HGKeeper

#!/usr/bin/env python

# -*- coding: utf-8 -*-

#See COPYING file for copyrights details.

#This library is free software; you can redistribute it and/or

#modify it under the terms of the GNU General Public

#License as published by the Free Software Foundation; either

#version 2.1 of the License, or (at your option) any later version.

#This library is distributed in the hope that it will be useful,

#but WITHOUT ANY WARRANTY; without even the implied warranty of

#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

#General Public License for more details.

#You should have received a copy of the GNU General Public

#License along with this library; if not, write to the Free Software

#Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

import traceback

def LPC_connector_factory(uri, pluginsroot):

"""

This returns the connector to LPC style PLCobject

"""

pluginsroot.logger.write(_("Connecting to URI : %s\n")%uri)

servicetype, location = uri.split("://")

# Try to get the proxy object

try :

# TODO: Open Serial Port

RemotePLCObjectProxy = LPCObject(pluginsroot) # LPC_PLCObject_Proxy

except Exception, msg:

pluginsroot.logger.write_error(_("Couldn't connect !\n"))

pluginsroot.logger.write_error(traceback.format_exc())

return None

def LPCCatcher(func, default=None):

"""

A function that catch a pyserial exceptions, write error to logger

and return defaul value when it happen

"""

def catcher_func(*args,**kwargs):

try:

return func(*args,**kwargs)

except Exception,e:

#pluginsroot.logger.write_error(traceback.format_exc())

pluginsroot.logger.write_error(str(e)+"\n")

pluginsroot._connector = None

return default

return catcher_func

# Check connection is effective.

# lambda is for getattr of GetPLCstatus to happen inside catcher

if LPCCatcher(lambda:RemotePLCObjectProxy.GetPLCstatus())() == None:

pluginsroot.logger.write_error(_("Cannot get PLC status - connection failed.\n"))

return None

class LPCProxy:

"""

A Serial proxy class to handle Beremiz Pyro interface specific behavior.

And to put LPC exception catcher in between caller and pyro proxy

"""

def _LPCGetTraceVariables(self):

return self.RemotePLCObjectProxy.GetTraceVariables()

GetTraceVariables = LPCCatcher(_LPCGetTraceVariables,("Broken",None,None))

def _LPCGetPLCstatus(self):

return RemotePLCObjectProxy.GetPLCstatus()

GetPLCstatus = LPCCatcher(_LPCGetPLCstatus, "Broken")

def __getattr__(self, attrName):

member = self.__dict__.get(attrName, None)

if member is None:

def my_local_func(*args,**kwargs):

return RemotePLCObjectProxy.__getattr__(attrName)(*args,**kwargs)

member = LPCCatcher(my_local_func, None)

self.__dict__[attrName] = member

return member

return LPCProxy()

beremiz