/**
* once failed, try after 5 min
* and (last write - last read) < 5s
* and (now - last read) < 5s // means not stuck
* and latency < 200ms, try after 30s
*/
public void ChooseNewServer()
{
SsServerInfo oldServer = _currentServer;
List<ServerStatus> servers = new List<ServerStatus>(_serverStatus.Values);
DateTime now = DateTime.Now;
foreach (var status in servers)
{
// all of failure, latency, (lastread - lastwrite) normalized to 1000, then
// 100 * failure - 2 * latency - 0.5 * (lastread - lastwrite)
status.score =
100 * 1000 * Math.Min(5 * 60, (now - status.lastFailure).TotalSeconds)
- 2 * 5 * (Math.Min(2000, status.latency.TotalMilliseconds) / (1 + (now - status.lastTimeDetectLatency).TotalSeconds / 30 / 10) +
-0.5 * 200 * Math.Min(5, (status.lastRead - status.lastWrite).TotalSeconds));
Logging.Debug(String.Format("server: {0} latency:{1} score: {2}", status.server.DisplayName(), status.latency, status.score));
}
ServerStatus max = null;
foreach (var status in servers)
{
if (max == null)
{
max = status;
}
else
{
if (status.score >= max.score)
{
max = status;
}
}
}
if (max != null)
{
_currentServer = max.server;
if (_currentServer != oldServer)
{
Console.WriteLine("HA switching to server: {0}", _currentServer.DisplayName());
}
Logging.Debug(String.Format("choosing server: {0}", _currentServer.DisplayName()));
}
}
private void RemoveExpiredSsServerInfoFromConfig(SsServerInfo serverInfo)
{
try
{
var currentConfiguration = _controller.GetCurrentConfiguration();
currentConfiguration.ServerInfos.Remove(serverInfo);
_controller.SaveServers(currentConfiguration.ServerInfos, currentConfiguration.localPort);
var aaa = string.Format("Expired ss-server ({0}) has been removed, {1} left", serverInfo.DisplayName(), currentConfiguration.ServerInfos.Count);
Shadowsocks.View.MenuViewController.ShowBalloonTip("Info", aaa, System.Windows.Forms.ToolTipIcon.Warning, 1000);
}
catch (Exception ex)
{
Logging.LogUsefulException(ex);
}
}
