author | greg |
Thu, 15 Oct 2009 17:39:26 +0200 | |
changeset 418 | 01f6bfc01251 |
parent 411 | 8261c8f1e365 |
child 446 | 1edde533db19 |
permissions | -rwxr-xr-x |
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#!/usr/bin/env python |
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# -*- coding: utf-8 -*- |
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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 library is free software; you can redistribute it and/or |
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#modify it under the terms of the GNU General Public |
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#License as published by the Free Software Foundation; either |
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#version 2.1 of the License, or (at your option) any later version. |
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# |
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#This library 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 GNU |
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#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 |
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#License along with this library; if not, write to the Free Software |
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#Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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import Pyro.core as pyro |
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from Pyro.errors import PyroError |
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import traceback |
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from time import sleep |
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import copy |
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# this module attribute contains a list of DNS-SD (Zeroconf) service types |
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# supported by this connector plugin. |
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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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supported_dnssd_services = ["_PYRO._tcp.local."] |
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def PYRO_connector_factory(uri, pluginsroot): |
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""" |
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This returns the connector to Pyro style PLCobject |
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""" |
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pluginsroot.logger.write(_("Connecting to URI : %s\n")%uri) |
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servicetype, location = uri.split("://") |
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# Try to get the proxy object |
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try : |
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RemotePLCObjectProxy = pyro.getAttrProxyForURI("PYROLOC://"+location+"/PLCObject") |
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except Exception, msg: |
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pluginsroot.logger.write_error(_("Wrong URI, please check it !\n")) |
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pluginsroot.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 defaul 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 PyroError,e: |
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#pluginsroot.logger.write_error(traceback.format_exc()) |
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pluginsroot.logger.write_error(str(e)+"\n") |
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pluginsroot._connector = 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(lambda:RemotePLCObjectProxy.GetPLCstatus())() == None: |
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pluginsroot.logger.write_error(_("Cannot get PLC status - connection failed.\n")) |
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return None |
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class PyroProxyProxy: |
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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 __init__(self): |
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# for safe use in from debug thread, must create a copy |
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self.RemotePLCObjectProxyCopy = None |
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def GetPyroProxy(self): |
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""" |
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This func returns the real Pyro Proxy. |
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Use this if you musn't keep reference to it. |
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""" |
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return RemotePLCObjectProxy |
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def _PyroStartPLC(self, *args, **kwargs): |
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""" |
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pluginsroot._connector.GetPyroProxy() is used |
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rather than RemotePLCObjectProxy because |
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object is recreated meanwhile, |
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so we must not keep ref to it here |
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""" |
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if pluginsroot._connector.GetPyroProxy().GetPLCstatus() == "Dirty": |
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""" |
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Some bad libs with static symbols may polute PLC |
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ask runtime to suicide and come back again |
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""" |
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pluginsroot.logger.write(_("Force runtime reload\n")) |
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pluginsroot._connector.GetPyroProxy().ForceReload() |
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pluginsroot._Disconnect() |
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# let remote PLC time to resurect.(freeze app) |
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sleep(0.5) |
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pluginsroot._Connect() |
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self.RemotePLCObjectProxyCopy = copy.copy(pluginsroot._connector.GetPyroProxy()) |
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return pluginsroot._connector.GetPyroProxy().StartPLC(*args, **kwargs) |
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StartPLC = PyroCatcher(_PyroStartPLC, False) |
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def _PyroGetTraceVariables(self): |
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""" |
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for safe use in from debug thread, must use the copy |
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""" |
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if self.RemotePLCObjectProxyCopy is not None and self.RemotePLCObjectProxyCopy.GetPLCstatus() == "Started": |
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return self.RemotePLCObjectProxyCopy.GetTraceVariables() |
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else: |
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return None,None |
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GetTraceVariables = PyroCatcher(_PyroGetTraceVariables,(None,None)) |
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def _PyroPLCIsStarting(self): |
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""" |
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for safe use in from debug thread, must use the copy |
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""" |
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return self.RemotePLCObjectProxyCopy is not None and self.RemotePLCObjectProxyCopy.GetPLCstatus() == "Starting" |
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PLCIsStarting = PyroCatcher(_PyroPLCIsStarting,False) |
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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, None) |
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self.__dict__[attrName] = member |
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return member |
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return PyroProxyProxy() |
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