void CAddrMan::ResolveCollisions_()
{
for (std::set<int>::iterator it = m_tried_collisions.begin(); it != m_tried_collisions.end();) {
int id_new = *it;
bool erase_collision = false;
// If id_new not found in mapInfo remove it from m_tried_collisions
if (mapInfo.count(id_new) != 1) {
erase_collision = true;
} else {
CAddrInfo& info_new = mapInfo[id_new];
// Which tried bucket to move the entry to.
int tried_bucket = info_new.GetTriedBucket(nKey);
int tried_bucket_pos = info_new.GetBucketPosition(nKey, false, tried_bucket);
if (!info_new.IsValid()) { // id_new may no longer map to a valid address
erase_collision = true;
} else if (vvTried[tried_bucket][tried_bucket_pos] != -1) { // The position in the tried bucket is not empty
// Get the to-be-evicted address that is being tested
int id_old = vvTried[tried_bucket][tried_bucket_pos];
CAddrInfo& info_old = mapInfo[id_old];
// Has successfully connected in last X hours
if (GetAdjustedTime() - info_old.nLastSuccess < ADDRMAN_REPLACEMENT_HOURS*(60*60)) {
erase_collision = true;
} else if (GetAdjustedTime() - info_old.nLastTry < ADDRMAN_REPLACEMENT_HOURS*(60*60)) { // attempted to connect and failed in last X hours
// Give address at least 60 seconds to successfully connect
if (GetAdjustedTime() - info_old.nLastTry > 60) {
LogPrint(BCLog::ADDRMAN, "Replacing %s with %s in tried table\n", info_old.ToString(), info_new.ToString());
// Replaces an existing address already in the tried table with the new address
Good_(info_new, false, GetAdjustedTime());
erase_collision = true;
}
} else if (GetAdjustedTime() - info_new.nLastSuccess > ADDRMAN_TEST_WINDOW) {
// If the collision hasn't resolved in some reasonable amount of time,
// just evict the old entry -- we must not be able to
// connect to it for some reason.
LogPrint(BCLog::ADDRMAN, "Unable to test; replacing %s with %s in tried table anyway\n", info_old.ToString(), info_new.ToString());
Good_(info_new, false, GetAdjustedTime());
erase_collision = true;
}
} else { // Collision is not actually a collision anymore
Good_(info_new, false, GetAdjustedTime());
erase_collision = true;
}
}
if (erase_collision) {
m_tried_collisions.erase(it++);
} else {
it++;
}
}
}
// Simulates connection failure so that we can test eviction of offline nodes
void SimConnFail(CService& addr)
{
int64_t nLastSuccess = 1;
Good_(addr, true, nLastSuccess); // Set last good connection in the deep past.
bool count_failure = false;
int64_t nLastTry = GetAdjustedTime()-61;
Attempt(addr, count_failure, nLastTry);
}
