Fixed: Heavy qbit api load when CDH Remove is disabled and Seeding time has been reached

ref #3108

src/NzbDrone.Core.Test/Download/DownloadClientTests/QBittorrentTests/QBittorrentFixture.cs

@@ -556,6 +556,22 @@ namespace NzbDrone.Core.Test.Download.DownloadClientTests.QBittorrentTests
             item.CanMoveFiles.Should().BeTrue();
         }
 
+        [Test]
+        public void should_not_fetch_details_twice()
+        {
+            GivenGlobalSeedLimits(-1, 30);
+            GivenCompletedTorrent("pausedUP", ratio: 2.0f, seedingTime: 20);
+
+            var item = Subject.GetItems().Single();
+            item.CanBeRemoved.Should().BeFalse();
+            item.CanMoveFiles.Should().BeFalse();
+            
+            var item2 = Subject.GetItems().Single();
+
+            Mocker.GetMock<IQBittorrentProxy>()
+                  .Verify(p => p.GetTorrentProperties(It.IsAny<string>(), It.IsAny<QBittorrentSettings>()), Times.Once());
+        }
+
         [Test]
         public void should_get_category_from_the_category_if_set()
         {

src/NzbDrone.Core/Download/Clients/QBittorrent/QBittorrent.cs

@@ -12,12 +12,20 @@ using FluentValidation.Results;
 using System.Net;
 using NzbDrone.Core.Parser.Model;
 using NzbDrone.Core.RemotePathMappings;
+using NzbDrone.Common.Cache;
 
 namespace NzbDrone.Core.Download.Clients.QBittorrent
 {
     public class QBittorrent : TorrentClientBase<QBittorrentSettings>
     {
         private readonly IQBittorrentProxySelector _proxySelector;
+        private readonly ICached<SeedingTimeCacheEntry> _seedingTimeCache;
+
+        private class SeedingTimeCacheEntry
+        {
+            public DateTime LastFetched { get; set; }
+            public long SeedingTime { get; set; }
+        }
 
         public QBittorrent(IQBittorrentProxySelector proxySelector,
                            ITorrentFileInfoReader torrentFileInfoReader,
@@ -25,10 +33,13 @@ namespace NzbDrone.Core.Download.Clients.QBittorrent
                            IConfigService configService,
                            IDiskProvider diskProvider,
                            IRemotePathMappingService remotePathMappingService,
+                           ICacheManager cacheManager,
                            Logger logger)
             : base(torrentFileInfoReader, httpClient, configService, diskProvider, remotePathMappingService, logger)
         {
             _proxySelector = proxySelector;
+
+            _seedingTimeCache = cacheManager.GetCache<SeedingTimeCacheEntry>(GetType(), "seedingTime");
         }
 
         private IQBittorrentProxy Proxy => _proxySelector.GetProxy(Settings);
@@ -442,23 +453,71 @@ namespace NzbDrone.Core.Download.Clients.QBittorrent
                 if (torrent.Ratio >= config.MaxRatio) return true;
             }
 
-            if (torrent.SeedingTimeLimit >= 0)
+            if (HasReachedSeedingTimeLimit(torrent, config)) return true;
-            {
+
-                if (!torrent.SeedingTime.HasValue)
+
-                {
+            return false;
-                    FetchTorrentDetails(torrent);
         }
 
-                if (torrent.SeedingTime >= torrent.SeedingTimeLimit) return true;
+        protected bool HasReachedSeedingTimeLimit(QBittorrentTorrent torrent, QBittorrentPreferences config)
+        {
+            long seedingTimeLimit;
+
+            if (torrent.SeedingTimeLimit >= 0)
+            {
+                seedingTimeLimit = torrent.SeedingTimeLimit;
             }
             else if (torrent.SeedingTimeLimit == -2 && config.MaxSeedingTimeEnabled)
             {
-                if (!torrent.SeedingTime.HasValue)
+                seedingTimeLimit = config.MaxSeedingTime;
+            }
+            else
             {
-                    FetchTorrentDetails(torrent);
+                return false;
             }
 
-                if (torrent.SeedingTime >= config.MaxSeedingTime) return true;
+            if (torrent.SeedingTime.HasValue)
+            {
+                // SeedingTime can't be available here, but use it if the api starts to provide it.
+                return torrent.SeedingTime.Value >= seedingTimeLimit;
+            }
+
+            var cacheKey = Settings.Host + Settings.Port + torrent.Hash;
+            var cacheSeedingTime = _seedingTimeCache.Find(cacheKey);
+
+            if (cacheSeedingTime != null)
+            {
+                var togo = seedingTimeLimit - cacheSeedingTime.SeedingTime;
+                var elapsed = (DateTime.UtcNow - cacheSeedingTime.LastFetched).TotalSeconds;
+
+                if (togo <= 0)
+                {
+                    // Already reached the limit, keep the cache alive
+                    _seedingTimeCache.Set(cacheKey, cacheSeedingTime, TimeSpan.FromMinutes(5));
+                    return true;
+                }
+                else if (togo > elapsed)
+                {
+                    // SeedingTime cannot have reached the required value since the last check, preserve the cache
+                    _seedingTimeCache.Set(cacheKey, cacheSeedingTime, TimeSpan.FromMinutes(5));
+                    return false;
+                }
+            }
+
+            FetchTorrentDetails(torrent);
+
+            cacheSeedingTime = new SeedingTimeCacheEntry
+            {
+                LastFetched = DateTime.UtcNow,
+                SeedingTime = torrent.SeedingTime.Value
+            };
+
+            _seedingTimeCache.Set(cacheKey, cacheSeedingTime, TimeSpan.FromMinutes(5));
+
+            if (cacheSeedingTime.SeedingTime >= seedingTimeLimit)
+            {
+                // Reached the limit, keep the cache alive
+                return true;
             }
 
             return false;