private static void OnRequestReadComplete(WinHttpRequestState state, uint bytesRead)
{
Debug.Assert(state != null, "OnRequestReadComplete: state is null");
Debug.Assert(state.TcsReadFromResponseStream != null, "TcsReadFromResponseStream is null");
Debug.Assert(!state.TcsReadFromResponseStream.Task.IsCompleted, "TcsReadFromResponseStream.Task is completed");
state.DisposeCtrReadFromResponseStream();
// If we read to the end of the stream and we're using 'Content-Length' semantics on the response body,
// then verify we read at least the number of bytes required.
if (bytesRead == 0 &&
state.ExpectedBytesToRead.HasValue &&
state.CurrentBytesRead < state.ExpectedBytesToRead.Value)
{
state.TcsReadFromResponseStream.TrySetException(
new IOException(string.Format(
"net_http_io_read_incomplete: {0} - {1}",
state.ExpectedBytesToRead.Value,
state.CurrentBytesRead)));
}
else
{
state.CurrentBytesRead += (long)bytesRead;
state.TcsReadFromResponseStream.TrySetResult((int)bytesRead);
}
}
private static void OnRequestError(WinHttpRequestState state, Interop.WinHttp.WINHTTP_ASYNC_RESULT asyncResult)
{
WinHttpTraceHelper.TraceAsyncError("OnRequestError", asyncResult);
Debug.Assert(state != null, "OnRequestError: state is null");
Exception innerException = WinHttpException.CreateExceptionUsingError(unchecked ((int)asyncResult.dwError));
switch (unchecked ((uint)asyncResult.dwResult.ToInt32()))
{
case Interop.WinHttp.API_SEND_REQUEST:
state.TcsSendRequest.TrySetException(innerException);
break;
case Interop.WinHttp.API_RECEIVE_RESPONSE:
if (asyncResult.dwError == Interop.WinHttp.ERROR_WINHTTP_RESEND_REQUEST)
{
state.RetryRequest = true;
state.TcsReceiveResponseHeaders.TrySetResult(false);
}
else if (asyncResult.dwError == Interop.WinHttp.ERROR_WINHTTP_CLIENT_AUTH_CERT_NEEDED)
{
// WinHttp will automatically drop any client SSL certificates that we
// have pre-set into the request handle including the NULL certificate
// (which means we have no certs to send). For security reasons, we don't
// allow the certificate to be re-applied. But we need to tell WinHttp
// explicitly that we don't have any certificate to send.
Debug.Assert(state.RequestHandle != null, "OnRequestError: state.RequestHandle is null");
WinHttpHandler.SetNoClientCertificate(state.RequestHandle);
state.RetryRequest = true;
state.TcsReceiveResponseHeaders.TrySetResult(false);
}
else if (asyncResult.dwError == Interop.WinHttp.ERROR_WINHTTP_OPERATION_CANCELLED)
{
state.TcsReceiveResponseHeaders.TrySetCanceled(state.CancellationToken);
}
else
{
state.TcsReceiveResponseHeaders.TrySetException(innerException);
}
break;
case Interop.WinHttp.API_QUERY_DATA_AVAILABLE:
if (asyncResult.dwError == Interop.WinHttp.ERROR_WINHTTP_OPERATION_CANCELLED)
{
// TODO: Issue #2165. We need to pass in the cancellation token from the
// user's ReadAsync() call into the TrySetCanceled().
Debug.WriteLine("RequestCallback: QUERY_DATA_AVAILABLE - ERROR_WINHTTP_OPERATION_CANCELLED");
state.TcsQueryDataAvailable.TrySetCanceled();
}
else
{
state.TcsQueryDataAvailable.TrySetException(
new IOException("net_http_io_read", innerException));
}
break;
case Interop.WinHttp.API_READ_DATA:
state.DisposeCtrReadFromResponseStream();
if (asyncResult.dwError == Interop.WinHttp.ERROR_WINHTTP_OPERATION_CANCELLED)
{
// TODO: Issue #2165. We need to pass in the cancellation token from the
// user's ReadAsync() call into the TrySetCanceled().
