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
#
# 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
from c_ext.CFileEditor import CFileEditor
from CodeFileTreeNode import CodeFile
class CFile(CodeFile):
XSD = """<?xml version="1.0" encoding="ISO-8859-1" ?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<xsd:element name="CExtension">
<xsd:complexType>
<xsd:attribute name="CFLAGS" type="xsd:string" use="required"/>
<xsd:attribute name="LDFLAGS" type="xsd:string" use="required"/>
</xsd:complexType>
</xsd:element>
</xsd:schema>
"""
CODEFILE_NAME = "CFile"
SECTIONS_NAMES = [
"includes",
"globals",
"initFunction",
"cleanUpFunction",
"retrieveFunction",
"publishFunction"]
EditorType = CFileEditor
def GetIconName(self):
return "Cfile"
def CodeFileName(self):
return os.path.join(self.CTNPath(), "cfile.xml")
def CTNGenerate_C(self, buildpath, locations):
"""
Generate C code
@param current_location: Tupple containing confnode IEC location : %I0.0.4.5 => (0,0,4,5)
@param locations: List of complete variables locations \
[{"IEC_TYPE" : the IEC type (i.e. "INT", "STRING", ...)
"NAME" : name of the variable (generally "__IW0_1_2" style)
"DIR" : direction "Q","I" or "M"
"SIZE" : size "X", "B", "W", "D", "L"
"LOC" : tuple of interger for IEC location (0,1,2,...)
}, ...]
@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))
text = "/* Code generated by Beremiz c_ext confnode */\n\n"
text += "#include <stdio.h>\n\n"
# Adding includes
text += "/* User includes */\n"
text += self.CodeFile.includes.getanyText().strip()
text += "\n"
text += '#include "iec_types_all.h"\n\n'
# Adding variables
config = self.GetCTRoot().GetProjectConfigNames()[0]
text += "/* User variables reference */\n"
for variable in self.CodeFile.variables.variable:
var_infos = {
"name": variable.getname(),
"global": "%s__%s" % (config.upper(),
variable.getname().upper()),
"type": "__IEC_%s_t" % variable.gettype()}
text += "extern %(type)s %(global)s;\n" % var_infos
text += "#define %(name)s %(global)s.value\n" % var_infos
text += "\n"
# Adding user global variables and routines
text += "/* User internal user variables and routines */\n"
text += self.CodeFile.globals.getanyText().strip()
text += "\n"
# Adding Beremiz confnode functions
text += "/* Beremiz confnode functions */\n"
text += "int __init_%s(int argc,char **argv)\n{\n" % location_str
text += self.CodeFile.initFunction.getanyText().strip()
text += " return 0;\n}\n\n"
text += "void __cleanup_%s(void)\n{\n" % location_str
text += self.CodeFile.cleanUpFunction.getanyText().strip()
text += "\n}\n\n"
text += "void __retrieve_%s(void)\n{\n" % location_str
text += self.CodeFile.retrieveFunction.getanyText().strip()
text += "\n}\n\n"
text += "void __publish_%s(void)\n{\n" % location_str
text += self.CodeFile.publishFunction.getanyText().strip()
text += "\n}\n\n"
Gen_Cfile_path = os.path.join(buildpath, "CFile_%s.c" % location_str)
cfile = open(Gen_Cfile_path, 'w')
cfile.write(text)
cfile.close()
matiec_CFLAGS = '"-I%s"' % os.path.abspath(self.GetCTRoot().GetIECLibPath())
return [(Gen_Cfile_path, str(self.CExtension.getCFLAGS() + matiec_CFLAGS))], str(self.CExtension.getLDFLAGS()), True