public async Task <Either <BaseError, PtsAndDuration> > Handle(
GetLastPtsDuration request,
CancellationToken cancellationToken)
{
Validation <BaseError, RequestParameters> validation = await Validate(request);
return(await validation.Match(
parameters => Handle(parameters, cancellationToken),
error => Task.FromResult <Either <BaseError, PtsAndDuration> >(error.Join())));
}
private async Task <Validation <BaseError, RequestParameters> > Validate(GetLastPtsDuration request) => await ValidateFFprobePath().MapT(ffprobePath => new RequestParameters(request.ChannelNumber, ffprobePath));