1 files changed, 125 insertions, 0 deletions
diff --git a/src/backenddb/pg_lookup_transfer.c b/src/backenddb/pg_lookup_transfer.c
new file mode 100644
index 00000000..03c2ccce
--- /dev/null
+++ b/src/backenddb/pg_lookup_transfer.c
@@ -0,0 +1,125 @@
+/*
+   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_transfer.c
+ * @brief Implementation of the lookup_transfer 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_transfer.h"
+#include "pg_helper.h"
+
+enum GNUNET_DB_QueryStatus
+TMH_PG_lookup_transfer (void *cls,
+                        const char *instance_id,
+                        const char *exchange_url,
+                        const struct TALER_WireTransferIdentifierRawP *wtid,
+                        struct TALER_Amount *total_amount,
+                        struct TALER_Amount *wire_fee,
+                        struct TALER_Amount *exchange_amount,
+                        struct GNUNET_TIME_Timestamp *execution_time,
+                        bool *have_exchange_sig,
+                        bool *verified)
+{
+  struct PostgresClosure *pg = cls;
+  struct GNUNET_PQ_QueryParam params[] = {
+    GNUNET_PQ_query_param_string (exchange_url),
+    GNUNET_PQ_query_param_auto_from_type (wtid),
+    GNUNET_PQ_query_param_string (instance_id),
+    GNUNET_PQ_query_param_end
+  };
+  uint8_t verified8;
+  /** Amount we got actually credited, _excludes_ the wire fee */
+  bool no_sig;
+  struct TALER_Amount credit_amount;
+  struct GNUNET_PQ_ResultSpec rs[] = {
+    TALER_PQ_result_spec_amount_with_currency ("credit_amount",
+                                               &credit_amount),
+    GNUNET_PQ_result_spec_allow_null (
+      TALER_PQ_result_spec_amount_with_currency ("wire_fee",
+                                                 wire_fee),
+      &no_sig),
+    GNUNET_PQ_result_spec_allow_null (
+      TALER_PQ_result_spec_amount_with_currency ("exchange_amount",
+                                                 exchange_amount),
+      NULL),
+    GNUNET_PQ_result_spec_allow_null (
+      GNUNET_PQ_result_spec_timestamp ("execution_time",
+                                       execution_time),
+      NULL),
+    GNUNET_PQ_result_spec_auto_from_type ("verified",
+                                          &verified8),
+    GNUNET_PQ_result_spec_end
+  };
+  enum GNUNET_DB_QueryStatus qs;
+
+  check_connection (pg);
+  *execution_time = GNUNET_TIME_UNIT_ZERO_TS;
+
+  PREPARE (pg,
+           "lookup_transfer",
+           "SELECT"
+           " mt.credit_amount AS credit_amount"
+           ",mts.credit_amount AS exchange_amount"
+           ",wire_fee"
+           ",execution_time"
+           ",verified"
+           " FROM merchant_transfers mt"
+           "  JOIN merchant_accounts USING (account_serial)"
+           "  JOIN merchant_instances USING (merchant_serial)"
+           "  LEFT JOIN merchant_transfer_signatures mts USING (credit_serial)"
+           " WHERE wtid=$2"
+           "   AND exchange_url=$1"
+           "   AND merchant_id=$3;");
+
+  qs = GNUNET_PQ_eval_prepared_singleton_select (pg->conn,
+                                                 "lookup_transfer",
+                                                 params,
+                                                 rs);
+  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+              "Lookup transfer returned %d\n",
+              qs);
+  if (qs > 0)
+  {
+    *have_exchange_sig = ! no_sig;
+    *verified = (0 != verified8);
+    if (GNUNET_OK !=
+        TALER_amount_cmp_currency (&credit_amount,
+                                   wire_fee))
+    {
+      GNUNET_break (0);
+      return GNUNET_DB_STATUS_HARD_ERROR;
+    }
+    if ( (! no_sig) &&
+         (0 >
+          TALER_amount_add (total_amount,
+                            &credit_amount,
+                            wire_fee)) )
+    {
+      GNUNET_break (0);
+      return GNUNET_DB_STATUS_HARD_ERROR;
+    }
+  }
+  else
+  {
+    *verified = false;
+    *have_exchange_sig = false;
+  }
+  return qs;
+}