From 696278ce80c7613e39c24e138dd6c99116080adb Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Wed, 25 Aug 2021 17:23:35 +0200
Subject: complete implementation of #6956: long polling triggers via database
 backend

---
 src/backenddb/plugin_merchantdb_postgres.c | 69 +++++++++++++++++++++++++++++-
 1 file changed, 68 insertions(+), 1 deletion(-)

(limited to 'src/backenddb')

diff --git a/src/backenddb/plugin_merchantdb_postgres.c b/src/backenddb/plugin_merchantdb_postgres.c
index 3036a439..d56c4b8b 100644
--- a/src/backenddb/plugin_merchantdb_postgres.c
+++ b/src/backenddb/plugin_merchantdb_postgres.c
@@ -2500,6 +2500,56 @@ postgres_lookup_order_status (void *cls,
 }
 
 
+/**
+ * Retrieve contract terms given its @a order_serial
+ *
+ * @param cls closure
+ * @param instance_id instance's identifier
+ * @param order_serial serial ID of the order to look up
+ * @param[out] order_id set to ID of the order
+ * @param[out] h_contract_terms set to the hash of the contract.
+ * @param[out] paid set to the payment status of the contract
+ * @return transaction status
+ */
+static enum GNUNET_DB_QueryStatus
+postgres_lookup_order_status_by_serial (void *cls,
+                                        const char *instance_id,
+                                        uint64_t order_serial,
+                                        char **order_id,
+                                        struct GNUNET_HashCode *h_contract_terms,
+                                        bool *paid)
+{
+  struct PostgresClosure *pg = cls;
+  uint8_t paid8;
+  enum GNUNET_DB_QueryStatus qs;
+  struct GNUNET_PQ_QueryParam params[] = {
+    GNUNET_PQ_query_param_string (instance_id),
+    GNUNET_PQ_query_param_uint64 (&order_serial),
+    GNUNET_PQ_query_param_end
+  };
+  struct GNUNET_PQ_ResultSpec rs[] = {
+    GNUNET_PQ_result_spec_auto_from_type ("h_contract_terms",
+                                          h_contract_terms),
+    GNUNET_PQ_result_spec_auto_from_type ("paid",
+                                          &paid8),
+    GNUNET_PQ_result_spec_string ("order_id",
+                                  order_id),
+    GNUNET_PQ_result_spec_end
+  };
+
+  check_connection (pg);
+  qs = GNUNET_PQ_eval_prepared_singleton_select (pg->conn,
+                                                 "lookup_order_status_by_serial",
+                                                 params,
+                                                 rs);
+  if (GNUNET_DB_STATUS_SUCCESS_ONE_RESULT == qs)
+    *paid = (0 != paid8);
+  else
+    *paid = false; /* just to be safe(r) */
+  return qs;
+}
+
+
 /**
  * Retrieve payment and wire status for a given @a order_serial and session ID.
  *
@@ -7898,12 +7948,27 @@ postgres_connect (void *cls)
                             " h_contract_terms"
                             ",paid"
                             " FROM merchant_contract_terms"
-                            " WHERE merchant_contract_terms.merchant_serial="
+                            " WHERE merchant_serial="
                             "     (SELECT merchant_serial "
                             "        FROM merchant_instances"
                             "        WHERE merchant_id=$1)"
                             "   AND order_id=$2",
                             2),
+
+    /* for postgres_lookup_order_status_by_serial() */
+    GNUNET_PQ_make_prepare ("lookup_order_status_by_serial",
+                            "SELECT"
+                            " h_contract_terms"
+                            ",order_id"
+                            ",paid"
+                            " FROM merchant_contract_terms"
+                            " WHERE merchant_serial="
+                            "     (SELECT merchant_serial "
+                            "        FROM merchant_instances"
+                            "        WHERE merchant_id=$1)"
+                            "   AND order_serial=$2",
+                            2),
+
     /* for postgres_lookup_payment_status() */
     GNUNET_PQ_make_prepare ("lookup_payment_status",
                             "SELECT"
@@ -9046,6 +9111,8 @@ libtaler_plugin_merchantdb_postgres_init (void *cls)
   plugin->mark_contract_paid = &postgres_mark_contract_paid;
   plugin->refund_coin = &postgres_refund_coin;
   plugin->lookup_order_status = &postgres_lookup_order_status;
+  plugin->lookup_order_status_by_serial =
+    &postgres_lookup_order_status_by_serial;
   plugin->lookup_payment_status = &postgres_lookup_payment_status;
   plugin->lookup_deposits_by_order = &postgres_lookup_deposits_by_order;
   plugin->lookup_transfer_details_by_order =
-- 
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