runtime/PyroServer.py
author Edouard Tisserant
Tue, 13 Jul 2021 16:19:07 +0200
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SVGHMI: Widget lib: small doc fix.
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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 runtime.
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# Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD
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# Copyright (C) 2017: Andrey Skvortsov
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# Copyright (C) 2018: Edouard TISSERANT
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# See COPYING file for copyrights details.
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from __future__ import absolute_import
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from __future__ import print_function
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import sys
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import os
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import Pyro
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import Pyro.core as pyro
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import runtime
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from runtime.ServicePublisher import ServicePublisher
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class PyroServer(object):
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    def __init__(self, servicename, ip_addr, port):
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        self.continueloop = True
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        self.daemon = None
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        self.servicename = servicename
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        self.ip_addr = ip_addr
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        self.port = port
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        self.servicepublisher = None
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        self.piper, self.pipew = None, None
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    def _to_be_published(self):
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        return self.servicename is not None and \
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               self.ip_addr not in ["", "localhost", "127.0.0.1"]
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    def PrintServerInfo(self):
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        print(_("Pyro port :"), self.port)
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        if self._to_be_published():
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            print(_("Publishing service on local network"))
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        sys.stdout.flush()
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    def PyroLoop(self, when_ready):
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        if self._to_be_published():
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            self.Publish()
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        while self.continueloop:
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            Pyro.config.PYRO_MULTITHREADED = 0
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            pyro.initServer()
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            self.daemon = pyro.Daemon(host=self.ip_addr, port=self.port)
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            # pyro never frees memory after connection close if no timeout set
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            # taking too small timeout value may cause
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            # unwanted diconnection when IDE is kept busy for long periods
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            self.daemon.setTimeout(60)
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            pyro_obj = Pyro.core.ObjBase()
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            pyro_obj.delegateTo(runtime.GetPLCObjectSingleton())
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            self.daemon.connect(pyro_obj, "PLCObject")
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            when_ready()
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            self.piper, self.pipew = os.pipe()
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            self.daemon.requestLoop(others=[self.piper], callback=lambda x: None)
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            self.piper, self.pipew = None, None
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            if hasattr(self, 'sock'):
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                self.daemon.sock.close()
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        self.Unpublish()
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    def Restart(self):
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        self.daemon.shutdown(True)
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    def Quit(self):
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        self.continueloop = False
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        self.daemon.shutdown(True)
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        self.daemon.closedown()
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        if self.pipew is not None:
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            os.write(self.pipew, "goodbye")
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    def Publish(self):
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        self.servicepublisher = ServicePublisher("PYRO")
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        self.servicepublisher.RegisterService(self.servicename,
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                                              self.ip_addr, self.port)
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    def Unpublish(self):
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        if self.servicepublisher is not None:
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            self.servicepublisher.UnRegisterService()
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            self.servicepublisher = None