332 lines
10 KiB
C
332 lines
10 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_query_helper.c
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* @brief helper functions for Taler-specific 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 <gnunet/gnunet_pq_lib.h>
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#include "taler_pq_lib.h"
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/**
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* Function called to convert input argument into SQL parameters.
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*
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* @param cls closure
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* @param data pointer to input argument, here a `struct TALER_AmountNBO`
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* @param data_len number of bytes in @a data (if applicable)
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* @param[out] param_values SQL data to set
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* @param[out] param_lengths SQL length data to set
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* @param[out] param_formats SQL format data to set
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* @param param_length number of entries available in the @a param_values, @a param_lengths and @a param_formats arrays
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* @param[out] scratch buffer for dynamic allocations (to be done via GNUNET_malloc()
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* @param scratch_length number of entries left in @a scratch
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* @return -1 on error, number of offsets used in @a scratch otherwise
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*/
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static int
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qconv_amount_nbo (void *cls,
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const void *data,
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size_t data_len,
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void *param_values[],
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int param_lengths[],
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int param_formats[],
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unsigned int param_length,
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void *scratch[],
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unsigned int scratch_length)
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{
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const struct TALER_AmountNBO *amount = data;
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unsigned int off = 0;
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GNUNET_assert (3 == param_length);
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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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return 0;
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}
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/**
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* Generate query parameter for a currency, consisting of the three
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* components "value", "fraction" and "currency" in this order. The
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* types must be a 64-bit integer, 32-bit integer and a
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* #TALER_CURRENCY_LEN-sized BLOB/VARCHAR respectively.
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*
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* @param x pointer to the query parameter to pass
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* @return array entry for the query parameters to use
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*/
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struct GNUNET_PQ_QueryParam
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TALER_PQ_query_param_amount_nbo (const struct TALER_AmountNBO *x)
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{
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struct GNUNET_PQ_QueryParam res =
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{ &qconv_amount_nbo, NULL, x, sizeof (*x), 3 };
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return res;
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}
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/**
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* Function called to convert input argument into SQL parameters.
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*
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* @param cls closure
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* @param data pointer to input argument, here a `struct TALER_Amount`
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* @param data_len number of bytes in @a data (if applicable)
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* @param[out] param_values SQL data to set
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* @param[out] param_lengths SQL length data to set
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* @param[out] param_formats SQL format data to set
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* @param param_length number of entries available in the @a param_values, @a param_lengths and @a param_formats arrays
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* @param[out] scratch buffer for dynamic allocations (to be done via GNUNET_malloc()
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* @param scratch_length number of entries left in @a scratch
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* @return -1 on error, number of offsets used in @a scratch otherwise
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*/
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static int
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qconv_amount (void *cls,
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const void *data,
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size_t data_len,
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void *param_values[],
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int param_lengths[],
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int param_formats[],
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unsigned int param_length,
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void *scratch[],
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unsigned int scratch_length)
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{
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const struct TALER_Amount *amount_hbo = data;
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struct TALER_AmountNBO *amount;
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amount = GNUNET_new (struct TALER_AmountNBO);
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scratch[0] = amount;
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TALER_amount_hton (amount,
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amount_hbo);
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qconv_amount_nbo (cls,
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amount,
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sizeof (struct TALER_AmountNBO),
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param_values,
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param_lengths,
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param_formats,
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param_length,
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&scratch[1],
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scratch_length - 1);
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return 1;
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}
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/**
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* Generate query parameter for a currency, consisting of the three
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* components "value", "fraction" and "currency" in this order. The
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* types must be a 64-bit integer, 32-bit integer and a
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* #TALER_CURRENCY_LEN-sized BLOB/VARCHAR respectively.
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*
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* @param x pointer to the query parameter to pass
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* @return array entry for the query parameters to use
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*/
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struct GNUNET_PQ_QueryParam
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TALER_PQ_query_param_amount (const struct TALER_Amount *x)
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{
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struct GNUNET_PQ_QueryParam res =
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{ &qconv_amount, NULL, x, sizeof (*x), 3 };
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return res;
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}
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/**
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* Function called to convert input argument into SQL parameters.
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*
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* @param cls closure
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* @param data pointer to input argument, here a `json_t *`
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* @param data_len number of bytes in @a data (if applicable)
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* @param[out] param_values SQL data to set
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* @param[out] param_lengths SQL length data to set
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* @param[out] param_formats SQL format data to set
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* @param param_length number of entries available in the @a param_values, @a param_lengths and @a param_formats arrays
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* @param[out] scratch buffer for dynamic allocations (to be done via GNUNET_malloc()
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* @param scratch_length number of entries left in @a scratch
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* @return -1 on error, number of offsets used in @a scratch otherwise
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*/
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static int
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qconv_json (void *cls,
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const void *data,
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size_t data_len,
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void *param_values[],
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int param_lengths[],
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int param_formats[],
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unsigned int param_length,
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void *scratch[],
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unsigned int scratch_length)
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{
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const json_t *json = data;
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char *str;
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str = json_dumps (json, JSON_COMPACT);
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if (NULL == str)
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return -1;
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scratch[0] = str;
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param_values[0] = (void *) str;
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param_lengths[0] = strlen (str);
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param_formats[0] = 1;
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return 1;
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}
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/**
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* Generate query parameter for a JSON object (stored as a string
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* in the DB).
