/// <summary>
/// UDP打洞过程
/// 假设A想连接B.首先A发送打洞消息给Server,让Server告诉B有人想与你建立通话通道,Server将A的IP信息转发给B
/// B收到命令后向A发一个UDP包,此时B的NAT会建立一个与A通讯的Session. 然后A再次向B发送UDP包B就能收到了
/// </summary>
public void HolePunching(User user)
{
//A:自己; B:参数user
//A发送打洞消息给服务器,请求与B打洞
C2S_HolePunchingRequestMessage msg = new C2S_HolePunchingRequestMessage(_LocalUserName, user.UserName);
SendMessage(msg, _hostPoint);
Thread.Sleep(2000);//等待对方发送UDP包并建立Session
//再向对方发送确认消息，如果对方收到会发送一个P2P_HolePunchingResponse确认消息，此时打洞成功
P2P_HolePunchingTestMessage confirmMessage = new P2P_HolePunchingTestMessage(_LocalUserName);
SendMessage(confirmMessage, user);
}
public void SendMessage(MessageBase msg, User user)
{
SendMessage(msg, user.NetPoint);
}
//线程主方法
private void Run()
{
byte[] msgBuffer;
while (true)
{
msgBuffer = _server.Receive(ref _remotePoint); //接受消息
try
{
//将消息转换为对象
object msgObject = ObjectSerializer.Deserialize(msgBuffer);
if (msgObject == null) continue;
Type msgType = msgObject.GetType();
DoWriteLog("接收到消息:" + msgType);
DoWriteLog("From:" + _remotePoint);
//新用户登录
if (msgType == typeof(C2S_LoginMessage))
{
var lginMsg = (C2S_LoginMessage)msgObject;
DoWriteLog(string.Format("用户’{0}’已登录!", lginMsg.FromUserName));
// 添加用户到列表
var userEndPoint = new IPEndPoint(_remotePoint.Address, _remotePoint.Port);
var user = new User(lginMsg.FromUserName, userEndPoint);
_userList.Add(user);
DoUserChanged(_userList);
//通知所有人，有新用户登录
var msgNewUser = new S2C_UserAction(user, UserAction.Login);
foreach (User u in _userList)
{
if (u.UserName == user.UserName) //如果是自己，发送所有在线用户列表
SendMessage(new S2C_UserListMessage(_userList), u.NetPoint);
else
SendMessage(msgNewUser, u.NetPoint);
}
}
else if (msgType == typeof(C2S_LogoutMessage))
{
var lgoutMsg = (C2S_LogoutMessage)msgObject;
DoWriteLog(string.Format("用户’{0}’已登出!", lgoutMsg.FromUserName));
// 从列表中删除用户
User logoutUser = _userList.Find(lgoutMsg.FromUserName);
if (logoutUser != null) _userList.Remove(logoutUser);
DoUserChanged(_userList);
//通知所有人，有用户登出
var msgNewUser = new S2C_UserAction(logoutUser, UserAction.Logout);
foreach (User u in _userList)
SendMessage(msgNewUser, u.NetPoint);
}
else if (msgType == typeof(C2S_HolePunchingRequestMessage))
{
//接收到A给B打洞的消息,打洞请求，由客户端发送给服务器端
var msgHoleReq = (C2S_HolePunchingRequestMessage)msgObject;
User userA = _userList.Find(msgHoleReq.FromUserName);
User userB = _userList.Find(msgHoleReq.ToUserName);
// 发送打洞(Punching Hole)消息
DoWriteLog(string.Format("用户:[{0} IP:{1}]想与[{2} IP:{3}]建立对话通道.",
userA.UserName, userA.NetPoint,
userB.UserName, userB.NetPoint));
//由Server发送消息给B,将A的IP的IP地址信息告诉B,然后由B发送一个测试消息给A.
var msgHolePunching = new S2C_HolePunchingMessage(_remotePoint);
SendMessage(msgHolePunching, userB.NetPoint); //Server->B
}
else if (msgType == typeof(C2S_GetUsersMessage))
{
// 发送当前用户信息
var srvResMsg = new S2C_UserListMessage(_userList);
SendMessage(srvResMsg, _remotePoint);
}
}
catch (Exception ex) { DoWriteLog(ex.Message); }
}
}
public void Remove(User user)
{
InnerList.Remove(user);
}
public void Add(User user)
{
InnerList.Add(user);
}
public S2C_UserAction(User user, UserAction action)
{
_User = user;
_Action = action;
}
