public async Task IfSettingsDecreaseHeaderTableNextOutgoingHeadersShouldContainAnUpdate()
{
var inPipe = new BufferedPipe(1024);
var outPipe = new BufferedPipe(1024);
Func <IStream, bool> listener = (s) =>
{
Task.Run(() =>
{
var res = new HeaderField[]
{
new HeaderField {
Name = ":status", Value = "200"
},
};
s.WriteHeadersAsync(res, false);
});
return(true);
};
var http2Con = await ConnectionUtils.BuildEstablishedConnection(
true, inPipe, outPipe, loggerProvider, listener);
// Change remote settings 2 times
var settings = Settings.Default;
settings.HeaderTableSize = 8;
await inPipe.WriteSettings(settings);
await outPipe.AssertSettingsAck();
settings.HeaderTableSize = 30;
await inPipe.WriteSettings(settings);
await outPipe.AssertSettingsAck();
// Establish a stream
// When we send a response through it we should observe the size udpate
var hEncoder = new Encoder();
await inPipe.WriteHeaders(hEncoder, 1, false, DefaultGetHeaders);
// Wait for the incoming status headers with header update
var fh = await outPipe.ReadFrameHeaderWithTimeout();
Assert.Equal(FrameType.Headers, fh.Type);
Assert.Equal((byte)(HeadersFrameFlags.EndOfHeaders), fh.Flags);
Assert.Equal(1u, fh.StreamId);
Assert.Equal(3, fh.Length);
var data = new byte[fh.Length];
await outPipe.ReadAllWithTimeout(new ArraySegment <byte>(data));
Assert.Equal(0x28, data[0]); // Size Update to 8
Assert.Equal(0x3e, data[1]); // Size Update to 30
Assert.Equal(0x88, data[2]); // :status 200
}
public async Task ShouldGoAwayWhenStreamWindowIsOverflowedThroughSettingsUpdate()
{
var inPipe = new BufferedPipe(1024);
var outPipe = new BufferedPipe(1024);
var res = await ServerStreamTests.StreamCreator.CreateConnectionAndStream(
StreamState.Open, loggerProvider, inPipe, outPipe);
// Let the remote increase the flow control window of the stream
await inPipe.WriteWindowUpdate(
1u,
(int)(int.MaxValue - Settings.Default.InitialWindowSize));
// Should be still alive
await inPipe.WritePing(new byte[8], false);
await outPipe.ReadAndDiscardPong();
// And now write new settings which overflow the window
var newSettings = Settings.Default;
newSettings.InitialWindowSize++;
await inPipe.WriteSettings(newSettings);
// Dead through overflow
await outPipe.AssertGoAwayReception(ErrorCode.FlowControlError, 1u);
}
public async Task ConnectionShouldGoAwayOnSettingsAckWithNonZeroLength(
int frameLength)
{
var inPipe = new BufferedPipe(1024);
var outPipe = new BufferedPipe(1024);
var http2Con = BuildConnection(true, Settings.Default, inPipe, outPipe);
await ClientPreface.WriteAsync(inPipe);
await inPipe.WriteSettings(Settings.Default);
// Wait for remote settings
await outPipe.ReadAndDiscardSettings();
// Wait for ack to our settings
await outPipe.AssertSettingsAck();
var fh = new FrameHeader
{
Type = FrameType.Settings,
Flags = (byte)SettingsFrameFlags.Ack,
StreamId = 0,
Length = frameLength,
};
await inPipe.WriteFrameHeader(fh);
// Wait for GoAway due to wrong stream ID
await outPipe.AssertGoAwayReception(ErrorCode.ProtocolError, 0);
await outPipe.AssertStreamEnd();
}
public async Task ConnectionShouldGoAwayOnUnsolicitedSettingsAck()
{
var inPipe = new BufferedPipe(1024);
var outPipe = new BufferedPipe(1024);
var http2Con = BuildConnection(true, Settings.Default, inPipe, outPipe);
await ClientPreface.WriteAsync(inPipe);
await inPipe.WriteSettings(Settings.Default);
// Wait for remote settings
await outPipe.ReadAndDiscardSettings();
// Wait for ack to our settings
await outPipe.AssertSettingsAck();
// Acknowledge remote settings 2 times
await inPipe.WriteSettingsAck();
await inPipe.WriteSettingsAck();
// Wait for GoAway due to multiple ACKs
await outPipe.AssertGoAwayReception(ErrorCode.ProtocolError, 0);
await outPipe.AssertStreamEnd();
}
public async Task NegativeFlowControlWindowsThroughSettingsShouldBeSupported()
{
var inPipe = new BufferedPipe(1024);
var outPipe = new BufferedPipe(1024);
// Start with a stream window of 10
var settings = Settings.Default;
settings.InitialWindowSize = 10;
var res = await ServerStreamTests.StreamCreator.CreateConnectionAndStream(
StreamState.Open, loggerProvider, inPipe, outPipe,
remoteSettings : settings);
