added tweet caching

src/BirdsiteLive.Twitter/CachedTwitterTweetsService.cs

@@ -0,0 +1,63 @@
+using System;
+using System.Text.Json;
+using System.Threading.Tasks;
+using BirdsiteLive.Common.Settings;
+using BirdsiteLive.Twitter.Models;
+using Microsoft.Extensions.Caching.Memory;
+
+namespace BirdsiteLive.Twitter
+{
+    public interface ICachedTwitterTweetsService : ITwitterTweetsService
+    {
+        void SetTweet(long id, ExtractedTweet tweet);
+    }
+
+    public class CachedTwitterTweetsService : ICachedTwitterTweetsService
+    {
+        private readonly ITwitterTweetsService _twitterService;
+
+        private readonly MemoryCache _tweetCache;
+        private readonly MemoryCacheEntryOptions _cacheEntryOptions = new MemoryCacheEntryOptions()
+            .SetSize(1)//Size amount
+            //Priority on removing when reaching size limit (memory pressure)
+            .SetPriority(CacheItemPriority.Low)
+            // Keep in cache for this time, reset time if accessed.
+            .SetSlidingExpiration(TimeSpan.FromMinutes(60))
+            // Remove from cache after this time, regardless of sliding expiration
+            .SetAbsoluteExpiration(TimeSpan.FromDays(1));
+
+        #region Ctor
+        public CachedTwitterTweetsService(ITwitterTweetsService twitterService, InstanceSettings settings)
+        {
+            _twitterService = twitterService;
+
+            _tweetCache = new MemoryCache(new MemoryCacheOptions()
+            {
+                SizeLimit = 10000 //TODO make this use number of entries in db
+            });
+        }
+        #endregion
+
+        public async Task<ExtractedTweet[]> GetTimelineAsync(string username, long id)
+        {
+            var res = await _twitterService.GetTimelineAsync(username, id);
+            return res;
+        }
+        public async Task<ExtractedTweet> GetTweetAsync(long id)
+        {
+            if (!_tweetCache.TryGetValue(id, out ExtractedTweet tweet))
+            {
+                tweet = await _twitterService.GetTweetAsync(id);
+                if(tweet != null) _tweetCache.Set(id, tweet, _cacheEntryOptions);
+            }
+
+            return tweet;
+        }
+
+        public void SetTweet(long id, ExtractedTweet tweet)
+        {
+
+            _tweetCache.Set(id, tweet, _cacheEntryOptions);
+        }
+    }
+}

src/BirdsiteLive/Controllers/UsersController.cs

@@ -26,14 +26,14 @@ namespace BirdsiteLive.Controllers
     public class UsersController : Controller
     {
         private readonly ITwitterUserService _twitterUserService;
-        private readonly ITwitterTweetsService _twitterTweetService;
+        private readonly ICachedTwitterTweetsService _twitterTweetService;
         private readonly IUserService _userService;
         private readonly IStatusService _statusService;
         private readonly InstanceSettings _instanceSettings;
         private readonly ILogger<UsersController> _logger;
 
         #region Ctor
-        public UsersController(ITwitterUserService twitterUserService, IUserService userService, IStatusService statusService, InstanceSettings instanceSettings, ITwitterTweetsService twitterTweetService, ILogger<UsersController> logger)
+        public UsersController(ITwitterUserService twitterUserService, IUserService userService, IStatusService statusService, InstanceSettings instanceSettings, ICachedTwitterTweetsService twitterTweetService, ILogger<UsersController> logger)
         {
             _twitterUserService = twitterUserService;
             _userService = userService;