Fixed: Failing Newznab capabilities request should trigger automatic indexer backoff logic.

src/NzbDrone.Core.Test/IndexerTests/NewznabTests/NewznabFixture.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Linq;
+using System.Net;
 using FluentAssertions;
 using Moq;
 using NUnit.Framework;
@@ -7,6 +8,7 @@ using NzbDrone.Common.Http;
 using NzbDrone.Core.Indexers;
 using NzbDrone.Core.Indexers.Newznab;
 using NzbDrone.Core.Test.Framework;
+using NzbDrone.Test.Common;
 
 namespace NzbDrone.Core.Test.IndexerTests.NewznabTests
 {
@@ -69,5 +71,27 @@ namespace NzbDrone.Core.Test.IndexerTests.NewznabTests
 
             Subject.PageSize.Should().Be(25);
         }
+
+        [Test]
+        public void should_record_indexer_failure_if_caps_throw()
+        {
+            var request = new HttpRequest("http://my.indexer.com");
+            var response = new HttpResponse(request, new HttpHeader(), new byte[0], (HttpStatusCode)429);
+            response.Headers["Retry-After"] = "300";
+
+            Mocker.GetMock<INewznabCapabilitiesProvider>()
+                .Setup(v => v.GetCapabilities(It.IsAny<NewznabSettings>()))
+                .Throws(new TooManyRequestsException(request, response));
+
+            _caps.MaxPageSize = 30;
+            _caps.DefaultPageSize = 25;
+
+            Subject.FetchRecent().Should().BeEmpty();
+
+            Mocker.GetMock<IIndexerStatusService>()
+                  .Verify(v => v.RecordFailure(It.IsAny<int>(), TimeSpan.FromMinutes(5.0)), Times.Once());
+
+            ExceptionVerification.ExpectedWarns(1);
+        }
     }
 }

src/NzbDrone.Core/Indexers/HttpIndexerBase.cs

@@ -46,9 +46,7 @@ namespace NzbDrone.Core.Indexers
                 return new List<ReleaseInfo>();
             }
 
-            var generator = GetRequestGenerator();
-
-            return FetchReleases(generator.GetRecentRequests(), true);
+            return FetchReleases(g => g.GetRecentRequests(), true);
         }
 
         public override IList<ReleaseInfo> Fetch(SingleEpisodeSearchCriteria searchCriteria)
@@ -58,9 +56,7 @@ namespace NzbDrone.Core.Indexers
                 return new List<ReleaseInfo>();
             }
 
-            var generator = GetRequestGenerator();
-
-            return FetchReleases(generator.GetSearchRequests(searchCriteria));
+            return FetchReleases(g => g.GetSearchRequests(searchCriteria));
         }
 
         public override IList<ReleaseInfo> Fetch(SeasonSearchCriteria searchCriteria)
@@ -70,9 +66,7 @@ namespace NzbDrone.Core.Indexers
                 return new List<ReleaseInfo>();
             }
 
-            var generator = GetRequestGenerator();
-
-            return FetchReleases(generator.GetSearchRequests(searchCriteria));
+            return FetchReleases(g => g.GetSearchRequests(searchCriteria));
         }
 
         public override IList<ReleaseInfo> Fetch(DailyEpisodeSearchCriteria searchCriteria)
@@ -82,9 +76,7 @@ namespace NzbDrone.Core.Indexers
                 return new List<ReleaseInfo>();
             }
 
-            var generator = GetRequestGenerator();
-
-            return FetchReleases(generator.GetSearchRequests(searchCriteria));
+            return FetchReleases(g => g.GetSearchRequests(searchCriteria));
         }
 
         public override IList<ReleaseInfo> Fetch(AnimeEpisodeSearchCriteria searchCriteria)
@@ -94,9 +86,7 @@ namespace NzbDrone.Core.Indexers
                 return new List<ReleaseInfo>();
             }
 
-            var generator = GetRequestGenerator();
-
-            return FetchReleases(generator.GetSearchRequests(searchCriteria));
+            return FetchReleases(g => g.GetSearchRequests(searchCriteria));
         }
 
         public override IList<ReleaseInfo> Fetch(SpecialEpisodeSearchCriteria searchCriteria)
@@ -106,20 +96,21 @@ namespace NzbDrone.Core.Indexers
                 return new List<ReleaseInfo>();
             }
 
-            var generator = GetRequestGenerator();
-
-            return FetchReleases(generator.GetSearchRequests(searchCriteria));
+            return FetchReleases(g => g.GetSearchRequests(searchCriteria));
         }
 
-        protected virtual IList<ReleaseInfo> FetchReleases(IndexerPageableRequestChain pageableRequestChain, bool isRecent = false)
+        protected virtual IList<ReleaseInfo> FetchReleases(Func<IIndexerRequestGenerator, IndexerPageableRequestChain> pageableRequestChainSelector, bool isRecent = false)
         {
             var releases = new List<ReleaseInfo>();
             var url = string.Empty;
 
-            var parser = GetParser();
-
             try
             {
+                var generator = GetRequestGenerator();
+                var parser = GetParser();
+
+                var pageableRequestChain = pageableRequestChainSelector(generator);
+
                 var fullyUpdated = false;
                 ReleaseInfo lastReleaseInfo = null;
                 if (isRecent)
@@ -222,18 +213,22 @@ namespace NzbDrone.Core.Indexers
                     _logger.Warn("{0} {1} {2}", this, url, webException.Message);
                 }
             }
-            catch (HttpException httpException)
+            catch (TooManyRequestsException ex)
             {
-                if ((int)httpException.Response.StatusCode == 429)
+                if (ex.RetryAfter != TimeSpan.Zero)
                 {
-                    _indexerStatusService.RecordFailure(Definition.Id, TimeSpan.FromHours(1));
-                    _logger.Warn("API Request Limit reached for {0}", this);
+                    _indexerStatusService.RecordFailure(Definition.Id, ex.RetryAfter);
                 }
                 else
                 {
-                    _indexerStatusService.RecordFailure(Definition.Id);
-                    _logger.Warn("{0} {1}", this, httpException.Message);
+                    _indexerStatusService.RecordFailure(Definition.Id, TimeSpan.FromHours(1));
                 }
+                _logger.Warn("API Request Limit reached for {0}", this);
+            }
+            catch (HttpException ex)
+            {
+                _indexerStatusService.RecordFailure(Definition.Id);
+                _logger.Warn("{0} {1}", this, ex.Message);
             }
             catch (RequestLimitReachedException)
             {