public int Encode(byte[] buf, int size)
{
if (size < 8)
{
return(-1);
}
KCP.ikcp_encode32u(buf, 0, (uint)cmd);
if (cmd == KcpCmd.KCP_CMD_CONNECT_REQ)
{
return(4);
}
KCP.ikcp_encode32u(buf, 4, conv);
return(8);
}
/// <summary>
/// 发送数据。发送时，默认在头部加上4字节的key
/// </summary>
/// <param name="buf"></param>
public void Send(byte[] buf)
{
byte[] newbuf = new byte[buf.Length + 4];
//把key附上，服务端合法性检测用
KCP.ikcp_encode32u(newbuf, 0, (uint)m_Key);
Array.Copy(buf, 0, newbuf, 4, buf.Length);
m_LastSendTimestamp = UnityEngine.Time.time;
m_Kcp.Send(newbuf);
m_NeedUpdateFlag = true;
var e = Event;
if (e != null)
{
e(UdpClientEvents.Send, buf);
}
}
private void ProcessRecvQueue()
{
while (!RecvQueue.IsEmpty)
{
SocketAsyncEventArgs e = null;
bool isSuccess = RecvQueue.TryDequeue(out e);
if (!isSuccess || e == null)
{
continue;
}
if (e.BytesTransferred == 0)
{
mSAEPool.PutObject(e);
continue;
}
//handshake with {0,0,0,0} at the first
if (Helper.IsHandshakeDataRight(e.Buffer, e.Offset, e.BytesTransferred))
{
uint conv = Helper.iclock();
var newSession = new KCPClientSession(conv);
newSession.ClientEndPoint = e.RemoteEndPoint;
newSession.KCPOutput = SendWithSession;
newSession.RecvDataHandler = RecvDataHandler;
mSessions.TryAdd(conv, newSession);
KCP.ikcp_encode32u(e.Buffer, e.BytesTransferred, conv);
e.SetBuffer(0, e.BytesTransferred + 4);
if (!mServerSocket.SendToAsync(e))
{
ProcessSend(e);
}
Console.WriteLine("Handshake from:" + e.RemoteEndPoint.ToString());
}
else
{
uint conv = 0;
KCP.ikcp_decode32u(e.Buffer, e.Offset, ref conv);
KCPClientSession session = null;
mSessions.TryGetValue(conv, out session);
if (session != null)
{
session.processRecvQueue(e);
}
mSAEPool.PutObject(e);
}
}
}
//发送握手数据 16字节 8字节头+4字节index+4字节key
private void SendHandshake()
{
if (UdpLibConfig.DebugLevel != (int)UdpLibLogLevel.None)
{
#if DEBUG
Console.WriteLine("发送握手数据");
#endif
}
Interlocked.Increment(ref m_pktCounter);
byte[] buf = new byte[UdpLibConfig.HandshakeDataSize + 4];
Array.Copy(UdpLibConfig.HandshakeHeadData, buf, UdpLibConfig.HandshakeHeadData.Length);
KCP.ikcp_encode32u(buf, UdpLibConfig.HandshakeHeadData.Length, m_NetIndex);
KCP.ikcp_encode32u(buf, UdpLibConfig.HandshakeHeadData.Length + 4, (uint)m_Key);
KCP.ikcp_encode32u(buf, UdpLibConfig.HandshakeHeadData.Length + 8, (uint)m_pktCounter);
//m_UdpClient.Send(buf, buf.Length);
m_UdpClient.BeginSend(buf, buf.Length, server_addr, (IAsyncResult iar) => { m_UdpClient.EndSend(iar); }, null);
#if DEV
string s = string.Format("{0},发送握手数据,{1}", m_NetIndex, m_pktCounter.ToString());
IRQLog.AppLog.Log(s);
Console.WriteLine(s);
#endif
}
// 测试用例
static void KCPTest(int mode)
{
// 创建模拟网络：丢包率10%，Rtt 60ms~125ms
vnet = new LatencySimulator(10, 60, 125);
// 创建两个端点的 kcp对象，第一个参数 conv是会话编号，同一个会话需要相同
// 最后一个是 user参数，用来传递标识
var kcp1 = new KCP(0x11223344, 1);
var kcp2 = new KCP(0x11223344, 2);
