374 lines
9.7 KiB
C
374 lines
9.7 KiB
C
/*
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This file is part of TALER
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Copyright (C) 2014, 2015, 2016 GNUnet e.V.
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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, see <http://www.gnu.org/licenses/>
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*/
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/**
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* @file pq/pq_result_helper.c
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* @brief functions to initialize parameter arrays
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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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* Extract a currency amount from a query result according to the
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* given specification.
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*
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* @param result the result to extract the amount from
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* @param row which row of the result to extract the amount from (needed as results can have multiple rows)
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* @param val_name name of the column with the amount's "value", must include the substring "_val".
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* @param frac_name name of the column with the amount's "fractional" value, must include the substring "_frac".
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* @param curr_name name of the column with the amount's currency name, must include the substring "_curr".
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* @param[out] r_amount_nbo where to store the amount, in network byte order
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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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static int
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extract_amount_nbo_helper (PGresult *result,
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int row,
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const char *val_name,
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const char *frac_name,
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const char *curr_name,
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struct TALER_AmountNBO *r_amount_nbo)
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{
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int val_num;
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int frac_num;
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int curr_num;
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int len;
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/* These checks are simply to check that clients obey by our naming
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conventions, and not for any functional reason */
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GNUNET_assert (NULL !=
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strstr (val_name,
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"_val"));
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GNUNET_assert (NULL !=
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strstr (frac_name,
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"_frac"));
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GNUNET_assert (NULL !=
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strstr (curr_name,
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"_curr"));
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/* Set return value to invalid in case we don't finish */
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memset (r_amount_nbo,
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0,
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sizeof (struct TALER_AmountNBO));
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val_num = PQfnumber (result,
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val_name);
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frac_num = PQfnumber (result,
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frac_name);
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curr_num = PQfnumber (result,
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curr_name);
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if (val_num < 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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val_name);
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return GNUNET_SYSERR;
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}
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if (frac_num < 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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frac_name);
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return GNUNET_SYSERR;
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}
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if (curr_num < 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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curr_name);
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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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val_num)) ||
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(PQgetisnull (result,
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row,
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frac_num)) ||
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(PQgetisnull (result,
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row,
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curr_num)) )
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{
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GNUNET_break (0);
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return GNUNET_NO;
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}
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/* Note that Postgres stores value in NBO internally,
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so no conversion needed in this case */
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r_amount_nbo->value = *(uint64_t *) PQgetvalue (result,
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row,
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val_num);
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r_amount_nbo->fraction = *(uint32_t *) PQgetvalue (result,
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row,
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frac_num);
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len = GNUNET_MIN (TALER_CURRENCY_LEN - 1,
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PQgetlength (result,
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row,
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curr_num));
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memcpy (r_amount_nbo->currency,
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PQgetvalue (result,
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row,
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curr_num),
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len);
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return GNUNET_OK;
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}
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/**
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* Extract data from a Postgres database @a result at row @a row.
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*
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* @param cls closure
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* @param result where to extract data from
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* @param int row to extract data from
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* @param fname name (or prefix) of the fields to extract from
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* @param[in,out] dst_size where to store size of result, may be NULL
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* @param[out] dst where to store the result
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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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static int
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extract_amount_nbo (void *cls,
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PGresult *result,
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int row,
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const char *fname,
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size_t *dst_size,
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void *dst)
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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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int ret;
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GNUNET_asprintf (&val_name,
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"%s_val",
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fname);
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GNUNET_asprintf (&frac_name,
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"%s_frac",
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fname);
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GNUNET_asprintf (&curr_name,
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"%s_curr",
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fname);
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ret = extract_amount_nbo_helper (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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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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return ret;
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}
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/**
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* Currency amount expected.
