public async Task SetLightState(LightStateViewModel lightState)
{
var transition = GetLightSwitchTransition(lightState.State);
lightState.State = transition[0];
// trigger light changing on all clients to disable switch
_controlHub.Clients.All.SetLightState(lightState);
// save new state to db so new requests fetch updated state
var cancellationTokenSource = new CancellationTokenSource();
var cancellationToken = cancellationTokenSource.Token;
var saving = _lightSwitchDbService.SetLightState(lightState, cancellationToken);
// send request to set light
lightState.State = transition[1];
var transitionRequestSent = _queueService.SendLightState(lightState);
if (!transitionRequestSent)
{
// could not send transition request, rollback all actions
cancellationTokenSource.Cancel();
}
await saving;
}