public async Task <bool> Handle(UnSubscribeDatasourceCommand request, CancellationToken cancellationToken)
{
var feed = await _feedCommandRepository.Get(request.FeedId, cancellationToken);
if (feed == null)
{
_logger.LogError($"Feed {request.FeedId} doesn't exist");
throw new NewsAggregatorResourceNotFoundException(string.Format(Global.FeedDoesntExist, feed.Id));
}
feed.UnsubscribeDataSource(request.UserId, request.DatasourceId);
var datasources = await _dataSourceService.Get(new string[] { request.DatasourceId }, cancellationToken);
if (!datasources.Any())
{
_logger.LogError($"DataSource {request.DatasourceId} doesn't exist");
throw new NewsAggregatorException(string.Format(Global.DataSourceDoesntExist, request.DatasourceId));
}
await _feedCommandRepository.Update(feed, cancellationToken);
await _feedCommandRepository.SaveChanges(cancellationToken);
_logger.LogInformation($"Unsubscribe from the datasource {request.DatasourceId} of the feed {request.FeedId}");
return(true);
}
public async Task <string> Handle(AddFeedCommand request, CancellationToken cancellationToken)
{
var isNewFeed = false;
var feed = await _feedCommandRepository.Get(request.UserId, request.Title, cancellationToken);
var evts = new List <FeedDataSourceSubscribedEvent>();
if (feed == null)
{
feed = FeedAggregate.Create(request.UserId, request.Title);
isNewFeed = true;
}
if (request.DatasourceIds != null)
{
var datasources = await _dataSourceService.Get(request.DatasourceIds, cancellationToken);
var missingDatasources = request.DatasourceIds.Where(d => !datasources.Any(ds => ds.Id == d));
if (missingDatasources.Any())
{
throw new NewsAggregatorException(string.Format(Global.UnknownDataSource, string.Join(",", missingDatasources)));
}
foreach (var datasource in datasources)
{
evts.Add(feed.SubscribeDataSource(request.UserId, datasource.Id));
}
}
if (isNewFeed)
{
await _feedCommandRepository.Add(feed, cancellationToken);
}
else
{
await _feedCommandRepository.Update(feed, cancellationToken);
}
await _feedCommandRepository.SaveChanges(cancellationToken);
_logger.LogInformation($"User {request.UserId} adds the feed {request.Title}");
foreach (var evt in evts)
{
await _busControl.Publish(evt, cancellationToken);
}
return(feed.Id);
}
public async Task <bool> Handle(DeleteFeedCommand request, CancellationToken cancellationToken)
{
var feed = await _feedCommandRepository.Get(request.FeedId, cancellationToken);
if (feed == null)
{
_logger.LogError($"Feed {request.FeedId} doesn't exist");
throw new NewsAggregatorResourceNotFoundException(string.Format(Global.FeedDoesntExist, feed.Id));
}
feed.Remove(request.UserId);
await _feedCommandRepository.Delete(feed, cancellationToken);
await _feedCommandRepository.SaveChanges(cancellationToken);
_logger.LogInformation($"the feed {request.FeedId} is removed");
return(true);
}