/// <summary>
/// Provides all available feeds async.
/// </summary>
/// <param name="token">Cancelation token</param>
/// <returns>Feed's or empty list in case of fail.</returns>
public async Task <IEnumerable <Feed> > GetFeedsAsync(CancellationToken token)
{
IEnumerable <Feed> feeds = new List <Feed>();
try
{
var rowFeeds = await _client.GetStringAsync(new Uri("https://news.microsoft.com/feed/"));
feeds = _parser.Parse(rowFeeds);
await _storage.SaveFeedsAsync(new ReadOnlyCollection <Feed>(feeds.ToList()), CancellationToken.None);
var allFeeds = await _storage.GetAllFeeds().FirstOrDefaultAsync();
var oldNews = allFeeds.Where(l2 => feeds.All(l1 => l1.Id != l2.Id));
oldNews.Select(async item =>
{
// Remove old feeds.
await _storage.DeleteFeedAsync(item.Id, token);
await _storage.DeleteFeedArticleAsync(item.Id, token);
}).ToList();
}
catch
{
// nothing to do here.
}
return(feeds);
}
public async Task <Feed> Execute()
{
var httpClient = new HttpClient(_httpMessageHandler);
try
{
var responseString = await httpClient.GetStringAsync(FeedUrl)
.ConfigureAwait(false);
var feed = _feedParser.Parse(responseString);
return(feed);
}
catch
{
return(null);
}
}