:
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{
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void **dst = rs[i].dst;
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if (NULL != *dst)
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{
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GNUNET_free (*dst);
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*dst = NULL;
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*rs[i].result_size = 0;
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}
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break;
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}
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case TALER_PQ_RF_RSA_PUBLIC_KEY:
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{
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void **dst = rs[i].dst;
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if (NULL != *dst)
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{
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GNUNET_CRYPTO_rsa_public_key_free (*dst);
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*dst = NULL;
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}
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break;
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}
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case TALER_PQ_RF_RSA_SIGNATURE:
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{
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void **dst = rs[i].dst;
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if (NULL != *dst)
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{
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GNUNET_CRYPTO_rsa_signature_free (*dst);
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*dst = NULL;
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}
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}
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break;
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default:
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break;
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}
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}
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}
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/**
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* Extract results from a query result according to the given specification.
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* If colums are NULL, the destination is not modified, and #GNUNET_NO
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* is returned.
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*
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* @param result result to process
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* @param[in,out] rs result specification to extract for
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* @param row row from the result to extract
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* @return
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* #GNUNET_YES if all results could be extracted
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* #GNUNET_NO if at least one result was NULL
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* #GNUNET_SYSERR if a result was invalid (non-existing field)
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*/
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int
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TALER_PQ_extract_result (PGresult *result,
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struct TALER_PQ_ResultSpec *rs,
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int row)
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{
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unsigned int i;
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int had_null = GNUNET_NO;
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for (i=0; TALER_PQ_RF_END != rs[i].format; i++)
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{
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struct TALER_PQ_ResultSpec *spec;
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spec = &rs[i];
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switch (spec->format)
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{
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case TALER_PQ_RF_FIXED_BLOB:
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case TALER_PQ_RF_VARSIZE_BLOB:
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{
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size_t len;
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const char *res;
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void *dst;
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int fnum;
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fnum = PQfnumber (result,
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spec->fname);
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if (fnum < 0)
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{
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GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
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"Field `%s' does not exist in result\n",
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spec->fname);
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return GNUNET_SYSERR;
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}
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if (PQgetisnull (result,
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row,
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fnum))
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{
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had_null = GNUNET_YES;
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continue;
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}
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/* if a field is null, continue but
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* remember that we now return a different result */
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len = PQgetlength (result,
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row,
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fnum);
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if ( (0 != spec->dst_size) &&
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(spec->dst_size != len) )
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{
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GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
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"Field `%s' has wrong size (got %u, expected %u)\n",
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spec->fname,
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(unsigned int) len,
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(unsigned int) spec->dst_size);
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TALER_PQ_cleanup_result (rs);
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return GNUNET_SYSERR;
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}
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res = PQgetvalue (result,
