/// <summary>
/// 发送服务器列表Ping请求
/// </summary>
/// <param name="hostname">主机名</param>
/// <param name="port">端口</param>
/// <returns></returns>
public ServerListPingResult ServerListPing(string hostname, ushort port)
{
if (State != MinecraftClientState.InTitle)
{
throw new InvalidOperationException($"invalid client state {State}, it should be {MinecraftClientState.InTitle}.");
}
const int timeout = 10000;
var timedOut = false;
var handshaked = false;
_logger.Info($"Pinging {hostname}, {port}");
var result = new ServerListPingResult
{
Delay = -1
};
DateTime time1;
TcpClient client = null;
ProtocolAdapter adapter = null;
try
{
client = new TcpClient();
client.Connect(hostname, port);
adapter = new ProtocolAdapter(client.GetStream(), PacketBoundTo.Server);
adapter.Start();
_ = Task.Run(async() => // timeout
{
await Task.Delay(timeout);
if (adapter.State != ProtocolState.Closed)
{
timedOut = true;
client.Close();
_logger.Warn($"{hostname}:{port} timed out");
}
});
adapter.WritePacket(new HandshakePacket //handshake
{
NextState = ProtocolState.Status,
ProtocolVersion = _protocolVersion,
ServerAddress = hostname,
ServerPort = port
});
adapter.WritePacket(new StatusRequestPacket());
var statusResponsePacket = (StatusResponsePacket)adapter.ReadPacket();
handshaked = true;
result.LoadContent(statusResponsePacket.Content);
time1 = DateTime.Now;
adapter.WritePacket(new StatusPingPacket {
Payload = time1.ToUnixTimeStamp()
});
if ((StatusPongPacket)adapter.ReadPacket() != null)
{
result.Delay = (int)(DateTime.Now - time1).TotalMinutes;
}
adapter.Close();
}
catch
{
if (!handshaked)
{
throw;
}
}
finally
{
adapter?.Dispose();
client?.Dispose();
}
if (timedOut)
{
_logger.Warn("Pinging timeout");
}
return(result);
}
