New: List Status Checks/Backoffs

src/NzbDrone.Core/HealthCheck/Checks/NetImportStatusCheck.cs

@@ -0,0 +1,44 @@
+using System.Linq;
+using NzbDrone.Common.Extensions;
+using NzbDrone.Core.NetImport;
+using NzbDrone.Core.ThingiProvider.Events;
+
+namespace NzbDrone.Core.HealthCheck.Checks
+{
+    [CheckOn(typeof(ProviderUpdatedEvent<INetImport>))]
+    [CheckOn(typeof(ProviderDeletedEvent<INetImport>))]
+    [CheckOn(typeof(ProviderStatusChangedEvent<INetImport>))]
+    public class NetImportStatusCheck : HealthCheckBase
+    {
+        private readonly INetImportFactory _providerFactory;
+        private readonly INetImportStatusService _providerStatusService;
+
+        public NetImportStatusCheck(INetImportFactory providerFactory, INetImportStatusService providerStatusService)
+        {
+            _providerFactory = providerFactory;
+            _providerStatusService = providerStatusService;
+        }
+
+        public override HealthCheck Check()
+        {
+            var enabledProviders = _providerFactory.GetAvailableProviders();
+            var backOffProviders = enabledProviders.Join(_providerStatusService.GetBlockedProviders(),
+                    i => i.Definition.Id,
+                    s => s.ProviderId,
+                    (i, s) => new { Provider = i, Status = s })
+                .ToList();
+
+            if (backOffProviders.Empty())
+            {
+                return new HealthCheck(GetType());
+            }
+
+            if (backOffProviders.Count == enabledProviders.Count)
+            {
+                return new HealthCheck(GetType(), HealthCheckResult.Error, "All lists are unavailable due to failures", "#lists-are-unavailable-due-to-failures");
+            }
+
+            return new HealthCheck(GetType(), HealthCheckResult.Warning, string.Format("Lists unavailable due to failures: {0}", string.Join(", ", backOffProviders.Select(v => v.Provider.Definition.Name))), "#lists-are-unavailable-due-to-failures");
+        }
+    }
+}