HGKeeper

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

2018-08-10, Andrey Skvortsov

a3ac46366b86

Executable

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.

# 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.

# Package initialisation

"""

Beremiz Targets

- Target are python packages, containing at least one "XSD" file

- Target class may inherit from a toolchain_(toolchainname)

- The target folder's name must match to name define in the XSD for TargetType

"""

from __future__ import absolute_import

from os import listdir, path

import util.paths as paths

_base_path = paths.AbsDir(__file__)

def _GetLocalTargetClassFactory(name):

return lambda: getattr(__import__(name, globals(), locals()), name+"_target")

targets = dict([(name, {"xsd": path.join(_base_path, name, "XSD"),

"class": _GetLocalTargetClassFactory(name),

"code": {fname: path.join(_base_path, name, fname)

for fname in listdir(path.join(_base_path, name))

if (fname.startswith("plc_%s_main" % name) and

fname.endswith(".c"))}})

for name in listdir(_base_path)

if (path.isdir(path.join(_base_path, name)) and

not name.startswith("__"))])

toolchains = {"gcc": path.join(_base_path, "XSD_toolchain_gcc"),

"makefile": path.join(_base_path, "XSD_toolchain_makefile")}

def GetBuilder(targetname):

return targets[targetname]["class"]()

def GetTargetChoices():

DictXSD_toolchain = {}

targetchoices = ""

# Get all xsd toolchains

for toolchainname, xsdfilename in toolchains.iteritems():

if path.isfile(xsdfilename):

DictXSD_toolchain["toolchain_"+toolchainname] = open(xsdfilename).read()

# Get all xsd targets

for _targetname, nfo in targets.iteritems():

xsd_string = open(nfo["xsd"]).read()

targetchoices += xsd_string % DictXSD_toolchain

return targetchoices

def GetTargetCode(targetname):

codedesc = targets[targetname]["code"]

code = "\n".join([open(fpath).read() for _fname, fpath in sorted(codedesc.items())])

return code

def GetHeader():

filename = paths.AbsNeighbourFile(__file__, "beremiz.h")

return open(filename).read()

def GetCode(name):

filename = paths.AbsNeighbourFile(__file__, name)

return open(filename).read()