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*
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* @param x pointer to the json object to pass
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*/
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struct GNUNET_PQ_QueryParam
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TALER_PQ_query_param_json (const json_t *x)
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{
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struct GNUNET_PQ_QueryParam res =
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{ &qconv_json, NULL, x, 0, 1 };
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return res;
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}
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/**
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* Function called to convert input argument into SQL parameters.
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*
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* @param cls closure
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* @param data pointer to input argument
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* @param data_len number of bytes in @a data (if applicable)
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* @param[out] param_values SQL data to set
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* @param[out] param_lengths SQL length data to set
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* @param[out] param_formats SQL format data to set
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* @param param_length number of entries available in the @a param_values, @a param_lengths and @a param_formats arrays
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* @param[out] scratch buffer for dynamic allocations (to be done via #GNUNET_malloc()
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* @param scratch_length number of entries left in @a scratch
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* @return -1 on error, number of offsets used in @a scratch otherwise
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*/
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static int
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qconv_round_time (void *cls,
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const void *data,
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size_t data_len,
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void *param_values[],
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int param_lengths[],
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int param_formats[],
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unsigned int param_length,
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void *scratch[],
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unsigned int scratch_length)
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{
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const struct GNUNET_TIME_Absolute *at = data;
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struct GNUNET_TIME_Absolute tmp;
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struct GNUNET_TIME_AbsoluteNBO *buf;
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GNUNET_break (NULL == cls);
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if (1 != param_length)
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return -1;
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tmp = *at;
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GNUNET_assert (GNUNET_OK ==
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GNUNET_TIME_round_abs (&tmp));
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buf = GNUNET_new (struct GNUNET_TIME_AbsoluteNBO);
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*buf = GNUNET_TIME_absolute_hton (tmp);
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scratch[0] = buf;
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param_values[0] = (void *) buf;
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param_lengths[0] = sizeof (struct GNUNET_TIME_AbsoluteNBO);
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param_formats[0] = 1;
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return 1;
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}
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/**
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* Generate query parameter for an absolute time value.
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* In contrast to
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* #GNUNET_PQ_query_param_absolute_time(), this function
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* will abort (!) if the time given is not rounded!
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* The database must store a 64-bit integer.
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*
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* @param x pointer to the query parameter to pass
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* @return array entry for the query parameters to use
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*/
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struct GNUNET_PQ_QueryParam
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TALER_PQ_query_param_absolute_time (const struct GNUNET_TIME_Absolute *x)
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{
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struct GNUNET_PQ_QueryParam res =
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{ &qconv_round_time, NULL, x, sizeof (*x), 1 };
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return res;
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}
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/**
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* Function called to convert input argument into SQL parameters.
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*
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* @param cls closure
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* @param data pointer to input argument
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* @param data_len number of bytes in @a data (if applicable)
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* @param[out] param_values SQL data to set
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* @param[out] param_lengths SQL length data to set
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* @param[out] param_formats SQL format data to set
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* @param param_length number of entries available in the @a param_values, @a param_lengths and @a param_formats arrays
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* @param[out] scratch buffer for dynamic allocations (to be done via #GNUNET_malloc()
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* @param scratch_length number of entries left in @a scratch
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* @return -1 on error, number of offsets used in @a scratch otherwise
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*/
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static int
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qconv_round_time_abs (void *cls,
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const void *data,
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size_t data_len,
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void *param_values[],
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int param_lengths[],
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int param_formats[],
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unsigned int param_length,
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void *scratch[],
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unsigned int scratch_length)
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{
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const struct GNUNET_TIME_AbsoluteNBO *at = data;
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struct GNUNET_TIME_Absolute tmp;
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GNUNET_break (NULL == cls);
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if (1 != param_length)
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return -1;
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tmp = GNUNET_TIME_absolute_ntoh (*at);
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GNUNET_assert (GNUNET_OK ==
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GNUNET_TIME_round_abs (&tmp));
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param_values[0] = (void *) at;
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param_lengths[0] = sizeof (struct GNUNET_TIME_AbsoluteNBO);
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param_formats[0] = 1;
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return 0;
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}
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/**
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* Generate query parameter for an absolute time value.
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* In contrast to
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* #GNUNET_PQ_query_param_absolute_time(), this function
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* will abort (!) if the time given is not rounded!
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* The database must store a 64-bit integer.
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*
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* @param x pointer to the query parameter to pass
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*/
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struct GNUNET_PQ_QueryParam
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TALER_PQ_query_param_absolute_time_nbo(const struct GNUNET_TIME_AbsoluteNBO *x)
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{
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struct GNUNET_PQ_QueryParam res =
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{ &qconv_round_time_abs, NULL, x, sizeof (*x), 1 };
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return res;
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}
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/* end of pq/pq_query_helper.c */
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