Edouard@647: #!/usr/bin/env python
Edouard@647: # -*- coding: utf-8 -*-
Edouard@647: 
andrej@1667: # This file is part of Beremiz runtime.
Edouard@647: #
andrej@1571: # Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD
Edouard@647: #
andrej@1667: # See COPYING.Runtime file for copyrights details.
Edouard@647: #
andrej@1667: # This library is free software; you can redistribute it and/or
andrej@1667: # modify it under the terms of the GNU Lesser General Public
andrej@1667: # License as published by the Free Software Foundation; either
andrej@1667: # version 2.1 of the License, or (at your option) any later version.
andrej@1667: 
andrej@1667: # This library is distributed in the hope that it will be useful,
andrej@1571: # but WITHOUT ANY WARRANTY; without even the implied warranty of
andrej@1667: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
andrej@1667: # Lesser General Public License for more details.
andrej@1667: 
andrej@1667: # You should have received a copy of the GNU Lesser General Public
andrej@1667: # License along with this library; if not, write to the Free Software
andrej@1667: # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
Edouard@647: 
andrej@1826: 
andrej@1881: from __future__ import absolute_import
andrej@1826: from __future__ import print_function
andrej@1732: import socket
andrej@1732: import threading
andrej@1830: import zeroconf
Edouard@647: 
Edouard@763: service_type = '_PYRO._tcp.local.'
Edouard@763: 
andrej@1736: 
andrej@1831: class ServicePublisher(object):
Edouard@647:     def __init__(self):
Edouard@647:         # type: fully qualified service type name
andrej@1740:         self.serviceproperties = {'description': 'Beremiz remote PLC'}
andrej@1730: 
Edouard@647:         self.name = None
Edouard@647:         self.ip_32b = None
Edouard@647:         self.port = None
Edouard@647:         self.server = None
Edouard@647:         self.service_name = None
Edouard@647:         self.retrytimer = None
andrej@1730: 
Edouard@647:     def RegisterService(self, name, ip, port):
Edouard@647:         try:
Edouard@647:             self._RegisterService(name, ip, port)
andrej@1846:         except Exception:
andrej@1740:             self.retrytimer = threading.Timer(2, self.RegisterService, [name, ip, port])
andrej@1730:             self.retrytimer.start()
Edouard@647: 
Edouard@647:     def _RegisterService(self, name, ip, port):
Edouard@647:         # name: fully qualified service name
andrej@1740:         self.service_name = 'Beremiz_%s.%s' % (name, service_type)
Edouard@647:         self.name = name
Edouard@647:         self.port = port
Edouard@647: 
andrej@1830:         self.server = zeroconf.Zeroconf()
andrej@1826:         print("MDNS brodcasting on :" + ip)
Edouard@647: 
Edouard@648:         if ip == "0.0.0.0":
Edouard@648:             ip = self.gethostaddr()
andrej@1826:         print("MDNS brodcasted service address :" + ip)
Edouard@647:         self.ip_32b = socket.inet_aton(ip)
Edouard@647: 
andrej@1830:         self.server.register_service(
andrej@1878:             zeroconf.ServiceInfo(service_type,
andrej@1878:                                  self.service_name,
andrej@1878:                                  self.ip_32b,
andrej@1878:                                  self.port,
andrej@1878:                                  properties=self.serviceproperties))
andrej@1742:         self.retrytimer = None
andrej@1730: 
Edouard@647:     def UnRegisterService(self):
Edouard@647:         if self.retrytimer is not None:
Edouard@647:             self.retrytimer.cancel()
Edouard@647: 
andrej@1830:         if self.server is not None:
andrej@1830:             self.server.unregister_service(
andrej@1830:                 zeroconf.ServiceInfo(service_type,
andrej@1830:                                      self.service_name,
andrej@1830:                                      self.ip_32b,
andrej@1830:                                      self.port,
andrej@1830:                                      properties=self.serviceproperties))
andrej@1830:             self.server.close()
andrej@1830:             self.server = None
andrej@1730: 
andrej@1744:     def gethostaddr(self, dst='224.0.1.41'):
Edouard@647:         s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
Edouard@647:         try:
Edouard@647:             s.connect((dst, 7))
andrej@1847:             (host, _port) = s.getsockname()
Edouard@647:             s.close()
Edouard@647:             if host != '0.0.0.0':
Edouard@647:                 return host
andrej@1846:         except Exception:
Edouard@647:             pass
Edouard@647:         return socket.gethostbyname(socket.gethostname())