/// <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(IStreamReader 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);
}
private void ReadData(int dataTypeCd, WireMessage message, IStreamReader reader)
{
switch ((TypeCode)dataTypeCd)
{
case TypeCode.Boolean:
message.Data = reader.ReadBoolean();
break;
case TypeCode.Byte:
message.Data = reader.ReadByte();
break;
case TypeCode.Char:
message.Data = reader.ReadChar();
break;
case TypeCode.DateTime:
message.Data = new DateTime(reader.ReadInt64());
break;
case TypeCode.DBNull:
reader.ReadByte();
message.Data = DBNull.Value;
break;
case TypeCode.Decimal:
message.Data = reader.ReadDecimal();
break;
case TypeCode.Double:
message.Data = reader.ReadDouble();
break;
case TypeCode.Empty:
reader.ReadByte();
break;
case TypeCode.Int16:
message.Data = reader.ReadInt16();
break;
case TypeCode.Int32:
message.Data = reader.ReadInt32();
break;
case TypeCode.Int64:
message.Data = reader.ReadInt64();
break;
case TypeCode.SByte:
message.Data = reader.ReadSByte();
break;
case TypeCode.Single:
message.Data = reader.ReadSingle();
break;
case TypeCode.String:
message.Data = ReadString(reader);
break;
case TypeCode.UInt16:
message.Data = reader.ReadUInt16();
break;
case TypeCode.UInt32:
message.Data = reader.ReadUInt32();
break;
case TypeCode.UInt64:
message.Data = reader.ReadUInt64();
break;
default:
{
var len = reader.ReadInt32();
if (len > 0)
{
using (var tempStream = new ChunkedStream())
{
var chunkSize = tempStream.ChunkSize;
while (len > 0)
{
var bytes = reader.ReadBytes(chunkSize);
var readLen = bytes?.Length ?? 0;
if (readLen == 0)
{
throw new Exception(SerializationErrors.StreamNotContainingValidWireMessage);
}
len -= readLen;
tempStream.Write(bytes, 0, readLen);
}
tempStream.Position = 0;
message.Data = GetSerializer().Deserialize(tempStream);
}
}
}
break;
}
}
