Added support for single node and list of nodes.

Signed-off-by: Cristiano Urban <cristiano.urban@inaf.it>

transfer_service/retrieve_preprocessor.py

@@ -18,12 +18,15 @@ class RetrievePreprocessor(TaskExecutor):
         super(RetrievePreprocessor, self).__init__()
         
     def execute(self):
+        nodeType = self.jobObj.jobInfo["transfer"]["protocols"][0]["param"][0]["value"]
         vospacePath = self.jobObj.jobInfo["transfer"]["target"].split("!vospace")[1]
+        if nodeType == "single":                    
+            self.nodeList.append(vospacePath)
+        else:
             self.dbConn.connect()
-        osPath = self.dbConn.getOSPath(vospacePath)
+            self.nodeList = self.dbConn.getVOSpacePathList(vospacePath)
             self.dbConn.disconnect()
-        self.nodeList.append(osPath)
-        self.jobObj.jobInfo["transfer"]["nodeList"] = self.nodeList
+        self.jobObj.jobInfo["nodeList"] = self.nodeList        
 
     def run(self):
         print("Starting retrieve preprocessor...")