Fix: error on gxmulticall service that was not working for declarative REST services. (#1097)

* Fix: error on gxmulticall service that was not working for declarative REST services.

* Add CreateWorkerInstance to encapsulate service creation logic.
Use the .svc file to determine the correct service name (when procedure is main it has the A prefix).

Author: claudiamurialdo

dotnet/src/dotnetframework/GxClasses/Middleware/GXHttpServices.cs

@@ -60,6 +60,7 @@ public override void webExecute()
 		{
 #if NETCORE
 			GxRestWrapper handler = null;
+			GXBaseObject worker = null;
 #else
 			Utils.GxRestService handler = null;
 #endif
@@ -77,25 +78,35 @@ public override void webExecute()
 						parmsColl.FromJSonString(jsonStr);
 					}
 				}
-#if NETCORE
-
-				handler = GetRouting().GetController(context.HttpContext, new ControllerInfo() { Name = gxobj.Replace('.',Path.DirectorySeparatorChar)});
-				if (handler ==null) {
-					throw new GxClassLoaderException($"{gxobj} not found");
-				}
-#else
+				string servicesType = gxobj + "_services";
 				string nspace;
 				if (!Config.GetValueOf("AppMainNamespace", out nspace))
 					nspace = "GeneXus.Programs";
-				handler = (GxRestService)ClassLoader.FindInstance(gxobj, nspace, gxobj + "_services", null, null);
-#endif
-				handler.RunAsMain = false;
-
 #if NETCORE
-				GXBaseObject worker = handler.Worker;
+				if (RestAPIHelpers.ServiceAsController())
+				{
+					worker = CreateWorkerInstance(nspace, gxobj);
+					if (worker == null)
+					{
+						throw new GxClassLoaderException($"{gxobj} not found");
+					}
+				}
+				else
+				{
+					handler = GetRouting().GetController(context.HttpContext, new ControllerInfo() { Name = gxobj.Replace('.', Path.DirectorySeparatorChar) });
+					if (handler == null)
+					{
+						throw new GxClassLoaderException($"{gxobj} not found");
+					}
+					worker = handler.Worker;
+					worker.IsMain = false;
+				}
 #else
+				handler = (GxRestService)ClassLoader.FindInstance(gxobj, nspace, servicesType, null, null);
+				handler.RunAsMain = false;
 				GxRestService worker = handler;
 #endif
+
 				ParameterInfo[] pars = worker.GetType().GetMethod(EXECUTE_METHOD).GetParameters();
 
 				int ParmsCount = pars.Length;
@@ -126,13 +137,46 @@ public override void webExecute()
 			}
 			finally
 			{
+#if NETCORE
+				if (worker != null)
+				{
+					worker.IsMain = true;
+					worker.cleanup();
+				}
+#else
 				if (handler != null)
 				{
 					handler.RunAsMain = true;
 					handler.Cleanup();
 				}
+#endif
+			}
+		}
+#if NETCORE
+		const string SERVICES_SUFFIX = "_services";
+
+		internal static GXBaseObject CreateWorkerInstance(string nspace, string gxobj)
+		{
+			string svcFile = new FileInfo(Path.Combine(GXRouting.ContentRootPath, $"{gxobj}.svc")).FullName;
+			if (File.Exists(svcFile))
+			{
+
+				string[] serviceAssemblyQualifiedName = new string(File.ReadLines(svcFile).First().SkipWhile(c => c != '"')
+						   .Skip(1)
+						   .TakeWhile(c => c != '"')
+						   .ToArray()).Trim().Split(',');
+				string serviceAssemblyName = serviceAssemblyQualifiedName.Last();
+				string serviceClassName = serviceAssemblyQualifiedName.First();
+				if (!string.IsNullOrEmpty(nspace) && serviceClassName.StartsWith(nspace))
+					serviceClassName = serviceClassName.Substring(nspace.Length + 1);
+				else
+					nspace = string.Empty;
+				string workerClassName = serviceClassName.Substring(0, serviceClassName.Length - SERVICES_SUFFIX.Length);
+				return (GXBaseObject)ClassLoader.FindInstance(serviceAssemblyName, nspace, workerClassName, null, null);
 			}
+			return null;
 		}
+#endif
 
 	}