// 设置kcp的下层输出，这里为 udp_output，模拟udp网络输出函数
kcp1.SetOutput(udp_output);
kcp2.SetOutput(udp_output);
UInt32 current = Utils.iclock();
UInt32 slap = current + 20;
UInt32 index = 0;
UInt32 next = 0;
Int64 sumrtt = 0;
int count = 0;
int maxrtt = 0;
// 配置窗口大小：平均延迟200ms，每20ms发送一个包，
// 而考虑到丢包重发，设置最大收发窗口为128
kcp1.WndSize(128, 128);
kcp2.WndSize(128, 128);
if (mode == 0) // 默认模式
{
kcp1.NoDelay(0, 10, 0, 0);
kcp2.NoDelay(0, 10, 0, 0);
}
else if (mode == 1) // 普通模式，关闭流控等
{
kcp1.NoDelay(0, 10, 0, 1);
kcp2.NoDelay(0, 10, 0, 1);
}
else // 启动快速模式
{
// 第1个参数 nodelay-启用以后若干常规加速将启动
// 第2个参数 interval为内部处理时钟，默认设置为 10ms
// 第3个参数 resend为快速重传指标，设置为2
// 第4个参数 为是否禁用常规流控，这里禁止
kcp1.NoDelay(1, 10, 2, 1);
kcp2.NoDelay(1, 10, 2, 1);
kcp1.SetMinRTO(10);
kcp1.SetFastResend(1);
}
var buffer = new byte[2000];
int hr = 0;
UInt32 ts1 = Utils.iclock();
while (true)
{
Thread.Sleep(1);
current = Utils.iclock();
kcp1.Update(current);
kcp2.Update(current);
// 每隔 20ms，kcp1发送数据
for (; current >= slap; slap += 20)
{
KCP.ikcp_encode32u(buffer, 0, index++);
KCP.ikcp_encode32u(buffer, 4, current);
// 发送上层协议包
kcp1.Send(buffer, 0, 8);
}
// 处理虚拟网络：检测是否有udp包从p1->p2
while (true)
{
hr = vnet.Recv(1, buffer, 2000);
if (hr < 0)
{
break;
}
// 如果 p2收到udp，则作为下层协议输入到kcp2
hr = kcp2.Input(buffer, 0, hr);
Debug.Assert(hr >= 0);
}
// 处理虚拟网络：检测是否有udp包从p2->p1
while (true)
{
hr = vnet.Recv(0, buffer, 2000);
if (hr < 0)
{
break;
}
// 如果 p1收到udp，则作为下层协议输入到kcp1
hr = kcp1.Input(buffer, 0, hr);
Debug.Assert(hr >= 0);
}
// kcp2接收到任何包都返回回去
while (true)
{
hr = kcp2.Recv(buffer, 0, 10);
if (hr < 0)
{
break;
}
// 如果收到包就回射
hr = kcp2.Send(buffer, 0, hr);
Debug.Assert(hr >= 0);
}
// kcp1收到kcp2的回射数据
while (true)
{
hr = kcp1.Recv(buffer, 0, 10);
if (hr < 0) // 没有收到包就退出
{
break;
}
int offset = 0;
UInt32 sn = KCP.ikcp_decode32u(buffer, ref offset);
UInt32 ts = KCP.ikcp_decode32u(buffer, ref offset);
UInt32 rtt = current - ts;
if (sn != next)
{
// 如果收到的包不连续
Console.WriteLine(String.Format("ERROR sn {0}<->{1}", count, next));
return;
}
next++;
sumrtt += rtt;
count++;
if (rtt > maxrtt)
{
maxrtt = (int)rtt;
}
Console.WriteLine(String.Format("[RECV] mode={0} sn={1} rtt={2}", mode, sn, rtt));
}
if (next > 1000)
{
break;
}
}
ts1 = Utils.iclock() - ts1;
var names = new string[3] {
"default", "normal", "fast"
};
Console.WriteLine("{0} mode result ({1}ms):", names[mode], ts1);
Console.WriteLine("avgrtt={0} maxrtt={1} tx={2}", sumrtt / count, maxrtt, vnet.tx1);
Console.WriteLine("Press any key to next...");
Console.Read();
}
// Test case
static void KCPTest(int mode)
{
// Create an analog network: 10% packet loss rate，Rtt 60ms~125ms
vnet = new LatencySimulator(10, 60, 125);
// Create a kcp object with two endpoints, the first parameter conv is the session number, the same session needs to be the same
// The last one is the user parameter, which is used to pass the identifier.
