1 files changed, 143 insertions, 0 deletions
diff --git a/src/exchangedb/pg_select_refunds_by_coin.c b/src/exchangedb/pg_select_refunds_by_coin.c
new file mode 100644
index 000000000..d9cd6dd3c
--- /dev/null
+++ b/src/exchangedb/pg_select_refunds_by_coin.c
@@ -0,0 +1,143 @@
+/*
+   This file is part of TALER
+   Copyright (C) 2022-2023 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_select_refunds_by_coin.c
+ * @brief Implementation of the select_refunds_by_coin 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_select_refunds_by_coin.h"
+#include "pg_helper.h"
+
+
+/**
+ * Closure for #get_refunds_cb().
+ */
+struct SelectRefundContext
+{
+  /**
+   * Function to call on each result.
+   */
+  TALER_EXCHANGEDB_RefundCoinCallback cb;
+
+  /**
+   * Closure for @a cb.
+   */
+  void *cb_cls;
+
+  /**
+   * Plugin context.
+   */
+  struct PostgresClosure *pg;
+
+  /**
+   * Set to #GNUNET_SYSERR on error.
+   */
+  enum GNUNET_GenericReturnValue status;
+};
+
+
+/**
+ * Function to be called with the results of a SELECT statement
+ * that has returned @a num_results results.
+ *
+ * @param cls closure of type `struct SelectRefundContext *`
+ * @param result the postgres result
+ * @param num_results the number of results in @a result
+ */
+static void
+get_refunds_cb (void *cls,
+                PGresult *result,
+                unsigned int num_results)
+{
+  struct SelectRefundContext *srctx = cls;
+  struct PostgresClosure *pg = srctx->pg;
+
+  for (unsigned int i = 0; i<num_results; i++)
+  {
+    struct TALER_Amount amount_with_fee;
+    struct GNUNET_PQ_ResultSpec rs[] = {
+      TALER_PQ_RESULT_SPEC_AMOUNT ("amount_with_fee",
+                                   &amount_with_fee),
+      GNUNET_PQ_result_spec_end
+    };
+
+    if (GNUNET_OK !=
+        GNUNET_PQ_extract_result (result,
+                                  rs,
+                                  i))
+    {
+      GNUNET_break (0);
+      srctx->status = GNUNET_SYSERR;
+      return;
+    }
+    if (GNUNET_OK !=
+        srctx->cb (srctx->cb_cls,
+                   &amount_with_fee))
+      return;
+  }
+}
+
+
+enum GNUNET_DB_QueryStatus
+TEH_PG_select_refunds_by_coin (
+  void *cls,
+  const struct TALER_CoinSpendPublicKeyP *coin_pub,
+  const struct TALER_MerchantPublicKeyP *merchant_pub,
+  const struct TALER_PrivateContractHashP *h_contract,
+  TALER_EXCHANGEDB_RefundCoinCallback cb,
+  void *cb_cls)
+{
+  struct PostgresClosure *pg = cls;
+  enum GNUNET_DB_QueryStatus qs;
+  struct GNUNET_PQ_QueryParam params[] = {
+    GNUNET_PQ_query_param_auto_from_type (coin_pub),
+    GNUNET_PQ_query_param_auto_from_type (merchant_pub),
+    GNUNET_PQ_query_param_auto_from_type (h_contract),
+    GNUNET_PQ_query_param_end
+  };
+  struct SelectRefundContext srctx = {
+    .cb = cb,
+    .cb_cls = cb_cls,
+    .pg = pg,
+    .status = GNUNET_OK
+  };
+  const char *query = "get_refunds_by_coin_and_contract";
+
+  PREPARE (pg,
+           query,
+           "SELECT"
+           "   ref.amount_with_fee"
+           " FROM refunds ref"
+           " JOIN coin_deposits cdep"
+           "   USING (coin_pub,batch_deposit_serial_id)"
+           " JOIN batch_deposits bdep"
+           "   ON (ref.batch_deposit_serial_id = bdep.batch_deposit_serial_id)"
+           " WHERE ref.coin_pub=$1"
+           "   AND bdep.merchant_pub=$2"
+           "   AND bdep.h_contract_terms=$3;");
+  qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
+                                             query,
+                                             params,
+                                             &get_refunds_cb,
+                                             &srctx);
+  if (GNUNET_SYSERR == srctx.status)
+    return GNUNET_DB_STATUS_HARD_ERROR;
+  return qs;
+}