1 files changed, 146 insertions, 0 deletions
diff --git a/src/backenddb/pg_select_accounts_by_exchange.c b/src/backenddb/pg_select_accounts_by_exchange.c
new file mode 100644
index 00000000..c7637031
--- /dev/null
+++ b/src/backenddb/pg_select_accounts_by_exchange.c
@@ -0,0 +1,146 @@
+/*
+   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_select_accounts_by_exchange.c
+ * @brief Implementation of the select_accounts_by_exchange 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_select_accounts_by_exchange.h"
+#include "pg_helper.h"
+
+
+/**
+ * Closure for #parse_accounts.
+ */
+struct SelectAccountContext
+{
+  /**
+   * Function to call on each result.
+   */
+  TALER_MERCHANTDB_ExchangeAccountCallback cb;
+
+  /**
+   * Closure for @e cb.
+   */
+  void *cb_cls;
+
+  /**
+   * Set to true on failure.
+   */
+  bool failed;
+};
+
+/**
+ * Function to be called with the results of a SELECT statement
+ * that has returned @a num_results results about accounts.
+ *
+ * @param cls of type `struct SelectAccountContext *`
+ * @param result the postgres result
+ * @param num_results the number of results in @a result
+ */
+static void
+parse_accounts (void *cls,
+                PGresult *result,
+                unsigned int num_results)
+{
+  struct SelectAccountContext *ctx = cls;
+
+  for (unsigned int i = 0; i < num_results; i++)
+  {
+    char *payto_uri;
+    char *conversion_url = NULL;
+    json_t *debit_restrictions;
+    json_t *credit_restrictions;
+    struct TALER_MasterSignatureP master_sig;
+    struct GNUNET_PQ_ResultSpec rs[] = {
+      GNUNET_PQ_result_spec_auto_from_type ("master_sig",
+                                            &master_sig),
+      GNUNET_PQ_result_spec_string ("payto_uri",
+                                    &payto_uri),
+      GNUNET_PQ_result_spec_allow_null (
+        GNUNET_PQ_result_spec_string ("conversion_url",
+                                      &conversion_url),
+        NULL),
+      TALER_PQ_result_spec_json ("debit_restrictions",
+                                 &debit_restrictions),
+      TALER_PQ_result_spec_json ("credit_restrictions",
+                                 &credit_restrictions),
+      GNUNET_PQ_result_spec_end
+    };
+
+    if (GNUNET_OK !=
+        GNUNET_PQ_extract_result (result,
+                                  rs,
+                                  i))
+    {
+      GNUNET_break (0);
+      ctx->failed = true;
+      return;
+    }
+    ctx->cb (ctx->cb_cls,
+             payto_uri,
+             conversion_url,
+             debit_restrictions,
+             credit_restrictions,
+             &master_sig);
+    GNUNET_PQ_cleanup_result (rs);
+  }
+}
+
+
+enum GNUNET_DB_QueryStatus
+TMH_PG_select_accounts_by_exchange (
+  void *cls,
+  const struct TALER_MasterPublicKeyP *master_pub,
+  TALER_MERCHANTDB_ExchangeAccountCallback cb,
+  void *cb_cls)
+{
+  struct PostgresClosure *pg = cls;
+  struct SelectAccountContext ctx = {
+    .cb = cb,
+    .cb_cls = cb_cls
+  };
+  struct GNUNET_PQ_QueryParam params[] = {
+    GNUNET_PQ_query_param_auto_from_type (master_pub),
+    GNUNET_PQ_query_param_end
+  };
+  enum GNUNET_DB_QueryStatus qs;
+
+  check_connection (pg);
+  PREPARE (pg,
+           "select_exchange_accounts",
+           "SELECT"
+           " payto_uri"
+           ",conversion_url"
+           ",debit_restrictions"
+           ",credit_restrictions"
+           ",master_sig"
+           " FROM merchant_exchange_accounts"
+           " WHERE master_pub=$1;");
+  qs = GNUNET_PQ_eval_prepared_multi_select (
+    pg->conn,
+    "select_exchange_accounts",
+    params,
+    &parse_accounts,
+    &ctx);
+  if (ctx.failed)
+    return GNUNET_DB_STATUS_HARD_ERROR;
+  return qs;
+}