connectors/PYRO/__init__.py
author Edouard Tisserant <edouard.tisserant@gmail.com>
Tue, 30 May 2023 13:00:50 +0200
changeset 3815 56f08ab3a491
parent 3808 3e219f00151a
child 3881 0b3ac94f494c
permissions -rw-r--r--
Tests: Fix dockerfile for python3
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# This file is part of Beremiz, a Integrated Development Environment for
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# programming IEC 61131-3 automates supporting plcopen standard and CanFestival.
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#
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# Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD
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#
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# See COPYING file for copyrights details.
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
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from time import sleep
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import copy
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import socket
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import os.path
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import Pyro5
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import Pyro5.client
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import Pyro5.errors
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# TODO: PSK
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from runtime import PlcStatus
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import importlib
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Pyro5.config.SERIALIZER = "msgpack"
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def PYRO_connector_factory(uri, confnodesroot):
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    """
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    This returns the connector to Pyro style PLCobject
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    """
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    confnodesroot.logger.write(_("PYRO connecting to URI : %s\n") % uri)
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    scheme, location = uri.split("://")
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    # TODO: use ssl
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    schemename = "PYRO"
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    # Try to get the proxy object
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    try:
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        RemotePLCObjectProxy = Pyro5.client.Proxy(f"{schemename}:PLCObject@{location}")
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    except Exception as e:
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        confnodesroot.logger.write_error(
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            _("Connection to {loc} failed with exception {ex}\n").format(
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                loc=location, ex=str(e)))
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        return None
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    RemotePLCObjectProxy._pyroTimeout = 60
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    def PyroCatcher(func, default=None):
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        """
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        A function that catch a Pyro exceptions, write error to logger
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        and return default value when it happen
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        """
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        def catcher_func(*args, **kwargs):
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            try:
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                return func(*args, **kwargs)
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            except Pyro5.errors.ConnectionClosedError as e:
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                confnodesroot._SetConnector(None)
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                confnodesroot.logger.write_error(_("Connection lost!\n"))
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            except Pyro5.errors.ProtocolError as e:
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                confnodesroot.logger.write_error(_("Pyro exception: %s\n") % e)
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            except Exception as e:
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                errmess = ''.join(Pyro5.errors.get_pyro_traceback())
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                confnodesroot.logger.write_error(errmess + "\n")
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                print(errmess)
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                confnodesroot._SetConnector(None)
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            return default
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        return catcher_func
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    # Check connection is effective.
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    # lambda is for getattr of GetPLCstatus to happen inside catcher
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    IDPSK = PyroCatcher(RemotePLCObjectProxy.GetPLCID)()
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    if IDPSK is None:
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        confnodesroot.logger.write_warning(_("PLC did not provide identity and security infomation.\n"))
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    else:
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        ID, secret = IDPSK
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        PSK.UpdateID(confnodesroot.ProjectPath, ID, secret, uri)
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    _special_return_funcs = {
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        "StartPLC": False,
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        "GetTraceVariables": (PlcStatus.Broken, None),
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        "GetPLCstatus": (PlcStatus.Broken, None),
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        "RemoteExec": (-1, "RemoteExec script failed!")
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    }
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    class PyroProxyProxy(object):
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        """
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        A proxy proxy class to handle Beremiz Pyro interface specific behavior.
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        And to put Pyro exception catcher in between caller and Pyro proxy
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        """
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        def __getattr__(self, attrName):
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            member = self.__dict__.get(attrName, None)
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            if member is None:
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                def my_local_func(*args, **kwargs):
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                    return RemotePLCObjectProxy.__getattr__(attrName)(*args, **kwargs)
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                member = PyroCatcher(my_local_func, _special_return_funcs.get(attrName, None))
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                self.__dict__[attrName] = member
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            return member
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    return PyroProxyProxy