add post HTTP request check for hanging transactions

src/exchange/taler-exchange-httpd.c

@@ -146,6 +146,12 @@ handle_mhd_completion_callback (void *cls,
     return;
   TEH_PARSE_post_cleanup_callback (*con_cls);
   *con_cls = NULL;
+  /* check that we didn't leave any transactions hanging */
+  /* NOTE: In high-performance production, we might want to
+     remove this. */
+  TEH_plugin->preflight (TEH_plugin->cls,
+                         TEH_plugin->get_session (TEH_plugin->cls));
+
 }
 
 

src/exchangedb/plugin_exchangedb_postgres.c

@@ -1075,11 +1075,9 @@ postgres_prepare (PGconn *db_conn)
                             ",h_contract_terms"
                             ",h_wire"
                             " FROM deposits"
-                            " WHERE ("
-                            "        (coin_pub=$1)"
+                            " WHERE ((coin_pub=$1)"
                             "    AND (merchant_pub=$3)"
-                            "    AND (h_contract_terms=$2)"
-                            " )"
+                            "    AND (h_contract_terms=$2))"
                             " FOR UPDATE;",
                             3),
     /* Fetch deposits with rowid '\geq' the given parameter */