update_shard_progress.c (2772B)
1 /* 2 This file is part of TALER 3 Copyright (C) 2022, 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 exchangedb/update_shard_progress.c 18 * @brief Implementation of the update_shard_progress function for Postgres 19 * @author Christian Grothoff 20 */ 21 #include "taler/taler_pq_lib.h" 22 #include "exchange-database/update_shard_progress.h" 23 #include "helper.h" 24 25 26 enum GNUNET_DB_QueryStatus 27 TALER_EXCHANGEDB_update_shard_progress ( 28 struct TALER_EXCHANGEDB_PostgresContext *pg, 29 const char *job_name, 30 uint64_t start_row, 31 uint64_t end_row, 32 uint64_t progress_row, 33 struct GNUNET_TIME_Relative lease) 34 { 35 struct GNUNET_TIME_Absolute lease_until 36 = GNUNET_TIME_relative_to_absolute (lease); 37 struct GNUNET_PQ_QueryParam params[] = { 38 GNUNET_PQ_query_param_string (job_name), 39 GNUNET_PQ_query_param_uint64 (&start_row), 40 GNUNET_PQ_query_param_uint64 (&end_row), 41 GNUNET_PQ_query_param_uint64 (&progress_row), 42 GNUNET_PQ_query_param_absolute_time (&lease_until), 43 GNUNET_PQ_query_param_end 44 }; 45 46 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, 47 "Shard %s (%llu,%llu] progressed to %llu\n", 48 job_name, 49 (unsigned long long) start_row, 50 (unsigned long long) end_row, 51 (unsigned long long) progress_row); 52 /* GREATEST() keeps this monotonic: a worker that lost the shard to a second 53 one and only notices later must not push the marker back. Both the 54 'completed' flag and the lease renewal ride along on this one statement, 55 so a caller never needs a second round-trip (let alone a second 56 transaction) to say "and that was the last of it". */ 57 PREPARE (pg, 58 "update_shard_progress", 59 "UPDATE work_shards" 60 " SET progress_row=GREATEST(progress_row,$4)" 61 " ,completed=(GREATEST(progress_row,$4) >= end_row)" 62 " ,last_attempt=$5" 63 " WHERE job_name=$1" 64 " AND start_row=$2" 65 " AND end_row=$3;"); 66 return GNUNET_PQ_eval_prepared_non_select (pg->conn, 67 "update_shard_progress", 68 params); 69 }