private async Task ParseCmd(ReadOnlyMemory <byte> recvBufMemory, int length)
{
byte cmd = recvBufMemory.Span[0];
if ((cmd & NetworkCmd.SYN) != 0)
{
if ((cmd & NetworkCmd.ACK) != 0)
{
// Debug.LogFormat("recv SYN +ACK");
// syn ack
uint conv = BinaryPrimitives.ReadUInt32LittleEndian(recvBufMemory.Span.Slice(1));
if (_kcpLink == null)
{
_kcpLink = new KcpLink();
_kcpLink.Run(conv, new KcpUdpCallback(_socket, _remoteEP));
_kcpLink.OnRecvKcpPackage += KcpLink_OnRecvKcpPackage;
}
// 发送 ayn ack
var sendBytes = new byte[5];
sendBytes[0] = NetworkCmd.SYN | NetworkCmd.ACK;
BinaryPrimitives.WriteUInt32LittleEndian(new Span <byte>(sendBytes, 1, 4), conv);
// Debug.LogFormat("send SYN + ACK");
_socket.Send(sendBytes, SocketFlags.None);
_synTaskCancellationTokenSource.Cancel();
}
else
{
// syn 客户端不存在这种情况
}
}
else if ((cmd & NetworkCmd.PUSH) != 0)
{
// Debug.LogFormat("recv PUSH");
await _kcpLink.RecvFromRemoteAsync(recvBufMemory.Slice(1, length - 1));
}
else if ((cmd & NetworkCmd.FIN) != 0)
{
// Debug.LogFormat("recv FIN");
_kcpLink.Stop();
}
}
private async Task ParseCmd(NetworkPackage package)
{
ReadOnlyMemory <byte> buffer = package.MemoryOwner.Memory.Slice(0, package.Lenght);
byte cmd = buffer.Span[0];
if ((cmd & NetworkCmd.SYN) != 0)
{
if ((cmd & NetworkCmd.ACK) == 0)
{
// Debug.LogFormat("recv SYN", package.Remote);
// 连接请求 syn
// TODO 验证IdToken，返回 对应的 conv
uint conv = 1;
if (package.Remote is IPEndPoint ip)
{
// 先用对方的Port作为连接号吧
conv = (uint)ip.Port;
}
var remote = package.Remote;
if (!_synAckTaskTokens.ContainsKey(remote))
{
var cancellationTokenSource = new CancellationTokenSource();
if (_synAckTaskTokens.TryAdd(remote, cancellationTokenSource))
{
var synAck = new Task(async() => {
var sendBytes = new byte[5];
sendBytes[0] = NetworkCmd.SYN | NetworkCmd.ACK;
BinaryPrimitives.WriteUInt32LittleEndian(new Span <byte>(sendBytes, 1, 4), conv);
int delay = InitalTimeOut;
do
{
// 发送conv
// Debug.LogFormat("send SYN + ACK", package.Remote);
_socket.SendTo(sendBytes, SocketFlags.None, remote);
try {
await Task.Delay(delay, cancellationTokenSource.Token);
}
catch (TaskCanceledException) {
break;
}
delay = (int)(delay * Rate);
} while (!cancellationTokenSource.IsCancellationRequested);
_synAckTaskTokens.TryRemove(remote, out var token);
});
synAck.Start();
}
}
}
else
{
// Debug.LogFormat("recv SYN + ACK", package.Remote);
var conv = BinaryPrimitives.ReadUInt32LittleEndian(buffer.Span.Slice(1));
var remote = package.Remote;
// 连接确认 syn ack
if (_synAckTaskTokens.TryRemove(package.Remote, out var token))
{
// 移除旧连接
if (_networkLinks.TryRemove(package.Remote, out var link))
{
link.Stop();
}
// 建立连接
link = new KcpLink();
link.OnRecvKcpPackage += Link_OnRecvKcpPackage;
var kcpOutPut = new KcpUdpCallback(_socket, package.Remote, _networkLinks);
link.Run(conv, kcpOutPut);
_networkLinks.TryAdd(package.Remote, link);
token.Cancel();
}
else
{
if (_networkLinks.TryGetValue(package.Remote, out var link))
{
if (link.Conv != conv)
{
// 连接号已被重置，需要重新请求连接
var sendBytes = new byte[1];
sendBytes[0] = NetworkCmd.RESET;
// Debug.LogFormat("send RESET", package.Remote);
_socket.SendTo(sendBytes, SocketFlags.None, remote);
}
}
else
{
// 连接已不存在，需要重新请求连接
var sendBytes = new byte[1];
sendBytes[0] = NetworkCmd.RESET;
// Debug.LogFormat("send RESET", package.Remote);
_socket.SendTo(sendBytes, SocketFlags.None, remote);
}
}
}
package.MemoryOwner.Dispose();
}
else if ((cmd & NetworkCmd.PUSH) != 0)
{
// Debug.LogFormat("recv PUSH");
// 数据
if (_networkLinks.TryGetValue(package.Remote, out var link))
{
await link.RecvFromRemoteAsync(package.MemoryOwner, 1, package.Lenght - 1);
}
else
{
package.MemoryOwner.Dispose();
}
}
else if ((cmd & NetworkCmd.FIN) != 0)
{
// Debug.LogFormat("recv FIN");
// 断开连接
if (_networkLinks.TryRemove(package.Remote, out var link))
{
link.Stop();
}
package.MemoryOwner.Dispose();
}
else
{
package.MemoryOwner.Dispose();
}
}