public async Task <bool> Disconnect(TimeSpan timeout)
{
var connectionStream = await StreamManager.Get(0).ConfigureAwait(false);
var semaphoreWait = new SemaphoreSlim(0);
var cancelTokenSource = new CancellationTokenSource();
var sentGoAway = false;
var sentDelegate = new Http2Stream.FrameSentDelegate(frame => {
if (frame.Type == FrameType.GoAway)
{
sentGoAway = true;
semaphoreWait.Release();
}
});
connectionStream.OnFrameSent += sentDelegate;
await connection.QueueFrame(new GoAwayFrame()).ConfigureAwait(false);
if (timeout != Timeout.InfiniteTimeSpan)
{
cancelTokenSource.CancelAfter(timeout);
}
await semaphoreWait.WaitAsync(cancelTokenSource.Token).ConfigureAwait(false);
connectionStream.OnFrameSent -= sentDelegate;
connection.Disconnect();
return(sentGoAway);
}
public async Task <bool> Ping(byte[] opaqueData, CancellationToken cancelToken)
{
if (opaqueData == null || opaqueData.Length <= 0)
{
throw new ArgumentNullException(nameof(opaqueData));
}
await connection.Connect().ConfigureAwait(false);
var semaphoreWait = new SemaphoreSlim(0);
var opaqueDataMatch = false;
var connectionStream = await StreamManager.Get(0).ConfigureAwait(false);
Http2Stream.FrameReceivedDelegate frameRxAction;
frameRxAction = new Http2Stream.FrameReceivedDelegate(frame => {
if (frame is PingFrame pf)
{
opaqueDataMatch = pf.Ack && pf.OpaqueData != null && pf.OpaqueData.SequenceEqual(opaqueData);
semaphoreWait.Release();
}
});
// Wire up the event to listen for ping response
connectionStream.OnFrameReceived += frameRxAction;
// Construct ping request
var pingFrame = new PingFrame {
OpaqueData = new byte[opaqueData.Length]
};
opaqueData.CopyTo(pingFrame.OpaqueData, 0);
// Send ping
await connection.QueueFrame(pingFrame).ConfigureAwait(false);
// Wait for either a ping response or timeout
await semaphoreWait.WaitAsync(cancelToken).ConfigureAwait(false);
// Cleanup the event
connectionStream.OnFrameReceived -= frameRxAction;
return(opaqueDataMatch);
}
public async Task <Http2Response> Send(CancellationToken cancelToken, Uri uri, HttpMethod method, NameValueCollection headers = null, Stream data = null)
{
var semaphoreClose = new SemaphoreSlim(0);
await connection.Connect().ConfigureAwait(false);
var stream = await StreamManager.Get().ConfigureAwait(false);
stream.OnFrameReceived += async(frame) =>
{
// Check for an end of stream state
if (stream.State == StreamState.HalfClosedRemote || stream.State == StreamState.Closed)
{
semaphoreClose.Release();
}
};
var sentEndOfStream = false;
var allHeaders = new NameValueCollection();
allHeaders.Add(":method", method.Method.ToUpperInvariant());
allHeaders.Add(":path", uri.PathAndQuery);
allHeaders.Add(":scheme", uri.Scheme);
allHeaders.Add(":authority", uri.Authority);
if (headers != null && headers.Count > 0)
{
allHeaders.Add(headers);
}
var headerData = Util.PackHeaders(allHeaders, connection.Settings.HeaderTableSize);
var numFrames = (int)Math.Ceiling((double)headerData.Length / (double)connection.Settings.MaxFrameSize);
for (var i = 0; i < numFrames; i++)
{
// First item is headers frame, others are continuation
var frame = (i == 0) ?
