connectors/PYRO/__init__.py
author Andrey Skvortsov <andrej.skvortzov@gmail.com>
Thu, 16 Aug 2018 13:42:18 +0300
changeset 2289 cf0934b42d66
parent 2010 bb9c28bd204f
child 2312 84b3cc18893b
child 2416 1ca207782dde
permissions -rwxr-xr-x
Update README for WAMP example to use crossbar with python3

crossbar python2 support is broken in v18.7.2.
I've submitted with fixes for that.
https://github.com/crossbario/crossbar/pull/1376

But they don't test crossbar with python2 in CI, so it's going to be
broken again in the future.
And there is no much reason to use crossbar with python2.
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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 __future__ import absolute_import
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from __future__ import print_function
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import traceback
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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 Pyro
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import Pyro.core
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import Pyro.util
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from Pyro.errors import PyroError
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service_type = '_PYRO._tcp.local.'
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# this module attribute contains a list of DNS-SD (Zeroconf) service types
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# supported by this connector confnode.
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#
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# for connectors that do not support DNS-SD, this attribute can be omitted
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# or set to an empty list.
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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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    servicetype, location = uri.split("://")
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    if servicetype == "PYROS":
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        schemename = "PYROLOCSSL"
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        # Protect against name->IP substitution in Pyro3
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        Pyro.config.PYRO_DNS_URI = True
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        # Beware Pyro lib need str path, not unicode
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        # don't rely on PYRO_STORAGE ! see documentation
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        Pyro.config.PYROSSL_CERTDIR = os.path.abspath(str(confnodesroot.ProjectPath) + '/certs')
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        if not os.path.exists(Pyro.config.PYROSSL_CERTDIR):
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            confnodesroot.logger.write_error(
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                'Error : the directory %s is missing for SSL certificates (certs_dir).'
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                'Please fix it in your project.\n' % Pyro.config.PYROSSL_CERTDIR)
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            return None
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        else:
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            confnodesroot.logger.write(_("PYRO using certificates in '%s' \n")
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                                       % (Pyro.config.PYROSSL_CERTDIR))
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        Pyro.config.PYROSSL_CERT = "client.crt"
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        Pyro.config.PYROSSL_KEY = "client.key"
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        # Ugly Monkey Patching
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        def _gettimeout(self):
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            return self.timeout
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        def _settimeout(self, timeout):
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            self.timeout = timeout
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        from M2Crypto.SSL import Connection  # pylint: disable=import-error
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        Connection.timeout = None
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        Connection.gettimeout = _gettimeout
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        Connection.settimeout = _settimeout
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        # M2Crypto.SSL.Checker.WrongHost: Peer certificate commonName does not
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        # match host, expected 127.0.0.1, got server
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        Connection.clientPostConnectionCheck = None
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    else:
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        schemename = "PYROLOC"
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    if location.find(service_type) != -1:
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        try:
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            from zeroconf import Zeroconf
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            r = Zeroconf()
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            i = r.get_service_info(service_type, location)
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            if i is None:
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                raise Exception("'%s' not found" % location)
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            ip = str(socket.inet_ntoa(i.address))
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            port = str(i.port)
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            newlocation = ip + ':' + port
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            confnodesroot.logger.write(_("'{a1}' is located at {a2}\n").format(a1=location, a2=newlocation))
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            location = newlocation
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            r.close()
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        except Exception:
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            confnodesroot.logger.write_error(_("MDNS resolution failure for '%s'\n") % location)
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            confnodesroot.logger.write_error(traceback.format_exc())
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            return None
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    # Try to get the proxy object
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    try:
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        RemotePLCObjectProxy = Pyro.core.getAttrProxyForURI(schemename + "://" + location + "/PLCObject")
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    except Exception:
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        confnodesroot.logger.write_error(_("Connection to '%s' failed.\n") % location)
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        confnodesroot.logger.write_error(traceback.format_exc())
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        return None
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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 Pyro.errors.ConnectionClosedError, e:
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                confnodesroot.logger.write_error(_("Connection lost!\n"))
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                confnodesroot._SetConnector(None)
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            except Pyro.errors.ProtocolError, e:
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                confnodesroot.logger.write_error(_("Pyro exception: %s\n") % e)
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            except Exception, e:
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                # confnodesroot.logger.write_error(traceback.format_exc())
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                errmess = ''.join(Pyro.util.getPyroTraceback(e))
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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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    if PyroCatcher(RemotePLCObjectProxy.GetPLCstatus)() is None:
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        confnodesroot.logger.write_error(_("Cannot get PLC status - connection failed.\n"))
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        return None
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1995
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    _special_return_funcs = {
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        "StartPLC": False,
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        "GetTraceVariables": ("Broken", None),
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        "GetPLCstatus": ("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()