protected async Task <SessionStatus> CheckStatus(int timeoutMs = ApiServices.DefaultTimeout)
{
try
{
// Cancel previous request (if it still in progress)
// PC connections can be changed on a current moment. Should be used new connection for request
// Info: WebRequest can use not more than 2 simultaneous connections to same host
__RequestCancellationSource?.Cancel();
if (!__Credentials.IsUserLoggedIn())
{
return(null); // User not loged-in () no registered sesion - nonthing to check
}
// send request to rest server
try
{
__RequestCancellationSource = new CancellationTokenSource();
SessionStatus acc = await ApiServices.Instance.SessionStatusAsync(__RequestCancellationSource.Token, timeoutMs);
if (acc != null)
{
__IsStatusReceived = true;
}
return(acc);
}
finally
{
__LastCheckTime = DateTime.Now;
__RequestCancellationSource = null;
}
}
catch (IVPNRestRequestApiException ex)
{
Logging.Info($"{ex}");
if (ex.ApiStatusCode == ApiStatusCode.SessionNotFound)
{
OnSessionRequestError(ex);
}
throw;
}
catch (Exception ex)
{
Logging.Info($"Error checking account status: {ex}");
throw;
}
}
private async Task StatusTimerElapsed()
{
__TimerAccountCheck.Stop();
if (!__IsActive)
{
return;
}
SessionStatus retSessionStatus = null;
try
{
// request not often than once per 'MinCheckIntervalMs'
if (__IsStatusReceived && (DateTime.Now - __LastCheckTime).TotalMilliseconds < MinCheckIntervalMs)
{
return;
}
// request acount status
try
{
var account = await CheckStatus();
if (account != null)
{
retSessionStatus = account;
}
}
catch
{
retSessionStatus = null;
// IGNORE ALLL !!!
}
if (!__IsActive)
{
return;
}
if (retSessionStatus != null)
{
OnSessionStatusReceived(retSessionStatus);
}
}
catch (Exception ex)
{
Logging.Info($"{ex}");
}
finally
{
__TimerAccountCheck.Interval = DefaultCheckIntervalMs;
if (__IsActive)
{
// calculate next account check time based on 'ActiveUtil'
if (retSessionStatus != null)
{
double accountAliveMsLeft = (retSessionStatus.ActiveUtil - DateTime.Now).TotalMilliseconds;
if (accountAliveMsLeft > 0)
{
if (accountAliveMsLeft < DefaultCheckIntervalMs)
{
__TimerAccountCheck.Interval = accountAliveMsLeft;
}
}
}
__TimerAccountCheck.Start();
}
}
}