get_fountain_withdraw.h (2686B)
1 /* 2 This file is part of TALER 3 Copyright (C) 2026 Taler Systems SA 4 5 TALER is free software; you can redistribute it and/or modify it under the 6 terms of the GNU General Public License as published by the Free Software 7 Foundation; either version 3, or (at your option) any later version. 8 9 TALER is distributed in the hope that it will be useful, but WITHOUT ANY 10 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR 11 A PARTICULAR PURPOSE. See the GNU General Public License for more details. 12 13 You should have received a copy of the GNU General Public License along with 14 TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>. 15 */ 16 /** 17 * @file src/include/merchant-database/get_fountain_withdraw.h 18 * @brief look up the signatures of a completed fountain withdrawal 19 */ 20 #ifndef MERCHANT_DATABASE_GET_FOUNTAIN_WITHDRAW_H 21 #define MERCHANT_DATABASE_GET_FOUNTAIN_WITHDRAW_H 22 #include "merchantdb_lib.h" 23 24 /** 25 * Called once per stored signature, ordered by grant and then by 26 * position within the grant, so the response can be rebuilt by 27 * appending. 28 * 29 * @param cls closure 30 * @param grant_index offset of the grant in the original request 31 * @param token_family_slug token family the grant refers to 32 * @param h_issue hash of the issue key the signature was made with 33 * @param blind_sig the blind signature handed out originally 34 */ 35 typedef void 36 (*TALER_MERCHANTDB_FountainWithdrawSigCallback)( 37 void *cls, 38 uint32_t grant_index, 39 const char *token_family_slug, 40 const struct TALER_TokenIssuePublicKeyHashP *h_issue, 41 const struct GNUNET_CRYPTO_BlindedSignature *blind_sig); 42 43 /** 44 * Lock the fountain and hand back the signatures of an earlier 45 * withdrawal of the same request, if there was one. Must run in a 46 * READ COMMITTED transaction. The lock is held until commit or 47 * rollback; looking the signatures up after taking it is what makes a 48 * concurrent withdrawal of the same request visible here instead of 49 * being counted twice. 50 * 51 * @param pg database context with the instance selected 52 * @param fountain_serial authenticated fountain 53 * @param h_request hash of the request's grants array 54 * @param[out] not_found true if the fountain was deleted 55 * @param cb called for each stored signature, in response order 56 * @param cb_cls closure for @a cb 57 * @return database result code; no result if the request is new 58 */ 59 enum GNUNET_DB_QueryStatus 60 TALER_MERCHANTDB_get_fountain_withdraw ( 61 struct TALER_MERCHANTDB_PostgresContext *pg, 62 uint64_t fountain_serial, 63 const struct GNUNET_HashCode *h_request, 64 bool *not_found, 65 TALER_MERCHANTDB_FountainWithdrawSigCallback cb, 66 void *cb_cls); 67 68 #endif