1 files changed, 146 insertions, 0 deletions
diff --git a/src/backenddb/pg_lookup_pending_reserves.c b/src/backenddb/pg_lookup_pending_reserves.c
new file mode 100644
index 00000000..f35021c6
--- /dev/null
+++ b/src/backenddb/pg_lookup_pending_reserves.c
@@ -0,0 +1,146 @@
+/*
+   This file is part of TALER
+   Copyright (C) 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 backenddb/pg_lookup_pending_reserves.c
+ * @brief Implementation of the lookup_pending_reserves function for Postgres
+ * @author Iván Ávalos
+ */
+#include "platform.h"
+#include <taler/taler_error_codes.h>
+#include <taler/taler_dbevents.h>
+#include <taler/taler_pq_lib.h>
+#include "pg_lookup_pending_reserves.h"
+#include "pg_helper.h"
+
+/**
+ * Closure for #lookup_pending_reserves_cb.
+ */
+struct LookupPendingReservesContext
+{
+  /**
+   * Postgres context.
+   */
+  struct PostgresClosure *pg;
+
+  /**
+   * Function to call with the results
+   */
+  TALER_MERCHANTDB_PendingReservesCallback cb;
+
+  /**
+   * Closure for @e cb
+   */
+  void *cb_cls;
+
+  /**
+   * Set in case of errors.
+   */
+  enum GNUNET_DB_QueryStatus qs;
+
+};
+
+
+/**
+ * Function to be called with the results of a SELECT statement
+ * that has returned @a num_results results about accounts.
+ *
+ * @param[in,out] cls of type `struct LookupReservesContext *`
+ * @param result the postgres result
+ * @param num_results the number of results in @a result
+ */
+static void
+lookup_pending_reserves_cb (void *cls,
+                            PGresult *result,
+                            unsigned int num_results)
+{
+  struct LookupPendingReservesContext *lrc = cls;
+
+  for (unsigned int i = 0; i < num_results; i++)
+  {
+    struct TALER_ReservePublicKeyP reserve_pub;
+    struct TALER_Amount merchant_initial_balance;
+    char *exchange_url;
+    char *instance_id;
+    struct GNUNET_PQ_ResultSpec rs[] = {
+      GNUNET_PQ_result_spec_auto_from_type ("reserve_pub",
+                                            &reserve_pub),
+      GNUNET_PQ_result_spec_string ("merchant_id",
+                                    &instance_id),
+      GNUNET_PQ_result_spec_string ("exchange_url",
+                                    &exchange_url),
+      TALER_PQ_result_spec_amount_with_currency ("merchant_initial_balance",
+                                                 &merchant_initial_balance),
+      GNUNET_PQ_result_spec_end
+    };
+
+    if (GNUNET_OK !=
+        GNUNET_PQ_extract_result (result,
+                                  rs,
+                                  i))
+    {
+      GNUNET_break (0);
+      lrc->qs = GNUNET_DB_STATUS_HARD_ERROR;
+      return;
+    }
+    lrc->cb (lrc->cb_cls,
+             instance_id,
+             exchange_url,
+             &reserve_pub,
+             &merchant_initial_balance);
+    GNUNET_PQ_cleanup_result (rs);
+  }
+}
+
+
+enum GNUNET_DB_QueryStatus
+TMH_PG_lookup_pending_reserves (void *cls,
+                                TALER_MERCHANTDB_PendingReservesCallback cb,
+                                void *cb_cls)
+{
+  struct PostgresClosure *pg = cls;
+  struct LookupPendingReservesContext lrc = {
+    .pg = pg,
+    .cb = cb,
+    .cb_cls = cb_cls
+  };
+  struct GNUNET_PQ_QueryParam params[] = {
+    GNUNET_PQ_query_param_end
+  };
+  enum GNUNET_DB_QueryStatus qs;
+
+  check_connection (pg);
+  PREPARE (pg,
+           "lookup_pending_reserves",
+           "SELECT"
+           " reserve_pub"
+           ",merchant_id"
+           ",exchange_url"
+           ",merchant_initial_balance"
+           " FROM merchant_reward_reserves mrr"
+           " JOIN merchant_instances USING (merchant_serial)"
+           " JOIN merchant_reward_reserve_keys USING (reserve_serial)"
+           " WHERE (mrr.exchange_initial_balance).val=0"
+           "   AND (mrr.exchange_initial_balance).frac=0");
+
+  qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
+                                             "lookup_pending_reserves",
+                                             params,
+                                             &lookup_pending_reserves_cb,
+                                             &lrc);
+  if (lrc.qs < 0)
+    return lrc.qs;
+  return qs;
+}