1 files changed, 126 insertions, 0 deletions
diff --git a/src/auditordb/pg_list_exchanges.c b/src/auditordb/pg_list_exchanges.c
new file mode 100644
index 000000000..964c01925
--- /dev/null
+++ b/src/auditordb/pg_list_exchanges.c
@@ -0,0 +1,126 @@
+/*
+   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_list_exchanges.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_list_exchanges.h"
+#include "pg_helper.h"
+
+
+/**
+ * Closure for #exchange_info_cb().
+ */
+struct ExchangeInfoContext
+{
+
+  /**
+   * Function to call for each exchange.
+   */
+  TALER_AUDITORDB_ExchangeCallback cb;
+
+  /**
+   * Closure for @e cb
+   */
+  void *cb_cls;
+
+  /**
+   * Query status to return.
+   */
+  enum GNUNET_DB_QueryStatus qs;
+};
+
+
+/**
+ * Helper function for #postgres_list_exchanges().
+ * To be called with the results of a SELECT statement
+ * that has returned @a num_results results.
+ *
+ * @param cls closure of type `struct ExchangeInfoContext *`
+ * @param result the postgres result
+ * @param num_results the number of results in @a result
+ */
+static void
+exchange_info_cb (void *cls,
+                  PGresult *result,
+                  unsigned int num_results)
+{
+  struct ExchangeInfoContext *eic = cls;
+
+  for (unsigned int i = 0; i < num_results; i++)
+  {
+    struct TALER_MasterPublicKeyP master_pub;
+    char *exchange_url;
+    struct GNUNET_PQ_ResultSpec rs[] = {
+      GNUNET_PQ_result_spec_auto_from_type ("master_pub", &master_pub),
+      GNUNET_PQ_result_spec_string ("exchange_url", &exchange_url),
+      GNUNET_PQ_result_spec_end
+    };
+
+    if (GNUNET_OK !=
+        GNUNET_PQ_extract_result (result,
+                                  rs,
+                                  i))
+    {
+      GNUNET_break (0);
+      eic->qs = GNUNET_DB_STATUS_HARD_ERROR;
+      return;
+    }
+    eic->qs = i + 1;
+    eic->cb (eic->cb_cls,
+             &master_pub,
+             exchange_url);
+    GNUNET_free (exchange_url);
+  }
+}
+
+
+enum GNUNET_DB_QueryStatus
+TAH_PG_list_exchanges (void *cls,
+                       TALER_AUDITORDB_ExchangeCallback cb,
+                       void *cb_cls)
+{
+  struct PostgresClosure *pg = cls;
+  struct GNUNET_PQ_QueryParam params[] = {
+    GNUNET_PQ_query_param_end
+  };
+  struct ExchangeInfoContext eic = {
+    .cb = cb,
+    .cb_cls = cb_cls
+  };
+  enum GNUNET_DB_QueryStatus qs;
+
+  PREPARE (pg,
+           "auditor_list_exchanges",
+           "SELECT"
+           " master_pub"
+           ",exchange_url"
+           " FROM auditor_exchanges");
+  qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
+                                             "auditor_list_exchanges",
+                                             params,
+                                             &exchange_info_cb,
+                                             &eic);
+  if (qs > 0)
+    return eic.qs;
+  GNUNET_break (GNUNET_DB_STATUS_HARD_ERROR != qs);
+  return qs;
+}