private void CancelCall(Status status)
{
// Set overall call status first. Status can be used in throw RpcException from cancellation.
// If response has successfully finished then the status will come from the trailers.
// If it didn't finish then complete with a status.
_callTcs.TrySetResult(status);
// Checking if cancellation has already happened isn't threadsafe
// but there is no adverse effect other than an extra log message
if (!_callCts.IsCancellationRequested)
{
GrpcCallLog.CanceledCall(Logger);
// Cancel in-progress HttpClient.SendAsync and Stream.ReadAsync tasks.
// Cancel will send RST_STREAM if HttpClient.SendAsync isn't complete.
// Cancellation will also cause reader/writer to throw if used afterwards.
_callCts.Cancel();
// Cancellation token won't send RST_STREAM if HttpClient.SendAsync is complete.
// Dispose HttpResponseMessage to send RST_STREAM to server for in-progress calls.
HttpResponse?.Dispose();
// Canceling call will cancel pending writes to the stream
ClientStreamWriter?.WriteStreamTcs.TrySetCanceled();
ClientStreamWriter?.CompleteTcs.TrySetCanceled();
ClientStreamReader?.HttpResponseTcs.TrySetCanceled();
}
}