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row,
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fnum);
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GNUNET_assert (NULL != res);
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if (0 == spec->dst_size)
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{
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if (NULL != spec->result_size)
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*spec->result_size = len;
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spec->dst_size = len;
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dst = GNUNET_malloc (len);
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*((void **) spec->dst) = dst;
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}
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else
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dst = spec->dst;
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memcpy (dst,
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res,
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len);
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break;
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}
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case TALER_PQ_RF_AMOUNT_NBO:
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{
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char *val_name;
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char *frac_name;
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char *curr_name;
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const char *name = spec->fname;
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int ret;
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GNUNET_assert (NULL != spec->dst);
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GNUNET_assert (sizeof (struct TALER_AmountNBO) ==
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spec->dst_size);
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GNUNET_asprintf (&val_name,
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"%s_val",
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name);
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GNUNET_asprintf (&frac_name,
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"%s_frac",
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name);
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GNUNET_asprintf (&curr_name,
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"%s_curr",
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name);
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ret = TALER_PQ_extract_amount_nbo (result,
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row,
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val_name,
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frac_name,
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curr_name,
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spec->dst);
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GNUNET_free (val_name);
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GNUNET_free (frac_name);
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GNUNET_free (curr_name);
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if (GNUNET_SYSERR == ret)
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return GNUNET_SYSERR;
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if (GNUNET_OK != ret)
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had_null = GNUNET_YES;
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break;
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}
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case TALER_PQ_RF_AMOUNT:
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{
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char *val_name;
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char *frac_name;
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char *curr_name;
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const char *name = spec->fname;
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int ret;
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GNUNET_assert (NULL != spec->dst);
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GNUNET_assert (sizeof (struct TALER_Amount) ==
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spec->dst_size);
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GNUNET_asprintf (&val_name,
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"%s_val",
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name);
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GNUNET_asprintf (&frac_name,
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"%s_frac",
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name);
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GNUNET_asprintf (&curr_name,
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"%s_curr",
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name);
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ret = TALER_PQ_extract_amount (result,
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row,
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val_name,
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frac_name,
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curr_name,
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spec->dst);
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GNUNET_free (val_name);
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GNUNET_free (frac_name);
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GNUNET_free (curr_name);
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if (GNUNET_SYSERR == ret)
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return GNUNET_SYSERR;
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if (GNUNET_OK != ret)
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had_null = GNUNET_YES;
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break;
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}
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case TALER_PQ_RF_RSA_PUBLIC_KEY:
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{
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struct GNUNET_CRYPTO_rsa_PublicKey **pk = spec->dst;
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size_t len;
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const char *res;
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int fnum;
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*pk = NULL;
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fnum = PQfnumber (result,
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spec->fname);
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if (fnum < 0)
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{
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GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
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"Field `%s' does not exist in result\n",
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spec->fname);
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return GNUNET_SYSERR;
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}
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if (PQgetisnull (result,
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row,
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fnum))
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{
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had_null = GNUNET_YES;
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continue;
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}
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/* if a field is null, continue but
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* remember that we now return a different result */
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len = PQgetlength (result,
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row,
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fnum);
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res = PQgetvalue (result,
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row,
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fnum);
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*pk = GNUNET_CRYPTO_rsa_public_key_decode (res,
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len);
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if (NULL == *pk)
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{
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GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
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"Field `%s' contains bogus value (fails to decode)\n",
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spec->fname);
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return GNUNET_SYSERR;
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}
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break;
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}
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case TALER_PQ_RF_RSA_SIGNATURE:
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{
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struct GNUNET_CRYPTO_rsa_Signature **sig = spec->dst;
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size_t len;
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const char *res;
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int fnum;
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*sig = NULL;
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fnum = PQfnumber (result,
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spec->fname);
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if (fnum < 0)
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{
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|
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
|
|
"Field `%s' does not exist in result\n",
|
|
spec->fname);
|
|
return GNUNET_SYSERR;
|
|
}
|
|
if (PQgetisnull (result,
|
|
row,
|
|
fnum))
|
|
{
|
|
had_null = GNUNET_YES;
|
|
continue;
|
|
}
|
|
|
|
/* if a field is null, continue but
|
|
* remember that we now return a different result */
|
|
len = PQgetlength (result,
|
|
row,
|
|
fnum);
|
|
res = PQgetvalue (result,
|
|
row,
|
|
fnum);
|
|
*sig = GNUNET_CRYPTO_rsa_signature_decode (res,
|
|
len);
|
|
if (NULL == *sig)
|
|
{
|
|
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
|
|
"Field `%s' contains bogus value (fails to decode)\n",
|
|
spec->fname);
|
|
return GNUNET_SYSERR;
|
|
}
|
|
break;
|
|
}
|
|
case TALER_PQ_RF_TIME_ABSOLUTE:
|
|
{
|
|
struct GNUNET_TIME_Absolute *dst = spec->dst;
|
|
const struct GNUNET_TIME_AbsoluteNBO *res;
|
|
int fnum;
|
|
|
|
fnum = PQfnumber (result,
|
|
spec->fname);
|
|
if (fnum < 0)
|
|
{
|
|
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
|
|
"Field `%s' does not exist in result\n",
|
|
spec->fname);
|
|
return GNUNET_SYSERR;
|
|
}
|
|
if (PQgetisnull (result,
|
|
row,
|
|
fnum))
|
|
{
|
|
had_null = GNUNET_YES;
|
|
continue;
|
|
}
|
|
GNUNET_assert (NULL != dst);
|
|
GNUNET_assert (sizeof (struct GNUNET_TIME_AbsoluteNBO) ==
|
|
spec->dst_size);
|
|
res = (const struct GNUNET_TIME_AbsoluteNBO *)
|
|
PQgetvalue (result,
|
|
row,
|
|
fnum);
|
|
*dst = GNUNET_TIME_absolute_ntoh (*res);
|
|
break;
|
|
}
|
|
case TALER_PQ_RF_UINT16:
|
|
{
|
|
uint16_t *dst = spec->dst;
|
|
const uint16_t *res;
|
|
int fnum;
|
|
|
|
fnum = PQfnumber (result,
|
|
spec->fname);
|
|
if (fnum < 0)
|
|
{
|
|
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
|
|
"Field `%s' does not exist in result\n",
|
|
spec->fname);
|
|
return GNUNET_SYSERR;
|
|
}
|
|
if (PQgetisnull (result,
|
|
row,
|
|
fnum))
|
|
{
|
|
had_null = GNUNET_YES;
|
|
continue;
|
|
}
|
|
GNUNET_assert (NULL != dst);
|
|
GNUNET_assert (sizeof (uint16_t) ==
|
|
spec->dst_size);
|
|
res = (uint16_t *) PQgetvalue (result,
|
|
row,
|
|
fnum);
|
|
*dst = ntohs (*res);
|
|
break;
|
|
}
|
|
case TALER_PQ_RF_UINT32:
|
|
{
|
|
uint32_t *dst = spec->dst;
|
|
const uint32_t *res;
|
|
int fnum;
|
|
|
|
fnum = PQfnumber (result,
|
|
spec->fname);
|
|
if (fnum < 0)
|
|
{
|
|
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
|
|
"Field `%s' does not exist in result\n",
|
|
spec->fname);
|
|
return GNUNET_SYSERR;
|
|
}
|
|
if (PQgetisnull (result,
|
|
row,
|
|
fnum))
|
|
{
|
|
had_null = GNUNET_YES;
|
|
continue;
|
|
}
|
|
GNUNET_assert (NULL != dst);
|
|
GNUNET_assert (sizeof (uint32_t) ==
|
|
spec->dst_size);
|
|
res = (uint32_t *) PQgetvalue (result,
|
|
row,
|
|
fnum);
|
|
*dst = ntohl (*res);
|
|
break;
|
|
}
|
|
case TALER_PQ_RF_UINT64:
|
|
{
|
|
uint64_t *dst = spec->dst;
|
|
const uint64_t *res;
|
|
int fnum;
|
|
|
|
fnum = PQfnumber (result,
|
|
spec->fname);
|
|
if (fnum < 0)
|
|
{
|
|
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
|
|
"Field `%s' does not exist in result\n",
|
|
spec->fname);
|
|
return GNUNET_SYSERR;
|
|
}
|
|
if (PQgetisnull (result,
|
|
row,
|
|
fnum))
|
|
{
|
|
had_null = GNUNET_YES;
|
|
continue;
|
|
}
|
|
GNUNET_assert (NULL != dst);
|
|
GNUNET_assert (sizeof (uint64_t) ==
|
|
spec->dst_size);
|
|
res = (uint64_t *) PQgetvalue (result,
|
|
row,
|
|
fnum);
|
|
*dst = GNUNET_ntohll (*res);
|
|
break;
|
|
}
|
|
case TALER_PQ_RF_JSON:
|
|
{
|
|
json_t **dst = spec->dst;
|
|
char *res;
|
|
int fnum;
|
|
json_error_t json_error;
|
|
size_t slen;
|
|
|
|
fnum = PQfnumber (result,
|
|
spec->fname);
|
|
if (fnum < 0)
|
|
{
|
|
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
|
|
"Field `%s' does not exist in result\n",
|
|
spec->fname);
|
|
return GNUNET_SYSERR;
|
|
}
|
|
if (PQgetisnull (result,
|
|
row,
|
|
fnum))
|
|
{
|
|
had_null = GNUNET_YES;
|
|
continue;
|
|
}
|
|
GNUNET_assert (NULL != dst);
|
|
GNUNET_break (0 == spec->dst_size);
|
|
slen = PQgetlength (result,
|
|
row,
|
|
fnum);
|
|
res = (char *) PQgetvalue (result,
|
|
row,
|
|
fnum);
|
|
*dst = json_loadb (res,
|
|
slen,
|
|
JSON_REJECT_DUPLICATES,
|
|
&json_error);
|
|
if (NULL == *dst)
|
|
{
|
|
TALER_json_warn (json_error);
|
|
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
|
|
"Failed to parse JSON result for field `%s'\n",
|
|
spec->fname);
|
|
return GNUNET_SYSERR;
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
GNUNET_assert (0);
|
|
break;
|
|
}
|
|
}
|
|
if (GNUNET_YES == had_null)
|
|
return GNUNET_NO;
|
|
return GNUNET_YES;
|
|
}
|
|
|
|
|
|
/**
|
|
* Extract a currency amount from a query result according to the
|
|
* given specification.