var kcp1 = new KCP(0x11223344, 1);
var kcp2 = new KCP(0x11223344, 2);
// Set the lower output of kcp, here udp_output, simulate udp network output function
kcp1.SetOutput(udp_output);
kcp2.SetOutput(udp_output);
UInt32 current = Utils.iclock();
UInt32 slap = current + 20;
UInt32 index = 0;
UInt32 next = 0;
Int64 sumrtt = 0;
int count = 0;
int maxrtt = 0;
// Configuration window size: average delay 200ms, send a packet every 20ms,
// Considering the packet loss retransmission, set the maximum receiving and sending window to 128.
kcp1.WndSize(128, 128);
kcp2.WndSize(128, 128);
if (mode == 0) //Default mode
{
kcp1.NoDelay(0, 10, 0, 0);
kcp2.NoDelay(0, 10, 0, 0);
}
else if (mode == 1) // Normal mode, turn off flow control, etc.
{
kcp1.NoDelay(0, 10, 0, 1);
kcp2.NoDelay(0, 10, 0, 1);
}
else //Start fast mode
{
// 1st parameter nodelay-enabled after some regular acceleration will start
// The second parameter interval is the internal processing clock. The default setting is 10ms.
// The third parameter resend is the fast retransmission indicator, set to 2
// The fourth parameter is whether to disable regular flow control, this is forbidden here.
kcp1.NoDelay(1, 10, 2, 1);
kcp2.NoDelay(1, 10, 2, 1);
kcp1.SetMinRTO(10);
kcp1.SetFastResend(1);
}
var buffer = new byte[2000];
int hr = 0;
UInt32 ts1 = Utils.iclock();
while (true)
{
Thread.Sleep(1);
current = Utils.iclock();
kcp1.Update(current);
kcp2.Update(current);
// Kcp1 sends data every 20ms
for (; current >= slap; slap += 20)
{
KCP.ikcp_encode32u(buffer, 0, index++);
KCP.ikcp_encode32u(buffer, 4, current);
// Send the upper layer protocol packet
kcp1.Send(buffer, 0, 8);
}
//Handling virtual networks: detecting if there are udp packets from p1->p2
while (true)
{
hr = vnet.Recv(1, buffer, 2000);
if (hr < 0)
{
break;
}
//If p2 receives udp, it is input to kcp2 as the underlying protocol.
hr = kcp2.Input(buffer, 0, hr);
Debug.Assert(hr >= 0);
}
// Handling virtual networks: detecting if there are udp packets from p2->p1
while (true)
{
hr = vnet.Recv(0, buffer, 2000);
if (hr < 0)
{
break;
}
// If p1 receives udp, it is input to kcp1 as the underlying protocol.
hr = kcp1.Input(buffer, 0, hr);
Debug.Assert(hr >= 0);
}
// Kcp2 receives any package and returns it.
while (true)
{
hr = kcp2.Recv(buffer, 0, 10);
if (hr < 0)
{
break;
}
//If you receive the package, it will return
hr = kcp2.Send(buffer, 0, hr);
Debug.Assert(hr >= 0);
}
// Kcp1 receives the echo data of kcp2
while (true)
{
hr = kcp1.Recv(buffer, 0, 10);
if (hr < 0) // Exit without receiving the package
{
break;
}
int offset = 0;
UInt32 sn = KCP.ikcp_decode32u(buffer, ref offset);
UInt32 ts = KCP.ikcp_decode32u(buffer, ref offset);
UInt32 rtt = current - ts;
if (sn != next)
{
// If the received packet is not continuous
Console.WriteLine(String.Format("ERROR sn {0}<->{1}", count, next));
return;
}
next++;
sumrtt += rtt;
count++;
if (rtt > maxrtt)
{
maxrtt = (int)rtt;
}
Console.WriteLine(String.Format("[RECV] mode={0} sn={1} rtt={2}", mode, sn, rtt));
}
if (next > 1000)
{
break;
}
}
ts1 = Utils.iclock() - ts1;
var names = new string[3] {
"default", "normal", "fast"
};
Console.WriteLine("{0} mode result ({1}ms):", names[mode], ts1);
Console.WriteLine("avgrtt={0} maxrtt={1} tx={2}", sumrtt / count, maxrtt, vnet.tx1);
Console.WriteLine("Press any key to next...");
Console.Read();
}