Function handle_failure

plugins/renepay/routefail.c:201–557

FIXME: do proper error handling for BOLT12 */

/* FIXME: do proper error handling for BOLT12 */
static struct command_result *handle_failure(struct routefail *r)
{
	/* BOLT #4:
	 *
	 * A _forwarding node_ MAY, but a _final node_ MUST NOT:
	 *...
	 *     - return an `invalid_onion_version` error.
	 *...
	 *     - return an `invalid_onion_hmac` error.
	 *...
	 *     - return an `invalid_onion_key` error.
	 *...
	 *     - return a `temporary_channel_failure` error.
	 *...
	 *     - return a `permanent_channel_failure` error.
	 *...
	 *     - return a `required_channel_feature_missing` error.
	 *...
	 *     - return an `unknown_next_peer` error.
	 *...
	 *     - return an `amount_below_minimum` error.
	 *...
	 *     - return a `fee_insufficient` error.
	 *...
	 *     - return an `incorrect_cltv_expiry` error.
	 *...
	 *     - return an `expiry_too_soon` error.
	 *...
	 *     - return an `expiry_too_far` error.
	 *...
	 *     - return a `channel_disabled` error.
	 */
	/* BOLT #4:
	 *
	 * An _intermediate hop_ MUST NOT, but the _final node_:
	 *...
	 *     - MUST return an `incorrect_or_unknown_payment_details` error.
	 *...
	 *     - MUST return `final_incorrect_cltv_expiry` error.
	 *...
	 *     - MUST return a `final_incorrect_htlc_amount` error.
	 */
	assert(r);
	struct route *route = r->route;
	assert(route);
	struct payment_result *result = route->result;
	assert(result);
	struct payment *payment = r->payment;
	assert(payment);

	int path_len = 0;
	if (route->hops)
		path_len = tal_count(route->hops);

	enum onion_wire failcode;
	if(result->failcode)
		failcode = *result->failcode;
	else{