diff options
Diffstat (limited to 'src/backenddb/pg_lookup_deposits_by_contract_and_coin.c')
-rw-r--r-- | src/backenddb/pg_lookup_deposits_by_contract_and_coin.c | 135 |
1 files changed, 129 insertions, 6 deletions
diff --git a/src/backenddb/pg_lookup_deposits_by_contract_and_coin.c b/src/backenddb/pg_lookup_deposits_by_contract_and_coin.c index 9bf46d0c..29ff3926 100644 --- a/src/backenddb/pg_lookup_deposits_by_contract_and_coin.c +++ b/src/backenddb/pg_lookup_deposits_by_contract_and_coin.c @@ -46,6 +46,11 @@ struct LookupDepositsByCnCContext struct PostgresClosure *pg; /** + * Total amount refunded on this coin and contract. + */ + struct TALER_Amount refund_total; + + /** * Transaction result. */ enum GNUNET_DB_QueryStatus qs; @@ -61,6 +66,51 @@ struct LookupDepositsByCnCContext * @param num_results the number of results in @a result */ static void +lookup_refunds_cb (void *cls, + PGresult *result, + unsigned int num_results) +{ + struct LookupDepositsByCnCContext *ldcc = cls; + + for (unsigned int i = 0; i<num_results; i++) + { + struct TALER_Amount refund_amount; + struct GNUNET_PQ_ResultSpec rs[] = { + TALER_PQ_result_spec_amount_with_currency ("refund_amount", + &refund_amount), + GNUNET_PQ_result_spec_end + }; + + if (GNUNET_OK != + GNUNET_PQ_extract_result (result, + rs, + i)) + { + GNUNET_break (0); + ldcc->qs = GNUNET_DB_STATUS_HARD_ERROR; + return; + } + if (0 == i) + ldcc->refund_total = refund_amount; + else + GNUNET_assert (0 <= + TALER_amount_add (&ldcc->refund_total, + &ldcc->refund_total, + &refund_amount)); + GNUNET_PQ_cleanup_result (rs); /* technically useless here */ + } +} + + +/** + * Function to be called with the results of a SELECT statement + * that has returned @a num_results results. + * + * @param cls of type `struct LookupDepositsByCnCContext *` + * @param result the postgres result + * @param num_results the number of results in @a result + */ +static void lookup_deposits_by_contract_and_coin_cb (void *cls, PGresult *result, unsigned int num_results) @@ -112,6 +162,50 @@ lookup_deposits_by_contract_and_coin_cb (void *cls, ldcc->qs = GNUNET_DB_STATUS_HARD_ERROR; return; } + if (TALER_amount_is_valid (&ldcc->refund_total)) + { + if (1 == + TALER_amount_cmp (&ldcc->refund_total, + &amount_with_fee)) + { + /* Refunds exceeded total deposit? not OK! */ + GNUNET_break (0); + ldcc->qs = GNUNET_DB_STATUS_HARD_ERROR; + return; + } + if (0 == + TALER_amount_cmp (&ldcc->refund_total, + &amount_with_fee)) + { + /* refund_total == amount_with_fee; + in this case, the total contributed to the + wire transfer is zero (as are fees) */ + GNUNET_assert (GNUNET_OK == + TALER_amount_set_zero (ldcc->refund_total.currency, + &amount_with_fee)); + GNUNET_assert (GNUNET_OK == + TALER_amount_set_zero (ldcc->refund_total.currency, + &deposit_fee)); + + } + else + { + /* Compute deposit value by subtracting refunds */ + GNUNET_assert (0 < + TALER_amount_subtract (&amount_with_fee, + &amount_with_fee, + &ldcc->refund_total)); + if (-1 == + TALER_amount_cmp (&amount_with_fee, + &deposit_fee)) + { + /* amount_with_fee < deposit_fee, so after refunds less than + the deposit fee remains; reduce deposit fee to + the remaining value of the coin */ + deposit_fee = amount_with_fee; + } + } + } ldcc->cb (ldcc->cb_cls, exchange_url, &amount_with_fee, @@ -128,13 +222,15 @@ lookup_deposits_by_contract_and_coin_cb (void *cls, ldcc->qs = num_results; } + enum GNUNET_DB_QueryStatus -TMH_PG_lookup_deposits_by_contract_and_coin (void *cls, - const char *instance_id, - const struct TALER_PrivateContractHashP *h_contract_terms, - const struct TALER_CoinSpendPublicKeyP *coin_pub, - TALER_MERCHANTDB_CoinDepositCallback cb, - void *cb_cls) +TMH_PG_lookup_deposits_by_contract_and_coin ( + void *cls, + const char *instance_id, + const struct TALER_PrivateContractHashP *h_contract_terms, + const struct TALER_CoinSpendPublicKeyP *coin_pub, + TALER_MERCHANTDB_CoinDepositCallback cb, + void *cb_cls) { struct PostgresClosure *pg = cls; struct GNUNET_PQ_QueryParam params[] = { @@ -151,6 +247,33 @@ TMH_PG_lookup_deposits_by_contract_and_coin (void *cls, enum GNUNET_DB_QueryStatus qs; check_connection (pg); + /* no preflight check here, run in transaction by caller! */ + TALER_LOG_DEBUG ("Looking for refund of h_contract_terms %s at `%s'\n", + GNUNET_h2s (&h_contract_terms->hash), + instance_id); + check_connection (pg); + PREPARE (pg, + "lookup_refunds_by_coin_and_contract", + "SELECT" + " refund_amount" + " FROM merchant_refunds" + " WHERE coin_pub=$3" + " AND order_serial=" + " (SELECT order_serial" + " FROM merchant_contract_terms" + " WHERE h_contract_terms=$2" + " AND merchant_serial=" + " (SELECT merchant_serial" + " FROM merchant_instances" + " WHERE merchant_id=$1))"); + qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn, + "lookup_refunds_by_coin_and_contract", + params, + &lookup_refunds_cb, + &ldcc); + if (0 > qs) + return qs; + PREPARE (pg, "lookup_deposits_by_contract_and_coin", "SELECT" |