143 lines
3.9 KiB
C
143 lines
3.9 KiB
C
/*
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This file is part of TALER
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Copyright (C) 2022 Taler Systems SA
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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 exchangedb/pg_wire_prepare_data_get.c
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* @brief Implementation of the wire_prepare_data_get function for Postgres
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* @author Christian Grothoff
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*/
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#include "platform.h"
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#include "taler_error_codes.h"
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#include "taler_dbevents.h"
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#include "taler_pq_lib.h"
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#include "pg_wire_prepare_data_get.h"
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#include "pg_helper.h"
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/**
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* Closure for #prewire_cb().
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*/
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struct PrewireContext
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{
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/**
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* Function to call on each result.
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*/
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TALER_EXCHANGEDB_WirePreparationIterator cb;
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/**
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* Closure for @a cb.
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*/
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void *cb_cls;
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/**
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* #GNUNET_OK if everything went fine.
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*/
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enum GNUNET_GenericReturnValue status;
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};
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/**
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* Invoke the callback for each result.
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*
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* @param cls a `struct MissingWireContext *`
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* @param result SQL result
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* @param num_results number of rows in @a result
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*/
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static void
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prewire_cb (void *cls,
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PGresult *result,
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unsigned int num_results)
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{
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struct PrewireContext *pc = cls;
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for (unsigned int i = 0; i < num_results; i++)
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{
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uint64_t prewire_uuid;
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char *wire_method;
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void *buf = NULL;
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size_t buf_size;
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struct GNUNET_PQ_ResultSpec rs[] = {
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GNUNET_PQ_result_spec_uint64 ("prewire_uuid",
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&prewire_uuid),
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GNUNET_PQ_result_spec_string ("wire_method",
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&wire_method),
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GNUNET_PQ_result_spec_variable_size ("buf",
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&buf,
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&buf_size),
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GNUNET_PQ_result_spec_end
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};
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if (GNUNET_OK !=
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GNUNET_PQ_extract_result (result,
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rs,
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i))
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{
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GNUNET_break (0);
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pc->status = GNUNET_SYSERR;
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return;
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}
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pc->cb (pc->cb_cls,
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prewire_uuid,
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wire_method,
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buf,
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buf_size);
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GNUNET_PQ_cleanup_result (rs);
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}
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}
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enum GNUNET_DB_QueryStatus
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TEH_PG_wire_prepare_data_get (void *cls,
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uint64_t start_row,
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uint64_t limit,
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TALER_EXCHANGEDB_WirePreparationIterator cb,
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void *cb_cls)
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{
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struct PostgresClosure *pg = cls;
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struct GNUNET_PQ_QueryParam params[] = {
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GNUNET_PQ_query_param_uint64 (&start_row),
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GNUNET_PQ_query_param_uint64 (&limit),
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GNUNET_PQ_query_param_end
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};
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struct PrewireContext pc = {
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.cb = cb,
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.cb_cls = cb_cls,
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.status = GNUNET_OK
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};
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enum GNUNET_DB_QueryStatus qs;
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/* Used in #postgres_wire_prepare_data_get() */
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PREPARE (pg,
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"wire_prepare_data_get",
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"SELECT"
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" prewire_uuid"
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",wire_method"
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",buf"
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" FROM prewire"
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" WHERE prewire_uuid >= $1"
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" AND finished=FALSE"
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" AND failed=FALSE"
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" ORDER BY prewire_uuid ASC"
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" LIMIT $2;");
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qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
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"wire_prepare_data_get",
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params,
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&prewire_cb,
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&pc);
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if (GNUNET_OK != pc.status)
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return GNUNET_DB_STATUS_HARD_ERROR;
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return qs;
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}
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