1

#!/usr/bin/env python

     2

# -*- coding: utf-8 -*-

     3

     4

# This file is part of Beremiz runtime.

     5

#

     6

# Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD

     7

#

     8

# See COPYING.Runtime file for copyrights details.

     9

#

    10

# This library is free software; you can redistribute it and/or

    11

# modify it under the terms of the GNU Lesser General Public

    12

# License as published by the Free Software Foundation; either

    13

# version 2.1 of the License, or (at your option) any later version.

    14

    15

# This library is distributed in the hope that it will be useful,

    16

# but WITHOUT ANY WARRANTY; without even the implied warranty of

    17

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    18

# Lesser General Public License for more details.

    19

    20

# You should have received a copy of the GNU Lesser General Public

    21

# License along with this library; if not, write to the Free Software

    22

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

    23

    24

    25

from __future__ import absolute_import

    26

from __future__ import print_function

    27

import socket

    28

import threading

    29

import zeroconf

    30

    31

service_type = '_PYRO._tcp.local.'

    32

    33

    34

class ServicePublisher(object):

    35

    def __init__(self):

    36

        # type: fully qualified service type name

    37

        self.serviceproperties = {'description': 'Beremiz remote PLC'}

    38

    39

        self.name = None

    40

        self.ip_32b = None

    41

        self.port = None

    42

        self.server = None

    43

        self.service_name = None

    44

        self.retrytimer = None

    45

    46

    def RegisterService(self, name, ip, port):

    47

        try:

    48

            self._RegisterService(name, ip, port)

    49

        except Exception:

    50

            self.retrytimer = threading.Timer(2, self.RegisterService, [name, ip, port])

    51

            self.retrytimer.start()

    52

    53

    def _RegisterService(self, name, ip, port):

    54

        # name: fully qualified service name

    55

        self.service_name = 'Beremiz_%s.%s' % (name, service_type)

    56

        self.name = name

    57

        self.port = port

    58

    65

    68

        print("MDNS brodcasted service address :" + ip)

    69

        self.ip_32b = socket.inet_aton(ip)

    70

    71

        self.server.register_service(

    72

            zeroconf.ServiceInfo(service_type,

    73

                                 self.service_name,

    74

                                 self.ip_32b,

    75

                                 self.port,

    76

                                 properties=self.serviceproperties))

    77

        self.retrytimer = None

    78

    79

    def UnRegisterService(self):

    80

        if self.retrytimer is not None:

    81

            self.retrytimer.cancel()

    82

    83

        if self.server is not None:

    84

            self.server.unregister_service(

    85

                zeroconf.ServiceInfo(service_type,

    86

                                     self.service_name,

    87

                                     self.ip_32b,

    88

                                     self.port,

    89

                                     properties=self.serviceproperties))

    90

            self.server.close()

    91

            self.server = None

    92

    93

    def gethostaddr(self, dst='224.0.1.41'):

    94

        s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

    95

        try:

    96

            s.connect((dst, 7))

    97

            (host, _port) = s.getsockname()

    98

            s.close()

    99

            if host != '0.0.0.0':

   100

                return host

   101

        except Exception:

   102

            pass

   103

        return socket.gethostbyname(socket.gethostname())