public async Task <Unit> Handle(SubmitAnswerRequest request, CancellationToken cancellationToken)
{
var(participant, pollId, answer) = request;
var poll = await _repository.GetPoll(participant.ConferenceId, pollId);
if (poll == null)
{
throw PollError.PollNotFound.ToException();
}
var state = await _repository.GetPollState(participant.ConferenceId, pollId);
if (state?.IsOpen != true)
{
throw PollError.PollClosed.ToException();
}
if (answer == null)
{
if (poll.Config.IsAnswerFinal)
{
throw PollError.AnswerCannotBeChanged.ToException();
}
await _repository.DeletePollAnswer(participant, pollId);
}
else
{
var wrapper = new PollAnswerValidatorWrapper(_context);
var validationResult = wrapper.Validate(poll.Instruction, answer);
if (validationResult != null)
{
throw validationResult.ToException();
}
if (poll.Config.IsAnswerFinal)
{
var existingAnswer = await _repository.GetPollAnswer(participant, pollId);
if (existingAnswer != null)
{
throw PollError.AnswerCannotBeChanged.ToException();
}
}
var key = Guid.NewGuid().ToString("N");
await _repository.SetPollAnswer(participant, pollId, new PollAnswerWithKey(answer, key));
poll = await _repository.GetPoll(participant.ConferenceId, pollId);
if (poll == null)
{
// optimistic concurrency
await _repository.DeletePollAnswers(participant.ConferenceId, pollId);
throw PollError.PollNotFound.ToException();
}
}
await _mediator.Send(new UpdateSynchronizedObjectRequest(participant.ConferenceId,
SynchronizedPollAnswers.SyncObjId(participant.Id)));
await _mediator.Send(new UpdateSynchronizedObjectRequest(participant.ConferenceId,
SynchronizedPollResult.SyncObjId(pollId)));
return(Unit.Value);
}