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tests/wamp/.crossbar/config.json
author Andrey Skvortsov <andrej.skvortzov@gmail.com>
Fri, 10 Aug 2018 17:45:33 +0300
changeset 2278 a3ac46366b86
parent 1895 876ce4e492a1
child 2194 35d6b9321ffd
permissions -rw-r--r--
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():
<type 'exceptions.AttributeError'>:_'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))
[-------------------------------------------------------------]
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{
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    "version": 2,
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    "controller": {},
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    "workers": [
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        {
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            "type": "router",
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            "options": {
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                "pythonpath": [
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                    ".."
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                ]
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            },
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            "realms": [
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                {
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                    "name": "Automation",
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                    "roles": [
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                        {
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                            "name": "anonymous",
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                            "permissions": [
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                                {
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                                    "uri": "",
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                                    "match": "prefix",
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                                    "allow": {
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                                        "call": true,
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                                        "register": true,
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                                        "publish": true,
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                                        "subscribe": true
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                                    },
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                                    "disclose": {
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                                        "caller": false,
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                                        "publisher": false
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                                    },
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                                    "cache": true
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                                }
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                            ]
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                        }
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                    ]
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                }
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            ],
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            "transports": [
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                {
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                    "type": "websocket",
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                    "endpoint": {
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                        "type": "tcp",
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                        "port": 8888
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                    },
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                    "url": "ws://127.0.0.1:8888/",
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                    "serializers": [
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                        "msgpack"
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                    ]
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                }
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            ]
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        }
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    ]
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parents:
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}
beremiz