[taler-merchant] 120/277: implement insert_reserve

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grothoff pushed a commit to branch master
in repository merchant.

commit 211a3cb0db1ac6c97835100b4d128d338b19ba0a
Author: Christian Grothoff <christian@grothoff.org>
AuthorDate: Mon May 18 19:55:34 2020 +0200

    implement insert_reserve
---
 src/backenddb/merchant-0001.sql            |  14 ++--
 src/backenddb/plugin_merchantdb_postgres.c | 129 ++++++++++++++++++++++++++++-
 2 files changed, 135 insertions(+), 8 deletions(-)

diff --git a/src/backenddb/merchant-0001.sql b/src/backenddb/merchant-0001.sql
index 5d50280..cebf63e 100644
--- a/src/backenddb/merchant-0001.sql
+++ b/src/backenddb/merchant-0001.sql
@@ -430,12 +430,12 @@ CREATE TABLE IF NOT EXISTS merchant_tip_reserves
   ,expiration INT8 NOT NULL
   ,merchant_initial_balance_val INT8 NOT NULL
   ,merchant_initial_balance_frac INT4 NOT NULL
-  ,exchange_initial_balance_val INT8 NOT NULL
-  ,exchange_initial_balance_frac INT4 NOT NULL
-  ,tips_committed_val INT8 NOT NULL
-  ,tips_committed_frac INT4 NOT NULL
-  ,tips_picked_up_val INT8 NOT NULL
-  ,tips_picked_up_frac INT4 NOT NULL
+  ,exchange_initial_balance_val INT8 NOT NULL DEFAULT 0
+  ,exchange_initial_balance_frac INT4 NOT NULL DEFAULT 0
+  ,tips_committed_val INT8 NOT NULL DEFAULT 0
+  ,tips_committed_frac INT4 NOT NULL DEFAULT 0
+  ,tips_picked_up_val INT8 NOT NULL DEFAULT 0
+  ,tips_picked_up_frac INT4 NOT NULL DEFAULT 0
   );
 COMMENT ON TABLE merchant_tip_reserves
   IS 'balances of the reserves available for tips';
@@ -450,7 +450,7 @@ COMMENT ON COLUMN merchant_tip_reserves.tips_committed_val
 COMMENT ON COLUMN merchant_tip_reserves.tips_picked_up_val
   IS 'Total amount tips that have been picked up from this reserve';
 
-CREATE TABLE IF NOT EXISTS merchant_tip_reserve_kreys
+CREATE TABLE IF NOT EXISTS merchant_tip_reserve_keys
   (reserve_serial BIGINT NOT NULL UNIQUE
      REFERENCES merchant_tip_reserves (reserve_serial) ON DELETE CASCADE
   ,reserve_priv BYTEA NOT NULL UNIQUE CHECK (LENGTH(reserve_priv)=32)
diff --git a/src/backenddb/plugin_merchantdb_postgres.c 
b/src/backenddb/plugin_merchantdb_postgres.c
index c69507d..5e247d2 100644
--- a/src/backenddb/plugin_merchantdb_postgres.c
+++ b/src/backenddb/plugin_merchantdb_postgres.c
@@ -3719,6 +3719,100 @@ postgres_store_wire_fee_by_exchange (
 }
 