|
|
*
|
|
* @param result the result to extract the amount from
|
|
* @param row which row of the result to extract the amount from (needed as results can have multiple rows)
|
|
* @param val_name name of the column with the amount's "value", must include the substring "_val".
|
|
* @param frac_name name of the column with the amount's "fractional" value, must include the substring "_frac".
|
|
* @param curr_name name of the column with the amount's currency name, must include the substring "_curr".
|
|
* @param[out] r_amount_nbo where to store the amount, in network byte order
|
|
* @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_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;
|
|
|
|
/* These checks are simply to check that clients obey by our naming
|
|
conventions, and not for any functional reason */
|
|
GNUNET_assert (NULL !=
|
|
strstr (val_name,
|
|
"_val"));
|
|
GNUNET_assert (NULL !=
|
|
strstr (frac_name,
|
|
"_frac"));
|
|
GNUNET_assert (NULL !=
|
|
strstr (curr_name,
|
|
"_curr"));
|
|
/* Set return value to invalid in case we don't finish */
|
|
memset (r_amount_nbo,
|
|
0,
|
|
sizeof (struct TALER_AmountNBO));
|
|
val_num = PQfnumber (result,
|
|
val_name);
|
|
frac_num = PQfnumber (result,
|
|
frac_name);
|
|
curr_num = PQfnumber (result,
|
|
curr_name);
|
|
if ( (val_num < 0) ||
|
|
(frac_num < 0) ||
|
|
(curr_num < 0) )
|
|
{
|
|
GNUNET_break (0);
|
|
return GNUNET_SYSERR;
|
|
}
|
|
if ( (PQgetisnull (result,
|
|
row,
|
|
val_num)) ||
|
|
(PQgetisnull (result,
|
|
row,
|
|
frac_num)) ||
|
|
(PQgetisnull (result,
|
|
row,
|
|
curr_num)) )
|
|
{
|
|
GNUNET_break (0);
|
|
return GNUNET_NO;
|
|
}
|
|
/* Note that Postgres stores value in NBO internally,
|
|
so no conversion needed in this case */
|
|
r_amount_nbo->value = *(uint64_t *) PQgetvalue (result,
|
|
row,
|
|
val_num);
|
|
r_amount_nbo->fraction = *(uint32_t *) PQgetvalue (result,
|
|
row,
|
|
frac_num);
|
|
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;
|
|
}
|
|
|
|
|
|
/**
|
|
* Extract a currency amount from a query result according to the
|
|
* given specification.
|
|
*
|
|
* @param result the result to extract the amount from
|
|
* @param row which row of the result to extract the amount from (needed as
|
|
* results can have multiple rows)
|
|
* @param val_name name of the column with the amount's "value", must include
|
|
* the substring "_val".
|
|
* @param frac_name name of the column with the amount's "fractional" value,
|
|
* must include the substring "_frac".
|
|
* @param curr_name name of the column with the amount's currency name, must
|
|
* include the substring "_curr".
|
|
* @param[out] r_amount where to store the amount, in host byte order
|
|
* @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_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;
|
|
int ret;
|
|
|
|
ret = TALER_PQ_extract_amount_nbo (result,
|
|
row,
|
|
val_name,
|
|
frac_name,
|
|
curr_name,
|
|
&amount_nbo);
|
|
TALER_amount_ntoh (r_amount,
|
|
&amount_nbo);
|
|
return ret;
|
|
}
|
|
|
|
|
|
/* end of pq/db_pq.c */
|