connectors/PYRO/__init__.py
author Andrey Skvortsov <andrej.skvortzov@gmail.com>
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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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from runtime import PlcStatus
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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 as 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 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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                # 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": (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()