// Initiate response by sending and consuming headers
await res.stream.WriteHeadersAsync(
DefaultStatusHeaders, false);
await outPipe.ReadAndDiscardHeaders(1u, false);
// Start to write 20 bytes of data
var writeTask = Task.Run(async() =>
{
var data = new byte[20];
await res.stream.WriteAsync(new ArraySegment <byte>(data), true);
});
// Expect to receive the first 10 bytes
await outPipe.ReadAndDiscardData(1u, false, 10);
// Stream has now a window of 0
// Decrease that to -10 by decreasing the initial window
settings.InitialWindowSize = 0;
await inPipe.WriteSettings(settings);
await outPipe.AssertSettingsAck();
// Increase to 0 with window update
await inPipe.WriteWindowUpdate(1u, 10);
// Check that we get no data so far by ping/pong
// If the negative window is not applied we would get new data here
await inPipe.WritePing(new byte[8], false);
await outPipe.ReadAndDiscardPong();
// Increase to 10 with window update
await inPipe.WriteWindowUpdate(1u, 10);
// Expect the remaining 10 bytes of data
await outPipe.ReadAndDiscardData(1u, true, 10);
Assert.Equal(StreamState.HalfClosedLocal, res.stream.State);
}
public async Task ConnectionShouldAcknowledgeValidSettings()
{
var inPipe = new BufferedPipe(1024);
var outPipe = new BufferedPipe(1024);
var http2Con = BuildConnection(true, Settings.Default, inPipe, outPipe);
await ClientPreface.WriteAsync(inPipe);
await inPipe.WriteSettings(Settings.Default);
await outPipe.ReadAndDiscardSettings();
await outPipe.AssertSettingsAck();
}
public async Task ConnectionShouldAcceptSettingsAckAndNotGoAway()
{
var inPipe = new BufferedPipe(1024);
var outPipe = new BufferedPipe(1024);
var http2Con = BuildConnection(true, Settings.Default, inPipe, outPipe);
await ClientPreface.WriteAsync(inPipe);
await inPipe.WriteSettings(Settings.Default);
// Wait for remote settings
await outPipe.ReadAndDiscardSettings();
// Wait for ack to our settings
await outPipe.AssertSettingsAck();
// Acknowledge remote settings
await inPipe.WriteSettingsAck();
// And expect that no GoAway follows - which means a timeout happens on read
await outPipe.AssertReadTimeout();
}
public async Task TheRemoteHeaderTableSizeShouldOnlyBeUsedUpToConfiguredLimit()
{
var inPipe = new BufferedPipe(1024);
var outPipe = new BufferedPipe(1024);
var handlerDone = new SemaphoreSlim(0);
Func <IStream, bool> listener = (s) =>
{
Task.Run(() =>
{
var res = new HeaderField[]
{
new HeaderField {
Name = ":status", Value = "200"
},
};
s.WriteHeadersAsync(res, false);
});
handlerDone.Release();
return(true);
};
// Lower the initial window size so that stream window updates are
// sent earlier than connection window updates
var localSettings = Settings.Default;
localSettings.HeaderTableSize = 20000;
var http2Con = await ConnectionUtils.BuildEstablishedConnection(
true, inPipe, outPipe, loggerProvider, listener,
localSettings : localSettings);
// Change remote settings, which grants us a giant header table
var settings = Settings.Default;
settings.HeaderTableSize = 50 * 1024 * 1024;
await inPipe.WriteSettings(settings);
await outPipe.AssertSettingsAck();
// Establish a stream
// When we send a response through it we should observe the size udpate
var hEncoder = new Encoder();
await inPipe.WriteHeaders(hEncoder, 1, false, DefaultGetHeaders);
var ok = await handlerDone.WaitAsync(
ReadableStreamTestExtensions.ReadTimeout);
if (!ok)
{
throw new Exception("Stream was not created");
}
// Wait for the incoming status headers with header update
var fh = await outPipe.ReadFrameHeaderWithTimeout();
Assert.Equal(FrameType.Headers, fh.Type);
Assert.Equal((byte)(HeadersFrameFlags.EndOfHeaders), fh.Flags);
Assert.Equal(1u, fh.StreamId);
// Observe headers with status update
// We should update the header table to 20000
Assert.Equal(5, fh.Length);
var data = new byte[fh.Length];
await outPipe.ReadAllWithTimeout(new ArraySegment <byte>(data));
Assert.Equal(0x3f, data[0]); // Size Update to 20000 => 20000 - 31 = 19969
Assert.Equal(0x81, data[1]); // 19969 % 128 + 128 = 0x81, 19969 / 128 = 156
Assert.Equal(0x9c, data[2]); // 156 % 128 + 128 = 0x9c, 156 / 128 = 1
Assert.Equal(0x01, data[3]); // 1
Assert.Equal(0x88, data[4]); // :status 200
}
