Function direct_pay_override

plugins/libplugin-pay.c:3195–3240

			  shadow_route_init, shadow_route_cb);

static void direct_pay_override(struct payment *p) {

	/* The root has performed the search for a direct channel. */
	struct payment *root = payment_root(p);
	struct direct_pay_data *d;
	struct channel_hint *hint = NULL;

	/* If we were unable to find a direct channel we don't need to do
	 * anything. */
	d = payment_mod_directpay_get_data(root);

	if (d->chan == NULL)
		return payment_continue(p);

	/* If we have a channel we need to make sure that it still has
	 * sufficient capacity. Look it up in the channel_hints. */
	for (size_t i=0; i<tal_count(root->channel_hints); i++) {
		struct short_channel_id_dir *cur = &root->channel_hints[i].scid;
		if (short_channel_id_eq(&cur->scid, &d->chan->scid) &&
		    cur->dir == d->chan->dir) {
			hint = &root->channel_hints[i];
			break;
		}
	}

	if (hint && hint->enabled &&
	    amount_msat_greater(hint->estimated_capacity, p->amount)) {
		/* Now build a route that consists only of this single hop */
		p->route = tal_arr(p, struct route_hop, 1);
		p->route[0].amount = p->amount;
		p->route[0].delay = p->getroute->cltv;
		p->route[0].scid = hint->scid.scid;
		p->route[0].direction = hint->scid.dir;
		p->route[0].node_id = *p->destination;
		paymod_log(p, LOG_DBG,
			   "Found a direct channel (%s) with sufficient "
			   "capacity, skipping route computation.",
			   type_to_string(tmpctx, struct short_channel_id_dir,
					  &hint->scid));

		payment_set_step(p, PAYMENT_STEP_GOT_ROUTE);
	}


	payment_continue(p);
}

/* Now that we have the listpeers result for the root payment, let's search
 * for a direct channel that is a) connected and b) in state normal. We will