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) 2007: Edouard TISSERANT and Laurent BESSARD
# 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 os
import shutil
import wx
from svgui.pyjs import translate
import util.paths as paths
from POULibrary import POULibrary
from docutil import open_svg
from py_ext import PythonFileCTNMixin
class SVGUILibrary(POULibrary):
def GetLibraryPath(self):
return paths.AbsNeighbourFile(__file__, "pous.xml")
class SVGUI(PythonFileCTNMixin):
ConfNodeMethods = [
{
"bitmap": "ImportSVG",
"name": _("Import SVG"),
"tooltip": _("Import SVG"),
"method": "_ImportSVG"
},
{
"bitmap": "ImportSVG", # should be something different
"name": _("Inkscape"),
"tooltip": _("Create HMI"),
"method": "_StartInkscape"
},
]
def ConfNodePath(self):
return paths.AbsDir(__file__)
def _getSVGpath(self, project_path=None):
if project_path is None:
project_path = self.CTNPath()
# define name for SVG file containing gui layout
return os.path.join(project_path, "gui.svg")
def _getSVGUIserverpath(self):
return paths.AbsNeighbourFile(__file__, "svgui_server.py")
def OnCTNSave(self, from_project_path=None):
if from_project_path is not None:
shutil.copyfile(self._getSVGpath(from_project_path),
self._getSVGpath())
return PythonFileCTNMixin.OnCTNSave(self, from_project_path)
def CTNGenerate_C(self, buildpath, locations):
"""
Return C code generated by iec2c compiler
when _generate_softPLC have been called
@param locations: ignored
@return: [(C_file_name, CFLAGS),...] , LDFLAGS_TO_APPEND
"""
current_location = self.GetCurrentLocation()
# define a unique name for the generated C file
location_str = "_".join(map(str, current_location))
res = ([], "", False)
svgfile = self._getSVGpath()
if os.path.exists(svgfile):
res += (("gui.svg", file(svgfile, "rb")),)
svguiserverfile = open(self._getSVGUIserverpath(), 'r')
svguiservercode = svguiserverfile.read()
svguiserverfile.close()
svguilibpath = os.path.join(self._getBuildPath(), "svguilib.js")
svguilibfile = open(svguilibpath, 'w')
fpath = paths.AbsDir(__file__)
svguilibfile.write(translate(os.path.join(fpath, "pyjs", "lib", "sys.py"), "sys"))
svguilibfile.write(open(os.path.join(fpath, "pyjs", "lib", "_pyjs.js"), 'r').read())
svguilibfile.write(translate(os.path.join(fpath, "pyjs", "lib", "pyjslib.py"), "pyjslib"))
svguilibfile.write(translate(os.path.join(fpath, "svguilib.py"), "svguilib"))
svguilibfile.write("pyjslib();\nsvguilib();\n")
svguilibfile.write(open(os.path.join(fpath, "pyjs", "lib", "json.js"), 'r').read())
svguilibfile.write(open(os.path.join(fpath, "livesvg.js"), 'r').read())
svguilibfile.close()
jsmodules = {"LiveSVGPage": "svguilib.js"}
res += (("svguilib.js", file(svguilibpath, "rb")),)
runtimefile_path = os.path.join(buildpath, "runtime_%s.py" % location_str)
runtimefile = open(runtimefile_path, 'w')
runtimefile.write(svguiservercode % {"svgfile": "gui.svg"})
runtimefile.write("""
def _runtime_%(location)s_start():
website.LoadHMI(%(svgui_class)s, %(jsmodules)s)
def _runtime_%(location)s_stop():
website.UnLoadHMI()
""" % {"location": location_str,
"svgui_class": "SVGUI_HMI",
"jsmodules": str(jsmodules)})
runtimefile.close()
res += (("runtime_%s.py" % location_str, file(runtimefile_path, "rb")),)
return res
def _ImportSVG(self):
dialog = wx.FileDialog(self.GetCTRoot().AppFrame, _("Choose a SVG file"), os.getcwd(), "", _("SVG files (*.svg)|*.svg|All files|*.*"), wx.OPEN)
if dialog.ShowModal() == wx.ID_OK:
svgpath = dialog.GetPath()
if os.path.isfile(svgpath):
shutil.copy(svgpath, self._getSVGpath())
else:
self.GetCTRoot().logger.write_error(_("No such SVG file: %s\n") % svgpath)
dialog.Destroy()
def _StartInkscape(self):
svgfile = self._getSVGpath()
open_inkscape = True
if not self.GetCTRoot().CheckProjectPathPerm():
dialog = wx.MessageDialog(self.GetCTRoot().AppFrame,
_("You don't have write permissions.\nOpen Inkscape anyway ?"),
_("Open Inkscape"),
wx.YES_NO | wx.ICON_QUESTION)
open_inkscape = dialog.ShowModal() == wx.ID_YES
dialog.Destroy()
if open_inkscape:
if not os.path.isfile(svgfile):
svgfile = None
open_svg(svgfile)