Function fail_out_htlc

lightningd/peer_htlcs.c:217–239

localfail are for handing to the local payer if it's local. */

/* localfail are for handing to the local payer if it's local. */
static void fail_out_htlc(struct htlc_out *hout, const char *localfail)
{
	htlc_out_check(hout, __func__);
	assert(hout->failmsg || hout->failonion);

	if (hout->am_origin) {
		payment_failed(hout->key.channel->peer->ld, hout, localfail);
	} else if (hout->in) {
		const struct onionreply *failonion;

		/* If we have an onion, simply copy it. */
		if (hout->failonion)
			failonion = hout->failonion;
		/* Otherwise, we need to onionize this local error. */
		else
			failonion = create_onionreply(hout,
						      hout->in->shared_secret,
						      hout->failmsg);
		fail_in_htlc(hout->in, failonion);
	} else {
		log_broken(hout->key.channel->log, "Neither origin nor in?");
	}
}

/* BOLT #4:
 *