private Task<bool> RefreshAsync(Guid id, bool force = false)
{
var task = new TaskCompletionSource<bool>();
var feed = _context.Feeds.Include(f => f.Items).Single(f => f.Id == id);
if (!force && feed.LastUpdateDateTime > GetExpiryDate(feed))
{
task.SetResult(true);
return task.Task;
}
var rssFeed = new RssFeed(new Uri(feed.FeedUrl));
// async callback
rssFeed.FeedLoaded += (sender, args) =>
{
foreach (var rssItem in rssFeed.Items)
{
// exist?
var item = feed.Items.FirstOrDefault(i => i.LinkUrl == rssItem.Id);
// update
if (item != null)
{
item.Name = rssItem.Title;
item.Raw = rssItem.Raw;
item.Content = HtmlCleanerHelper.Clean(rssItem.Raw);
item.Snippet = HtmlCleanerHelper.GetSnippet(rssItem.Raw, 200);
item.PublishedDateTime = GetPublishedDateTime(rssItem.PublishedDateTime);
continue;
}
Debug.WriteLine("found new items");
// insert
feed.Items.Add(new Item
{
Id = Guid.NewGuid(),
LinkUrl = rssItem.Id,
Name = rssItem.Title,
Raw = rssItem.Raw,
Content = HtmlCleanerHelper.Clean(rssItem.Raw),
Snippet = HtmlCleanerHelper.GetSnippet(rssItem.Raw, 200),
PublishedDateTime = GetPublishedDateTime(rssItem.PublishedDateTime)
});
}
feed.LastUpdateDateTime = DateTime.UtcNow;
task.SetResult(true);
};
// begin async load
rssFeed.GetItemsFromWeb();
return task.Task;
}
public Guid Add(Uri feedUrl, Guid? folderId)
{
var feed = _context.Feeds.Create();
feed.Id = Guid.NewGuid();
feed.FeedUrl = feedUrl.ToString();
feed.FolderId = folderId;
feed.UpdateFrequency = 3;
feed.UpdatePeriod = "Daily";
var rssFeed = new Manager.Feed(feedUrl);
RefreshResetEvent.Reset();
rssFeed.FeedLoaded += (sender, args) =>
{
feed.Name = rssFeed.Title ?? "can't find title";
feed.HtmlUrl = rssFeed.HtmlUri.ToString();
// oh man this is dodgy
// ah feel a rewrite a coming on
_context.Feeds.Add(feed);
_context.SaveChanges();
_context.Feeds.Add(feed);
RefreshResetEvent.Set();
};
rssFeed.GetItemsFromWeb();
// TODO: consider async/await, but it's abit tricky without modifying the interface signature
RefreshResetEvent.WaitOne(TimeSpan.FromSeconds(20));
return feed.Id;
}