(IFrameContainsHeaders) new HeadersFrame(stream.StreamIdentifer)
: (IFrameContainsHeaders) new ContinuationFrame(stream.StreamIdentifer);
// Set end flag if this is the last item
if (i == numFrames - 1)
{
frame.EndHeaders = true;
}
var maxFrameSize = connection.Settings.MaxFrameSize;
var amt = maxFrameSize;
if (i * maxFrameSize + amt > headerData.Length)
{
amt = (uint)headerData.Length - (uint)(i * maxFrameSize);
}
frame.HeaderBlockFragment = new byte[amt];
Array.Copy(headerData, i * maxFrameSize, frame.HeaderBlockFragment, 0, amt);
// If we won't s end
if (data == null && frame is HeadersFrame)
{
sentEndOfStream = true;
(frame as HeadersFrame).EndStream = true;
}
await connection.QueueFrame(frame).ConfigureAwait(false);
}
if (data != null)
{
var supportsPosLength = true; // Keep track of if we threw exceptions trying pos/len of stream
// Break stream up into data frames within allowed size
var dataFrameBuffer = new byte[connection.Settings.MaxFrameSize];
while (true)
{
var rd = await data.ReadAsync(dataFrameBuffer, 0, dataFrameBuffer.Length).ConfigureAwait(false);
if (rd <= 0)
{
break;
}
// Make a new data frame with a buffer the size we read
var dataFrame = new DataFrame(stream.StreamIdentifer)
{
Data = new byte[rd]
};
// Copy over the data we read
Array.Copy(dataFrameBuffer, 0, dataFrame.Data, 0, rd);
try {
// See if the stream supports Length / Position to try and detect EOS
// we also want to see if we previously had an exception trying this
// and not try again if we did, since throwing exceptions every single
// read operation is wasteful
if (supportsPosLength && data.Position >= data.Length)
{
dataFrame.EndStream = true;
sentEndOfStream = true;
}
} catch {
supportsPosLength = false;
sentEndOfStream = false;
}
await connection.QueueFrame(dataFrame).ConfigureAwait(false);
}
}
// Send an empty frame with end of stream flag
if (!sentEndOfStream)
{
await connection.QueueFrame(new DataFrame(stream.StreamIdentifer) { EndStream = true }).ConfigureAwait(false);
}
if (!await semaphoreClose.WaitAsync(ConnectionSettings.ConnectionTimeout, cancelToken).ConfigureAwait(false))
{
throw new TimeoutException();
}
var responseData = new List <byte> ();
var rxHeaderData = new List <byte> ();
foreach (var f in stream.ReceivedFrames)
{
if (f.Type == FrameType.Headers || f.Type == FrameType.Continuation)
{
// Get the header data and add it to our buffer
var fch = (IFrameContainsHeaders)f;
if (fch.HeaderBlockFragment != null && fch.HeaderBlockFragment.Length > 0)
{
rxHeaderData.AddRange(fch.HeaderBlockFragment);
}
}
else if (f.Type == FrameType.PushPromise)
{
// TODO: In the future we need to implement PushPromise beyond grabbing header data
var fch = (IFrameContainsHeaders)f;
if (fch.HeaderBlockFragment != null && fch.HeaderBlockFragment.Length > 0)
{
rxHeaderData.AddRange(fch.HeaderBlockFragment);
}
}
else if (f.Type == FrameType.Data)
{
responseData.AddRange((f as DataFrame).Data);
}
else if (f.Type == FrameType.GoAway)
{
if (f is GoAwayFrame fga && fga.AdditionalDebugData != null && fga.AdditionalDebugData.Length > 0)
{
responseData.AddRange(fga.AdditionalDebugData);
}
}
}
var responseHeaders = Util.UnpackHeaders(rxHeaderData.ToArray(),
connection.Settings.MaxHeaderListSize.HasValue ? (int)connection.Settings.MaxHeaderListSize.Value : 8192,
(int)connection.Settings.HeaderTableSize);
var strStatus = "500";
if (responseHeaders [":status"] != null)
{
strStatus = responseHeaders [":status"];
}
var statusCode = HttpStatusCode.OK;
Enum.TryParse <HttpStatusCode> (strStatus, out statusCode);
// Remove the stream from being tracked since we're done with it
await StreamManager.Cleanup(stream.StreamIdentifer).ConfigureAwait(false);
// Send a WINDOW_UPDATE frame to release our stream's data count
// TODO: Eventually need to do this on the stream itself too (if it's open)
await connection.FreeUpWindowSpace().ConfigureAwait(false);
return(new Http2Response {
Status = statusCode,
Stream = stream,
Headers = responseHeaders,
Body = responseData.ToArray()
});
}
