diff options
Diffstat (limited to 'src/exchangedb/pg_lookup_wire_fee_by_time.c')
-rw-r--r-- | src/exchangedb/pg_lookup_wire_fee_by_time.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/src/exchangedb/pg_lookup_wire_fee_by_time.c b/src/exchangedb/pg_lookup_wire_fee_by_time.c new file mode 100644 index 000000000..fdd6f8827 --- /dev/null +++ b/src/exchangedb/pg_lookup_wire_fee_by_time.c @@ -0,0 +1,158 @@ +/* + 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_lookup_wire_fee_by_time.c + * @brief Implementation of the lookup_wire_fee_by_time 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_lookup_wire_fee_by_time.h" +#include "pg_helper.h" + + +/** + * Closure for #wire_fee_by_time_helper() + */ +struct WireFeeLookupContext +{ + + /** + * Set to the wire fees. Set to invalid if fees conflict over + * the given time period. + */ + struct TALER_WireFeeSet *fees; + + /** + * Plugin context. + */ + struct PostgresClosure *pg; +}; + + +/** + * Helper function for #postgres_lookup_wire_fee_by_time(). + * Calls the callback with the wire fee structure. + * + * @param cls a `struct WireFeeLookupContext` + * @param result db results + * @param num_results number of results in @a result + */ +static void +wire_fee_by_time_helper (void *cls, + PGresult *result, + unsigned int num_results) +{ + struct WireFeeLookupContext *wlc = cls; + struct PostgresClosure *pg = wlc->pg; + + for (unsigned int i = 0; i<num_results; i++) + { + struct TALER_WireFeeSet fs; + struct GNUNET_PQ_ResultSpec rs[] = { + TALER_PQ_RESULT_SPEC_AMOUNT ("wire_fee", + &fs.wire), + TALER_PQ_RESULT_SPEC_AMOUNT ("closing_fee", + &fs.closing), + GNUNET_PQ_result_spec_end + }; + + if (GNUNET_OK != + GNUNET_PQ_extract_result (result, + rs, + i)) + { + GNUNET_break (0); + /* invalidate */ + memset (wlc->fees, + 0, + sizeof (struct TALER_WireFeeSet)); + return; + } + if (0 == i) + { + *wlc->fees = fs; + continue; + } + if (0 != + TALER_wire_fee_set_cmp (&fs, + wlc->fees)) + { + /* invalidate */ + memset (wlc->fees, + 0, + sizeof (struct TALER_WireFeeSet)); + return; + } + } +} + + +/** + * Lookup information about known wire fees. Finds all applicable + * fees in the given range. If they are identical, returns the + * respective @a fees. If any of the fees + * differ between @a start_time and @a end_time, the transaction + * succeeds BUT returns an invalid amount for both fees. + * + * @param cls closure + * @param wire_method the wire method to lookup fees for + * @param start_time starting time of fee + * @param end_time end time of fee + * @param[out] fees wire fees for that time period; if + * different fees exists within this time + * period, an 'invalid' amount is returned. + * @return transaction status code + */ +enum GNUNET_DB_QueryStatus +TEH_PG_lookup_wire_fee_by_time ( + void *cls, + const char *wire_method, + struct GNUNET_TIME_Timestamp start_time, + struct GNUNET_TIME_Timestamp end_time, + struct TALER_WireFeeSet *fees) +{ + struct PostgresClosure *pg = cls; + struct GNUNET_PQ_QueryParam params[] = { + GNUNET_PQ_query_param_string (wire_method), + GNUNET_PQ_query_param_timestamp (&start_time), + GNUNET_PQ_query_param_timestamp (&end_time), + GNUNET_PQ_query_param_end + }; + struct WireFeeLookupContext wlc = { + .fees = fees, + .pg = pg + }; + /* used in #postgres_lookup_wire_fee_by_time() */ + PREPARE (pg, + "lookup_wire_fee_by_time", + "SELECT" + " wire_fee_val" + ",wire_fee_frac" + ",closing_fee_val" + ",closing_fee_frac" + " FROM wire_fee" + " WHERE wire_method=$1" + " AND end_date > $2" + " AND start_date < $3;"); + return GNUNET_PQ_eval_prepared_multi_select (pg->conn, + "lookup_wire_fee_by_time", + params, + &wire_fee_by_time_helper, + &wlc); +} |