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: