public async Task Connect()
{
if (IsConnected())
{
return;
}
tcp = new TcpClient
{
// Disable Nagle for HTTP/2
NoDelay = true
};
await tcp.ConnectAsync(ConnectionSettings.Host, (int)ConnectionSettings.Port).ConfigureAwait(false);
if (ConnectionSettings.UseTls)
{
sslStream = new SslStream(tcp.GetStream(), false,
(sender, certificate, chain, sslPolicyErrors) => true);
#if NETCOREAPP2_1
// .NET Core 2.1 introduces SslClientAuthenticationOptions
// which allows us to set the SslApplicationProtocol (ALPN) which
// for HTTP/2 is required, and should be set to h2 for direct to TLS connections
// (h2c should be set for upgraded connections)
var authOptions = new SslClientAuthenticationOptions
{
ApplicationProtocols = new List <SslApplicationProtocol> {
SslApplicationProtocol.Http2
}, // ALPN h2
EnabledSslProtocols = System.Security.Authentication.SslProtocols.Tls12,
TargetHost = ConnectionSettings.Host,
ClientCertificates = ConnectionSettings.Certificates ?? new X509CertificateCollection()
};
await sslStream.AuthenticateAsClientAsync(
authOptions,
new CancellationToken(false))
.ConfigureAwait(false);
#else
// Fall back to no ALPN support for frameworks which don't support it
await sslStream.AuthenticateAsClientAsync(
ConnectionSettings.Host,
ConnectionSettings.Certificates ?? new X509CertificateCollection(),
System.Security.Authentication.SslProtocols.Tls12,
false).ConfigureAwait(false);
#endif
clientStream = sslStream;
}
else
{
clientStream = tcp.GetStream();
}
// Ensure we have a size for the stream '0'
flowControlManager.GetWindowSize(0);
// Send out preface data
var prefaceData = System.Text.Encoding.ASCII.GetBytes(ConnectionPreface);
await clientStream.WriteAsync(prefaceData, 0, prefaceData.Length).ConfigureAwait(false);
await clientStream.FlushAsync().ConfigureAwait(false);
// Start reading the stream on another thread
var readTask = Task.Factory.StartNew(() => {
try { Read(); }
catch (Exception ex) {
Log.Debug("Read error: " + ex);
Disconnect();
}
}, TaskCreationOptions.LongRunning);
readTask.ContinueWith(t => {
// TODO: Handle the error
Disconnect();
}, TaskContinuationOptions.OnlyOnFaulted).Forget();
// Start a thread to handle writing queued frames to the stream
var writeTask = Task.Factory.StartNew(Write, TaskCreationOptions.LongRunning);
writeTask.ContinueWith(t => {
// TODO: Handle the error
Disconnect();
}, TaskContinuationOptions.OnlyOnFaulted).Forget();
// Send initial blank settings frame
var s = new SettingsFrame();
if (ConnectionSettings.DisablePushPromise)
{
s.EnablePush = false;
}
await QueueFrame(s).ConfigureAwait(false);
}
public async Task Connect()
{
if (IsConnected())
{
return;
}
tcp = new TcpClient
{
// Disable Nagle for HTTP/2
NoDelay = true
};
await tcp.ConnectAsync(ConnectionSettings.Host, (int)ConnectionSettings.Port).ConfigureAwait(false);
if (ConnectionSettings.UseTls)
{
sslStream = new SslStream(tcp.GetStream(), false,
(sender, certificate, chain, sslPolicyErrors) => true);
await sslStream.AuthenticateAsClientAsync(
ConnectionSettings.Host,
ConnectionSettings.Certificates ?? new X509CertificateCollection(),
System.Security.Authentication.SslProtocols.Tls12,
false).ConfigureAwait(false);
clientStream = sslStream;
}
else
{
clientStream = tcp.GetStream();
}
// Ensure we have a size for the stream '0'
flowControlManager.GetWindowSize(0);
// Send out preface data
var prefaceData = System.Text.Encoding.ASCII.GetBytes(ConnectionPreface);
await clientStream.WriteAsync(prefaceData, 0, prefaceData.Length).ConfigureAwait(false);
await clientStream.FlushAsync().ConfigureAwait(false);
// Start reading the stream on another thread
var readTask = Task.Factory.StartNew(() =>
{
try { Read(); }
catch (Exception ex)
{
Log.Debug("Read error: " + ex);
Disconnect();
}
}, TaskCreationOptions.LongRunning);
readTask.ContinueWith(t =>
{
// TODO: Handle the error
Disconnect();
}, TaskContinuationOptions.OnlyOnFaulted).Forget();
// Start a thread to handle writing queued frames to the stream
var writeTask = Task.Factory.StartNew(Write, TaskCreationOptions.LongRunning);
writeTask.ContinueWith(t =>
{
// TODO: Handle the error
Disconnect();
}, TaskContinuationOptions.OnlyOnFaulted).Forget();
// Send initial blank settings frame
var s = new SettingsFrame();
if (ConnectionSettings.DisablePushPromise)
{
s.EnablePush = false;
}
await QueueFrame(s).ConfigureAwait(false);
}
public void Connect()
{
if (IsConnected())
{
return;
}
tcp = new TcpClient();
// Disable Nagle for HTTP/2
tcp.NoDelay = true;
tcp.Connect(ConnectionSettings.Host, (int)ConnectionSettings.Port);
