Function payment_getroute

plugins/libplugin-pay.c:856–932

}

static struct command_result *payment_getroute(struct payment *p)
{
	const struct gossmap_node *dst, *src;
	struct amount_msat fee;
	const char *errstr;
	struct gossmap *gossmap;

	/* If we retry the getroute call we might already have a route, so
	 * free an eventual stale route. */
	p->route = tal_free(p->route);

	gossmap = get_gossmap(p);

	dst = gossmap_find_node(gossmap, p->getroute->destination);
	if (!dst) {
		put_gossmap(p);
		return payment_fail(
			p, "Unknown destination %s",
			fmt_node_id(tmpctx, p->getroute->destination));
	}

	/* If we don't exist in gossip, routing can't happen. */
	src = gossmap_find_node(gossmap, p->local_id);
	if (!src) {
		put_gossmap(p);
		return payment_fail(p, "We don't have any channels");
	}

	p->route = route(p, gossmap, src, dst, p->getroute->amount, p->getroute->cltv,
			 p->getroute->riskfactorppm / 1000000.0, p->getroute->max_hops,
			 p, &errstr);
	put_gossmap(p);

	if (!p->route) {
		return payment_fail(p, "%s", errstr);
	}

	/* OK, now we *have* a route */
	p->step = PAYMENT_STEP_GOT_ROUTE;

	if (tal_count(p->route) == 0) {
		payment_root(p)->abort = true;
		return payment_fail(p, "Empty route returned by getroute, are you "
				    "trying to pay yourself?");
	}

	fee = payment_route_fee(p);

	/* Ensure that our fee and CLTV budgets are respected. */
	if (amount_msat_greater(fee, p->constraints.fee_budget)) {
		p->route = tal_free(p->route);
		return payment_fail(
			p, "Fee exceeds our fee budget: %s > %s, discarding route",
			fmt_amount_msat(tmpctx, fee),
			fmt_amount_msat(tmpctx, p->constraints.fee_budget));
	}

	if (p->route[0].delay > p->constraints.cltv_budget) {