Function gossmap_chan_get_capacity

common/gossmap.c:1475–1508

}

struct amount_msat gossmap_chan_get_capacity(const struct gossmap *map,
					     const struct gossmap_chan *c)
{
	struct gossip_hdr ghdr;
	u64 off;
	u16 type;
	struct amount_sat sat;
	struct amount_msat msat;

	if (gossmap_chan_is_localmod(map, c)) {
		/* Amount is *before* c->cann_off */
		off = c->cann_off - sizeof(u64);
		goto get_amount;
	}

	/* Skip over this record to next; expect a gossip_store_channel_amount */
	off = c->cann_off - sizeof(ghdr);
	map_copy(map, off, &ghdr, sizeof(ghdr));
	off += sizeof(ghdr) + be16_to_cpu(ghdr.len);

	/* We don't allow loading a channel unless it has capacity field! */
	type = map_be16(map, off + sizeof(ghdr));
	assert(type == WIRE_GOSSIP_STORE_CHANNEL_AMOUNT);

	off += sizeof(ghdr) + sizeof(be16);

get_amount:
	/* Shouldn't overflow */
	sat = amount_sat(map_be64(map, off));
	if (!amount_sat_to_msat(&msat, sat))
		errx(1, "invalid capacity %s", fmt_amount_sat(tmpctx, sat));

	return msat;
}

struct gossmap_chan *gossmap_nth_chan(const struct gossmap *map,
				      const struct gossmap_node *node,