public async Task ProcessRssFeeds()
{
// Asynchronous ForEach
List <Task> feeds = new List <Task>();
// More Optimized since evaluation is only done once.
List <Guild> guilds = await _database.Guilds.Include(x => x.RssFeeds).Include(x => x.RssRecentUrls).Include(x => x.RssRoles).Where(x => x.EnableRssFeed && x.RssFeeds.Count > 0).ToListAsync();
await _log.LogMessage(new LogMessage(LogSeverity.Debug, "RSS", "Processing RSS Service: " + guilds.Count + " guilds"));
foreach (var guild in guilds)
{
await _log.LogMessage(new LogMessage(LogSeverity.Debug, "RSS", "Guild: Updating " + guild.RssFeeds.Count + " feeds"));
foreach (var feed in guild.RssFeeds)
{
await _log.LogMessage(new LogMessage(LogSeverity.Debug, "RSS", "Feed: Readying " + feed.FeedUrl));
feeds.Add(Task.Run(async() =>
{
await _log.LogMessage(new LogMessage(LogSeverity.Debug, "RSS", "Feed: Updating " + feed.FeedUrl));
try
{
RssDataObject rssData = await GetRssAsync(feed.FeedUrl);
List <RssItem> rssPosts = await ExcludeRecentPosts(feed, rssData);
SocketGuild socketGuild = _client.GetGuild(Convert.ToUInt64(guild.GuildId));
List <Object> rssMessages = await BuildRssFeedAsync(feed, rssPosts, socketGuild);
var channel = socketGuild.GetChannel(feed.ChannelId) as SocketTextChannel;
await SendToChannel(rssMessages, channel, feed, socketGuild);
// This all happens behind scenes, so doesn't inhibit the performance
await SaveRecentUrls(feed.Id, feed.Guild.Id, rssPosts);
}
catch (Exception ex)
{
await _log.LogMessage(new LogMessage(LogSeverity.Error, "RSS", ex.Message, ex));
}
}));
}
}
// Run each feed in parallel and wait until all are completed
await Task.WhenAll(feeds);
await _database.SaveChangesAsync();
}
private async Task <List <RssItem> > ExcludeRecentPosts(RssFeed feed, RssDataObject rssData)
{
var recentUrls = feed.Guild.RssRecentUrls;
List <RssItem> posts = new List <RssItem>();
await Task.Run(() =>
{
foreach (var item in rssData.Data.Items.Take(10).Reverse())
{
if (!(recentUrls.Select(x => x.RecentUrl).Contains(item.Link)))
{
posts.Add(item);
}
}
});
return(posts);
}