if (ConnectionSettings.UseTls)
{
sslStream = new SslStream(tcp.GetStream(), false,
(sender, certificate, chain, sslPolicyErrors) => true);
sslStream.AuthenticateAsClient(
ConnectionSettings.Host,
ConnectionSettings.Certificates ?? new X509CertificateCollection(),
System.Security.Authentication.SslProtocols.Tls,
false);
clientStream = sslStream;
}
else
{
clientStream = tcp.GetStream();
}
// Ensure we have a size for the stream '0'
flowControlManager.GetWindowSize(0);
// Send out preface data
var prefaceData = System.Text.Encoding.ASCII.GetBytes(ConnectionPreface);
clientStream.Write(prefaceData, 0, prefaceData.Length);
clientStream.Flush();
// Start reading the stream on another thread
var readTask = new Thread(() => {
try { read(); }
catch (Exception ex)
{
Log.Debug("Read error: " + ex);
Disconnect();
}
Disconnect();
});
readTask.Start();
// Start a thread to handle writing queued frames to the stream
var writeTask = new Thread(() => {
try
{
write();
}
catch
{
Disconnect();
}
});
writeTask.Start();
// Send initial blank settings frame
var s = new SettingsFrame();
if (ConnectionSettings.DisablePushPromise)
{
s.EnablePush = false;
}
QueueFrame(s);
}
IFrame dequeue()
{
IFrame result = null;
semaphoreFrames.WaitOne();
foreach (var priority in PRIORITIES)
{
var frames = frameQueues [priority];
if (frames.Count > 0)
{
int frameIndex = -1; // counter of position in the loop
// Loop until we find a frame that we can send (if so)
foreach (var frame in frames)
{
frameIndex++; // we use this later to check for items in the queue prior to the current frame
// Consider that we may need to skip data frames
// if the flow control window is depleted or too small for the payload
if (frame.Type == FrameType.Data)
{
// See if either the connection flow control or the frame's stream's flow control
// window size has capacity for the data payload
// if not, let's skip over this frame
if (flowControlManager.GetWindowSize(0) - frame.PayloadLength < 0 ||
flowControlManager.GetWindowSize(frame.StreamIdentifier) - frame.PayloadLength < 0)
{
continue;
}
}
else if (frame.Type == FrameType.Headers || frame.Type == FrameType.Continuation)
{
// If we have HEADERS or CONTINUATION frames these are considered trailers and could appear after
// a DATA frame in the queue.
// Problem is, if the DATA frame needs to be paused for flow control,
// we also want to pause the trailing frames, so let's look and see
// if the frame has any DATA frames still in the queue before it, from the same stream
// if so, skip sending the trailers.
if (AltLinq.Any(AltLinq.Take(frames, frameIndex), f => f.StreamIdentifier == frame.StreamIdentifier && f.Type == FrameType.Data))
{
continue;
}
}
// If we made it this far, we found a frame we can send
// Let's keep it and stop looking for more in this list
result = frame;
break;
}
if (result != null)
{
// Remove the found item from the list
frames.Remove(result);
// exit the loop
break;
}
}
}
semaphoreFrames.Release();
return(result);
}
public async Task Connect()
{
if (IsConnected())
{
return;
}
tcp = new TcpClient();
// Disable Nagle for HTTP/2
tcp.NoDelay = true;
await tcp.ConnectAsync(ConnectionSettings.Host, (int)ConnectionSettings.Port).ConfigureAwait(false);
try
{
if (ConnectionSettings.UseTls)
{
clientStream = await ConnectionSettings.CreateStream(tcp);
}
else
{
clientStream = tcp.GetStream();
}
}
catch
{
if (!IsConnected())
{
tcp.Close();
}
throw;
}
// Ensure we have a size for the stream '0'
flowControlManager.GetWindowSize(0);
// Send out preface data
var prefaceData = System.Text.Encoding.ASCII.GetBytes(ConnectionPreface);
await clientStream.WriteAsync(prefaceData, 0, prefaceData.Length).ConfigureAwait(false);
await clientStream.FlushAsync().ConfigureAwait(false);
// Start reading the stream on another thread
var readTask = Task.Factory.StartNew(() => {
try { read(); }
catch (Exception ex) {
Log.Debug("Read error: " + ex);
Disconnect();
}
}, TaskCreationOptions.LongRunning);
readTask.ContinueWith(t => {
// TODO: Handle the error
Disconnect();
}, TaskContinuationOptions.OnlyOnFaulted).Forget();
// Start a thread to handle writing queued frames to the stream
var writeTask = Task.Factory.StartNew <Task>(write, TaskCreationOptions.LongRunning);
writeTask.ContinueWith(t => {
// TODO: Handle the error
Disconnect();
}, TaskContinuationOptions.OnlyOnFaulted).Forget();
// Send initial blank settings frame
var s = new SettingsFrame();
if (ConnectionSettings.DisablePushPromise)
{
s.EnablePush = false;
}
await QueueFrame(s).ConfigureAwait(false);
}
