1 files changed, 142 insertions, 0 deletions
diff --git a/src/backend/taler-merchant-httpd_reserves.c b/src/backend/taler-merchant-httpd_reserves.c
new file mode 100644
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--- /dev/null
+++ b/src/backend/taler-merchant-httpd_reserves.c
@@ -0,0 +1,142 @@
+/*
+  This file is part of TALER
+  (C) 2020 Taler Systems SA
+
+  TALER is free software; you can redistribute it and/or modify it under the
+  terms of the GNU Affero 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 backend/taler-merchant-httpd_reserves.c
+ * @brief logic for initially tracking a reserve's status
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include <taler/taler_json_lib.h>
+#include "taler-merchant-httpd.h"
+#include "taler-merchant-httpd_reserves.h"
+
+
+/**
+ * Our representation of a reserve that we are (still) checking the status of.
+ */
+struct Reserve
+{
+  /**
+   * Reserve's public key.
+   */
+  struct TALER_ReservePublicKeyP reserve_pub;
+
+  /**
+   * Amount the merchant expects to see in the reserve initially.
+   * We log a warning if there is a missmatch.
+   */
+  struct TALER_Amount expected_amount;
+
+  /**
+   * URL of the exchange hosting this reserve.
+   */
+  char *exchange_url;
+
+  /**
+   * Instance this reserve belongs with.
+   */
+  char *instance_id;
+};
+
+
+/**
+ * Function called with information about a reserve that we need
+ * to check the status from at the exchange to see if/when it has
+ * been filled (and with what amount).
+ *
+ * @param cls closure
+ * @param instance_id for which instance is this reserve
+ * @param exchange_url base URL of the exchange at which the reserve lives
+ * @param reserve_pub public key of the reserve
+ * @param expected_amount how much do we expect to see in the reserve
+ */
+static void
+add_reserve (void *cls,
+             const char *instance_id,
+             const char *exchange_url,
+             const struct TALER_ReservePublicKeyP *reserve_pub,
+             const struct TALER_Amount *expected_amount)
+{
+  struct Reserve *r;
+
+  r = GNUNET_new (struct Reserve);
+  r->exchange_url = GNUNET_strdup (exchange_url);
+  r->instance_id = GNUNET_strdup (instance_id);
+  r->reserve_pub = *reserve_pub;
+  r->expected_amount = *expected_amount;
+  // ....
+}
+
+
+/**
+ * Load information about reserves and start querying reserve status.
+ * Must be called after the database is available.
+ */
+void
+TMH_RESERVES_init (void)
+{
+  TMH_db->lookup_pending_reserves (TMH_db->cls,
+                                   &add_reserve,
+                                   NULL);
+}
+
+
+/**
+ * Add a reserve to the list of reserves to check.
+ *
+ * @param instance_id which instance is the reserve for
+ * @param exchange_url URL of the exchange with the reserve
+ * @param reserve_pub public key of the reserve to check
+ * @param expected_amount amount the merchant expects to see initially in the reserve
+ */
+void
+TMH_RESERVES_check (const char *instance_id,
+                    const char *exchange_url,
+                    const struct TALER_ReservePublicKeyP *reserve_pub,
+                    const struct TALER_Amount *expected_amount)
+{
+  enum GNUNET_DB_QueryStatus qs;
+
+  add_reserve (NULL,
+               instance_id,
+               exchange_url,
+               reserve_pub,
+               expected_amount);
+
+  // Do this temporarily for testing
+  qs = TMH_db->activate_reserve (TMH_db->cls,
+                                 instance_id,
+                                 reserve_pub,
+                                 expected_amount); // FIXME: change to REAL amount later!
+  if (qs <= 0)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Failed to commit reserve activation to database (%d)\n",
+                (int) qs);
+  }
+}
+
+
+/**
+ * Stop checking reserve status.
+ */
+void
+TMH_RESERVES_done (void)
+{
+}
+
+
+/* end of taler-merchant-httpd_reserves.c */