beremiz

Dirty fix for error '_object_has_no_attribute_'getSlave' in EtherCAT extension

2018-08-10, Andrey Skvortsov
a3ac46366b86
Dirty 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():
:_'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


this is looks like dirty hack to fix strange problem with initial[0]
changing its type after returning from _init_ method to lxml.etree._Element
As a result all methods generated by class factory are lost.

For example, in function initMethod initial[0].__class__ points to
xmlclass.xmlclass.Config. After map(self.append, initial)
self.Config.__class__ is 'xmlclass.xmlclass.Config' as well.
But after returning from initMethod (_init) in CreateElement
self.Config.__class__ has changed to lxml.etree._Element.


I've noticed similar behavior if copy/deepcopy is used for any child
of etree.ElementBase. See simple example below.
[-------------------------------------------------------------]
#!/usr/bin/python

from __future__ import print_function
from lxml import etree
import copy

class DefaultElementClass(etree.ElementBase):
def getLocalTag(self):
return etree.QName(self.tag).localname


def printInformation(x):
print(x, x.__class__, "getLocalTag" in dir(x))


a = DefaultElementClass()
printInformation(a)

#
printInformation(copy.copy(a))
printInformation(copy.deepcopy(a))
[-------------------------------------------------------------]
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright (C) 2018: Smarteh
#
# See COPYING file for copyrights details.
from __future__ import absolute_import
from __future__ import print_function
import wx
from zope.interface import implementer
from controls.UriLocationEditor import IConnectorPanel
URITypes = ["LOCAL", "PYRO", "PYROS"]
def PYRO_connector_dialog(confnodesroot):
[ID_IPTEXT, ID_PORTTEXT] = [wx.NewId() for _init_ctrls in range(2)]
@implementer(IConnectorPanel)
class PYROConnectorPanel(wx.Panel):
def __init__(self, typeConnector, parrent, *args, **kwargs):
self.type = typeConnector
self.parrent = parrent
wx.Panel.__init__(self, parrent, *args, **kwargs)
self._init_ctrls()
self._init_sizers()
self.uri = None
def _init_ctrls(self):
self.IpText = wx.TextCtrl(parent=self, id=ID_IPTEXT, size=wx.Size(200, -1))
self.PortText = wx.TextCtrl(parent=self, id=ID_PORTTEXT, size=wx.Size(200, -1))
def _init_sizers(self):
self.mainSizer = wx.FlexGridSizer(cols=2, hgap=10, rows=5, vgap=10)
self.mainSizer.AddWindow(wx.StaticText(self, label=_("URI host:")),
flag=wx.ALIGN_CENTER_VERTICAL)
self.mainSizer.AddWindow(self.IpText, flag=wx.GROW)
self.mainSizer.AddWindow(wx.StaticText(self, label=_("URI port:")),
flag=wx.ALIGN_CENTER_VERTICAL)
self.mainSizer.AddWindow(self.PortText, flag=wx.GROW)
self.SetSizer(self.mainSizer)
def SetURI(self, uri):
self.uri = uri
uri_list = uri.strip().split(":")
length = len(uri_list)
if length == 3:
self.IpText.SetValue(uri_list[1].strip("/"))
self.PortText.SetValue(uri_list[2])
elif length == 2:
self.IpText.SetValue(uri_list[1].strip("/"))
def GetURI(self):
self.uri = self.type+"://"+self.IpText.GetValue()+":"+self.PortText.GetValue()
return self.uri
return PYROConnectorPanel("PYRO", confnodesroot)