Method getHostStatus

src/proxy/HostStatus.cc:322–380

retrieve the named host status.

// retrieve the named host status.
HostStatRec *
HostStatus::getHostStatus(const std::string_view name)
{
  HostStatRec *_status = nullptr;
  time_t       now     = time(0);
  bool         lookup  = false;

  // if host_statuses is empty, just return
  // a nullptr as there is no need to lock
  // and search.  A return of nullptr indicates
  // to the caller that the host is available,
  // HOST_STATUS_UP.
  if (hosts_statuses.empty()) {
    return _status;
  }

  // the hash table value pointer has the TSHostStatus value.
  ink_rwlock_rdlock(&host_status_rwlock);
  {
    auto it = hosts_statuses.find(std::string(name));
    lookup  = it != hosts_statuses.end();
    if (lookup) {
      _status = it->second;
    }
  }
  ink_rwlock_unlock(&host_status_rwlock);

  // if the host was marked down and it's down_time has elapsed, mark it up.
  if (lookup && _status->status == TSHostStatus::TS_HOST_STATUS_DOWN) {
    unsigned int reasons = _status->reasons;
    if ((_status->reasons & Reason::ACTIVE) && _status->active_down_time > 0) {
      if ((_status->active_down_time + _status->active_marked_down) < now) {
        Dbg(dbg_ctl_host_statuses, "name: %.*s, now: %ld, down_time: %d, marked_down: %ld, reason: %s", int(name.size()),
            name.data(), now, _status->active_down_time, _status->active_marked_down, Reason::ACTIVE_REASON);
        setHostStatus(name, TSHostStatus::TS_HOST_STATUS_UP, 0, Reason::ACTIVE);
        reasons ^= Reason::ACTIVE;
      }
    }
    if ((_status->reasons & Reason::LOCAL) && _status->local_down_time > 0) {
      if ((_status->local_down_time + _status->local_marked_down) < now) {
        Dbg(dbg_ctl_host_statuses, "name: %.*s, now: %ld, down_time: %d, marked_down: %ld, reason: %s", int(name.size()),
            name.data(), now, _status->local_down_time, _status->local_marked_down, Reason::LOCAL_REASON);
        setHostStatus(name, TSHostStatus::TS_HOST_STATUS_UP, 0, Reason::LOCAL);
        reasons ^= Reason::LOCAL;
      }
    }
    if ((_status->reasons & Reason::MANUAL) && _status->manual_down_time > 0) {
      if ((_status->manual_down_time + _status->manual_marked_down) < now) {
        Dbg(dbg_ctl_host_statuses, "name: %.*s, now: %ld, down_time: %d, marked_down: %ld, reason: %s", int(name.size()),
            name.data(), now, _status->manual_down_time, _status->manual_marked_down, Reason::MANUAL_REASON);
        setHostStatus(name, TSHostStatus::TS_HOST_STATUS_UP, 0, Reason::MANUAL);
        reasons ^= Reason::MANUAL;
      }
    }
    _status->reasons = reasons;
  }

  return _status;