runtime/NevowServer.py
author Andrey Skvortsov <andrej.skvortzov@gmail.com>
Mon, 14 Aug 2017 21:20:32 +0300
changeset 1732 94ffe74e6895
parent 1682 496029f768d9
child 1736 7e61baa047f0
permissions -rw-r--r--
clean-up: fix PEP8 E401 multiple imports on one line
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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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#
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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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#
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# See COPYING.Runtime file for copyrights details.
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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# Lesser General Public License for more details.
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
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import os
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import util.paths as paths
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from nevow import rend, appserver, inevow, tags, loaders, athena
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from nevow.page import renderer
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from twisted.python import util
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from twisted.internet import reactor
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xhtml_header = '''<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
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"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
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'''
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WorkingDir = None
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class PLCHMI(athena.LiveElement):
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    initialised = False
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    def HMIinitialised(self, result):
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        self.initialised = True
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    def HMIinitialisation(self):
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        self.HMIinitialised(None)
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class DefaultPLCStartedHMI(PLCHMI):
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    docFactory = loaders.stan(tags.div(render=tags.directive('liveElement'))[
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                                            tags.h1["PLC IS NOW STARTED"],
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                                            ])
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class PLCStoppedHMI(PLCHMI):
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    docFactory = loaders.stan(tags.div(render=tags.directive('liveElement'))[
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                                            tags.h1["PLC IS STOPPED"],
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                                            ])
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class MainPage(athena.LiveElement):
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    jsClass = u"WebInterface.PLC"
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    docFactory = loaders.stan(tags.div(render=tags.directive('liveElement'))[
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                                                    tags.div(id='content')[
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                                                    tags.div(render = tags.directive('PLCElement')),
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                                                    ]])
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    def __init__(self, *a, **kw):
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        athena.LiveElement.__init__(self, *a, **kw)
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        self.pcl_state = False
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        self.HMI = None
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        self.resetPLCStartedHMI()
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    def setPLCState(self, state):
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        self.pcl_state = state
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        if self.HMI is not None:
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            self.callRemote('updateHMI')
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    def setPLCStartedHMI(self, hmi):
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        self.PLCStartedHMIClass = hmi
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    def resetPLCStartedHMI(self):
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        self.PLCStartedHMIClass = DefaultPLCStartedHMI
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    def getHMI(self):
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        return self.HMI
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    def HMIexec(self, function, *args, **kwargs):
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        if self.HMI is not None:
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            getattr(self.HMI, function, lambda:None)(*args, **kwargs)
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    athena.expose(HMIexec)
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    def resetHMI(self):
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        self.HMI = None
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    def PLCElement(self, ctx, data):
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        return self.getPLCElement()
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    renderer(PLCElement)
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    def getPLCElement(self):
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        self.detachFragmentChildren()
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        if self.pcl_state:
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            f = self.PLCStartedHMIClass()
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        else:
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            f = PLCStoppedHMI()
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        f.setFragmentParent(self)
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        self.HMI = f
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        return f
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    athena.expose(getPLCElement)
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    def detachFragmentChildren(self):
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        for child in self.liveFragmentChildren[:]:
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            child.detach()
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class WebInterface(athena.LivePage):
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    docFactory = loaders.stan([tags.raw(xhtml_header),
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                                tags.html(xmlns="http://www.w3.org/1999/xhtml")[
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                                    tags.head(render=tags.directive('liveglue')),
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                                    tags.body[
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                                        tags.div[
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                                                tags.div( render = tags.directive( "MainPage" ))
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                                                ]]]])
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    MainPage = MainPage()
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    PLCHMI = PLCHMI
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    def __init__(self, plcState=False, *a, **kw):
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        super(WebInterface, self).__init__(*a, **kw)
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        self.jsModules.mapping[u'WebInterface'] = paths.AbsNeighbourFile(__file__, 'webinterface.js')
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        self.plcState = plcState
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        self.MainPage.setPLCState(plcState)
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    def getHMI(self):
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        return self.MainPage.getHMI()
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    def LoadHMI(self, hmi, jsmodules):
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        for name, path in jsmodules.iteritems():
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            self.jsModules.mapping[name] = os.path.join(WorkingDir, path)
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        self.MainPage.setPLCStartedHMI(hmi)
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    def UnLoadHMI(self):
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        self.MainPage.resetPLCStartedHMI()
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    def PLCStarted(self):
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        self.plcState = True
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        self.MainPage.setPLCState(True)
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    def PLCStopped(self):
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        self.plcState = False
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        self.MainPage.setPLCState(False)
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    def renderHTTP(self, ctx):
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        """
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        Force content type to fit with SVG
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        """
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        req = inevow.IRequest(ctx)
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        req.setHeader('Content-type', 'application/xhtml+xml')
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        return super(WebInterface, self).renderHTTP(ctx)
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    def render_MainPage(self, ctx, data):
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        f = self.MainPage
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        f.setFragmentParent(self)
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        return ctx.tag[f]
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    def child_(self, ctx):
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        self.MainPage.detachFragmentChildren()
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        return WebInterface(plcState=self.plcState)
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    def beforeRender(self, ctx):
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        d = self.notifyOnDisconnect()
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        d.addErrback(self.disconnected)
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    def disconnected(self, reason):
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        self.MainPage.resetHMI()
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        #print reason
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        #print "We will be called back when the client disconnects"
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def RegisterWebsite(port):
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    website = WebInterface()
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    site = appserver.NevowSite(website)
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    listening = False
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    reactor.listenTCP(port, site)
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    print _("HTTP interface port :"), port
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    return website
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class statuslistener:
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    def __init__(self, site):
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        self.oldstate = None
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        self.site = site
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    def listen(self, state):
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        if state != self.oldstate:
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            action = {'Started': self.site.PLCStarted,
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                      'Stopped': self.site.PLCStopped}.get(state, None)
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            if action is not None: action ()
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            self.oldstate = state
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def website_statuslistener_factory(site):
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    return statuslistener(site).listen