/// <summary>
/// Initializes a new instance of the <see cref="CqlDataReader" /> class.
/// </summary>
/// <param name="frame"> The frame. </param>
internal CqlDataReader(ResultFrame frame)
{
_frame = frame;
}
/// <summary>
/// Reads a packet from a stream.
/// </summary>
/// <param name="stream"> The stream. </param>
/// <returns> </returns>
internal static async Task <Frame> FromStream(Stream stream)
{
//read header
int read = 0;
var header = new byte[8];
while (read < 8)
{
read += await stream.ReadAsync(header, read, 8 - read).ConfigureAwait(false);
}
//get length
if (BitConverter.IsLittleEndian)
{
Array.Reverse(header, 4, 4);
}
int length = BitConverter.ToInt32(header, 4);
Frame frame;
switch ((FrameOpcode)header[3])
{
case FrameOpcode.Error:
frame = new ErrorFrame();
break;
case FrameOpcode.Ready:
frame = new ReadyFrame();
break;
case FrameOpcode.Authenticate:
frame = new AuthenticateFrame();
break;
case FrameOpcode.Supported:
frame = new SupportedFrame();
break;
case FrameOpcode.Result:
frame = new ResultFrame();
break;
case FrameOpcode.Event:
frame = new EventFrame();
break;
default:
throw new ProtocolException(0, "Unexpected OpCode received.");
}
frame.Version = (FrameVersion)header[0];
frame.Flags = (FrameFlags)header[1];
frame.Stream = unchecked ((sbyte)header[2]);
frame.OpCode = (FrameOpcode)header[3];
frame.Length = length;
//wrap the stream in a window, that will be completely read when disposed
var reader = new FrameReader(stream, length);
frame.Reader = reader;
//decompress the contents of the frame (implicity loads the entire frame body!)
if (frame.Flags.HasFlag(FrameFlags.Compression))
{
await reader.DecompressAsync();
}
//read tracing id if set
if (frame.Flags.HasFlag(FrameFlags.Tracing))
{
frame.TracingId = await reader.ReadUuidAsync().ConfigureAwait(false);
}
await frame.InitializeAsync().ConfigureAwait(false);
return(frame);
}
/// <summary>
/// Reads a packet from a stream.
/// </summary>
/// <param name="stream"> The stream. </param>
/// <returns> </returns>
internal static async Task<Frame> FromStream(Stream stream)
{
//read header
int read = 0;
var header = new byte[8];
while (read < 8)
read += await stream.ReadAsync(header, read, 8 - read).ConfigureAwait(false);
//get length
if (BitConverter.IsLittleEndian) Array.Reverse(header, 4, 4);
int length = BitConverter.ToInt32(header, 4);
Frame frame;
switch ((FrameOpcode)header[3])
{
case FrameOpcode.Error:
frame = new ErrorFrame();
break;
case FrameOpcode.Ready:
frame = new ReadyFrame();
break;
case FrameOpcode.Authenticate:
frame = new AuthenticateFrame();
break;
case FrameOpcode.Supported:
frame = new SupportedFrame();
break;
case FrameOpcode.Result:
frame = new ResultFrame();
break;
case FrameOpcode.Event:
frame = new EventFrame();
break;
default:
throw new ProtocolException(0, "Unexpected OpCode received.");
}
frame.Version = (FrameVersion)header[0];
frame.Flags = (FrameFlags)header[1];
frame.Stream = unchecked((sbyte)header[2]);
frame.OpCode = (FrameOpcode)header[3];
frame.Length = length;
//wrap the stream in a window, that will be completely read when disposed
var reader = new FrameReader(stream, length);
frame.Reader = reader;
//decompress the contents of the frame (implicity loads the entire frame body!)
if (frame.Flags.HasFlag(FrameFlags.Compression))
await reader.DecompressAsync();
//read tracing id if set
if (frame.Flags.HasFlag(FrameFlags.Tracing))
frame.TracingId = await reader.ReadUuidAsync().ConfigureAwait(false);
await frame.InitializeAsync().ConfigureAwait(false);
return frame;
}
/// <summary>
/// Gets the frame from opcode.
/// </summary>
/// <param name="protocolVersion">the version of the cql binary protocol in use</param>
/// <param name="opcode">The opcode.</param>
/// <returns></returns>
/// <exception cref="ProtocolException">Unexpected OpCode received.</exception>
private static Frame GetFrameFromOpcode(byte protocolVersion, FrameOpcode opcode)
{
Frame frame;
switch(opcode)
{
case FrameOpcode.Error:
frame = new ErrorFrame();
break;
case FrameOpcode.Ready:
frame = new ReadyFrame();
break;
case FrameOpcode.Authenticate:
frame = new AuthenticateFrame();
break;
case FrameOpcode.AuthChallenge:
frame = new AuthChallengeFrame();
break;
case FrameOpcode.AuthSuccess:
frame = new AuthSuccessFrame();
break;
case FrameOpcode.Supported:
frame = new SupportedFrame();
break;
case FrameOpcode.Result:
frame = new ResultFrame();
break;
case FrameOpcode.Event:
frame = new EventFrame();
break;
default:
throw new ProtocolException(protocolVersion, 0, string.Format("Unexpected OpCode {0:X} received.", opcode));
}
return frame;
}