public async Task DoesNotThrowIfOnReadCallbackCalledWithEOFButAllocCallbackNotCalled()
{
var mockLibuv = new MockLibuv();
var transportContext = new TestLibuvTransportContext();
var thread = new LibuvThread(mockLibuv, transportContext);
var listenerContext = new ListenerContext(transportContext)
{
Thread = thread
};
try
{
await thread.StartAsync();
await thread.PostAsync(_ =>
{
var socket = new MockSocket(mockLibuv, Thread.CurrentThread.ManagedThreadId, transportContext.Log);
listenerContext.HandleConnection(socket);
var ignored = new LibuvFunctions.uv_buf_t();
mockLibuv.ReadCallback(socket.InternalGetHandle(), TestConstants.EOF, ref ignored);
}, (object)null);
await using var connection = await listenerContext.AcceptAsync();
var readAwaitable = await connection.Transport.Input.ReadAsync();
Assert.True(readAwaitable.IsCompleted);
}
finally
{
await thread.StopAsync(TimeSpan.FromSeconds(5));
}
}
public async Task DoesNotEndConnectionOnZeroRead()
{
var mockLibuv = new MockLibuv();
var transportContext = new TestLibuvTransportContext();
var thread = new LibuvThread(mockLibuv, transportContext);
var listenerContext = new ListenerContext(transportContext)
{
Thread = thread
};
try
{
await thread.StartAsync();
await thread.PostAsync(_ =>
{
var socket = new MockSocket(mockLibuv, Thread.CurrentThread.ManagedThreadId, transportContext.Log);
listenerContext.HandleConnection(socket);
mockLibuv.AllocCallback(socket.InternalGetHandle(), 2048, out var ignored);
mockLibuv.ReadCallback(socket.InternalGetHandle(), 0, ref ignored);
}, (object)null);
await using var connection = await listenerContext.AcceptAsync();
var readAwaitable = connection.Transport.Input.ReadAsync();
Assert.False(readAwaitable.IsCompleted);
}
finally
{
await thread.StopAsync(TimeSpan.FromSeconds(5));
}
}
public async Task ConnectionDoesNotResumeAfterSocketCloseIfBackpressureIsApplied()
{
var mockLibuv = new MockLibuv();
var transportContext = new TestLibuvTransportContext();
var thread = new LibuvThread(mockLibuv, transportContext);
var listenerContext = new ListenerContext(transportContext)
{
Thread = thread,
InputOptions = new PipeOptions(
pool: thread.MemoryPool,
pauseWriterThreshold: 3,
readerScheduler: PipeScheduler.Inline,
writerScheduler: PipeScheduler.Inline,
useSynchronizationContext: false),
// We don't set the output writer scheduler here since we want to run the callback inline
OutputOptions = new PipeOptions(
pool: thread.MemoryPool,
readerScheduler: thread,
writerScheduler: PipeScheduler.Inline,
useSynchronizationContext: false)
};
try
{
await thread.StartAsync();
// Write enough to make sure back pressure will be applied
await thread.PostAsync <object>(_ =>
{
var socket = new MockSocket(mockLibuv, Thread.CurrentThread.ManagedThreadId, transportContext.Log);
listenerContext.HandleConnection(socket);
mockLibuv.AllocCallback(socket.InternalGetHandle(), 2048, out var ignored);
mockLibuv.ReadCallback(socket.InternalGetHandle(), 5, ref ignored);
}, null);
var connection = await listenerContext.AcceptAsync();
// Now assert that we removed the callback from libuv to stop reading
Assert.Null(mockLibuv.AllocCallback);
Assert.Null(mockLibuv.ReadCallback);
// Now complete the output writer so that the connection closes
await connection.DisposeAsync();
// Assert that we don't try to start reading
Assert.Null(mockLibuv.AllocCallback);
Assert.Null(mockLibuv.ReadCallback);
}
finally
{
await thread.StopAsync(TimeSpan.FromSeconds(5));
}
}
