factor out lookup_reserves shit job

1 files changed, 221 insertions, 0 deletions

diff --git a/src/backenddb/pg_lookup_reserves.c b/src/backenddb/pg_lookup_reserves.c
new file mode 100644
index 00000000..90b81f30
--- /dev/null
+++ b/src/backenddb/pg_lookup_reserves.c
@@ -0,0 +1,221 @@
+/*
+   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 backenddb/pg_lookup_reserves.c
+ * @brief Implementation of the lookup_reserves function for Postgres
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include <taler/taler_error_codes.h>
+#include <taler/taler_dbevents.h>
+#include <taler/taler_pq_lib.h>
+#include "pg_lookup_reserves.h"
+#include "pg_helper.h"
+
+
+/**
+ * Closure for #lookup_reserves_cb.
+ */
+struct LookupReservesContext
+{
+  /**
+   * Postgres context.
+   */
+  struct PostgresClosure *pg;
+
+  /**
+   * Function to call with the results
+   */
+  TALER_MERCHANTDB_ReservesCallback cb;
+
+  /**
+   * Closure for @e cb
+   */
+  void *cb_cls;
+
+  /**
+   * Filter by active reserves.
+   */
+  enum TALER_EXCHANGE_YesNoAll active;
+
+  /**
+   * Filter by failures (mismatch in exchange claimed and
+   * merchant claimed initial amounts).
+   */
+  enum TALER_EXCHANGE_YesNoAll failures;
+
+  /**
+   * 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_reserves_cb (void *cls,
+                    PGresult *result,
+                    unsigned int num_results)
+{
+  struct LookupReservesContext *lrc = cls;
+  struct PostgresClosure *pg = lrc->pg;
+
+  for (unsigned int i = 0; i < num_results; i++)
+  {
+    struct TALER_ReservePublicKeyP reserve_pub;
+    struct GNUNET_TIME_Timestamp creation_time;
+    struct GNUNET_TIME_Timestamp expiration_time;
+    struct TALER_Amount merchant_initial_balance;
+    struct TALER_Amount exchange_initial_balance;
+    struct TALER_Amount pickup_amount;
+    struct TALER_Amount committed_amount;
+    uint8_t active;
+    struct GNUNET_PQ_ResultSpec rs[] = {
+      GNUNET_PQ_result_spec_auto_from_type ("reserve_pub",
+                                            &reserve_pub),
+      GNUNET_PQ_result_spec_timestamp ("creation_time",
+                                       &creation_time),
+      GNUNET_PQ_result_spec_timestamp ("expiration",
+                                       &expiration_time),
+      TALER_PQ_RESULT_SPEC_AMOUNT ("merchant_initial_balance",
+                                   &merchant_initial_balance),
+      TALER_PQ_RESULT_SPEC_AMOUNT ("exchange_initial_balance",
+                                   &exchange_initial_balance),
+      TALER_PQ_RESULT_SPEC_AMOUNT ("tips_committed",
+                                   &committed_amount),
+      TALER_PQ_RESULT_SPEC_AMOUNT ("tips_picked_up",
+                                   &pickup_amount),
+      GNUNET_PQ_result_spec_auto_from_type ("active",
+                                            &active),
+      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;
+    }
+    switch (lrc->active)
+    {
+    case TALER_EXCHANGE_YNA_YES:
+      if (0 == active)
+        continue;
+      break;
+    case TALER_EXCHANGE_YNA_NO:
+      if (0 != active)
+        continue;
+      break;
+    case TALER_EXCHANGE_YNA_ALL:
+      break;
+    }
+    switch (lrc->failures)
+    {
+    case TALER_EXCHANGE_YNA_YES:
+      if (0 ==
+          TALER_amount_cmp (&merchant_initial_balance,
+                            &exchange_initial_balance))
+        continue;
+      break;
+    case TALER_EXCHANGE_YNA_NO:
+      if (0 !=
+          TALER_amount_cmp (&merchant_initial_balance,
+                            &exchange_initial_balance))
+        continue;
+      break;
+    case TALER_EXCHANGE_YNA_ALL:
+      break;
+    }
+    lrc->cb (lrc->cb_cls,
+             &reserve_pub,
+             creation_time,
+             expiration_time,
+             &merchant_initial_balance,
+             &exchange_initial_balance,
+             &pickup_amount,
+             &committed_amount,
+             (0 != active));
+  }
+}
+
+
+enum GNUNET_DB_QueryStatus
+TMH_PG_lookup_reserves (void *cls,
+                        const char *instance_id,
+                        struct GNUNET_TIME_Timestamp created_after,
+                        enum TALER_EXCHANGE_YesNoAll active,
+                        enum TALER_EXCHANGE_YesNoAll failures,
+                        TALER_MERCHANTDB_ReservesCallback cb,
+                        void *cb_cls)
+{
+  struct PostgresClosure *pg = cls;
+  struct LookupReservesContext lrc = {
+    .pg = pg,
+    .active = active,
+    .failures = failures,
+    .cb = cb,
+    .cb_cls = cb_cls
+  };
+  struct GNUNET_PQ_QueryParam params[] = {
+    GNUNET_PQ_query_param_string (instance_id),
+    GNUNET_PQ_query_param_timestamp (&created_after),
+    GNUNET_PQ_query_param_end
+  };
+  enum GNUNET_DB_QueryStatus qs;
+
+  check_connection (pg);
+  PREPARE (pg,
+           "lookup_reserves",
+           "SELECT"
+           " reserve_pub"
+           ",creation_time"
+           ",expiration"
+           ",merchant_initial_balance_val"
+           ",merchant_initial_balance_frac"
+           ",exchange_initial_balance_val"
+           ",exchange_initial_balance_frac"
+           ",tips_committed_val"
+           ",tips_committed_frac"
+           ",tips_picked_up_val"
+           ",tips_picked_up_frac"
+           ",reserve_priv IS NOT NULL AS active"
+           " FROM merchant_tip_reserves"
+           " FULL OUTER JOIN merchant_tip_reserve_keys USING (reserve_serial)"
+           " WHERE creation_time > $2"
+           "   AND merchant_serial ="
+           "     (SELECT merchant_serial"
+           "        FROM merchant_instances"
+           "       WHERE merchant_id=$1)");
+  qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
+                                             "lookup_reserves",
+                                             params,
+                                             &lookup_reserves_cb,
+                                             &lrc);
+  if (lrc.qs < 0)
+    return lrc.qs;
+  return qs;
+}