Function assign_blame

plugins/libplugin-pay.c:1507–1535

From the docs: * * - *erring_index*: The index of the node along the route that * reported the error. 0 for the local node, 1 for the first hop, * and so on. * * The only difficulty is mapping the erring_index to the correct hop. * We split into the erring node, and the error channel, since they're * used in different contexts. NULL error_channel means it's the final * node, whose err

 * node, whose errors are treated differently.
 */
static bool assign_blame(const struct payment *p,
			 const struct node_id **errnode,
			 const struct route_hop **errchan)
{
	int index;

	if (p->result->erring_index == NULL)
		return false;

	index = *p->result->erring_index;

	/* BADONION errors are reported on behalf of the next node. */
	if (p->result->failcode & BADONION)
		index++;

	/* Final node *shouldn't* report BADONION, but don't assume. */
	if (index >= tal_count(p->route)) {
		*errchan = NULL;
		*errnode = &p->route[tal_count(p->route) - 1].node_id;
		return true;
	}

	*errchan = &p->route[index];
	if (index == 0)
		*errnode = p->local_id;
	else
		*errnode = &p->route[index - 1].node_id;
	return true;
}

/* Fix up the channel_update to include the type if it doesn't currently have
 * one. See ElementsProject/lightning#1730 and lightningnetwork/lnd#1599 for the