Added stub code for runtime WAMP client. Added runtime command line switch to select WAMP url and Nevow web site port. Web port is now fixed, next port number is not tested if bind fails.
#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
#Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD
#
#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 Pyro.core as pyro
from Pyro.errors import PyroError
import Pyro.util
import traceback
from time import sleep
import copy
import socket
service_type = '_PYRO._tcp.local.'
# this module attribute contains a list of DNS-SD (Zeroconf) service types
# supported by this connector confnode.
#
# for connectors that do not support DNS-SD, this attribute can be omitted
# or set to an empty list.
def PYRO_connector_factory(uri, confnodesroot):
"""
This returns the connector to Pyro style PLCobject
"""
confnodesroot.logger.write(_("Connecting to URI : %s\n")%uri)
servicetype, location = uri.split("://")
if location.find(service_type) != -1:
try :
from util.Zeroconf import Zeroconf
r = Zeroconf()
i=r.getServiceInfo(service_type, location)
if i is None : raise Exception, "'%s' not found"%location
ip = str(socket.inet_ntoa(i.getAddress()))
port = str(i.getPort())
newlocation = ip+':'+port
confnodesroot.logger.write(_("'%s' is located at %s\n")%(location, newlocation))
location = newlocation
r.close()
except Exception, msg:
confnodesroot.logger.write_error(_("MDNS resolution failure for '%s'\n")%location)
confnodesroot.logger.write_error(traceback.format_exc())
return None
# Try to get the proxy object
try :
RemotePLCObjectProxy = pyro.getAttrProxyForURI("PYROLOC://"+location+"/PLCObject")
except Exception, msg:
confnodesroot.logger.write_error(_("Connection to '%s' failed.\n")%location)
confnodesroot.logger.write_error(traceback.format_exc())
return None
def PyroCatcher(func, default=None):
"""
A function that catch a pyro exceptions, write error to logger
and return defaul value when it happen
"""
def catcher_func(*args,**kwargs):
try:
return func(*args,**kwargs)
except Pyro.errors.ConnectionClosedError, e:
confnodesroot.logger.write_error("Connection lost!\n")
confnodesroot._SetConnector(None)
except Pyro.errors.ProtocolError, e:
confnodesroot.logger.write_error("Pyro exception: "+str(e)+"\n")
except Exception,e:
#confnodesroot.logger.write_error(traceback.format_exc())
errmess = ''.join(Pyro.util.getPyroTraceback(e))
confnodesroot.logger.write_error(errmess+"\n")
print errmess
confnodesroot._SetConnector(None)
return default
return catcher_func
# Check connection is effective.
# lambda is for getattr of GetPLCstatus to happen inside catcher
if PyroCatcher(lambda:RemotePLCObjectProxy.GetPLCstatus())() is None:
confnodesroot.logger.write_error(_("Cannot get PLC status - connection failed.\n"))
return None
class PyroProxyProxy:
"""
A proxy proxy class to handle Beremiz Pyro interface specific behavior.
And to put pyro exception catcher in between caller and pyro proxy
"""
def __init__(self):
# for safe use in from debug thread, must create a copy
self.RemotePLCObjectProxyCopy = None
def GetPyroProxy(self):
"""
This func returns the real Pyro Proxy.
Use this if you musn't keep reference to it.
"""
return RemotePLCObjectProxy
def _PyroStartPLC(self, *args, **kwargs):
"""
confnodesroot._connector.GetPyroProxy() is used
rather than RemotePLCObjectProxy because
object is recreated meanwhile,
so we must not keep ref to it here
"""
current_status, log_count = confnodesroot._connector.GetPyroProxy().GetPLCstatus()
if current_status == "Dirty":
"""
Some bad libs with static symbols may polute PLC
ask runtime to suicide and come back again
"""
confnodesroot.logger.write(_("Force runtime reload\n"))
confnodesroot._connector.GetPyroProxy().ForceReload()
confnodesroot._Disconnect()
# let remote PLC time to resurect.(freeze app)
sleep(0.5)
confnodesroot._Connect()
self.RemotePLCObjectProxyCopy = copy.copy(confnodesroot._connector.GetPyroProxy())
return confnodesroot._connector.GetPyroProxy().StartPLC(*args, **kwargs)
StartPLC = PyroCatcher(_PyroStartPLC, False)
def _PyroGetTraceVariables(self):
"""
for safe use in from debug thread, must use the copy
"""
if self.RemotePLCObjectProxyCopy is None:
self.RemotePLCObjectProxyCopy = copy.copy(confnodesroot._connector.GetPyroProxy())
return self.RemotePLCObjectProxyCopy.GetTraceVariables()
GetTraceVariables = PyroCatcher(_PyroGetTraceVariables,("Broken",None))
def _PyroGetPLCstatus(self):
return RemotePLCObjectProxy.GetPLCstatus()
GetPLCstatus = PyroCatcher(_PyroGetPLCstatus, ("Broken",None))
def _PyroRemoteExec(self, script, **kwargs):
return RemotePLCObjectProxy.RemoteExec(script, **kwargs)
RemoteExec = PyroCatcher(_PyroRemoteExec, (-1, "RemoteExec script failed!"))
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 = PyroCatcher(my_local_func, None)
self.__dict__[attrName] = member
return member
return PyroProxyProxy()