runtime/ServicePublisher.py
author Edouard Tisserant
Sun, 27 Oct 2019 22:28:51 +0100
branchsvghmi
changeset 2806 7d0e81cdedb0
parent 2492 7dd551ac2fa0
child 3750 f62625418bff
permissions -rw-r--r--
SVGHMI: Quicker update path for input widget when pressing on buttons, do not wait until data comes back, and simply update value text of the pressed widget. Updated PLC prog for more amimated value to display
#!/usr/bin/env python
# -*- coding: utf-8 -*-

# This file is part of Beremiz runtime.
#
# Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD
#
# See COPYING.Runtime file for copyrights details.
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser 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
# Lesser General Public License for more details.

# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA


from __future__ import absolute_import
from __future__ import print_function
import socket
import threading
import zeroconf


service_type = '_Beremiz._tcp.local.'


class ServicePublisher(object):
    def __init__(self, protocol):
        # type: fully qualified service type name
        self.serviceproperties = {
            'description': 'Beremiz remote PLC',
            'protocol': protocol
        }

        self.name = None
        self.ip_32b = None
        self.port = None
        self.server = None
        self.service_name = None
        self.retrytimer = None

    def RegisterService(self, name, ip, port):
        try:
            self._RegisterService(name, ip, port)
        except Exception:
            self.retrytimer = threading.Timer(2, self.RegisterService, [name, ip, port])
            self.retrytimer.start()

    def _RegisterService(self, name, ip, port):
        # name: fully qualified service name
        self.service_name = '%s.%s' % (name, service_type)
        self.name = name
        self.port = port

        if ip == "0.0.0.0":
            print("MDNS brodcasted on all interfaces")
            interfaces = zeroconf.InterfaceChoice.All
            ip = self.gethostaddr()
        else:
            interfaces = [ip]

        self.server = zeroconf.Zeroconf(interfaces=interfaces)

        print("MDNS brodcasted service address :" + ip)
        self.ip_32b = socket.inet_aton(ip)

        self.server.register_service(
            zeroconf.ServiceInfo(service_type,
                                 self.service_name,
                                 self.ip_32b,
                                 self.port,
                                 properties=self.serviceproperties))
        self.retrytimer = None

    def UnRegisterService(self):
        if self.retrytimer is not None:
            self.retrytimer.cancel()

        if self.server is not None:
            self.server.unregister_service(
                zeroconf.ServiceInfo(service_type,
                                     self.service_name,
                                     self.ip_32b,
                                     self.port,
                                     properties=self.serviceproperties))
            self.server.close()
            self.server = None

    def gethostaddr(self, dst='224.0.1.41'):
        s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        try:
            s.connect((dst, 7))
            (host, _port) = s.getsockname()
            s.close()
            if host != '0.0.0.0':
                return host
        except Exception:
            pass
        return socket.gethostbyname(socket.gethostname())