1 files changed, 140 insertions, 0 deletions
diff --git a/src/exchangedb/pg_wire_prepare_data_get.c b/src/exchangedb/pg_wire_prepare_data_get.c
new file mode 100644
index 000000000..0cc57e41f
--- /dev/null
+++ b/src/exchangedb/pg_wire_prepare_data_get.c
@@ -0,0 +1,140 @@
+/*
+   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 exchangedb/pg_wire_prepare_data_get.c
+ * @brief Implementation of the wire_prepare_data_get function for Postgres
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "taler_error_codes.h"
+#include "taler_dbevents.h"
+#include "taler_pq_lib.h"
+#include "pg_wire_prepare_data_get.h"
+#include "pg_helper.h"
+
+/**
+ * Closure for #prewire_cb().
+ */
+struct PrewireContext
+{
+  /**
+   * Function to call on each result.
+   */
+  TALER_EXCHANGEDB_WirePreparationIterator cb;
+
+  /**
+   * Closure for @a cb.
+   */
+  void *cb_cls;
+
+  /**
+   * #GNUNET_OK if everything went fine.
+   */
+  enum GNUNET_GenericReturnValue status;
+};
+
+
+/**
+ * Invoke the callback for each result.
+ *
+ * @param cls a `struct MissingWireContext *`
+ * @param result SQL result
+ * @param num_results number of rows in @a result
+ */
+static void
+prewire_cb (void *cls,
+            PGresult *result,
+            unsigned int num_results)
+{
+  struct PrewireContext *pc = cls;
+
+  for (unsigned int i = 0; i < num_results; i++)
+  {
+    uint64_t prewire_uuid;
+    char *wire_method;
+    void *buf = NULL;
+    size_t buf_size;
+    struct GNUNET_PQ_ResultSpec rs[] = {
+      GNUNET_PQ_result_spec_uint64 ("prewire_uuid",
+                                    &prewire_uuid),
+      GNUNET_PQ_result_spec_string ("wire_method",
+                                    &wire_method),
+      GNUNET_PQ_result_spec_variable_size ("buf",
+                                           &buf,
+                                           &buf_size),
+      GNUNET_PQ_result_spec_end
+    };
+
+    if (GNUNET_OK !=
+        GNUNET_PQ_extract_result (result,
+                                  rs,
+                                  i))
+    {
+      GNUNET_break (0);
+      pc->status = GNUNET_SYSERR;
+      return;
+    }
+    pc->cb (pc->cb_cls,
+            prewire_uuid,
+            wire_method,
+            buf,
+            buf_size);
+    GNUNET_PQ_cleanup_result (rs);
+  }
+}
+
+
+enum GNUNET_DB_QueryStatus
+TEH_PG_wire_prepare_data_get (void *cls,
+                              uint64_t start_row,
+                              uint64_t limit,
+                              TALER_EXCHANGEDB_WirePreparationIterator cb,
+                              void *cb_cls)
+{
+  struct PostgresClosure *pg = cls;
+  struct GNUNET_PQ_QueryParam params[] = {
+    GNUNET_PQ_query_param_uint64 (&start_row),
+    GNUNET_PQ_query_param_uint64 (&limit),
+    GNUNET_PQ_query_param_end
+  };
+  struct PrewireContext pc = {
+    .cb = cb,
+    .cb_cls = cb_cls,
+    .status = GNUNET_OK
+  };
+  enum GNUNET_DB_QueryStatus qs;
+
+  PREPARE (pg,
+           "wire_prepare_data_get",
+           "SELECT"
+           " prewire_uuid"
+           ",wire_method"
+           ",buf"
+           " FROM prewire"
+           " WHERE prewire_uuid >= $1"
+           "   AND finished=FALSE"
+           "   AND failed=FALSE"
+           " ORDER BY prewire_uuid ASC"
+           " LIMIT $2;");
+  qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
+                                             "wire_prepare_data_get",
+                                             params,
+                                             &prewire_cb,
+                                             &pc);
+  if (GNUNET_OK != pc.status)
+    return GNUNET_DB_STATUS_HARD_ERROR;
+  return qs;
+}