🚧 RSS as a module

2026-07-31 00:29:24 +03:00 · 2020-03-02 00:00:52 +04:00
parent e86049f4fd
commit eac0da5016
16 changed files with 1185 additions and 0 deletions
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+using System;
+using System.Linq;
+using System.Threading.Tasks;
+using Kruzya.TelegramBot.RichSiteSummary.Data;
+using Microsoft.EntityFrameworkCore;
+using Telegram.Bot.Types;
+
+namespace Kruzya.TelegramBot.RichSiteSummary
+{
+    public static class RichSiteSummaryRepositoryExtension
+    {
+        #region Subscriber
+
+        /// <summary>
+        /// Searchs the <see cref="Subscriber"/>, who reads a <see cref="Feed"/>.
+        /// </summary>
+        /// <param name="repository"></param>
+        /// <param name="feed"></param>
+        /// <returns>The array with all subscribers.</returns>
+        public static async Task<Subscriber[]> ByFeed(this DbSet<Subscriber> repository, Feed feed)
+        {
+            return await repository.Where(subscriber => subscriber.Feed == feed)
+                .ToArrayAsync();
+        }
+
+        public static IQueryable<Subscriber> AllSubscriptions(this DbSet<Subscriber> repository, Chat chat)
+        {
+            return repository.Where(entity => entity.SubscriberId == chat.Id);
+        }
+
+        public static async Task<bool> HasSubscription(this DbSet<Subscriber> repository, Chat chat, Feed feed)
+        {
+            return (await repository.Where(subscriber => subscriber.Feed == feed && subscriber.SubscriberId == chat.Id)
+                       .CountAsync()) != 0;
+        }
+
+        #endregion
+        
+        #region Feed
+
+        /// <summary>
+        /// Searchs the <see cref="Feed"/> for fetching.
+        /// </summary>
+        /// <param name="repository"></param>
+        /// <param name="period">The period (in seconds) from last fetching.</param>
+        /// <param name="count">Max results count</param>
+        /// <returns></returns>
+        public static async Task<Feed[]> ForFetching(this DbSet<Feed> repository, UInt16 period, UInt16 count) =>
+            await repository.Where(feed => feed.UpdatedAt < (DateTime.Now - TimeSpan.FromSeconds(period)))
+                .OrderBy(feed => feed.UpdatedAt)
+                .Take(count)
+                .ToArrayAsync();
+
+        /// <summary>
+        /// Searchs the <see cref="Feed"/> for fetching.
+        /// </summary>
+        /// <param name="repository"></param>
+        /// <param name="period">The period (in seconds) from last fetching.</param>
+        /// <returns></returns>
+        public static async Task<Feed[]> ForFetching(this DbSet<Feed> repository, UInt16 period) =>
+            await repository.ForFetching(period, 25);
+
+        #endregion
+        
+        #region Post
+
+        public static async Task<Post> ByFeedAndUrl(this DbSet<Post> repository, string url, Feed feed = null) =>
+            await repository.FirstOrDefaultAsync(post => post.Url == url && (feed == null || post.Feed == feed));
+
+        #endregion
+    }
+}