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Combine our "don't do this if no consensus" entryguards checks 

Suggested by asn on 22400 review.
This commit is contained in:
Nick Mathewson 2017-06-22 09:28:30 -04:00
parent 32e486de97
commit bdd267e74d
1 changed files with 22 additions and 23 deletions
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45
src/or/entrynodes.c
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@ -1093,6 +1093,18 @@ select_and_add_guard_item_for_sample(guard_selection_t *gs,
return added_guard;
}
/** Return true iff we need a consensus to maintain our */
static int
live_consensus_is_missing(const guard_selection_t *gs)
{
tor_assert(gs);
if (gs->type == GS_TYPE_BRIDGE) {
/* We don't update bridges from the consensus; they aren't there. */
return 0;
}
return networkstatus_get_live_consensus(approx_time()) == NULL;
}
/**
* Add new guards to the sampled guards in <b>gs</b> until there are
* enough usable filtered guards, but never grow the sample beyond its
@ -1105,18 +1117,10 @@ entry_guards_expand_sample(guard_selection_t *gs)
tor_assert(gs);
const or_options_t *options = get_options();
if (gs->type != GS_TYPE_BRIDGE) {
networkstatus_t *consensus = networkstatus_get_latest_consensus();
time_t now = approx_time();
if (consensus == NULL) {
log_info(LD_GUARD, "Not expanding the sample guard set; we have "
"no consensus.");
return NULL;
} else if (!networkstatus_consensus_reasonably_live(consensus, now)) {
log_info(LD_GUARD, "Not expanding the sample guard set; we have "
"a consensus, but it is far too old.");
return NULL;
}
if (live_consensus_is_missing(gs)) {
log_info(LD_GUARD, "Not expanding the sample guard set; we have "
"no live consensus.");
return NULL;
}
int n_sampled = smartlist_len(gs->sampled_entry_guards);
@ -1227,18 +1231,13 @@ sampled_guards_update_from_consensus(guard_selection_t *gs)
// It's important to use only a live consensus here; we don't want to
// make changes based on anything expired or old.
if (gs->type != GS_TYPE_BRIDGE) {
networkstatus_t *ns = networkstatus_get_live_consensus(approx_time());
if (! ns) {
log_info(LD_GUARD, "No live consensus; can't update "
"sampled entry guards.");
return;
} else {
log_info(LD_GUARD, "Updating sampled guard status based on received "
"consensus.");
}
if (live_consensus_is_missing(gs)) {
log_info(LD_GUARD, "Not updating the sample guard set; we have "
"no live consensus.");
return;
}
log_info(LD_GUARD, "Updating sampled guard status based on received "
"consensus.");
int n_changes = 0;