plcopen/InstanceTagnameCollector.py
author Andrey Skvortsov <andrej.skvortzov@gmail.com>
Fri, 24 Aug 2018 13:41:43 +0300
changeset 2297 96ca6b056c55
parent 1953 5736d25bb393
child 3750 f62625418bff
permissions -rw-r--r--
Proper fix for error 'object has no attribute 'getSlave' in EtherCAT extension

traceback:
File "/home/developer/WorkData/PLC/beremiz/beremiz/IDEFrame.py", line 1433, in OnPouSelectedChanged
window.RefreshView()
File "/home/developer/WorkData/PLC/beremiz/beremiz/etherlab/ConfigEditor.py", line 837, in RefreshView
self.RefreshProcessVariables()
File "/home/developer/WorkData/PLC/beremiz/beremiz/etherlab/ConfigEditor.py", line 886, in RefreshProcessVariables
slaves = self.Controler.GetSlaves(**self.CurrentNodesFilter)
File "/home/developer/WorkData/PLC/beremiz/beremiz/etherlab/EthercatMaster.py", line 341, in GetSlaves
for slave in self.Config.getConfig().getSlave():
<type 'exceptions.AttributeError'>:_'lxml.etree._Element'_object_has_no_attribute_'getSlave'

Steps to reproduce problem:

- Add new EtherCAT master
- Add new EthercatNode to the master
- double click on


Revert commit "Dirty fix for error '_object_has_no_attribute_'getSlave' in EtherCAT extension"
[a3ac46366b86a0b237dac93be6b2281ac70b98a8].

The problem was that XML elements (proxy object) in some cases were created using custom XML
classes constructors and lxml.etree.Element() call and live python
patching. This causes that lxml backend doesn't know that custom python class
should be used for these XML elements.
Proxy object can be move/deleted and recreated by lxml
backend at any point in time or this can be done in python by copy/deepcopy operations.
If this happens, then newly created
proxy elements are using default class lxml.etree._Element. And all
custom functionality is lost.

All created XML elements should be always created through corresponding
parser and class lookup callback done by lxml backend.
It's described in more details in lxml documentation:
https://lxml.de/element_classes.html
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# This file is part of Beremiz.
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# See COPYING file for copyrights details.
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from __future__ import absolute_import
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from plcopen.XSLTModelQuery import XSLTModelQuery
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from plcopen.types_enums import *
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class InstanceTagName(object):
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    """Helpers object for generating instance tagname"""
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    def __init__(self):
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        self.TagName = None
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    def GetTagName(self):
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        return self.TagName
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    def ConfigTagName(self, context, *args):
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        self.TagName = ComputeConfigurationName(args[0][0])
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    def ResourceTagName(self, context, *args):
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        self.TagName = ComputeConfigurationResourceName(args[0][0], args[1][0])
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    def PouTagName(self, context, *args):
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        self.TagName = ComputePouName(args[0][0])
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    def ActionTagName(self, context, *args):
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        self.TagName = ComputePouActionName(args[0][0], args[0][1])
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    def TransitionTagName(self, context, *args):
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        self.TagName = ComputePouTransitionName(args[0][0], args[0][1])
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class InstanceTagnameCollector(XSLTModelQuery):
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    """ object for collecting instances path list"""
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    def __init__(self, controller):
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        XSLTModelQuery.__init__(self,
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                                controller,
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                                "instance_tagname.xslt",
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                                [(name, self.FactoryCaller(name))
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                                 for name in ["ConfigTagName",
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                                              "ResourceTagName",
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                                              "PouTagName",
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                                              "ActionTagName",
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                                              "TransitionTagName"]])
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    def FactoryCaller(self, funcname):
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        def CallFactory(*args):
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            return getattr(self.factory, funcname)(*args)
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        return CallFactory
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    def Collect(self, root, debug, instance_path):
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        self.factory = InstanceTagName()
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        self._process_xslt(root, debug, instance_path=instance_path)
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        res = self.factory.GetTagName()
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        self.factory = None
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        return res