From 94261b7669829fa964469d7964d009024355e70e Mon Sep 17 00:00:00 2001
From: Luke Pulverenti <luke.pulverenti@gmail.com>
Date: Sat, 16 Jan 2016 22:24:12 -0500
Subject: [PATCH] update episode refresh

---
 .../TV/TvdbEpisodeProvider.cs                 |  2 +
 .../TV/TvdbSeriesProvider.cs                  | 52 +++++++++++--------
 2 files changed, 33 insertions(+), 21 deletions(-)

diff --git a/MediaBrowser.Providers/TV/TvdbEpisodeProvider.cs b/MediaBrowser.Providers/TV/TvdbEpisodeProvider.cs
index 6b902ed8aa..d039207422 100644
--- a/MediaBrowser.Providers/TV/TvdbEpisodeProvider.cs
+++ b/MediaBrowser.Providers/TV/TvdbEpisodeProvider.cs
@@ -112,6 +112,8 @@ namespace MediaBrowser.Providers.TV
             if (TvdbSeriesProvider.IsValidSeries(searchInfo.SeriesProviderIds) && 
 				(searchInfo.IndexNumber.HasValue || searchInfo.PremiereDate.HasValue))
             {
+                await TvdbSeriesProvider.Current.EnsureSeriesInfo(searchInfo.SeriesProviderIds, searchInfo.MetadataLanguage, cancellationToken).ConfigureAwait(false);
+
                 var seriesDataPath = TvdbSeriesProvider.GetSeriesDataPath(_config.ApplicationPaths, searchInfo.SeriesProviderIds);
 
                 var searchNumbers = new EpisodeNumbers();
diff --git a/MediaBrowser.Providers/TV/TvdbSeriesProvider.cs b/MediaBrowser.Providers/TV/TvdbSeriesProvider.cs
index 022cf241d1..9452438cb1 100644
--- a/MediaBrowser.Providers/TV/TvdbSeriesProvider.cs
+++ b/MediaBrowser.Providers/TV/TvdbSeriesProvider.cs
@@ -329,38 +329,48 @@ namespace MediaBrowser.Providers.TV
             return false;
         }
 
+        private SemaphoreSlim _ensureSemaphore = new SemaphoreSlim(1,1);
         internal async Task<string> EnsureSeriesInfo(Dictionary<string, string> seriesProviderIds, string preferredMetadataLanguage, CancellationToken cancellationToken)
         {
-            string seriesId;
-            if (seriesProviderIds.TryGetValue(MetadataProviders.Tvdb.ToString(), out seriesId))
-            {
-                var seriesDataPath = GetSeriesDataPath(_config.ApplicationPaths, seriesProviderIds);
+            await _ensureSemaphore.WaitAsync(cancellationToken).ConfigureAwait(false);
 
-                // Only download if not already there
-                // The post-scan task will take care of updates so we don't need to re-download here
-                if (!IsCacheValid(seriesDataPath, preferredMetadataLanguage))
+            try
+            {
+                string seriesId;
+                if (seriesProviderIds.TryGetValue(MetadataProviders.Tvdb.ToString(), out seriesId))
                 {
-                    await DownloadSeriesZip(seriesId, MetadataProviders.Tvdb.ToString(), seriesDataPath, null, preferredMetadataLanguage, cancellationToken).ConfigureAwait(false);
-                }
+                    var seriesDataPath = GetSeriesDataPath(_config.ApplicationPaths, seriesProviderIds);
 
-                return seriesDataPath;
-            }
+                    // Only download if not already there
+                    // The post-scan task will take care of updates so we don't need to re-download here
+                    if (!IsCacheValid(seriesDataPath, preferredMetadataLanguage))
+                    {
+                        await DownloadSeriesZip(seriesId, MetadataProviders.Tvdb.ToString(), seriesDataPath, null, preferredMetadataLanguage, cancellationToken).ConfigureAwait(false);
+                    }
 
-            if (seriesProviderIds.TryGetValue(MetadataProviders.Imdb.ToString(), out seriesId))
-            {
-                var seriesDataPath = GetSeriesDataPath(_config.ApplicationPaths, seriesProviderIds);
+                    return seriesDataPath;
+                }
 
-                // Only download if not already there
-                // The post-scan task will take care of updates so we don't need to re-download here
-                if (!IsCacheValid(seriesDataPath, preferredMetadataLanguage))
+                if (seriesProviderIds.TryGetValue(MetadataProviders.Imdb.ToString(), out seriesId))
                 {
-                    await DownloadSeriesZip(seriesId, MetadataProviders.Imdb.ToString(), seriesDataPath, null, preferredMetadataLanguage, cancellationToken).ConfigureAwait(false);
+                    var seriesDataPath = GetSeriesDataPath(_config.ApplicationPaths, seriesProviderIds);
+
+                    // Only download if not already there
+                    // The post-scan task will take care of updates so we don't need to re-download here
+                    if (!IsCacheValid(seriesDataPath, preferredMetadataLanguage))
+                    {
+                        await DownloadSeriesZip(seriesId, MetadataProviders.Imdb.ToString(), seriesDataPath, null, preferredMetadataLanguage, cancellationToken).ConfigureAwait(false);
+                    }
+
+                    return seriesDataPath;
                 }
 
-                return seriesDataPath;
+                return null;
+            }
+            finally
+            {
+                _ensureSemaphore.Release();
             }
-
-            return null;
         }
 
         private bool IsCacheValid(string seriesDataPath, string preferredMetadataLanguage)