Function send_htlc_out

lightningd/peer_htlcs.c:577–634

Returns failmsg, or NULL on success. */

/* Returns failmsg, or NULL on success. */
const u8 *send_htlc_out(const tal_t *ctx,
			struct channel *out,
			struct amount_msat amount, u32 cltv,
			struct amount_msat final_msat,
			const struct sha256 *payment_hash,
			const struct pubkey *blinding,
			u64 partid,
			u64 groupid,
			const u8 *onion_routing_packet,
			struct htlc_in *in,
			struct htlc_out **houtp)
{
	u8 *msg;

	*houtp = NULL;

	if (!channel_can_add_htlc(out)) {
		log_info(out->log, "Attempt to send HTLC but not ready (%s)",
			 channel_state_name(out));
		return towire_unknown_next_peer(ctx);
	}

	if (!out->owner) {
		log_info(out->log, "Attempt to send HTLC but unowned (%s)",
			 channel_state_name(out));
		return towire_temporary_channel_failure(ctx,
							get_channel_update(out));
	}

	if (!topology_synced(out->peer->ld->topology)) {
		log_info(out->log, "Attempt to send HTLC but still syncing"
			 " with bitcoin network");
		return towire_temporary_node_failure(ctx);
	}

	/* Make peer's daemon own it, catch if it dies. */
	*houtp = new_htlc_out(out->owner, out, amount, cltv,
			      payment_hash, onion_routing_packet,
			      blinding, in == NULL,
			      final_msat,
			      partid, groupid, in);
	tal_add_destructor(*houtp, destroy_hout_subd_died);

	/* Give channel 30 seconds to commit this htlc. */
	if (!IFDEV(out->peer->ld->dev_no_htlc_timeout, 0)) {
		(*houtp)->timeout = new_reltimer(out->peer->ld->timers,
						 *houtp, time_from_sec(30),
						 htlc_offer_timeout,
						 *houtp);
	}

	msg = towire_channeld_offer_htlc(out, amount, cltv, payment_hash,
					onion_routing_packet, blinding);
	subd_req(out->peer->ld, out->owner, take(msg), -1, 0, rcvd_htlc_reply,
		 *houtp);

	return NULL;
}