runtime/ServicePublisher.py
author Edouard Tisserant
Thu, 25 Mar 2021 10:13:12 +0100
branchsvghmi
changeset 3199 1582753e409b
parent 2492 7dd551ac2fa0
child 3750 f62625418bff
permissions -rw-r--r--
SVGHMI: Filter unseen geometry from inkscape CSV output.

When inkscape exports geometry form all objects, then it also includes objects from svg:defs. This makes problems when deciding if an object is part of a page, since coordinate of objects in svg:defs can eventualy be contained in a page. In the end, those objects where getting detached when leaving pages where they where found, leading for exemple to non working text on clipping when the clipped text was cloned in multiple page.
#!/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())