Limit TMDb requests when importing via IMDBid (#703)

src/NzbDrone.Core/MetadataSource/SkyHook/SkyHookProxy.cs

@@ -232,7 +232,19 @@ namespace NzbDrone.Core.MetadataSource.SkyHook
             request.AllowAutoRedirect = true;
             request.SuppressHttpError = true;
 
-            var resources = _httpClient.Get<FindRoot>(request).Resource;
+            var response = _httpClient.Get<FindRoot>(request);
+
+            // The dude abides, so should us, Lets be nice to TMDb
+            // var allowed = int.Parse(response.Headers.GetValues("X-RateLimit-Limit").First()); // get allowed
+            // var reset = long.Parse(response.Headers.GetValues("X-RateLimit-Reset").First()); // get time when it resets
+            var remaining = int.Parse(response.Headers.GetValues("X-RateLimit-Remaining").First());
+            if (remaining <= 5)
+            {
+                _logger.Trace("Waiting 5 seconds to get information for the next 35 movies");
+                Thread.Sleep(5000);
+            }
+
+            var resources = response.Resource;
 
             return resources.movie_results.SelectList(MapMovie).FirstOrDefault();
         }