internal CancelableReadState(byte[] buffer, int offset, int count,
CurlResponseStream responseStream, CancellationToken cancellationToken) :
base(buffer, offset, count)
{
_stream = responseStream;
_token = cancellationToken;
}
internal CurlResponseMessage(EasyRequest easy)
{
Debug.Assert(easy != null, "Expected non-null EasyRequest");
_easy = easy;
_responseStream = new CurlResponseStream(easy);
RequestMessage = easy._requestMessage;
Content = new StreamContent(_responseStream);
}
internal CurlResponseMessage(EasyRequest easy)
{
Debug.Assert(easy != null, "Expected non-null EasyRequest");
RequestMessage = easy._requestMessage;
ResponseStream = new CurlResponseStream(easy);
Content = new StreamContent(ResponseStream);
// On Windows, we pass the equivalent of the easy._cancellationToken
// in to StreamContent's ctor. This in turn passes that token through
// to ReadAsync operations on the stream response stream when HttpClient
// reads from the response stream to buffer it with ResponseContentRead.
// We don't need to do that here in the Unix implementation as, until the
// SendAsync task completes, the handler will have registered with the
// CancellationToken with an action that will cancel all work related to
// the easy handle if cancellation occurs, and that includes canceling any
// pending reads on the response stream. It wouldn't hurt anything functionally
// to still pass easy._cancellationToken here, but it will increase costs
// a bit, as each read will then need to allocate a larger state object as
// well as register with and unregister from the cancellation token.
}
private unsafe static size_t CurlReceiveBodyCallback(
byte *buffer,
size_t size,
size_t nitems,
IntPtr context)
{
size *= nitems;
GCHandle gch = GCHandle.FromIntPtr(context);
var state = (RequestCompletionSource)gch.Target;
try
{
// Set task completion after all headers have been received
// Fail if we find that task is already Canceled or Faulted
if (state.Task.IsCanceled || state.Task.IsFaulted)
{
// Returing a value other than size fails the callback and forces
// request completion with an error
return((size > 0) ? size - 1 : 1);
}
state.TrySetResult(state.ResponseMessage);
// Wait for a reader
// TODO: The below call blocks till all the data has been read since
// response body is not suppored to be buffered in memory.
// Figure out some way to work around this
CurlResponseStream contentStream = state.ResponseMessage.ContentStream;
contentStream.WaitAndSignalReaders(buffer, (long)size);
return(size);
}
catch (Exception ex)
{
HandleAsyncException(state, ex);
// Returing a value other than size fails the callback and forces
// request completion with an error
return((size > 0) ? size - 1 : 1);
}
}
internal CancelableReadState(Memory <byte> buffer, CurlResponseStream responseStream, CancellationToken cancellationToken) : base(buffer)
{
_stream = responseStream;
_token = cancellationToken;
}
internal CancelableReadState(Memory <byte> buffer, CurlResponseStream responseStream) : base(buffer)
{
_stream = responseStream;
}