private async Task <Option <UserIndexedByEmail> > ReadUserByEmailIndexedEventAsync(string email)
{
var maybeResolvedEvent = await _connection.ReadLastStreamEvent(StreamBy(email));
return(maybeResolvedEvent.Map(
resolvedEvent =>
{
var fromEventData = _eventSerializer.FromEventData(resolvedEvent.OriginalEvent);
if (!fromEventData.HasValue)
{
throw new Exception($"Could not read event of type {resolvedEvent.OriginalEvent.EventType}");
}
var @event = fromEventData.ValueOrFailure();
if (!(@event is UserIndexedByEmail))
{
var message = $"Expected event of type {typeof (UserIndexedByEmail).FullName} " +
"but was '{@event.GetType().FullName}'";
throw new Exception(message);
}
return @event as UserIndexedByEmail;
}));
}