private static async Task <Task <LibuvConnection> > WaitForSecondaryListener(Uri address, ListenerContext listenerPrimary, ListenerContext listenerSecondary)
{
int maxRetries = 100;
int retryDelay = 100;
Task <LibuvConnection> primary = null;
Task <LibuvConnection> secondary = null;
for (var i = 0; i < maxRetries; i++)
{
primary ??= listenerPrimary.AcceptAsync().AsTask();
secondary ??= listenerSecondary.AcceptAsync().AsTask();
using var _ = await HttpClientSlim.GetSocket(address);
var task = await Task.WhenAny(primary, secondary);
if (task == secondary)
{
// Dispose this connection now that we know the seconary listener is working
await(await secondary).DisposeAsync();
// Return the primary task (it should be incomplete), we do this so that we can
return(primary);
}
else
{
// Dispose the connection
await(await primary).DisposeAsync();
primary = null;
}
await Task.Delay(retryDelay);
}
Assert.True(false, $"'{address}' failed to get queued connection in secondary listener in {maxRetries} retries.");
return(null);
}
public async Task ConnectionDoesNotResumeAfterReadCallbackScheduledAndSocketCloseIfBackpressureIsApplied()
{
var mockLibuv = new MockLibuv();
var transportContext = new TestLibuvTransportContext();
var thread = new LibuvThread(mockLibuv, transportContext);
var mockScheduler = new Mock <PipeScheduler>();
Action backPressure = null;
mockScheduler.Setup(m => m.Schedule(It.IsAny <Action <object> >(), It.IsAny <object>())).Callback <Action <object>, object>((a, o) =>
{
backPressure = () => a(o);
});
var listenerContext = new ListenerContext(transportContext)
{
Thread = thread,
InputOptions = new PipeOptions(
pool: thread.MemoryPool,
pauseWriterThreshold: 3,
resumeWriterThreshold: 3,
writerScheduler: mockScheduler.Object,
readerScheduler: PipeScheduler.Inline,
useSynchronizationContext: false),
OutputOptions = new PipeOptions(
pool: thread.MemoryPool,
readerScheduler: thread,
writerScheduler: PipeScheduler.Inline,
useSynchronizationContext: false)
};
try
{
await thread.StartAsync();
// Write enough to make sure back pressure will be applied
await thread.PostAsync <object>(_ =>
{
var socket = new MockSocket(mockLibuv, Thread.CurrentThread.ManagedThreadId, transportContext.Log);
listenerContext.HandleConnection(socket);
mockLibuv.AllocCallback(socket.InternalGetHandle(), 2048, out var ignored);
mockLibuv.ReadCallback(socket.InternalGetHandle(), 5, ref ignored);
}, null);
var connection = await listenerContext.AcceptAsync();
// Now assert that we removed the callback from libuv to stop reading
Assert.Null(mockLibuv.AllocCallback);
Assert.Null(mockLibuv.ReadCallback);
// Now release backpressure by reading the input
var result = await connection.Transport.Input.ReadAsync();
// Calling advance will call into our custom scheduler that captures the back pressure
// callback
connection.Transport.Input.AdvanceTo(result.Buffer.End);
// Cancel the current pending flush
connection.Application.Output.CancelPendingFlush();
// Now release the back pressure
await thread.PostAsync(a => a(), backPressure);
// Assert that we don't try to start reading since the write was cancelled
Assert.Null(mockLibuv.AllocCallback);
Assert.Null(mockLibuv.ReadCallback);
// Now complete the output writer and wait for the connection to close
await connection.DisposeAsync();
// Assert that we don't try to start reading
Assert.Null(mockLibuv.AllocCallback);
Assert.Null(mockLibuv.ReadCallback);
}
finally
{
await thread.StopAsync(TimeSpan.FromSeconds(5));
}
}