Fixed: Clean Library being to agressive when lists are having failures.

Fixes #2455

src/NzbDrone.Core/NetImport/HttpNetImportBase.cs

@@ -34,19 +34,21 @@ namespace NzbDrone.Core.NetImport
             _httpClient = httpClient;
         }
 
-        public override IList<Movie> Fetch()
+        public override NetImportFetchResult Fetch()
         {
             var generator = GetRequestGenerator();
             return FetchMovies(generator.GetMovies());
         }
 
-        protected virtual IList<Movie> FetchMovies(NetImportPageableRequestChain pageableRequestChain, bool isRecent = false)
+        protected virtual NetImportFetchResult FetchMovies(NetImportPageableRequestChain pageableRequestChain, bool isRecent = false)
         {
             var movies = new List<Movie>();
             var url = string.Empty;
 
             var parser = GetParser();
 
+            var anyFailure = false;
+
             try
             {
                 for (int i = 0; i < pageableRequestChain.Tiers; i++)
@@ -73,6 +75,7 @@ namespace NzbDrone.Core.NetImport
             }
             catch (WebException webException)
             {
+                anyFailure = true;
                 if (webException.Message.Contains("502") || webException.Message.Contains("503") ||
                     webException.Message.Contains("timed out"))
                 {
@@ -85,6 +88,7 @@ namespace NzbDrone.Core.NetImport
             }
             catch (HttpException httpException)
             {
+                anyFailure = true;
                 if ((int)httpException.Response.StatusCode == 429)
                 {
                     _logger.Warn("API Request Limit reached for {0}", this);
@@ -96,11 +100,12 @@ namespace NzbDrone.Core.NetImport
             }
             catch (Exception feedEx)
             {
+                anyFailure = true;
                 feedEx.Data.Add("FeedUrl", url);
                 _logger.Error(feedEx, "An error occurred while processing feed. " + url);
             }
 
-            return movies;
+            return new NetImportFetchResult {Movies = movies, AnyFailure = anyFailure};
         }
 
         protected virtual IList<Movie> FetchPage(NetImportRequest request, IParseNetImportResponse parser)

src/NzbDrone.Core/NetImport/INetImport.cs

@@ -9,6 +9,6 @@ namespace NzbDrone.Core.NetImport
         bool Enabled { get; }
         bool EnableAuto { get; }
 
-        IList<Movie> Fetch();
+        NetImportFetchResult Fetch();
     }
 }

src/NzbDrone.Core/NetImport/NetImportBase.cs

@@ -9,6 +9,12 @@ using NzbDrone.Core.Tv;
 
 namespace NzbDrone.Core.NetImport
 {
+    public class NetImportFetchResult
+    {
+        public IList<Movie> Movies { get; set; }
+        public bool AnyFailure { get; set; }
+    }
+    
     public abstract class NetImportBase<TSettings> : INetImport
         where TSettings : IProviderConfig, new()
     {
@@ -20,7 +26,7 @@ namespace NzbDrone.Core.NetImport
         public abstract bool Enabled { get; }
         public abstract bool EnableAuto { get; }
 
-        public abstract IList<Movie> Fetch();
+        public abstract NetImportFetchResult Fetch();
 
         public NetImportBase(IConfigService configService, IParsingService parsingService, Logger logger)
         {

src/NzbDrone.Core/NetImport/NetImportSearchService.cs

@@ -54,21 +54,22 @@ namespace NzbDrone.Core.NetImport
         }
 
 
-        public List<Movie> Fetch(int listId, bool onlyEnableAuto = false)
+        public NetImportFetchResult Fetch(int listId, bool onlyEnableAuto = false)
         {
             return MovieListSearch(listId, onlyEnableAuto);
         }
 
         public List<Movie> FetchAndFilter(int listId, bool onlyEnableAuto)
         {
-            var movies = MovieListSearch(listId, onlyEnableAuto);
+            var movies = MovieListSearch(listId, onlyEnableAuto).Movies;
 
-            return _movieService.FilterExistingMovies(movies);
+            return _movieService.FilterExistingMovies(movies.ToList());
         }
 
-        public List<Movie> MovieListSearch(int listId, bool onlyEnableAuto = false)
+        public NetImportFetchResult MovieListSearch(int listId, bool onlyEnableAuto = false)
         {
             var movies = new List<Movie>();
+            var anyFailure = false;
 
             var importLists = _netImportFactory.GetAvailableProviders();
 
@@ -81,24 +82,31 @@ namespace NzbDrone.Core.NetImport
 
             foreach (var list in lists)
             {
-                movies.AddRange(list.Fetch());
+                var result = list.Fetch();
+                movies.AddRange(result.Movies);
+                anyFailure |= result.AnyFailure;
             }
 
             _logger.Debug("Found {0} movies from list(s) {1}", movies.Count, string.Join(", ", lists.Select(l => l.Definition.Name)));
 
-			return movies.DistinctBy(x => {
-				if (x.TmdbId != 0)
-				{
-					return x.TmdbId.ToString();
-				}
+            return new NetImportFetchResult
+            {
+                Movies = movies.DistinctBy(x =>
+                {
+                    if (x.TmdbId != 0)
+                    {
+                        return x.TmdbId.ToString();
+                    }
 
-				if (x.ImdbId.IsNotNullOrWhiteSpace())
-				{
-					return x.ImdbId;
-				}
+                    if (x.ImdbId.IsNotNullOrWhiteSpace())
+                    {
+                        return x.ImdbId;
+                    }
 
-				return x.Title;
-			}).ToList();
+                    return x.Title;
+                }).ToList(),
+                AnyFailure = anyFailure
+            };
         }
 
 
@@ -112,9 +120,13 @@ namespace NzbDrone.Core.NetImport
                 return;
             }
 
-            var listedMovies = Fetch(0, true);
+            var result = Fetch(0, true);
+            var listedMovies = result.Movies.ToList();
 
-            CleanLibrary(listedMovies);
+            if (!result.AnyFailure)
+            {
+                CleanLibrary(listedMovies);
+            }
 
             listedMovies = listedMovies.Where(x => !_movieService.MovieExists(x)).ToList();
             if (listedMovies.Any())