 
+/**
+ * Add @a credit to a reserve to be used for tipping.  Note that
+ * this function does not actually perform any wire transfers to
+ * credit the reserve, it merely tells the merchant backend that
+ * a reserve now exists.  This has to happen before tips can be
+ * authorized.
+ *
+ * @param cls closure, typically a connection to the db
+ * @param instance_id which instance is the reserve tied to
+ * @param reserve_priv which reserve is topped up or created
+ * @param reserve_pub which reserve is topped up or created
+ * @param exchange_url what URL is the exchange reachable at where the reserve 
is located
+ * @param initial_balance how much money will be added to the reserve
+ * @param expiration when does the reserve expire?
+ * @return transaction status, usually
+ *      #GNUNET_DB_STATUS_SUCCESS_ONE_RESULT for success
+ */
+static enum GNUNET_DB_QueryStatus
+postgres_insert_reserve (void *cls,
+                         const char *instance_id,
+                         const struct TALER_ReservePrivateKeyP *reserve_priv,
+                         const struct TALER_ReservePublicKeyP *reserve_pub,
+                         const char *exchange_url,
+                         const struct TALER_Amount *initial_balance,
+                         struct GNUNET_TIME_Absolute expiration)
+{
+  struct PostgresClosure *pg = cls;
+  unsigned int retries;
+  enum GNUNET_DB_QueryStatus qs;
+
+  retries = 0;
+  check_connection (pg);
+RETRY:
+  if (MAX_RETRIES < ++retries)
+    return TALER_EC_TIP_PICKUP_DB_ERROR_SOFT;
+  if (GNUNET_OK !=
+      postgres_start (pg,
+                      "insert reserve"))
+  {
+    GNUNET_break (0);
+    return TALER_EC_TIP_PICKUP_DB_ERROR_HARD;
+  }
+
+  /* Setup reserve */
+  {
+    struct GNUNET_PQ_QueryParam params[] = {
+      GNUNET_PQ_query_param_string (instance_id),
+      GNUNET_PQ_query_param_auto_from_type (reserve_pub),
+      GNUNET_PQ_query_param_absolute_time (&expiration),
+      TALER_PQ_query_param_amount (initial_balance),
+      GNUNET_PQ_query_param_end
+    };
+
+    qs = GNUNET_PQ_eval_prepared_non_select (pg->conn,
+                                             "insert_reserve",
+                                             params);
+    if (0 > qs)
+    {
+      postgres_rollback (pg);
+      if (GNUNET_DB_STATUS_SOFT_ERROR == qs)
+        goto RETRY;
+      return qs;
+    }
+  }
+  /* Store private key */
+  {
+    struct GNUNET_PQ_QueryParam params[] = {
+      GNUNET_PQ_query_param_string (instance_id),
+      GNUNET_PQ_query_param_auto_from_type (reserve_pub),
+      GNUNET_PQ_query_param_auto_from_type (reserve_priv),
+      GNUNET_PQ_query_param_string (exchange_url),
+      GNUNET_PQ_query_param_end
+    };
+
+    qs = GNUNET_PQ_eval_prepared_non_select (pg->conn,
+                                             "insert_reserve_key",
+                                             params);
+    if (0 > qs)
+    {
+      postgres_rollback (pg);
+      if (GNUNET_DB_STATUS_SOFT_ERROR == qs)
+        goto RETRY;
+      return qs;
+    }
+  }
+  qs = postgres_commit (pg);
+  if (0 <= qs)
+    return TALER_EC_NONE; /* success  */
+  if (GNUNET_DB_STATUS_SOFT_ERROR == qs)
+    goto RETRY;
+  return qs;
+}
+
+
 /* ********************* OLD API ************************** */
 
 /**
@@ -4504,7 +4598,11 @@ RETRY:
         postgres_rollback (pg);
         return TALER_EC_TIP_PICKUP_AMOUNT_CHANGED;
       }
-      postgres_commit (pg);
+      qs = postgres_commit (pg);
+      if (qs < 0)
+        return (GNUNET_DB_STATUS_SOFT_ERROR == qs)
+               ? TALER_EC_TIP_PICKUP_DB_ERROR_SOFT
+               : TALER_EC_TIP_PICKUP_DB_ERROR_HARD;
       return TALER_EC_NONE; /* we are done! */
     }
   }
@@ -6315,6 +6413,34 @@ libtaler_plugin_merchantdb_postgres_init (void *cls)
                             " VALUES "
                             "($1, $2, $3, $4, $5, $6, $7, $8, $9)",
                             9),
+    /* For postgres_insert_reserve() */
+    GNUNET_PQ_make_prepare ("insert_reserve",
+                            "INSERT INTO merchant_tip_reserves"
+                            "(reserve_pub"
+                            ",merchant_serial"
+                            ",expiration"
+                            ",merchant_initial_balance_val"
+                            ",merchant_initial_balance_frac"
+                            ")"
+                            "SELECT $2, merchant_serial, $3, $4, $5"
+                            " FROM merchant_instances"
+                            " WHERE merchant_id=$1",
+                            5),
+    /* For postgres_insert_reserve() */
+    GNUNET_PQ_make_prepare ("insert_reserve_key",
+                            "INSERT INTO merchant_tip_reserve_keys"
+                            "(reserve_serial"
+                            ",reserve_priv"
+                            ",exchange_url"
+                            ")"
+                            "SELECT reserve_serial, $3, $4"
+                            " FROM merchant_tip_reserves"
+                            " WHERE reserve_pub=$2"
+                            "   AND merchant_serial="
+                            "     (SELECT merchant_serial"
+                            "        FROM merchant_instances"
+                            "       WHERE merchant_id=$1)",
+                            4),
     /* OLD API: */
 
 #if 0
@@ -6628,6 +6754,7 @@ libtaler_plugin_merchantdb_postgres_init (void *cls)
   plugin->lookup_transfer_summary = &postgres_lookup_transfer_summary;
   plugin->lookup_transfer_details = &postgres_lookup_transfer_details;
   plugin->lookup_transfers = &postgres_lookup_transfers;
+  plugin->insert_reserve = &postgres_insert_reserve;
 
 /* OLD API: */
   plugin->store_coin_to_transfer = &postgres_store_coin_to_transfer;

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