Function routehint_step_cb

plugins/libplugin-pay.c:2783–2864

}

static void routehint_step_cb(struct routehints_data *d, struct payment *p)
{
	struct route_hop hop;
	const struct payment *root = payment_root(p);
	struct gossmap *map;
	if (p->step == PAYMENT_STEP_INITIALIZED) {
		if (root->routes == NULL)
			return payment_continue(p);

		/* We filter out non-functional routehints once at the
		 * beginning, and every other payment will filter out the
		 * exluded ones on the fly. */
		if (p->parent == NULL) {
			map = get_gossmap(p->plugin);
			d->routehints = filter_routehints(
			    map, p, d, p->local_id, p->routes);
			/* filter_routehints modifies the array, but
			 * this could trigger a resize and the resize
			 * could trigger a realloc.
			 * Keep the invoice pointer up-to-date.
			 * FIXME: We should really consider that if we are
			 * mutating p->routes, maybe we should
			 * drop d->routehints and just use p->routes
			 * directly.
			 * It is probably not a good idea to *copy* the
			 * routehints: other paymods are interested in
			 * p->routes, and if the routehints system
			 * itself adds or removes routehints from its
			 * copy, the *actual* number of routehints that we
			 * end up using is the one that the routehints paymod
			 * is maintaining and traversing, and it is *that*
			 * set of routehints that is the important one.
			 * So rather than copying the array of routehints
			 * in paymod, paymod should use (and mutate) the
			 * p->routes array, and
			 */
			p->routes = d->routehints;

			paymod_log(p, LOG_DBG,
				   "After filtering routehints we're left with "
				   "%zu usable hints",
				   tal_count(d->routehints));
			    /* Do not continue normally, instead go and check if
			     * we can reach the destination directly. */
			    return routehint_check_reachable(p);
		}

		routehint_pre_getroute(d, p);
	} else if (p->step == PAYMENT_STEP_GOT_ROUTE && d->current_routehint != NULL) {
		/* Now it's time to stitch the two partial routes together. */
		struct amount_msat dest_amount;
		struct route_info *routehint = d->current_routehint;
		struct route_hop *prev_hop;
		for (ssize_t i = 0; i < tal_count(routehint); i++) {
			prev_hop = &p->route[tal_count(p->route)-1];
			if (!route_msatoshi(&dest_amount, p->amount,
				    routehint + i + 1,
					    tal_count(routehint) - i - 1)) {