From 2d55647f2aab1feb37d5439049f6824d11cda56c Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Sun, 30 Oct 2022 17:36:57 +0100
Subject: add support for reserve open/close operations to auditor, begin to
 split off purse auditing logic

---
 .../pg_select_reserve_closed_above_serial_id.c     | 180 +++++++++++++++++++++
 1 file changed, 180 insertions(+)
 create mode 100644 src/exchangedb/pg_select_reserve_closed_above_serial_id.c

(limited to 'src/exchangedb/pg_select_reserve_closed_above_serial_id.c')

diff --git a/src/exchangedb/pg_select_reserve_closed_above_serial_id.c b/src/exchangedb/pg_select_reserve_closed_above_serial_id.c
new file mode 100644
index 000000000..985c6792c
--- /dev/null
+++ b/src/exchangedb/pg_select_reserve_closed_above_serial_id.c
@@ -0,0 +1,180 @@
+/*
+   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 pg_select_reserve_closed_above_serial_id.c
+ * @brief Low-level (statement-level) Postgres database access for the exchange
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "taler_error_codes.h"
+#include "taler_dbevents.h"
+#include "taler_pq_lib.h"
+#include "pg_get_reserve_history.h"
+#include "plugin_exchangedb_common.h"
+#include "pg_helper.h"
+
+/**
+ * Closure for #reserve_closed_serial_helper_cb().
+ */
+struct ReserveClosedSerialContext
+{
+
+  /**
+   * Callback to call.
+   */
+  TALER_EXCHANGEDB_ReserveClosedCallback cb;
+
+  /**
+   * Closure for @e cb.
+   */
+  void *cb_cls;
+
+  /**
+   * Plugin's context.
+   */
+  struct PostgresClosure *pg;
+
+  /**
+   * Status code, set to #GNUNET_SYSERR on hard errors.
+   */
+  enum GNUNET_GenericReturnValue status;
+};
+
+
+/**
+ * Helper function to be called with the results of a SELECT statement
+ * that has returned @a num_results results.
+ *
+ * @param cls closure of type `struct ReserveClosedSerialContext`
+ * @param result the postgres result
+ * @param num_results the number of results in @a result
+ */
+static void
+reserve_closed_serial_helper_cb (void *cls,
+                                 PGresult *result,
+                                 unsigned int num_results)
+{
+  struct ReserveClosedSerialContext *rcsc = cls;
+  struct PostgresClosure *pg = rcsc->pg;
+
+  for (unsigned int i = 0; i<num_results; i++)
+  {
+    uint64_t rowid;
+    struct TALER_ReservePublicKeyP reserve_pub;
+    char *receiver_account;
+    struct TALER_WireTransferIdentifierRawP wtid;
+    struct TALER_Amount amount_with_fee;
+    struct TALER_Amount closing_fee;
+    struct GNUNET_TIME_Timestamp execution_date;
+    uint64_t close_request_row;
+    struct GNUNET_PQ_ResultSpec rs[] = {
+      GNUNET_PQ_result_spec_uint64 ("close_uuid",
+                                    &rowid),
+      GNUNET_PQ_result_spec_auto_from_type ("reserve_pub",
+                                            &reserve_pub),
+      GNUNET_PQ_result_spec_timestamp ("execution_date",
+                                       &execution_date),
+      GNUNET_PQ_result_spec_auto_from_type ("wtid",
+                                            &wtid),
+      GNUNET_PQ_result_spec_string ("receiver_account",
+                                    &receiver_account),
+      TALER_PQ_RESULT_SPEC_AMOUNT ("amount",
+                                   &amount_with_fee),
+      TALER_PQ_RESULT_SPEC_AMOUNT ("closing_fee",
+                                   &closing_fee),
+      GNUNET_PQ_result_spec_uint64 ("close_request_row",
+                                    &close_request_row),
+      GNUNET_PQ_result_spec_end
+    };
+    enum GNUNET_GenericReturnValue ret;
+
+    if (GNUNET_OK !=
+        GNUNET_PQ_extract_result (result,
+                                  rs,
+                                  i))
+    {
+      GNUNET_break (0);
+      rcsc->status = GNUNET_SYSERR;
+      return;
+    }
+    ret = rcsc->cb (rcsc->cb_cls,
+                    rowid,
+                    execution_date,
+                    &amount_with_fee,
+                    &closing_fee,
+                    &reserve_pub,
+                    receiver_account,
+                    &wtid,
+                    close_request_row);
+    GNUNET_PQ_cleanup_result (rs);
+    if (GNUNET_OK != ret)
+      break;
+  }
+}
+
+
+enum GNUNET_DB_QueryStatus
+TEH_PG_select_reserve_closed_above_serial_id (
+  void *cls,
+  uint64_t serial_id,
+  TALER_EXCHANGEDB_ReserveClosedCallback cb,
+  void *cb_cls)
+{
+  struct PostgresClosure *pg = cls;
+  struct GNUNET_PQ_QueryParam params[] = {
+    GNUNET_PQ_query_param_uint64 (&serial_id),
+    GNUNET_PQ_query_param_end
+  };
+  struct ReserveClosedSerialContext rcsc = {
+    .cb = cb,
+    .cb_cls = cb_cls,
+    .pg = pg,
+    .status = GNUNET_OK
+  };
+  enum GNUNET_DB_QueryStatus qs;
+
+  /* Used in #postgres_select_reserve_closed_above_serial_id() to
+     obtain information about closed reserves */
+  PREPARE (
+    pg,
+    "reserves_close_get_incr",
+    "SELECT"
+    " close_uuid"
+    ",reserves.reserve_pub"
+    ",execution_date"
+    ",wtid"
+    ",payto_uri AS receiver_account"
+    ",amount_val"
+    ",amount_frac"
+    ",closing_fee_val"
+    ",closing_fee_frac"
+    ",close_request_row"
+    " FROM reserves_close"
+    "   JOIN wire_targets"
+    "     USING (wire_target_h_payto)"
+    "   JOIN reserves"
+    "     USING (reserve_pub)"
+    " WHERE close_uuid>=$1"
+    " ORDER BY close_uuid ASC;");
+  qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
+                                             "reserves_close_get_incr",
+                                             params,
+                                             &reserve_closed_serial_helper_cb,
+                                             &rcsc);
+  if (GNUNET_OK != rcsc.status)
+    return GNUNET_DB_STATUS_HARD_ERROR;
+  return qs;
+}
-- 
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