runtime/ServicePublisher.py
author Laurent Bessard
Mon, 11 Mar 2013 14:04:48 +0100
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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#This file is part of Beremiz, a Integrated Development Environment for
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#programming IEC 61131-3 automates supporting plcopen standard and CanFestival. 
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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 socket, threading
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from util import Zeroconf
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service_type = '_PYRO._tcp.local.'
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class ServicePublisher():
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    def __init__(self):
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        # type: fully qualified service type name
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        self.serviceproperties = {'description':'Beremiz remote PLC'}
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        self.name = None
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        self.ip_32b = None
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        self.port = None
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        self.server = None
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        self.service_name = None
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        self.retrytimer = None
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    def RegisterService(self, name, ip, port):
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        try:
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            self._RegisterService(name, ip, port)
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        except Exception,e:
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            self.retrytimer = threading.Timer(2,self.RegisterService,[name, ip, port])
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            self.retrytimer.start() 
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    def _RegisterService(self, name, ip, port):
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        # name: fully qualified service name
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        self.service_name = 'Beremiz_%s.%s'%(name,service_type)
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        self.name = name
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        self.port = port
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        self.server = Zeroconf.Zeroconf(ip)
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        print "MDNS brodcasting on :"+ip
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        if ip == "0.0.0.0":
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            ip = self.gethostaddr()
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        print "MDNS brodcasted service address :"+ip
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        self.ip_32b = socket.inet_aton(ip)
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        self.server.registerService(
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             Zeroconf.ServiceInfo(service_type,
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                                  self.service_name,
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                                  self.ip_32b,
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                                  self.port,
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                                  properties = self.serviceproperties))
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        self.retrytimer=None
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    def UnRegisterService(self):
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        if self.retrytimer is not None:
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            self.retrytimer.cancel()
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        self.server.unregisterService(
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                                      Zeroconf.ServiceInfo(service_type, 
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                                                           self.service_name, 
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                                                           self.ip_32b, 
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                                                           self.port, 
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                                                           properties = self.serviceproperties))
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        self.server.close()
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        self.server = None
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    def gethostaddr(self, dst = '224.0.1.41'):
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        s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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        try:
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            s.connect((dst, 7))
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            (host, port) = s.getsockname()
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            s.close()
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            if host != '0.0.0.0':
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                return host
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        except Exception,e:
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            pass
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        return socket.gethostbyname(socket.gethostname())