public MyUdpRequestInfo Filter(ReceiveCache data, out int rest)
{
rest = 0;
var length = data.Total;
if (length <= 40)
{
return(null);
}
var key = Encoding.ASCII.GetString(data, 0, 4);
var sessionID = Encoding.ASCII.GetString(data, 4, 36);
var body = Encoding.UTF8.GetString(data, 40, length - 40);
return(new MyUdpRequestInfo(key, sessionID)
{
Value = body
});
}
public StringPackageInfo Filter(ReceiveCache data, out int rest)
{
rest = data.Total;
var current = data.Current;
var startByte = current.Array[current.Offset];
if ((startByte & 0x80) == 0x00) //data is fragmented by begin/end mark
{
rest--;
NextReceiveFilter = m_MarkReceiveFilter;
}
else if (startByte == 0xff)
{
rest--;
NextReceiveFilter = m_CloseMarkReceiveFilter;
}
else //data is fragmented by length
{
NextReceiveFilter = m_LenReceiveFilter;
}
return(null);
}
public StringRequestInfo Filter(ReceiveCache data, out int rest)
{
var current = data.Current;
rest = current.Count;
var flag = current.Array[current.Offset];
if (flag == m_BeginMarkA)
{
NextReceiveFilter = m_FilterA;
}
else if (flag == m_BeginMarkB)
{
NextReceiveFilter = m_FilterB;
}
else
{
State = FilterState.Error;
}
return(null);
}
void ProcessPackageWithSessionID(Socket listenSocket, IPEndPoint remoteEndPoint, ArraySegment <byte> receivedData)
{
TRequestInfo requestInfo;
string sessionID;
int rest;
try
{
var receiveData = new ReceiveCache();
receiveData.Add(receivedData);
requestInfo = this.m_UdpRequestFilter.Filter(receiveData, out rest);
}
catch (Exception exc)
{
if (AppServer.Logger.IsErrorEnabled)
{
AppServer.Logger.Error("Failed to parse UDP package!", exc);
}
return;
}
var udpRequestInfo = requestInfo as UdpRequestInfo;
if (rest > 0)
{
if (AppServer.Logger.IsErrorEnabled)
{
AppServer.Logger.Error("The output parameter rest must be zero in this case!");
}
return;
}
if (udpRequestInfo == null)
{
if (AppServer.Logger.IsErrorEnabled)
{
AppServer.Logger.Error("Invalid UDP package format!");
}
return;
}
if (string.IsNullOrEmpty(udpRequestInfo.SessionID))
{
if (AppServer.Logger.IsErrorEnabled)
{
AppServer.Logger.Error("Failed to get session key from UDP package!");
}
return;
}
sessionID = udpRequestInfo.SessionID;
var appSession = AppServer.GetSessionByID(sessionID);
if (appSession == null)
{
if (!DetectConnectionNumber(remoteEndPoint))
{
return;
}
var socketSession = new UdpSocketSession(listenSocket, remoteEndPoint, sessionID);
appSession = AppServer.CreateAppSession(socketSession);
if (appSession == null)
{
return;
}
if (!DetectConnectionNumber(remoteEndPoint))
{
return;
}
if (!AppServer.RegisterSession(appSession))
{
return;
}
Interlocked.Increment(ref m_ConnectionCount);
socketSession.Closed += OnSocketSessionClosed;
socketSession.Start();
}
else
{
var socketSession = appSession.SocketSession as UdpSocketSession;
//Client remote endpoint may change, so update session to ensure the server can find client correctly
socketSession.UpdateRemoteEndPoint(remoteEndPoint);
}
m_RequestHandler.ExecuteCommand(appSession, requestInfo);
}
