New: Option to send notification when a Health Check warning occurs

closes #3253

src/NzbDrone.Core/Notifications/NotificationService.cs

@@ -4,6 +4,7 @@ using System.Linq;
 using NLog;
 using NzbDrone.Common.Extensions;
 using NzbDrone.Core.Download;
+using NzbDrone.Core.HealthCheck;
 using NzbDrone.Core.MediaFiles.Events;
 using NzbDrone.Core.Messaging.Events;
 using NzbDrone.Core.Qualities;
@@ -15,7 +16,8 @@ namespace NzbDrone.Core.Notifications
     public class NotificationService
         : IHandle<EpisodeGrabbedEvent>,
           IHandle<EpisodeImportedEvent>,
-          IHandle<SeriesRenamedEvent>
+          IHandle<SeriesRenamedEvent>,
+          IHandle<HealthCheckFailedEvent>
     {
         private readonly INotificationFactory _notificationFactory;
         private readonly Logger _logger;
@@ -85,6 +87,21 @@ namespace NzbDrone.Core.Notifications
             return false;
         }
 
+        private bool ShouldHandleHealthFailure(HealthCheck.HealthCheck healthCheck, bool includeWarnings)
+        {
+            if (healthCheck.Type == HealthCheckResult.Error)
+            {
+                return true;
+            }
+
+            if (healthCheck.Type == HealthCheckResult.Warning && includeWarnings)
+            {
+                return true;
+            }
+
+            return false;
+        }
+
         public void Handle(EpisodeGrabbedEvent message)
         {
             var grabMessage = new GrabMessage
@@ -168,5 +185,24 @@ namespace NzbDrone.Core.Notifications
                 }
             }
         }
+
+        public void Handle(HealthCheckFailedEvent message)
+        {
+            foreach (var notification in _notificationFactory.OnHealthIssueEnabled())
+            {
+                try
+                {
+                    if (ShouldHandleHealthFailure(message.HealthCheck, ((NotificationDefinition)notification.Definition).IncludeHealthWarnings))
+                    {
+                        notification.OnHealthIssue(message.HealthCheck);
+                    }
+                }
+
+                catch (Exception ex)
+                {
+                    _logger.Warn(ex, "Unable to send OnHealthIssue notification to: " + notification.Definition.Name);
+                }
+            }
+        }
     }
 }