beremiz

Proper fix for error 'object has no attribute 'getSlave' in EtherCAT extension

2018-08-24, Andrey Skvortsov
96ca6b056c55
Proper 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


Revert commit "Dirty fix for error '_object_has_no_attribute_'getSlave' in EtherCAT extension"
[a3ac46366b86a0b237dac93be6b2281ac70b98a8].

The problem was that XML elements (proxy object) in some cases were created using custom XML
classes constructors and lxml.etree.Element() call and live python
patching. This causes that lxml backend doesn't know that custom python class
should be used for these XML elements.
Proxy object can be move/deleted and recreated by lxml
backend at any point in time or this can be done in python by copy/deepcopy operations.
If this happens, then newly created
proxy elements are using default class lxml.etree._Element. And all
custom functionality is lost.

All created XML elements should be always created through corresponding
parser and class lookup callback done by lxml backend.
It's described in more details in lxml documentation:
https://lxml.de/element_classes.html
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# This file is part of Beremiz
#
# Copyright (C) 2011-2014: Laurent BESSARD, Edouard TISSERANT
# RTES Lab : CRKim, JBLee, youcu
# Higen Motor : Donggu Kang
#
# See COPYING file for copyrights details.
import wx
from PLCControler import LOCATION_CONFNODE, LOCATION_MODULE, LOCATION_GROUP, LOCATION_VAR_INPUT, LOCATION_VAR_OUTPUT, LOCATION_VAR_MEMORY
from ConfigTreeNode import ConfigTreeNode
from ConfigEditor import NodeEditor
#------------------------------------------
from CommonEtherCATFunction import _CommonSlave
#------------------------------------------
TYPECONVERSION = {"BOOL" : "X", "SINT" : "B", "INT" : "W", "DINT" : "D", "LINT" : "L",
"USINT" : "B", "UINT" : "W", "UDINT" : "D", "ULINT" : "L",
"BYTE" : "B", "WORD" : "W", "DWORD" : "D", "LWORD" : "L"}
DATATYPECONVERSION = {"BOOL" : "BIT", "SINT" : "S8", "INT" : "S16", "DINT" : "S32", "LINT" : "S64",
"USINT" : "U8", "UINT" : "U16", "UDINT" : "U32", "ULINT" : "U64",
"BYTE" : "U8", "WORD" : "U16", "DWORD" : "U32", "LWORD" : "U64"}
VARCLASSCONVERSION = {"T": LOCATION_VAR_INPUT, "R": LOCATION_VAR_OUTPUT, "RT": LOCATION_VAR_MEMORY}
def ExtractHexDecValue(value):
try:
return int(value)
except:
pass
try:
return int(value.replace("#", "0"), 16)
except:
raise ValueError, "Invalid value for HexDecValue \"%s\"" % value
def GenerateHexDecValue(value, base=10):
if base == 10:
return str(value)
elif base == 16:
return "#x%.8x" % value
else:
raise ValueError, "Not supported base"
def ExtractName(names, default=None):
if len(names) == 1:
return names[0].getcontent()
else:
for name in names:
if name.getLcId() == 1033:
return name.getcontent()
return default
#--------------------------------------------------
# Ethercat Node
#--------------------------------------------------
class _EthercatSlaveCTN:
NODE_PROFILE = None
EditorType = NodeEditor
def __init__(self):
# ----------- call ethercat mng. function --------------
self.CommonMethod = _CommonSlave(self)
def GetIconName(self):
return "Slave"
def ExtractHexDecValue(self, value):
return ExtractHexDecValue(value)
def GetSizeOfType(self, type):
return TYPECONVERSION.get(self.GetCTRoot().GetBaseType(type), None)
def GetSlavePos(self):
return self.BaseParams.getIEC_Channel()
def GetParamsAttributes(self, path = None):
if path:
parts = path.split(".", 1)
if self.MandatoryParams and parts[0] == self.MandatoryParams[0]:
return self.MandatoryParams[1].getElementInfos(parts[0], parts[1])
elif self.CTNParams and parts[0] == self.CTNParams[0]:
return self.CTNParams[1].getElementInfos(parts[0], parts[1])
else:
params = []
if self.CTNParams:
params.append(self.CTNParams[1].getElementInfos(self.CTNParams[0]))
else:
params.append({
'use': 'required',
'type': 'element',
'name': 'SlaveParams',
'value': None,
'children': []
})
slave_type = self.CTNParent.GetSlaveType(self.GetSlavePos())
params[0]['children'].insert(0,
{'use': 'optional',
'type': self.CTNParent.GetSlaveTypesLibrary(self.NODE_PROFILE),
'name': 'Type',
'value': (slave_type["device_type"], slave_type)})
params[0]['children'].insert(1,
{'use': 'optional',
'type': 'unsignedLong',
'name': 'Alias',
'value': self.CTNParent.GetSlaveAlias(self.GetSlavePos())})
return params
def SetParamsAttribute(self, path, value):
self.GetSlaveInfos()
position = self.BaseParams.getIEC_Channel()
if path == "SlaveParams.Type":
self.CTNParent.SetSlaveType(position, value)
slave_type = self.CTNParent.GetSlaveType(self.GetSlavePos())
value = (slave_type["device_type"], slave_type)
#if self._View is not None:
#wx.CallAfter(self._View.EtherCATManagementTreebook.SlaveStatePanel.RefreshSlaveInfos())
#self._View.EtherCATManagementTreebook.SlaveStatePanel.RefreshSlaveInfos()
#self._View.EtherCATManagementTreebook.PDOMonitoringPanel.PDOInfoUpdate()
#self._View.EtherCATManagementTreebook.SmartView.Create_SmartView()
return value, True
elif path == "SlaveParams.Alias":
self.CTNParent.SetSlaveAlias(position, value)
return value, True
value, refresh = ConfigTreeNode.SetParamsAttribute(self, path, value)
# Filter IEC_Channel, Slave_Type and Alias that have specific behavior
if path == "BaseParams.IEC_Channel" and value != position:
self.CTNParent.SetSlavePosition(position, value)
return value, refresh
def GetSlaveInfos(self):
return self.CTNParent.GetSlaveInfos(self.GetSlavePos())
def GetSlaveVariables(self, limits):
return self.CTNParent.GetSlaveVariables(self.GetSlavePos(), limits)
def GetVariableLocationTree(self):
return {"name": self.BaseParams.getName(),
"type": LOCATION_CONFNODE,
"location": self.GetFullIEC_Channel(),
"children": self.CTNParent.GetDeviceLocationTree(self.GetSlavePos(), self.GetCurrentLocation(), self.BaseParams.getName())
}
def CTNGenerate_C(self, buildpath, locations):
return [],"",False