/// <summary>
/// 当接收到远程端的数据时，将触发此方法
/// </summary>
/// <param name="stream">接收到的历史数据</param>
protected sealed override void OnReceive(INsStream stream)
{
while (true)
{
var packet = default(FastPacket);
if (FastPacket.Parse(stream, out packet) == false)
{
stream.Clear();
}
if (packet == null)
{
break;
}
// 新线程处理业务内容
Task.Factory.StartNew(() => this.OnReceivePacket(packet));
}
}
/// <summary>
/// 解析一个数据包
/// 不足一个封包时返回null
/// </summary>
/// <param name="stream">接收到的历史数据</param>
/// <param name="packet">数据包</param>
/// <returns></returns>
public static bool Parse(INsStream stream, out FastPacket packet)
{
if (stream.Length < 1 || stream[0] != FastPacket.Mark)
{
packet = null;
return(false);
}
if (stream.Length < 5)
{
packet = null;
return(true);
}
stream.Position = 1;
const int packetMinSize = 16;
var totalBytes = stream.ReadInt32();
if (totalBytes < packetMinSize)
{
packet = null;
return(false);
}
// 数据包未接收完整
if (stream.Length < totalBytes)
{
packet = null;
return(true);
}
// api名称数据长度
var apiNameLength = stream.ReadByte();
if (totalBytes < apiNameLength + packetMinSize)
{
packet = null;
return(false);
}
// api名称数据
var apiNameBytes = stream.ReadArray(apiNameLength);
// 标识符
var id = stream.ReadInt64();
// 是否为客户端封包
var isFromClient = stream.ReadBoolean();
// 是否异常
var isException = stream.ReadBoolean();
// 实体数据
var body = stream.ReadArray(totalBytes - stream.Position);
// 清空本条数据
stream.Clear(totalBytes);
var apiName = Encoding.UTF8.GetString(apiNameBytes);
packet = new FastPacket(apiName, id, isFromClient)
{
TotalBytes = totalBytes,
ApiNameLength = apiNameLength,
IsException = isException,
Body = body
};
return(true);
}
/// <summary>
/// 解析请求的数据
/// 返回请求数据包
/// </summary>
/// <param name="stream">所有收到的数据</param>
/// <exception cref="NotSupportedException"></exception>
/// <returns></returns>
public unsafe static FrameRequest Parse(INsStream stream)
{
if (stream.Length < 2)
{
return(null);
}
ByteBits byte0 = stream[0];
var fin = byte0[0];
var frameCode = (FrameCodes)(byte)byte0.Take(4, 4);
if (fin == false || frameCode == FrameCodes.Continuation)
{
return(null);
}
var rsv = byte0.Take(1, 3);
ByteBits byte1 = stream[1];
var mask = byte1[0];
if (mask == false || Enum.IsDefined(typeof(FrameCodes), frameCode) == false || rsv != 0)
{
throw new NotSupportedException();
}
var contentSize = 0;
var contentLength = (int)byte1.Take(1, 7);
stream.Position = 2;
if (contentLength == 127)
{
contentSize = 8;
contentLength = (int)stream.ReadUInt64();
}
else if (contentLength == 126)
{
contentSize = 2;
contentLength = (int)stream.ReadUInt16();
}
var packetLength = 6 + contentSize + contentLength;
if (stream.Length < packetLength)
{
return(null);
}
var maskingKey = stream.ReadArray(4);
var content = stream.ReadArray(contentLength);
stream.Clear(packetLength);
if (contentLength > 0)
{
fixed(byte *pcontent = &content[0], pmask = &maskingKey[0])
{
for (var i = 0; i < contentLength; i++)
{
*(pcontent + i) = (byte)(*(pcontent + i) ^ *(pmask + i % 4));
}
}
}
return(new FrameRequest
{
Fin = fin,
Rsv = rsv,
Mask = mask,
Frame = frameCode,
ContentLength = contentLength,
MaskingKey = maskingKey,
Content = content
});
}