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 -*-
# This file is part of Beremiz, a Integrated Development Environment for
# programming IEC 61131-3 automates supporting plcopen standard and CanFestival.
#
# Copyright (C) 2012: Edouard TISSERANT and Laurent BESSARD
# Copyright (C) 2017: Andrey Skvortsov <andrej.skvortzov@gmail.com>
#
# See COPYING file for copyrights details.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
from __future__ import absolute_import
import wx
from controls.ProjectPropertiesPanel import ProjectPropertiesPanel
class ProjectDialog(wx.Dialog):
def __init__(self, parent, enable_required=True):
wx.Dialog.__init__(self, parent, title=_('Project properties'),
style=wx.DEFAULT_DIALOG_STYLE)
main_sizer = wx.FlexGridSizer(cols=1, hgap=0, rows=2, vgap=10)
main_sizer.AddGrowableCol(0)
main_sizer.AddGrowableRow(0)
self.ProjectProperties = ProjectPropertiesPanel(
self, enable_required=enable_required, scrolling=False)
main_sizer.AddWindow(self.ProjectProperties, flag=wx.GROW)
self.ButtonSizer = self.CreateButtonSizer(wx.OK | wx.CANCEL | wx.CENTRE)
self.Bind(wx.EVT_BUTTON, self.OnOK,
self.ButtonSizer.GetAffirmativeButton())
main_sizer.AddSizer(self.ButtonSizer, border=20,
flag=wx.ALIGN_RIGHT | wx.BOTTOM | wx.LEFT | wx.RIGHT)
self.SetSizer(main_sizer)
self.ProjectProperties.Fit()
self.Fit()
def OnOK(self, event):
values = self.ProjectProperties.GetValues()
error = []
for param, name in [("projectName", _("Project Name")),
("productName", _("Product Name")),
("productVersion", _("Product Version")),
("companyName", _("Company Name"))]:
if values[param] == "":
error.append(name)
if len(error) > 0:
text = ""
for i, item in enumerate(error):
if i == 0:
text += item
elif i == len(error) - 1:
text += _(" and %s") % item
else:
text += ", %s" % item
dialog = wx.MessageDialog(
self,
_("Form isn't complete. %s must be filled!") % text,
_("Error"), wx.OK | wx.ICON_ERROR)
dialog.ShowModal()
dialog.Destroy()
else:
self.EndModal(wx.ID_OK)
def SetValues(self, values):
self.ProjectProperties.SetValues(values)
def GetValues(self):
return self.ProjectProperties.GetValues()