Function send_htlc_out

lightningd/peer_htlcs.c:702–771

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 *path_key,
			const struct tlv_field *extra_tlvs,
			u64 partid,
			u64 groupid,
			const u8 *onion_routing_packet,
			struct htlc_in *in,
			struct htlc_out **houtp)
{
	u8 *msg, *raw_tlvs = NULL;

	*houtp = NULL;

	if (!channel_state_can_add_htlc(out->state)) {
		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,
							channel_update_for_error(tmpctx, in, out));
	}

	/* Note: we allow outgoing HTLCs before sync, for fast startup. */
	if (!topology_synced(out->peer->ld->topology)) {
		log_debug(out->log, "Sending HTLC while still syncing"
			  " with bitcoin network (%u vs %u)",
			  get_block_height(out->peer->ld->topology),
			  get_network_blockheight(out->peer->ld->topology));
	}

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

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

	if (extra_tlvs) {
		raw_tlvs = tal_arr(tmpctx, u8, 0);
		towire_tlvstream_raw(&raw_tlvs,