Function gossmap_apply_localmods

common/gossmap.c:1220–1329

Apply localmods to this map */

/* Apply localmods to this map */
void gossmap_apply_localmods(struct gossmap *map,
			     struct gossmap_localmods *localmods)
{
	size_t n = tal_count(localmods->mods);

	assert(!map->local_announces);
	map->local_announces = localmods->local_announces;
	map->local_updates = tal_arr(map, u8, 0);

	for (size_t i = 0; i < n; i++) {
		struct localmod *mod = &localmods->mods[i];
		struct gossmap_chan *chan;

		/* Find gossmap entry which this applies to. */
		chan = gossmap_find_chan(map, &mod->scid);
		/* If it doesn't exist, are we supposed to create a local one? */
		if (!chan) {
			if (!localmod_is_local_chan(mod))
				continue;

			/* Create new channel, pointing into local. */
			chan = add_channel(map, map->map_size + mod->local_off, 0, NULL);
		}

		/* Save old, update any fields they wanted to change */
		for (size_t h = 0; h < 2; h++) {
			const struct localmod_changes *c = &mod->changes[h];
			/* Default values all zero, disabled */
			u32 timestamp = 0;
			u8 message_flags = ROUTING_OPT_HTLC_MAX_MSAT, channel_flags = h | ROUTING_FLAGS_DISABLED;
			u16 cltv_expiry_delta = 0;
			u32 fee_base_msat = 0, fee_proportional_millionths = 0;
			struct amount_msat htlc_minimum_msat = AMOUNT_MSAT(0),
				htlc_maximum_msat = AMOUNT_MSAT(0);
			const u8 *cupdatemsg;
			secp256k1_ecdsa_signature fake_signature;
			struct bitcoin_blkid fake_blkid;
			struct short_channel_id_dir scidd;
			u64 off;
			bool any_set = false;

			/* Save existing versions */
			mod->orig[h] = chan->half[h];
			mod->orig_cupdate_off[h] = chan->cupdate_off[h];

			/* If we have a previous one, base it on that! */
			if (gossmap_chan_set(chan, h)) {
				gossmap_chan_get_update_details(map, chan, h,
								&timestamp,
								&message_flags,
								&channel_flags,
								&cltv_expiry_delta,
								&fee_base_msat,
								&fee_proportional_millionths,
								&htlc_minimum_msat,
								&htlc_maximum_msat);
				any_set = true;
			}