public ActiveStreamsEnumerator(ActiveStreams collection)
{
_collection = collection;
_curPair = default(KeyValuePair <int, Http2Stream>);
_nonControlledEnum = _collection.NonFlowControlledStreams.GetEnumerator();
_controlledEnum = _collection.FlowControlledStreams.GetEnumerator();
}
/// <summary>
/// Gets the stream from active streams.
/// </summary>
/// <param name="id">The stream id.</param>
/// <returns></returns>
internal Http2Stream GetStream(int id)
{
Http2Stream stream;
if (!ActiveStreams.TryGetValue(id, out stream))
{
return(null);
}
return(stream);
}
public Http2Session(SecureSocket sessionSocket, ConnectionEnd end,
bool usePriorities, bool useFlowControl,
IDictionary <string, object> handshakeResult = null)
{
_ourEnd = end;
_usePriorities = usePriorities;
_useFlowControl = useFlowControl;
_handshakeHeaders = new Dictionary <string, string>(16);
ApplyHandshakeResults(handshakeResult);
if (_ourEnd == ConnectionEnd.Client)
{
_remoteEnd = ConnectionEnd.Server;
_lastId = -1; // Streams opened by client are odd
}
else
{
_remoteEnd = ConnectionEnd.Client;
_lastId = 0; // Streams opened by server are even
}
_goAwayReceived = false;
_settingsManager = new SettingsManager();
_comprProc = new CompressionProcessor(_ourEnd);
_sessionSocket = sessionSocket;
_frameReader = new FrameReader(_sessionSocket);
ActiveStreams = new ActiveStreams();
_writeQueue = new WriteQueue(_sessionSocket, ActiveStreams, _usePriorities);
OurMaxConcurrentStreams = 100; //Spec recommends value 100 by default
RemoteMaxConcurrentStreams = 100;
_flowControlManager = new FlowControlManager(this);
if (!_useFlowControl)
{
_flowControlManager.Options = (byte)FlowControlOptions.DontUseFlowControl;
}
SessionWindowSize = 0;
}
/// <summary>
/// Creates new http2 stream.
/// </summary>
/// <param name="priority">The stream priority.</param>
/// <returns></returns>
/// <exception cref="System.InvalidOperationException">Thrown when trying to create more streams than allowed by the remote side</exception>
private Http2Stream CreateStream(Priority priority)
{
if (ActiveStreams.GetOpenedStreamsBy(_ourEnd) + 1 > RemoteMaxConcurrentStreams)
{
Dispose();
throw new InvalidOperationException("Trying to create more streams than allowed by the remote side!");
}
var id = GetNextId();
if (_usePriorities)
{
ActiveStreams[id] = new Http2Stream(id, _writeQueue, _flowControlManager, _comprProc, priority);
}
else
{
ActiveStreams[id] = new Http2Stream(id, _writeQueue, _flowControlManager, _comprProc);
}
ActiveStreams[id].OnClose += (o, args) =>
{
if (!ActiveStreams.Remove(ActiveStreams[args.Id]))
{
throw new ArgumentException("Can't remove stream from ActiveStreams.");
}
};
ActiveStreams[id].OnFrameSent += (o, args) =>
{
if (OnFrameSent != null)
{
OnFrameSent(o, args);
}
};
return(ActiveStreams[id]);
}
/// <summary>
/// Dispatches the incoming frame.
/// </summary>
/// <param name="frame">The frame.</param>
/// <exception cref="System.NotImplementedException"></exception>
private void DispatchIncomingFrame(Frame frame)
{
Http2Stream stream = null;
//Spec 03 tells that frame with continues flag MUST be followed by a frame with the same type
//and the same stread id.
if (_toBeContinuedHeaders != null)
{
if (_toBeContinuedFrame.FrameType != frame.FrameType ||
_toBeContinuedFrame.StreamId != frame.StreamId)
{
//If not, we must close the session.
