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))
[-------------------------------------------------------------]
from __future__ import absolute_import
import wx
from zope.interface import Interface, Attribute
from zope.interface.verify import verifyObject
from connectors import connectors_dialog, ConnectorDialog, GetConnectorFromURI
[ID_URIWIZARDDIALOG, ID_URITYPECHOICE] = [wx.NewId() for _init_ctrls in range(2)]
class IConnectorPanel(Interface):
"""This is interface for panel of seperate connector type"""
uri = Attribute("""uri of connections""")
type = Attribute("""type of connector""")
def SetURI(uri): # pylint: disable=no-self-argument
"""methode for set uri"""
def GetURI(): # pylint: disable=no-self-argument
"""metohde for get uri"""
class UriLocationEditor(wx.Dialog):
def _init_ctrls(self, parent):
self.UriTypeChoice = wx.Choice(parent=self, id=ID_URIWIZARDDIALOG, choices=self.URITYPES)
self.UriTypeChoice.SetSelection(0)
self.Bind(wx.EVT_CHOICE, self.OnTypeChoice, self.UriTypeChoice)
self.PanelSizer = wx.BoxSizer(wx.HORIZONTAL)
self.ButtonSizer = self.CreateButtonSizer(wx.OK | wx.CANCEL)
def _init_sizers(self):
self.mainSizer = wx.BoxSizer(wx.VERTICAL)
typeSizer = wx.BoxSizer(wx.HORIZONTAL)
typeSizer.Add(wx.StaticText(self, wx.ID_ANY, _("URI type:")), border=5, flag=wx.ALIGN_CENTER_VERTICAL | wx.ALL)
typeSizer.Add(self.UriTypeChoice, border=5, flag=wx.ALL)
self.mainSizer.Add(typeSizer)
self.mainSizer.Add(self.PanelSizer, border=5, flag=wx.ALL)
self.mainSizer.Add(self.ButtonSizer, border=5, flag=wx.BOTTOM | wx.ALIGN_CENTER_HORIZONTAL)
self.SetSizer(self.mainSizer)
self.Layout()
self.Fit()
def __init__(self, parent, uri):
wx.Dialog.__init__(self, id=ID_URIWIZARDDIALOG,
name='UriLocationEditor', parent=parent,
title='Uri location')
self.URITYPES = [_("- Select URI type -")]
for connector_type, connector_function in connectors_dialog.iteritems():
try:
connector_function['function']()
self.URITYPES.append(connector_type)
except Exception:
pass
self.selected = None
self.parrent = parent
self.logger = self.parrent.CTR.logger
self._init_ctrls(parent)
self._init_sizers()
self.SetURI(uri)
self.CenterOnParent()
def OnTypeChoice(self, event):
self._removePanelType()
index = event.GetSelection()
if index > 0:
self.selected = event.GetString()
self.panelType = self._getConnectorDialog(self.selected)
if self.panelType:
self.PanelSizer.Add(self.panelType)
self.mainSizer.Layout()
self.Fit()
self.panelType.Refresh()
def SetURI(self, uri):
self._removePanelType()
uri_list = uri.strip().split(":")
if uri_list:
uri_type = uri_list[0].upper()
type = GetConnectorFromURI(uri_type)
if type:
self.selected = type
self.UriTypeChoice.SetStringSelection(self.selected)
self.panelType = self._getConnectorDialog(self.selected)
if self.panelType:
self.panelType.SetURI(uri)
self.PanelSizer.Add(self.panelType)
self.PanelSizer.Layout()
self.mainSizer.Layout()
self.Fit()
self.panelType.Refresh()
def GetURI(self):
if not self.selected or not self.panelType:
return ""
else:
return self.panelType.GetURI()
def _removePanelType(self):
for i in range(self.PanelSizer.GetItemCount()):
item = self.PanelSizer.GetItem(i)
item.DeleteWindows()
self.PanelSizer.Remove(i)
self.Fit()
self.PanelSizer.Layout()
def _getConnectorDialog(self, connectorType):
connector = ConnectorDialog(connectorType, self)
if connector and IConnectorPanel.providedBy(connector):
if verifyObject(IConnectorPanel, connector):
return connector
else:
return None