Function path_to_node

plugins/establish_onion_path.c:167–225

}

static const struct pubkey *path_to_node(const tal_t *ctx,
					 struct command *cmd,
					 struct gossmap *gossmap,
					 struct plugin *plugin,
					 const char *buf,
					 const jsmntok_t *listpeers,
					 const struct pubkey *local_id,
					 const struct pubkey *dst_key)
{
	struct route_hop *r;
	const struct dijkstra *dij;
	const struct gossmap_node *src;
	const struct gossmap_node *dst;
	struct pubkey *nodes;
	struct gossmap_localmods *mods;
	struct node_id local_nodeid, dst_nodeid;

	node_id_from_pubkey(&local_nodeid, local_id);
	node_id_from_pubkey(&dst_nodeid, dst_key);
	mods = gossmods_from_listpeers(tmpctx, cmd->plugin, gossmap, &local_nodeid, buf, listpeers);

	gossmap_apply_localmods(gossmap, mods);
	dst = gossmap_find_node(gossmap, &dst_nodeid);
	if (!dst)
		goto fail;

	/* If we don't exist in gossip, routing can't happen. */
	src = gossmap_find_node(gossmap, &local_nodeid);
	if (!src)
		goto fail;

	dij = dijkstra(tmpctx, gossmap, dst, AMOUNT_MSAT(0), 0,
		       can_carry_onionmsg, route_score_shorter, NULL);

	r = route_from_dijkstra(tmpctx, gossmap, dij, src, AMOUNT_MSAT(0), 0);
	if (!r)
		goto fail;

	nodes = tal_arr(ctx, struct pubkey, tal_count(r) + 1);
	nodes[0] = *local_id;
	plugin_log(plugin, LOG_DBG, "Found path to %s: %s(us)",
		   fmt_node_id(tmpctx, &dst_nodeid),
		   fmt_pubkey(tmpctx, local_id));
	for (size_t i = 0; i < tal_count(r); i++) {
		if (!pubkey_from_node_id(&nodes[i+1], &r[i].node_id)) {
			plugin_err(plugin, "Could not convert nodeid %s",
				   fmt_node_id(tmpctx, &r[i].node_id));
		}
		plugin_log(plugin, LOG_DBG, "-> %s",
			   fmt_node_id(tmpctx, &r[i].node_id));
	}

	gossmap_remove_localmods(gossmap, mods);
	return nodes;

fail:
	gossmap_remove_localmods(gossmap, mods);
	return NULL;