Dispose();
return;
}
}
try
{
switch (frame.FrameType)
{
case FrameType.Headers:
Http2Logger.LogDebug("New headers with id = " + frame.StreamId);
var headersFrame = (HeadersFrame)frame;
var serializedHeaders = new byte[headersFrame.CompressedHeaders.Count];
Buffer.BlockCopy(headersFrame.CompressedHeaders.Array,
headersFrame.CompressedHeaders.Offset,
serializedHeaders, 0, serializedHeaders.Length);
var decompressedHeaders = _comprProc.Decompress(serializedHeaders);
var headers = new HeadersList(decompressedHeaders);
if (!headersFrame.IsEndHeaders)
{
_toBeContinuedHeaders = decompressedHeaders;
_toBeContinuedFrame = headersFrame;
break;
}
if (_toBeContinuedHeaders != null)
{
headers.AddRange(_toBeContinuedHeaders);
}
headersFrame.Headers.AddRange(headers);
foreach (var header in headers)
{
Http2Logger.LogDebug("Stream {0} header: {1}={2}", frame.StreamId, header.Key, header.Value);
}
stream = GetStream(headersFrame.StreamId);
if (stream == null)
{
// new stream
if (ActiveStreams.GetOpenedStreamsBy(_remoteEnd) + 1 > OurMaxConcurrentStreams)
{
//Remote side tries to open more streams than allowed
Dispose();
return;
}
string path = headers.GetValue(":path");
if (path == null)
{
path = _handshakeHeaders.ContainsKey(":path") ? _handshakeHeaders[":path"] : @"\index.html";
headers.Add(new KeyValuePair <string, string>(":path", path));
}
stream = new Http2Stream(headers, headersFrame.StreamId,
_writeQueue, _flowControlManager,
_comprProc);
ActiveStreams[stream.Id] = stream;
stream.OnClose += (o, args) =>
{
if (!ActiveStreams.Remove(ActiveStreams[args.Id]))
{
throw new ArgumentException("Cant remove stream from ActiveStreams");
}
};
_toBeContinuedFrame = null;
_toBeContinuedHeaders = null;
}
break;
case FrameType.Priority:
var priorityFrame = (PriorityFrame)frame;
Http2Logger.LogDebug("Priority frame. StreamId: {0} Priority: {1}", priorityFrame.StreamId, priorityFrame.Priority);
stream = GetStream(priorityFrame.StreamId);
if (_usePriorities)
{
stream.Priority = priorityFrame.Priority;
}
break;
case FrameType.RstStream:
var resetFrame = (RstStreamFrame)frame;
stream = GetStream(resetFrame.StreamId);
if (stream != null)
{
Http2Logger.LogDebug("RST frame with code " + resetFrame.StatusCode);
stream.Dispose();
}
break;
case FrameType.Data:
var dataFrame = (DataFrame)frame;
Http2Logger.LogDebug("Data frame. StreamId:{0} Length:{1}", dataFrame.StreamId, dataFrame.FrameLength);
stream = GetStream(dataFrame.StreamId);
//Aggressive window update
if (stream.IsFlowControlEnabled)
{
stream.WriteWindowUpdate(2000000);
}
break;
case FrameType.Ping:
var pingFrame = (PingFrame)frame;
Http2Logger.LogDebug("Ping frame with StreamId:{0} Payload:{1}", pingFrame.StreamId, pingFrame.Payload.Count);
if (pingFrame.FrameLength != PingFrame.PayloadLength)
{
throw new ProtocolError(ResetStatusCode.ProtocolError, "Ping payload size is not equal to 8");
}
if (pingFrame.IsPong)
{
_wasPingReceived = true;
_pingReceived.Set();
}
else
{
var pongFrame = new PingFrame(true, pingFrame.Payload.ToArray());
_writeQueue.WriteFrame(pongFrame);
}
break;
case FrameType.Settings:
//Not first frame in the session.
//Client initiates connection and sends settings before request.
//It means that if server sent settings before it will not be a first frame,
//because client initiates connection.
if (_ourEnd == ConnectionEnd.Server && !_wasSettingsReceived && ActiveStreams.Count != 0)
{
Dispose();
return;
}
var settingFrame = (SettingsFrame)frame;
Http2Logger.LogDebug("Settings frame. Entry count: {0} StreamId: {1}", settingFrame.EntryCount, settingFrame.StreamId);
_wasSettingsReceived = true;
_settingsManager.ProcessSettings(settingFrame, this, _flowControlManager);
break;
case FrameType.WindowUpdate:
if (_useFlowControl)
{
var windowFrame = (WindowUpdateFrame)frame;
Http2Logger.LogDebug("WindowUpdate frame. Delta: {0} StreamId: {1}", windowFrame.Delta, windowFrame.StreamId);
stream = GetStream(windowFrame.StreamId);
if (stream != null)
{
stream.UpdateWindowSize(windowFrame.Delta);
stream.PumpUnshippedFrames();
}
}
break;
case FrameType.GoAway:
_goAwayReceived = true;
Http2Logger.LogDebug("GoAway frame received");
Dispose();
break;
default:
throw new NotImplementedException(frame.FrameType.ToString());
}
if (stream != null && frame is IEndStreamFrame && ((IEndStreamFrame)frame).IsEndStream)
{
//Tell the stream that it was the last frame
Http2Logger.LogDebug("Final frame received for stream with id = " + stream.Id);
stream.EndStreamReceived = true;
}
if (stream != null && OnFrameReceived != null)
{
OnFrameReceived(this, new FrameReceivedEventArgs(stream, frame));
}
}
//Frame came for already closed stream. Ignore it.
//Spec:
//An endpoint that sends RST_STREAM MUST ignore
//frames that it receives on closed streams if it sends RST_STREAM.
//
//An endpoint MUST NOT send frames on a closed stream. An endpoint
//that receives a frame after receiving a RST_STREAM or a frame
//containing a END_STREAM flag on that stream MUST treat that as a
//stream error (Section 5.4.2) of type PROTOCOL_ERROR.
catch (Http2StreamNotFoundException)
{
if (stream != null)
{
stream.WriteRst(ResetStatusCode.ProtocolError);
}
else
{
//GoAway?
}
}
catch (CompressionError ex)
{
//The endpoint is unable to maintain the compression context for the connection.
Http2Logger.LogError("Compression error occured: " + ex.Message);
Close(ResetStatusCode.CompressionError);
}
catch (ProtocolError pEx)
{
Http2Logger.LogError("Protocol error occured: " + pEx.Message);
Close(pEx.Code);
}
}
