etisserant@203: #!/usr/bin/env python
etisserant@203: # -*- coding: utf-8 -*-
etisserant@203: #
etisserant@203: #Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD
etisserant@203: #
etisserant@203: #See COPYING file for copyrights details.
etisserant@203: #
etisserant@203: #This library is free software; you can redistribute it and/or
etisserant@203: #modify it under the terms of the GNU General Public
etisserant@203: #License as published by the Free Software Foundation; either
etisserant@203: #version 2.1 of the License, or (at your option) any later version.
etisserant@203: #
etisserant@203: #This library is distributed in the hope that it will be useful,
etisserant@203: #but WITHOUT ANY WARRANTY; without even the implied warranty of
etisserant@203: #MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
etisserant@203: #General Public License for more details.
etisserant@203: #
etisserant@203: #You should have received a copy of the GNU General Public
etisserant@203: #License along with this library; if not, write to the Free Software
etisserant@203: #Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
etisserant@203: import Pyro.core as pyro
etisserant@203: from Pyro.errors import PyroError
etisserant@203: import traceback
etisserant@203: from time import sleep
etisserant@231: import copy
etisserant@203:
etisserant@203: def PYRO_connector_factory(uri, pluginsroot):
etisserant@203: """
etisserant@203: This returns the connector to Pyro style PLCobject
etisserant@203: """
etisserant@203: pluginsroot.logger.write("Connecting to URI : %s\n"%uri)
etisserant@203:
etisserant@203: servicetype, location = uri.split("://")
etisserant@203:
etisserant@203: # Try to get the proxy object
etisserant@203: try :
etisserant@203: RemotePLCObjectProxy = pyro.getAttrProxyForURI("PYROLOC://"+location+"/PLCObject")
etisserant@203: except Exception, msg:
etisserant@203: pluginsroot.logger.write_error("Wrong URI, please check it !\n")
etisserant@203: pluginsroot.logger.write_error(traceback.format_exc())
etisserant@203: return None
etisserant@203:
etisserant@203: def PyroCatcher(func, default=None):
etisserant@203: """
etisserant@203: A function that catch a pyro exceptions, write error to logger
etisserant@203: and return defaul value when it happen
etisserant@203: """
greg@218: def catcher_func(*args,**kwargs):
etisserant@203: try:
etisserant@203: return func(*args,**kwargs)
etisserant@203: except PyroError,e:
etisserant@203: #pluginsroot.logger.write_error(traceback.format_exc())
etisserant@203: pluginsroot.logger.write_error(str(e))
etisserant@203: pluginsroot._Disconnect()
etisserant@203: return default
greg@218: return catcher_func
etisserant@203:
etisserant@203: # Check connection is effective.
etisserant@203: # lambda is for getattr of GetPLCstatus to happen inside catcher
etisserant@203: if PyroCatcher(lambda:RemotePLCObjectProxy.GetPLCstatus())() == None:
etisserant@203: pluginsroot.logger.write_error("Cannot get PLC status - connection failed.\n")
etisserant@203: return None
etisserant@231:
etisserant@231: # for safe use in from debug thread, must create a copy
etisserant@231: RemotePLCObjectProxyCopy = copy.copy(RemotePLCObjectProxy)
etisserant@203:
etisserant@203: class PyroProxyProxy:
etisserant@203: """
etisserant@203: A proxy proxy class to handle Beremiz Pyro interface specific behavior.
etisserant@203: And to put pyro exception catcher in between caller and pyro proxy
etisserant@203: """
etisserant@203: def GetPyroProxy(self):
etisserant@203: """
etisserant@203: This func returns the real Pyro Proxy.
etisserant@203: Use this if you musn't keep reference to it.
etisserant@203: """
etisserant@203: return RemotePLCObjectProxy
etisserant@231:
etisserant@235: def _PyroStartPLC(self, *args, **kwargs):
etisserant@231: """
etisserant@231: pluginsroot._connector.GetPyroProxy() is used
etisserant@231: rather than RemotePLCObjectProxy because
etisserant@231: object is recreated meanwhile,
etisserant@231: so we must not keep ref to it here
etisserant@231: """
etisserant@231: if pluginsroot._connector.GetPyroProxy().GetPLCstatus() == "Dirty":
etisserant@231: """
etisserant@231: Some bad libs with static symbols may polute PLC
etisserant@231: ask runtime to suicide and come back again
etisserant@231: """
etisserant@231: pluginsroot.logger.write("Force runtime reload\n")
etisserant@231: pluginsroot._connector.GetPyroProxy().ForceReload()
etisserant@231: pluginsroot._Disconnect()
etisserant@231: # let remote PLC time to resurect.(freeze app)
etisserant@231: sleep(0.5)
etisserant@231: pluginsroot._Connect()
etisserant@235: return pluginsroot._connector.GetPyroProxy().StartPLC(*args, **kwargs)
etisserant@231: StartPLC = PyroCatcher(_PyroStartPLC, False)
etisserant@231:
etisserant@231:
etisserant@231: def _PyroGetTraceVariables(self):
etisserant@231: """
etisserant@231: for safe use in from debug thread, must use the copy
etisserant@231: """
etisserant@235: if RemotePLCObjectProxyCopy.GetPLCstatus() == "Started":
etisserant@235: return RemotePLCObjectProxyCopy.GetTraceVariables()
etisserant@235: else:
etisserant@235: return None,None
etisserant@231: GetTraceVariables = PyroCatcher(_PyroGetTraceVariables)
etisserant@231:
etisserant@203:
etisserant@203: def __getattr__(self, attrName):
etisserant@231: member = self.__dict__.get(attrName, None)
etisserant@231: if member is None:
etisserant@231: def my_local_func(*args,**kwargs):
etisserant@231: return RemotePLCObjectProxy.__getattr__(attrName)(*args,**kwargs)
etisserant@231: member = PyroCatcher(my_local_func, None)
etisserant@203: self.__dict__[attrName] = member
etisserant@231: return member
etisserant@231:
etisserant@203: return PyroProxyProxy()
etisserant@203:
etisserant@203: