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
<?xml version='1.0' encoding='utf-8'?>
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<fileHeader companyName="Beremiz" productName="Beremiz" productVersion="1" creationDateTime="2016-10-24T18:09:22"/>
<contentHeader name="First Steps" modificationDateTime="2018-08-24T13:11:30">
<coordinateInfo>
<fbd>
<scaling x="0" y="0"/>
</fbd>
<ld>
<scaling x="0" y="0"/>
</ld>
<sfc>
<scaling x="0" y="0"/>
</sfc>
</coordinateInfo>
</contentHeader>
<types>
<dataTypes/>
<pous>
<pou name="AverageVal" pouType="function">
<interface>
<returnType>
<REAL/>
</returnType>
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<variable name="Cnt1">
<type>
<INT/>
</type>
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<type>
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<variable name="Cnt3">
<type>
<INT/>
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</variable>
<variable name="Cnt4">
<type>
<INT/>
</type>
</variable>
<variable name="Cnt5">
<type>
<INT/>
</type>
</variable>
</inputVars>
<localVars>
<variable name="InputsNumber">
<type>
<REAL/>
</type>
<initialValue>
<simpleValue value="5.0"/>
</initialValue>
<documentation>
<xhtml:p><![CDATA[Количество входных значений]]></xhtml:p>
</documentation>
</variable>
</localVars>
</interface>
<body>
<ST>
<xhtml:p><![CDATA[AverageVal := INT_TO_REAL(Cnt1+Cnt2+Cnt3+Cnt4+Cnt5)/InputsNumber;]]></xhtml:p>
</ST>
</body>
</pou>
<pou name="plc_prg" pouType="program">
<interface>
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<variable name="Reset">
<type>
<BOOL/>
</type>
</variable>
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<variable name="Cnt1">
<type>
<INT/>
</type>
</variable>
<variable name="Cnt2">
<type>
<INT/>
</type>
</variable>
<variable name="Cnt3">
<type>
<INT/>
</type>
</variable>
<variable name="Cnt4">
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<variable name="Cnt5">
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<connection refLocalId="2">
<position x="207" y="93"/>
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</connection>
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</variable>
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<inOutVariables/>
<outputVariables>
<variable formalParameter="OUT">
<connectionPointOut>
<relPosition x="125" y="40"/>
</connectionPointOut>
</variable>
</outputVariables>
</block>
<inVariable localId="2" executionOrderId="0" height="30" width="79" negated="false">
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<expression>Reset</expression>
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<xhtml:p><![CDATA[In this example function block with the same functionality
is created using all five IEC 61131-3 programing languages:
- IL;
- FBD;
- LD;
- ST;
- SFC.
Function block is a counter with reset control input.
If reset is True counter value is reset to the value defined by
global configuration constant ResetCounterValue.
If reset is False, counter is incremented every cycle.
]]></xhtml:p>
</content>
</comment>
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<position x="211" y="237"/>
<inputVariables>
<variable formalParameter="Reset">
<connectionPointIn>
<relPosition x="0" y="36"/>
<connection refLocalId="12">
<position x="211" y="273"/>
<position x="103" y="273"/>
</connection>
</connectionPointIn>
</variable>
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<inOutVariables/>
<outputVariables>
<variable formalParameter="OUT">
<connectionPointOut>
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<block localId="9" typeName="CounterIL" instanceName="CounterIL0" executionOrderId="0" height="62" width="121">
<position x="211" y="322"/>
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<expression>Reset</expression>
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<position x="36" y="170"/>
<connectionPointOut>
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<expression>Reset</expression>
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<inVariable localId="16" executionOrderId="0" height="30" width="64" negated="false">
<position x="36" y="440"/>
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<position x="514" y="183"/>
<position x="497" y="183"/>
<position x="497" y="182"/>
<position x="473" y="182"/>
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<position x="514" y="273"/>
<position x="472" y="273"/>
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<position x="514" y="363"/>
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<expression>Cnt1</expression>
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<position x="332" y="182"/>
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<expression>Cnt2</expression>
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ELSE
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Out := Cnt;]]></xhtml:p>
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<interface>
<inputVars>
<variable name="Reset">
<type>
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<outputVars>
<variable name="OUT">
<type>
<INT/>
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<variable name="Cnt">
<type>
<INT/>
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<variable name="ResetCounterValue">
<type>
<INT/>
</type>
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<actions/>
<body>
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<connectionPointOut formalParameter="">
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<inline name="">
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</connectionPointIn>
<connectionPointOut>
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</connectionPointOut>
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<inline name="">
<ST>
<xhtml:p><![CDATA[NOT Reset]]></xhtml:p>
</ST>
</inline>
</condition>
</transition>
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<position x="501" y="134"/>
</connection>
</connectionPointIn>
<connectionPointOut formalParameter="">
<relPosition x="52" y="30"/>
</connectionPointOut>
<connectionPointOutAction formalParameter="">
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</connectionPointOutAction>
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<position x="553" y="202"/>
</connection>
</connectionPointIn>
<action localId="0">
<relPosition x="0" y="0"/>
<inline>
<ST>
<xhtml:p><![CDATA[Cnt := ResetCounterValue;]]></xhtml:p>
</ST>
</inline>
</action>
<action localId="0">
<relPosition x="0" y="0"/>
<inline>
<ST>
<xhtml:p><![CDATA[OUT := Cnt;]]></xhtml:p>
</ST>
</inline>
</action>
</actionBlock>
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<connection refLocalId="4">
<position x="70" y="191"/>
<position x="70" y="137"/>
</connection>
</connectionPointIn>
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<position x="113" y="203"/>
</connection>
</connectionPointIn>
<action localId="0">
<relPosition x="0" y="0"/>
<inline>
<ST>
<xhtml:p><![CDATA[Cnt := Cnt + 1;]]></xhtml:p>
</ST>
</inline>
</action>
<action localId="0">
<relPosition x="0" y="0"/>
<inline>
<ST>
<xhtml:p><![CDATA[OUT := Cnt;]]></xhtml:p>
</ST>
</inline>
</action>
</actionBlock>
<selectionConvergence localId="10" height="1" width="431">
<position x="70" y="273"/>
<connectionPointIn>
<relPosition x="0" y="0"/>
<connection refLocalId="13">
<position x="70" y="273"/>
<position x="70" y="244"/>
</connection>
</connectionPointIn>
<connectionPointIn>
<relPosition x="431" y="0"/>
<connection refLocalId="14">
<position x="501" y="273"/>
<position x="501" y="250"/>
</connection>
</connectionPointIn>
<connectionPointOut>
<relPosition x="216" y="1"/>
</connectionPointOut>
</selectionConvergence>
<jumpStep localId="12" targetName="Start" height="13" width="12">
<position x="280" y="317"/>
<connectionPointIn>
<relPosition x="6" y="0"/>
<connection refLocalId="10">
<position x="286" y="317"/>
<position x="286" y="274"/>
</connection>
</connectionPointIn>
</jumpStep>
<transition localId="13" height="2" width="20" executionOrderId="0">
<position x="60" y="242"/>
<connectionPointIn>
<relPosition x="10" y="0"/>
<connection refLocalId="7">
<position x="70" y="242"/>
<position x="70" y="215"/>
</connection>
</connectionPointIn>
<connectionPointOut>
<relPosition x="10" y="2"/>
</connectionPointOut>
<condition>
<inline name="">
<ST>
<xhtml:p><![CDATA[Reset]]></xhtml:p>
</ST>
</inline>
</condition>
</transition>
<transition localId="14" height="2" width="20" executionOrderId="0">
<position x="491" y="248"/>
<connectionPointIn>
<relPosition x="10" y="0"/>
<connection refLocalId="5">
<position x="501" y="248"/>
<position x="501" y="214"/>
</connection>
</connectionPointIn>
<connectionPointOut>
<relPosition x="10" y="2"/>
</connectionPointOut>
<condition>
<inline name="">
<ST>
<xhtml:p><![CDATA[NOT Reset]]></xhtml:p>
</ST>
</inline>
</condition>
</transition>
</SFC>
</body>
</pou>
<pou name="CounterIL" pouType="functionBlock">
<interface>
<localVars>
<variable name="Cnt">
<type>
<INT/>
</type>
</variable>
</localVars>
<inputVars>
<variable name="Reset">
<type>
<BOOL/>
</type>
</variable>
</inputVars>
<outputVars>
<variable name="OUT">
<type>
<INT/>
</type>
</variable>
</outputVars>
<externalVars constant="true">
<variable name="ResetCounterValue">
<type>
<INT/>
</type>
</variable>
</externalVars>
</interface>
<body>
<IL>
<xhtml:p><![CDATA[LD Reset
JMPC ResetCnt
(* increment counter *)
LD Cnt
ADD 1
JMP QuitFb
ResetCnt:
(* reset counter *)
LD ResetCounterValue
QuitFb:
(* save results *)
ST Cnt
ST Out
]]></xhtml:p>
</IL>
</body>
</pou>
<pou name="CounterLD" pouType="functionBlock">
<interface>
<inputVars>
<variable name="Reset">
<type>
<BOOL/>
</type>
</variable>
</inputVars>
<outputVars>
<variable name="Out">
<type>
<INT/>
</type>
</variable>
</outputVars>
<localVars>
<variable name="Cnt">
<type>
<INT/>
</type>
</variable>
</localVars>
<externalVars constant="true">
<variable name="ResetCounterValue">
<type>
<INT/>
</type>
</variable>
</externalVars>
</interface>
<body>
<LD>
<outVariable localId="2" executionOrderId="0" height="30" width="34" negated="false">
<position x="527" y="90"/>
<connectionPointIn>
<relPosition x="0" y="15"/>
<connection refLocalId="3">
<position x="527" y="105"/>
<position x="441" y="105"/>
</connection>
</connectionPointIn>
<expression>Out</expression>
</outVariable>
<inOutVariable localId="3" executionOrderId="0" height="30" width="32" negatedOut="false" negatedIn="false">
<position x="409" y="90"/>
<connectionPointIn>
<relPosition x="0" y="15"/>
<connection refLocalId="7" formalParameter="OUT">
<position x="409" y="105"/>
<position x="388" y="105"/>
<position x="388" y="102"/>
<position x="367" y="102"/>
</connection>
</connectionPointIn>
<connectionPointOut>
<relPosition x="32" y="15"/>
</connectionPointOut>
<expression>Cnt</expression>
</inOutVariable>
<block localId="4" typeName="ADD" executionOrderId="0" height="80" width="67">
<position x="180" y="87"/>
<inputVariables>
<variable formalParameter="IN1">
<connectionPointIn>
<relPosition x="0" y="35"/>
<connection refLocalId="6">
<position x="180" y="122"/>
<position x="153" y="122"/>
<position x="153" y="125"/>
<position x="127" y="125"/>
</connection>
</connectionPointIn>
</variable>
<variable formalParameter="IN2">
<connectionPointIn>
<relPosition x="0" y="65"/>
<connection refLocalId="3">
<position x="180" y="152"/>
<position x="169" y="152"/>
<position x="169" y="185"/>
<position x="451" y="185"/>
<position x="451" y="105"/>
<position x="441" y="105"/>
</connection>
</connectionPointIn>
</variable>
</inputVariables>
<inOutVariables/>
<outputVariables>
<variable formalParameter="OUT">
<connectionPointOut>
<relPosition x="67" y="35"/>
</connectionPointOut>
</variable>
</outputVariables>
</block>
<inVariable localId="5" executionOrderId="0" height="30" width="158" negated="false">
<position x="74" y="228"/>
<connectionPointOut>
<relPosition x="158" y="15"/>
</connectionPointOut>
<expression>ResetCounterValue</expression>
</inVariable>
<inVariable localId="6" executionOrderId="0" height="30" width="21" negated="false">
<position x="106" y="110"/>
<connectionPointOut>
<relPosition x="21" y="15"/>
</connectionPointOut>
<expression>1</expression>
</inVariable>
<block localId="7" typeName="SEL" executionOrderId="0" height="80" width="67">
<position x="300" y="72"/>
<inputVariables>
<variable formalParameter="G">
<connectionPointIn>
<relPosition x="0" y="30"/>
<connection refLocalId="9">
<position x="300" y="102"/>
<position x="266" y="102"/>
<position x="266" y="62"/>
<position x="134" y="62"/>
</connection>
</connectionPointIn>
</variable>
<variable formalParameter="IN0">
<connectionPointIn>
<relPosition x="0" y="50"/>
<connection refLocalId="4" formalParameter="OUT">
<position x="300" y="122"/>
<position x="247" y="122"/>
</connection>
</connectionPointIn>
</variable>
<variable formalParameter="IN1">
<connectionPointIn>
<relPosition x="0" y="70"/>
<connection refLocalId="5">
<position x="300" y="142"/>
<position x="266" y="142"/>
<position x="266" y="243"/>
<position x="232" y="243"/>
</connection>
</connectionPointIn>
</variable>
</inputVariables>
<inOutVariables/>
<outputVariables>
<variable formalParameter="OUT">
<connectionPointOut>
<relPosition x="67" y="30"/>
</connectionPointOut>
</variable>
</outputVariables>
</block>
<leftPowerRail localId="8" height="40" width="3">
<position x="46" y="42"/>
<connectionPointOut formalParameter="">
<relPosition x="3" y="20"/>
</connectionPointOut>
</leftPowerRail>
<contact localId="9" height="15" width="21" negated="false">
<position x="113" y="54"/>
<connectionPointIn>
<relPosition x="0" y="8"/>
<connection refLocalId="8">
<position x="113" y="62"/>
<position x="49" y="62"/>
</connection>
</connectionPointIn>
<connectionPointOut>
<relPosition x="21" y="8"/>
</connectionPointOut>
<variable>Reset</variable>
</contact>
</LD>
</body>
</pou>
</pous>
</types>
<instances>
<configurations>
<configuration name="config">
<resource name="resource1">
<task name="plc_task" priority="1" interval="T#100ms">
<pouInstance name="plc_task_instance" typeName="plc_prg"/>
</task>
</resource>
<globalVars constant="true">
<variable name="ResetCounterValue">
<type>
<INT/>
</type>
<initialValue>
<simpleValue value="17"/>
</initialValue>
</variable>
</globalVars>
</configuration>
</configurations>
</instances>
</project>