implement browse_next in client (#386)

* implement browse_next in client

* first attempt to decode custom extension objects, broken!

* fix several small errors

* add 0 as default for max nodes in browse, cleanup

Author: oroulet

opcua/client/ua_client.py

@@ -276,6 +276,16 @@ def browse(self, parameters):
         response.ResponseHeader.ServiceResult.check()
         return response.Results
 
+    def browse_next(self, parameters):
+        self.logger.info("browse next")
+        request = ua.BrowseNextRequest()
+        request.Parameters = parameters
+        data = self._uasocket.send_request(request)
+        response = ua.BrowseNextResponse.from_binary(data)
+        self.logger.debug(response)
+        response.ResponseHeader.ServiceResult.check()
+        return response.Parameters.Results
+
     def read(self, parameters):
         self.logger.info("read")
         request = ua.ReadRequest()

opcua/common/node.py

@@ -328,8 +328,21 @@ def get_references(self, refs=ua.ObjectIds.References, direction=ua.BrowseDirect
         params = ua.BrowseParameters()
         params.View.Timestamp = ua.get_win_epoch()
         params.NodesToBrowse.append(desc)
+        params.RequestedMaxReferencesPerNode = 0
         results = self.server.browse(params)
-        return results[0].References
+
+        references = self._browse_next(results)
+        return references
+
+    def _browse_next(self, results):
+        references = results[0].References
+        while results[0].ContinuationPoint:
+            params = ua.BrowseNextParameters()
+            params.ContinuationPoints = [results[0].ContinuationPoint]
+            params.ReleaseContinuationPoints = False
+            results = self.server.browse_next(params)
+            references.extend(results[0].References)
+        return references
 
     def get_referenced_nodes(self, refs=ua.ObjectIds.References, direction=ua.BrowseDirection.Both, nodeclassmask=ua.NodeClass.Unspecified, includesubtypes=True):
         """

schemas/generate_model.py

@@ -498,6 +498,12 @@ def add_basetype_members(model):
             struct.fields.insert(idx, field)
 
 
+def fix_names(model):
+    for s in model.enums:
+        for f in s.values:
+            if f.name == "None":
+                f.name = "None_"
+
 
 
 

schemas/generate_protocol_python.py

@@ -1,5 +1,3 @@
-# temporary hack
-import generate_model as gm
 
 IgnoredEnums = ["NodeIdType"]
 IgnoredStructs = ["QualifiedName", "NodeId", "ExpandedNodeId", "FilterOperand", "Variant", "DataValue", "LocalizedText", "ExtensionObject", "XmlElement"]
@@ -351,15 +349,8 @@ def get_default_value(self, field):
         else:
             return field.uatype + "()"
 
-
-def fix_names(model):
-    for s in model.enums:
-        for f in s.values:
-            if f.name == "None":
-                f.name = "None_"
-
-
 if __name__ == "__main__":
+    import generate_model as gm
     xmlpath = "Opc.Ua.Types.bsd"
     protocolpath = "../opcua/ua/uaprotocol_auto.py"
     p = gm.Parser(xmlpath)
@@ -369,6 +360,6 @@ def fix_names(model):
     gm.remove_duplicates(model)
     gm.remove_vector_length(model)
     gm.split_requests(model)
-    fix_names(model)
+    gm.fix_names(model)
     c = CodeGenerator(model, protocolpath)
     c.run()