Debug.WriteLine("RequestCallback: API_READ_DATA - ERROR_WINHTTP_OPERATION_CANCELLED");
state.TcsReadFromResponseStream.TrySetCanceled();
}
else
{
state.TcsReadFromResponseStream.TrySetException(
new IOException("net_http_io_read", innerException));
}
break;
case Interop.WinHttp.API_WRITE_DATA:
if (asyncResult.dwError == Interop.WinHttp.ERROR_WINHTTP_OPERATION_CANCELLED)
{
// TODO: Issue #2165. We need to pass in the cancellation token from the
// user's WriteAsync() call into the TrySetCanceled().
Debug.WriteLine("RequestCallback: API_WRITE_DATA - ERROR_WINHTTP_OPERATION_CANCELLED");
state.TcsInternalWriteDataToRequestStream.TrySetCanceled();
}
else
{
state.TcsInternalWriteDataToRequestStream.TrySetException(
new IOException("net_http_io_write", innerException));
}
break;
default:
Debug.Fail(
"OnRequestError: Result (" + asyncResult.dwResult + ") is not expected.",
"Error code: " + asyncResult.dwError + " (" + innerException.Message + ")");
break;
}
}
public override Task <int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken token)
{
if (buffer == null)
{
throw new ArgumentNullException(nameof(buffer));
}
if (offset < 0)
{
throw new ArgumentOutOfRangeException(nameof(offset));
}
if (count < 0)
{
throw new ArgumentOutOfRangeException(nameof(count));
}
if (count > buffer.Length - offset)
{
throw new ArgumentException("net_http_buffer_insufficient_length", nameof(buffer));
}
if (token.IsCancellationRequested)
{
return(Task.FromCanceled <int>(token));
}
CheckDisposed();
if (_state.TcsReadFromResponseStream != null && !_state.TcsReadFromResponseStream.Task.IsCompleted)
{
throw new InvalidOperationException("net_http_no_concurrent_io_allowed");
}
_state.PinReceiveBuffer(buffer);
_state.TcsReadFromResponseStream =
new TaskCompletionSource <int>(TaskCreationOptions.RunContinuationsAsynchronously);
_state.TcsQueryDataAvailable =
new TaskCompletionSource <int>(TaskCreationOptions.RunContinuationsAsynchronously);
_state.TcsQueryDataAvailable.Task.ContinueWith((previousTask) =>
{
if (previousTask.IsFaulted)
{
_state.DisposeCtrReadFromResponseStream();
_state.TcsReadFromResponseStream.TrySetException(previousTask.Exception.InnerException);
}
else if (previousTask.IsCanceled || token.IsCancellationRequested)
{
_state.DisposeCtrReadFromResponseStream();
_state.TcsReadFromResponseStream.TrySetCanceled(token);
}
else
{
int bytesToRead;
int bytesAvailable = previousTask.Result;
if (bytesAvailable > count)
{
bytesToRead = count;
}
else
{
bytesToRead = bytesAvailable;
}
lock (_state.Lock)
{
Debug.Assert(!_requestHandle.IsInvalid);
if (!Interop.WinHttp.WinHttpReadData(
_requestHandle,
Marshal.UnsafeAddrOfPinnedArrayElement(buffer, offset),
(uint)bytesToRead,
IntPtr.Zero))
{
_state.DisposeCtrReadFromResponseStream();
_state.TcsReadFromResponseStream.TrySetException(
new IOException("net_http_io_read", WinHttpException.CreateExceptionUsingLastError()));
}
}
}
},
CancellationToken.None, TaskContinuationOptions.None, TaskScheduler.Default);
// Register callback on cancellation token to cancel any pending WinHTTP operation.
if (token.CanBeCanceled)
{
WinHttpTraceHelper.Trace("WinHttpResponseStream.ReadAsync: registering for cancellation token request");
_state.CtrReadFromResponseStream =
token.Register(s => ((WinHttpResponseStream)s).CancelPendingResponseStreamReadOperation(), this);
}
else
{
WinHttpTraceHelper.Trace("WinHttpResponseStream.ReadAsync: received no cancellation token");
}
lock (_state.Lock)
{
Debug.Assert(!_requestHandle.IsInvalid);
if (!Interop.WinHttp.WinHttpQueryDataAvailable(_requestHandle, IntPtr.Zero))
{
_state.DisposeCtrReadFromResponseStream();
_state.TcsReadFromResponseStream.TrySetException(
new IOException("net_http_io_read", WinHttpException.CreateExceptionUsingLastError()));
}
}
return(_state.TcsReadFromResponseStream.Task);
}