private async Task Write(ChannelWriter <SensorReading> writer, SensorReading val, CancellationToken cancellationToken)
{
try
{
await writer.WriteAsync(val, cancellationToken);
}
catch (Exception ex)
{
writer.TryComplete(ex);
}
}
// TODO: investigate SignalR 3 pub-sub
// TODO: dotnet core 3 async enumerables
public ChannelReader <SensorReading> StartListening(string sensorIdentifier, CancellationToken cancellationToken)
{
var channel = Channel.CreateUnbounded <SensorReading>();
_sensorManager.GetSensorObservable(sensorIdentifier)
.Subscribe(val =>
{
var sensorReading = new SensorReading
{
Value = val,
Timestamp = DateTime.Now
};
_ = Write(channel.Writer, sensorReading, cancellationToken);
}, cancellationToken);
return(channel.Reader);
}