Function gossip_refresh_network

gossipd/gossipd.c:610–665

BOLT #7: * * A node: * - if the `timestamp` of the latest `channel_update` in * either direction is older than two weeks (1209600 seconds): * - MAY prune the channel. * - MAY ignore the channel. */

 *     - MAY ignore the channel.
 */
static void gossip_refresh_network(struct daemon *daemon)
{
	u64 now = gossip_time_now(daemon->rstate).ts.tv_sec;
	s64 highwater;
	struct node *n;

	/* Send out 1 day before deadline */
	highwater = now - (GOSSIP_PRUNE_INTERVAL(daemon->rstate->dev_fast_gossip)
			   - GOSSIP_BEFORE_DEADLINE(daemon->rstate->dev_fast_gossip_prune));

	/* Schedule next run now */
	notleak(new_reltimer(&daemon->timers, daemon,
			     time_from_sec(GOSSIP_PRUNE_INTERVAL(daemon->rstate->dev_fast_gossip_prune)/4),
			     gossip_refresh_network, daemon));

	/* Find myself in the network */
	n = get_node(daemon->rstate, &daemon->id);
	if (n) {
		/* Iterate through all outgoing connection and check whether
		 * it's time to re-announce */
		struct chan_map_iter i;
		struct chan *c;

		for (c = first_chan(n, &i); c; c = next_chan(n, &i)) {
			struct half_chan *hc;
			int direction;

			if (!local_direction(daemon->rstate, c, &direction))
				continue;

			hc = &c->half[direction];

			if (!is_halfchan_defined(hc)) {
				/* Connection is not announced yet, so don't even
				 * try to re-announce it */
				continue;
			}

			if (hc->bcast.timestamp > highwater) {
				/* No need to send a keepalive update message */
				continue;
			}

			status_debug("Sending keepalive channel_update"
				     " for %s/%u",
				     type_to_string(tmpctx,
						    struct short_channel_id,
						    &c->scid), direction);
			refresh_local_channel(daemon, c, direction);
		}
	}

	/* Now we've refreshed our channels, we can prune without clobbering
	 * them */
	route_prune(daemon->rstate);
}

/* Disables all channels connected to our node. */