Function select_inchan_mpp

lightningd/invoice.c:649–687

select_inchan_mpp * * @brief fallback in case select_inchan cannot find a *single* * channel capable of accepting the payment as a whole. * Also the main routehint-selector if we are completely unpublished * (i.e. all our channels are unpublished), since if we are completely * unpublished then the payer cannot fall back to just directly routing * to us. */

 * to us.
 */
static struct route_info **select_inchan_mpp(const tal_t *ctx,
					     struct lightningd *ld,
					     struct amount_msat amount_needed,
					     struct routehint_candidate
					     *candidates)
{
	/* The total amount we have gathered for incoming channels.  */
	struct amount_msat gathered;
	/* Routehint array.  */
	struct route_info **routehints;

	gathered = AMOUNT_MSAT(0);
	routehints = tal_arr(ctx, struct route_info *, 0);

	/* Sort by rr_number, so we get fresh channels. */
	asort(candidates, tal_count(candidates), cmp_rr_number, ld);
	for (size_t i = 0; i < tal_count(candidates); i++) {
		if (amount_msat_greater_eq(gathered, amount_needed))
			break;

		/* Add to current routehints set.  */
		if (!amount_msat_add(&gathered, gathered, candidates[i].capacity)) {
			log_broken(ld->log,
				   "Gathered channel capacity overflow: "
				   "%s + %s",
				   type_to_string(tmpctx, struct amount_msat, &gathered),
				   type_to_string(tmpctx, struct amount_msat,
						  &candidates[i].capacity));
			continue;
		}
		tal_arr_expand(&routehints,
			       tal_dup(routehints, struct route_info,
				       candidates[i].r));
		/* Put to the back of the round-robin list */
		candidates[i].c->rr_number = ld->rr_counter++;
	}

	return routehints;
}

/* Encapsulating struct while we wait for gossipd to give us incoming channels */
struct chanhints {