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*
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* @param name name of the field in the table
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* @param[out] amount where to store the result
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* @return array entry for the result specification to use
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*/
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struct GNUNET_PQ_ResultSpec
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TALER_PQ_result_spec_amount_nbo (const char *name,
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struct TALER_AmountNBO *amount)
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{
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struct GNUNET_PQ_ResultSpec res =
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{ &extract_amount_nbo, NULL, NULL,
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(void *) amount, sizeof (*amount),
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name, NULL };
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return res;
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}
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/**
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* Extract data from a Postgres database @a result at row @a row.
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*
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* @param cls closure
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* @param result where to extract data from
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* @param int row to extract data from
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* @param fname name (or prefix) of the fields to extract from
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* @param[in,out] dst_size where to store size of result, may be NULL
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* @param[out] dst where to store the result
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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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static int
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extract_amount (void *cls,
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PGresult *result,
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int row,
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const char *fname,
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size_t *dst_size,
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void *dst)
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{
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struct TALER_Amount *r_amount = dst;
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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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struct TALER_AmountNBO amount_nbo;
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int ret;
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GNUNET_asprintf (&val_name,
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"%s_val",
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fname);
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GNUNET_asprintf (&frac_name,
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"%s_frac",
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fname);
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GNUNET_asprintf (&curr_name,
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"%s_curr",
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fname);
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ret = extract_amount_nbo_helper (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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&amount_nbo);
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TALER_amount_ntoh (r_amount,
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&amount_nbo);
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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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return ret;
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}
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/**
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* Currency amount expected.
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*
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* @param name name of the field in the table
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* @param[out] amount where to store the result
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* @return array entry for the result specification to use
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*/
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struct GNUNET_PQ_ResultSpec
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TALER_PQ_result_spec_amount (const char *name,
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struct TALER_Amount *amount)
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{
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struct GNUNET_PQ_ResultSpec res =
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{ &extract_amount, NULL, NULL,
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(void *) amount, sizeof (*amount),
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name, NULL };
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return res;
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}
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/**
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* Extract data from a Postgres database @a result at row @a row.
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*
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* @param cls closure
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* @param result where to extract data from
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* @param int row to extract data from
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* @param fname name (or prefix) of the fields to extract from
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* @param[in,out] dst_size where to store size of result, may be NULL
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* @param[out] dst where to store the result
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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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static int
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extract_json (void *cls,
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PGresult *result,
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int row,
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const char *fname,
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size_t *dst_size,
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void *dst)
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{
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json_t **j_dst = dst;
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const char *res;
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int fnum;
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json_error_t json_error;
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size_t slen;
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fnum = PQfnumber (result,
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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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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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return GNUNET_NO;
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slen = PQgetlength (result,
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row,
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fnum);
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res = (const char *) PQgetvalue (result,
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row,
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fnum);
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*j_dst = json_loadb (res,
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slen,
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JSON_REJECT_DUPLICATES,
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&json_error);
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if (NULL == *j_dst)
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{
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GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
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"Failed to parse JSON result for field `%s': %s (%s)\n",
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fname,
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json_error.text,
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json_error.source);
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return GNUNET_SYSERR;
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}
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return GNUNET_OK;
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}
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/**
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* Function called to clean up memory allocated
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* by a #GNUNET_PQ_ResultConverter.
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*
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* @param cls closure
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* @param rd result data to clean up
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*/
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static void
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clean_json (void *cls,
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void *rd)
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{
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json_t **dst = rd;
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if (NULL != *dst)
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{
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json_decref (*dst);
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*dst = NULL;
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}
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}
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/**
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* json_t expected.
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*
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* @param name name of the field in the table
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* @param[out] jp where to store the result
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* @return array entry for the result specification to use
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*/
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struct GNUNET_PQ_ResultSpec
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TALER_PQ_result_spec_json (const char *name,
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json_t **jp)
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{
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struct GNUNET_PQ_ResultSpec res =
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{ &extract_json, &clean_json, NULL,
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(void *) jp, 0,
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name, NULL };
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return res;
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}
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/* end of pq_result_helper.c */
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