1 files changed, 69 insertions, 0 deletions
diff --git a/src/exchangedb/pg_get_coin_denomination.c b/src/exchangedb/pg_get_coin_denomination.c
new file mode 100644
index 000000000..9f9256f6f
--- /dev/null
+++ b/src/exchangedb/pg_get_coin_denomination.c
@@ -0,0 +1,69 @@
+/*
+   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_get_coin_denomination.c
+ * @brief Implementation of the get_coin_denomination 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_get_coin_denomination.h"
+#include "pg_helper.h"
+
+enum GNUNET_DB_QueryStatus
+TEH_PG_get_coin_denomination (
+  void *cls,
+  const struct TALER_CoinSpendPublicKeyP *coin_pub,
+  uint64_t *known_coin_id,
+  struct TALER_DenominationHashP *denom_hash)
+{
+  struct PostgresClosure *pg = cls;
+  struct GNUNET_PQ_QueryParam params[] = {
+    GNUNET_PQ_query_param_auto_from_type (coin_pub),
+    GNUNET_PQ_query_param_end
+  };
+  struct GNUNET_PQ_ResultSpec rs[] = {
+    GNUNET_PQ_result_spec_auto_from_type ("denom_pub_hash",
+                                          denom_hash),
+    GNUNET_PQ_result_spec_uint64 ("known_coin_id",
+                                  known_coin_id),
+    GNUNET_PQ_result_spec_end
+  };
+
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Getting coin denomination of coin %s\n",
+              TALER_B2S (coin_pub));
+
+  /* Used in #postgres_get_coin_denomination() to fetch
+     the denomination public key hash for
+     a coin known to the exchange. */
+  PREPARE (pg,
+           "get_coin_denomination",
+           "SELECT"
+           " denominations.denom_pub_hash"
+           ",known_coin_id"
+           " FROM known_coins"
+           " JOIN denominations USING (denominations_serial)"
+           " WHERE coin_pub=$1"
+           " FOR SHARE;");
+
+  return GNUNET_PQ_eval_prepared_singleton_select (pg->conn,
+                                                   "get_coin_denomination",
+                                                   params,
+                                                   rs);
+}