Fix: Added Request Wrapper to prevent SPARQL Timeouts

src/GraphDeployer/GraphDeployer.csproj

@@ -27,6 +27,7 @@
 		<PackageReference Include="LibGit2Sharp" Version="0.26.2" />
 		<PackageReference Include="NLog" Version="5.1.0" />
 		<PackageReference Include="NLog.Extensions.Logging" Version="5.2.0" />
+		<PackageReference Include="Polly.Extensions.Http" Version="3.0.0" />
 	</ItemGroup>
 
 	<ItemGroup>

src/GraphDeployer/Helpers.cs

+using Polly;
+
+namespace Coscine.GraphDeployer;
+
+public static class Helpers
+{
+    /// <summary>
+    /// Retry Virtuoso Requests since they sometimes just fail
+    /// </summary>
+    /// <typeparam name="W"></typeparam>
+    /// <param name="function"></param>
+    /// <returns></returns>
+    public static void WrapRequest(Action action)
+    {
+        Policy
+            .Handle<Exception>()
+            .WaitAndRetry(5, retryNumber => TimeSpan.FromMilliseconds(200))
+            .Execute(() => action.Invoke());
+    }
+
+    /// <summary>
+    /// Retry Virtuoso Requests since they sometimes just fail
+    /// </summary>
+    /// <typeparam name="W"></typeparam>
+    /// <param name="function"></param>
+    /// <returns></returns>
+    public static W WrapRequest<W>(Func<W> function)
+    {
+        return Policy
+            .Handle<Exception>()
+            .WaitAndRetry(5, retryNumber => TimeSpan.FromMilliseconds(200))
+            .ExecuteAndCapture(() => function.Invoke()).Result;
+    }
+
+}

src/GraphDeployer/Program.cs

@@ -112,7 +112,7 @@ public class Program
                     var graph = kv.Value.Item1;
                     var graphName = kv.Key.ToString();
 
-                    var currentGraph = _rdfStoreConnector.GetGraph(graphName);
+                    var currentGraph = Helpers.WrapRequest(() => _rdfStoreConnector.GetGraph(graphName));
 
                     var graphWasChanged = graph.Triples.Count != currentGraph.Triples.Count
                         || graph.Triples.Any((triple) => !currentGraph.Triples.Any((currentTriple) =>
@@ -124,7 +124,7 @@ public class Program
                     {
                         if (!currentGraph.IsEmpty)
                         {
-                            _rdfStoreConnector.ClearGraph(graphName);
+                            Helpers.WrapRequest(() => _rdfStoreConnector.ClearGraph(graphName));
                             _logger.LogInformation("Cleared Graph {graphName}", graphName);
                         }
                         else