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using System;
using System.Collections.Generic;
using System.Net;
using System.Net.Sockets;
using XUtliPoolLib;
namespace XMainClient
{
internal class XQueryServerState : XSingleton<XQueryServerState>
{
private readonly int TIMEOUT_VALUE = 5000;
public XQueryServerState.ServerStateResponseHandler CallbackHandler = null;
private Queue<IAsyncResult> m_CompleteAR;
private List<XQueryServerState.QueryInfo> m_QueryServerID;
private Socket m_Socket;
private class stateobj
{
public EndPoint remote = new IPEndPoint(0L, 0);
public byte[] buffer = new byte[64];
}
private class QueryInfo
{
public int serverID;
public int queryTime;
public int tryCount;
public string serverIP;
public int serverPort;
}
public delegate void ServerStateResponseHandler(int serverID, ServerStateEnum serverState, ServerFlagEnum serverFlag);
public XQueryServerState()
{
this.CallbackHandler = new XQueryServerState.ServerStateResponseHandler(this.PrintHandler);
this.m_Socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
this.m_CompleteAR = new Queue<IAsyncResult>();
this.m_QueryServerID = new List<XQueryServerState.QueryInfo>();
}
private byte[] int2bytes(int serverID)
{
return new byte[]
{
(byte)(serverID & 255),
(byte)(serverID >> 8 & 255),
(byte)(serverID >> 16 & 255),
(byte)(serverID >> 24 & 255)
};
}
private int bytes2int(byte[] a)
{
return (int)(a[0] + byte.MaxValue * (a[1] + byte.MaxValue * (a[2] + byte.MaxValue * a[3])));
}
public void Query(int serverID, string serverIP, int serverPort)
{
this.AddQueryRecord(serverID, serverIP, serverPort);
this.SendQueryProtocol(serverID, serverIP, serverPort);
}
private void SendQueryProtocol(int serverID, string serverIP, int serverPort)
{
try
{
this.m_Socket.SendTo(this.int2bytes(serverID), new IPEndPoint(IPAddress.Parse(serverIP), serverPort));
XQueryServerState.stateobj stateobj = new XQueryServerState.stateobj();
AsyncCallback callback = new AsyncCallback(this.OnRecv);
this.m_Socket.BeginReceiveFrom(stateobj.buffer, 0, stateobj.buffer.Length, SocketFlags.None, ref stateobj.remote, callback, stateobj);
}
catch (Exception ex)
{
XSingleton<XDebug>.singleton.AddLog("query protocol failed! + ", ex.Message, null, null, null, null, XDebugColor.XDebug_None);
}
}
public void ProcessQueryMessage()
{
this.ProcessResponse();
this.ProcessTimeoutRecord();
}
private void ProcessResponse()
{
while (this.m_CompleteAR.Count > 0)
{
IAsyncResult asyncResult = null;
Queue<IAsyncResult> completeAR = this.m_CompleteAR;
lock (completeAR)
{
asyncResult = this.m_CompleteAR.Dequeue();
}
try
{
XQueryServerState.stateobj stateobj = (XQueryServerState.stateobj)asyncResult.AsyncState;
int num = this.m_Socket.EndReceiveFrom(asyncResult, ref stateobj.remote);
bool flag = num > 0;
if (flag)
{
this.ProcessData(stateobj.buffer, num);
}
}
catch (Exception ex)
{
XSingleton<XDebug>.singleton.AddLog(ex.Message, null, null, null, null, null, XDebugColor.XDebug_None);
}
}
}
private void ProcessData(byte[] buffer, int length)
{
bool flag = length != 6;
if (flag)
{
XSingleton<XDebug>.singleton.AddErrorLog("Decode Query Server State Info error!", null, null, null, null, null);
}
else
{
int serverID = this.bytes2int(buffer);
this.RemoveQueryRecord(serverID);
this.CallbackHandler(serverID, this.DecodeServerState(buffer[4]), this.DecodeServerFlag(buffer[5]));
}
}
private void PrintHandler(int serverID, ServerStateEnum serverState, ServerFlagEnum serverFlag)
{
XSingleton<XDebug>.singleton.AddLog("server ", serverID.ToString(), " state: ", serverState.ToString(), " flag: ", serverFlag.ToString(), XDebugColor.XDebug_None);
}
private ServerFlagEnum DecodeServerFlag(byte p)
{
ServerFlagEnum result;
switch (p)
{
case 0:
result = ServerFlagEnum.MAINTAIN;
break;
case 1:
result = ServerFlagEnum.NEW;
break;
case 2:
result = ServerFlagEnum.NORMAL;
break;
case 3:
result = ServerFlagEnum.FULL;
break;
case 4:
result = ServerFlagEnum.SUGGEST;
break;
default:
result = ServerFlagEnum.MAINTAIN;
break;
}
return result;
}
private ServerStateEnum DecodeServerState(byte p)
{
ServerStateEnum result;
switch (p)
{
case 0:
result = ServerStateEnum.TIMEOUT;
break;
case 1:
result = ServerStateEnum.EMPTY;
break;
case 2:
result = ServerStateEnum.NORMAL;
break;
case 3:
result = ServerStateEnum.FULL;
break;
default:
result = ServerStateEnum.TIMEOUT;
break;
}
return result;
}
private void OnRecv(IAsyncResult ar)
{
Queue<IAsyncResult> completeAR = this.m_CompleteAR;
lock (completeAR)
{
this.m_CompleteAR.Enqueue(ar);
}
}
private void AddQueryRecord(int serverID, string serverIP, int serverPort)
{
XQueryServerState.QueryInfo queryInfo = new XQueryServerState.QueryInfo();
queryInfo.serverID = serverID;
queryInfo.queryTime = Environment.TickCount;
queryInfo.tryCount = 1;
queryInfo.serverIP = serverIP;
queryInfo.serverPort = serverPort;
this.m_QueryServerID.Add(queryInfo);
}
private void RemoveQueryRecord(int serverID)
{
for (int i = 0; i < this.m_QueryServerID.Count; i++)
{
bool flag = this.m_QueryServerID[i].serverID == serverID;
if (flag)
{
this.m_QueryServerID.RemoveAt(i);
break;
}
}
}
private void ProcessTimeoutRecord()
{
int tickCount = Environment.TickCount;
for (int i = this.m_QueryServerID.Count - 1; i >= 0; i--)
{
XQueryServerState.QueryInfo queryInfo = this.m_QueryServerID[i];
bool flag = tickCount > queryInfo.queryTime + this.TIMEOUT_VALUE;
if (flag)
{
bool flag2 = queryInfo.tryCount <= 3;
if (flag2)
{
queryInfo.tryCount++;
queryInfo.queryTime = Environment.TickCount;
this.SendQueryProtocol(queryInfo.serverID, queryInfo.serverIP, queryInfo.serverPort);
}
else
{
this.CallbackHandler(queryInfo.serverID, ServerStateEnum.TIMEOUT, ServerFlagEnum.MAINTAIN);
this.m_QueryServerID.RemoveAt(i);
}
}
}
}
}
}
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