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) 2017: Andrey Skvortsov
#
# 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 unittest
import time
import wx
import conftest
import controls.CustomIntCtrl
class TestCustomIntCtrl(unittest.TestCase):
def setUp(self):
self.app = wx.App()
self.frame = wx.Frame(None)
def tearDown(self):
self.frame.Destroy()
wx.CallAfter(self.app.Exit)
self.app.MainLoop()
def testMaxLimit(self):
"""Test working upper bound"""
self.AddControls()
self.int_ctrl.SetValue(self.max_val + 100)
self.ProcessEvents()
self.txt_ctrl.SetFocus()
self.ProcessEvents()
self.assertEqual(self.int_ctrl.GetValue(), self.max_val)
def testMinLimit(self):
"""Test working lower bound"""
self.AddControls()
self.int_ctrl.SetValue(self.min_val - 100)
self.ProcessEvents()
self.txt_ctrl.SetFocus()
self.ProcessEvents()
self.assertEqual(self.int_ctrl.GetValue(), self.min_val)
def testCorrectValue(self):
"""Test case if no limiting is necessary"""
self.AddControls()
val = (self.max_val + self.min_val) / 2
self.int_ctrl.SetValue(val)
self.ProcessEvents()
self.txt_ctrl.SetFocus()
self.ProcessEvents()
self.assertEqual(self.int_ctrl.GetValue(), val)
def testEventBinding(self):
"""Test event sending after edit and bound checks are done"""
self.AddControls()
self.event_happend = False
def EventHandler(event):
self.event_happend = True
event.Skip()
self.int_ctrl.Bind(controls.CustomIntCtrl.EVT_CUSTOM_INT, EventHandler)
val = (self.max_val + self.min_val) / 2
self.int_ctrl.SetValue(val)
self.ProcessEvents()
self.txt_ctrl.SetFocus()
self.ProcessEvents()
self.txt_ctrl.SetFocus()
self.ProcessEvents()
self.assertEqual(self.int_ctrl.GetValue(), val)
self.assertTrue(self.event_happend)
def testLongNumbers(self):
"""Test support of long integer"""
self.AddControls()
val = 40000000000
self.int_ctrl.SetMax(val)
self.int_ctrl.SetValue(val)
self.ProcessEvents()
self.txt_ctrl.SetFocus()
self.ProcessEvents()
self.assertEqual(val, val)
def ProcessEvents(self):
for dummy in range(0, 10):
wx.Yield()
time.sleep(0.01)
def AddControls(self):
vs = wx.BoxSizer(wx.VERTICAL)
self.int_ctrl = controls.CustomIntCtrl(self.frame)
self.txt_ctrl = wx.TextCtrl(self.frame)
vs.Add(self.int_ctrl, 0, wx.ALIGN_CENTRE | wx.ALL, 5)
vs.Add(self.txt_ctrl, 0, wx.ALIGN_CENTRE | wx.ALL, 5)
self.frame.SetSizer(vs)
vs.Fit(self.frame)
self.frame.Show()
self.frame.Raise()
self.min_val = 50
self.max_val = 100
self.int_ctrl.SetBounds(self.min_val, self.max_val)
self.ProcessEvents()
if __name__ == '__main__':
conftest.init_environment()
unittest.main()