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/*
This file is part of TALER
Copyright (C) 2022 Taler Systems SA
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
TALER is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file exchangedb/pg_wire_prepare_data_get.c
* @brief Implementation of the wire_prepare_data_get function for Postgres
* @author Christian Grothoff
*/
#include "platform.h"
#include "taler_error_codes.h"
#include "taler_dbevents.h"
#include "taler_pq_lib.h"
#include "pg_wire_prepare_data_get.h"
#include "pg_helper.h"
/**
* Closure for #prewire_cb().
*/
struct PrewireContext
{
/**
* Function to call on each result.
*/
TALER_EXCHANGEDB_WirePreparationIterator cb;
/**
* Closure for @a cb.
*/
void *cb_cls;
/**
* #GNUNET_OK if everything went fine.
*/
enum GNUNET_GenericReturnValue status;
};
/**
* Invoke the callback for each result.
*
* @param cls a `struct MissingWireContext *`
* @param result SQL result
* @param num_results number of rows in @a result
*/
static void
prewire_cb (void *cls,
PGresult *result,
unsigned int num_results)
{
struct PrewireContext *pc = cls;
for (unsigned int i = 0; i < num_results; i++)
{
uint64_t prewire_uuid;
char *wire_method;
void *buf = NULL;
size_t buf_size;
struct GNUNET_PQ_ResultSpec rs[] = {
GNUNET_PQ_result_spec_uint64 ("prewire_uuid",
&prewire_uuid),
GNUNET_PQ_result_spec_string ("wire_method",
&wire_method),
GNUNET_PQ_result_spec_variable_size ("buf",
&buf,
&buf_size),
GNUNET_PQ_result_spec_end
};
if (GNUNET_OK !=
GNUNET_PQ_extract_result (result,
rs,
i))
{
GNUNET_break (0);
pc->status = GNUNET_SYSERR;
return;
}
pc->cb (pc->cb_cls,
prewire_uuid,
wire_method,
buf,
buf_size);
GNUNET_PQ_cleanup_result (rs);
}
}
enum GNUNET_DB_QueryStatus
TEH_PG_wire_prepare_data_get (void *cls,
uint64_t start_row,
uint64_t limit,
TALER_EXCHANGEDB_WirePreparationIterator cb,
void *cb_cls)
{
struct PostgresClosure *pg = cls;
struct GNUNET_PQ_QueryParam params[] = {
GNUNET_PQ_query_param_uint64 (&start_row),
GNUNET_PQ_query_param_uint64 (&limit),
GNUNET_PQ_query_param_end
};
struct PrewireContext pc = {
.cb = cb,
.cb_cls = cb_cls,
.status = GNUNET_OK
};
enum GNUNET_DB_QueryStatus qs;
/* Used in #postgres_wire_prepare_data_get() */
PREPARE (pg,
"wire_prepare_data_get",
"SELECT"
" prewire_uuid"
",wire_method"
",buf"
" FROM prewire"
" WHERE prewire_uuid >= $1"
" AND finished=FALSE"
" AND failed=FALSE"
" ORDER BY prewire_uuid ASC"
" LIMIT $2;");
qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
"wire_prepare_data_get",
params,
&prewire_cb,
&pc);
if (GNUNET_OK != pc.status)
return GNUNET_DB_STATUS_HARD_ERROR;
return qs;
}
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