/** Look through the routerlist, and using the measured bandwidth cache count
* how many measured bandwidths we know. This is used to decide whether we
* ever trust advertised bandwidths for purposes of assigning flags. */
void
dirserv_count_measured_bws(const smartlist_t *routers)
{
/* Initialize this first */
routers_with_measured_bw = 0;
/* Iterate over the routerlist and count measured bandwidths */
SMARTLIST_FOREACH_BEGIN(routers, const routerinfo_t *, ri) {
/* Check if we know a measured bandwidth for this one */
if (dirserv_has_measured_bw(ri->cache_info.identity_digest)) {
++routers_with_measured_bw;
}
} SMARTLIST_FOREACH_END(ri);
}
/** Helper for dirserv_compute_performance_thresholds(): Decide whether to
* include a router in our calculations, and return true iff we should; the
* require_mbw parameter is passed in by
* dirserv_compute_performance_thresholds() and controls whether we ever
* count routers with only advertised bandwidths */
static int
router_counts_toward_thresholds(const node_t *node, time_t now,
const digestmap_t *omit_as_sybil,
int require_mbw)
{
/* Have measured bw? */
int have_mbw =
dirserv_has_measured_bw(node->identity);
uint64_t min_bw_kb = ABSOLUTE_MIN_BW_VALUE_TO_CONSIDER_KB;
const or_options_t *options = get_options();
if (options->TestingTorNetwork) {
min_bw_kb = (int64_t)options->TestingMinExitFlagThreshold / 1000;
}
return node->ri && router_is_active(node->ri, node, now) &&
!digestmap_get(omit_as_sybil, node->identity) &&
(dirserv_get_credible_bandwidth_kb(node->ri) >= min_bw_kb) &&
(have_mbw || !require_mbw);
}