def _initialize_subsystems(self):
        notification_center = NotificationCenter()

        with self._lock:
            stop_pending = self._stop_pending
            if stop_pending:
                self.state = 'stopping'
        if stop_pending:
            notification_center.post_notification('SIPApplicationWillEnd',
                                                  sender=self)
            # stop the subsystems we already started: threads, engine and reactor
            self.engine.stop()
            self.engine.join(timeout=5)
            thread_manager = ThreadManager()
            thread_manager.stop()
            reactor.stop()
            return

        account_manager = AccountManager()
        addressbook_manager = AddressbookManager()
        dns_manager = DNSManager()
        session_manager = SessionManager()
        settings = SIPSimpleSettings()

        xcap_client.DEFAULT_HEADERS = {'User-Agent': settings.user_agent}

        # initialize TLS
        self._initialize_tls()

        # initialize PJSIP internal resolver
        self.engine.set_nameservers(dns_manager.nameservers)

        # initialize audio objects
        alert_device = settings.audio.alert_device
        if alert_device not in (
                None, 'system_default'
        ) and alert_device not in self.engine.output_devices:
            alert_device = 'system_default'
        input_device = settings.audio.input_device
        if input_device not in (
                None, 'system_default'
        ) and input_device not in self.engine.input_devices:
            input_device = 'system_default'
        output_device = settings.audio.output_device
        if output_device not in (
                None, 'system_default'
        ) and output_device not in self.engine.output_devices:
            output_device = 'system_default'
        tail_length = settings.audio.echo_canceller.tail_length if settings.audio.echo_canceller.enabled else 0
        voice_mixer = AudioMixer(input_device, output_device,
                                 settings.audio.sample_rate, tail_length)
        voice_mixer.muted = settings.audio.muted
        self.voice_audio_device = AudioDevice(voice_mixer)
        self.voice_audio_bridge = RootAudioBridge(voice_mixer)
        self.voice_audio_bridge.add(self.voice_audio_device)
        alert_mixer = AudioMixer(None, alert_device,
                                 settings.audio.sample_rate, 0)
        if settings.audio.silent:
            alert_mixer.output_volume = 0
        self.alert_audio_device = AudioDevice(alert_mixer)
        self.alert_audio_bridge = RootAudioBridge(alert_mixer)
        self.alert_audio_bridge.add(self.alert_audio_device)

        settings.audio.input_device = voice_mixer.input_device
        settings.audio.output_device = voice_mixer.output_device
        settings.audio.alert_device = alert_mixer.output_device

        # initialize video
        self.video_device = VideoDevice(settings.video.device,
                                        settings.video.resolution,
                                        settings.video.framerate)
        self.video_device.muted = settings.video.muted
        settings.video.device = self.video_device.name
        self.engine.set_video_options(settings.video.resolution,
                                      settings.video.framerate,
                                      settings.video.max_bitrate)
        self.engine.set_h264_options(settings.video.h264.profile,
                                     settings.video.h264.level)

        # initialize instance id
        if not settings.instance_id:
            settings.instance_id = uuid4().urn

        # initialize path for ZRTP cache file
        if ISIPSimpleApplicationDataStorage.providedBy(self.storage):
            self.engine.zrtp_cache = os.path.join(self.storage.directory,
                                                  'zrtp.db')

        # save settings in case something was modified during startup
        settings.save()

        # initialize middleware components
        dns_manager.start()
        account_manager.start()
        addressbook_manager.start()
        session_manager.start()

        notification_center.add_observer(self,
                                         name='CFGSettingsObjectDidChange')
        notification_center.add_observer(self, name='DNSNameserversDidChange')
        notification_center.add_observer(self, name='SystemIPAddressDidChange')
        notification_center.add_observer(self, name='SystemDidWakeUpFromSleep')

        with self._lock:
            self.state = 'started'
            stop_pending = self._stop_pending

        notification_center.post_notification('SIPApplicationDidStart',
                                              sender=self)

        if stop_pending:
            self.stop()
class SIPApplication(object, metaclass=Singleton):

    default_ip = None
    storage = ApplicationAttribute(value=None)
    engine = ApplicationAttribute(value=None)
    thread = ApplicationAttribute(value=None)

    state = ApplicationAttribute(value=None)

    alert_audio_device = ApplicationAttribute(value=None)
    alert_audio_bridge = ApplicationAttribute(value=None)
    voice_audio_device = ApplicationAttribute(value=None)
    voice_audio_bridge = ApplicationAttribute(value=None)

    video_device = ApplicationAttribute(value=None)

    _lock = ApplicationAttribute(value=RLock())
    _timer = ApplicationAttribute(value=None)
    _stop_pending = ApplicationAttribute(value=False)

    running = classproperty(lambda cls: cls.state == 'started')
    alert_audio_mixer = classproperty(lambda cls: cls.alert_audio_bridge.mixer
                                      if cls.alert_audio_bridge else None)
    voice_audio_mixer = classproperty(lambda cls: cls.voice_audio_bridge.mixer
                                      if cls.voice_audio_bridge else None)

    def start(self, storage):
        if not ISIPSimpleStorage.providedBy(storage):
            raise TypeError(
                "storage must implement the ISIPSimpleStorage interface")

        with self._lock:
            if self.state is not None:
                raise RuntimeError(
                    "SIPApplication cannot be started from '%s' state" %
                    self.state)
            self.state = 'starting'

        self.engine = Engine()
        self.storage = storage

        thread_manager = ThreadManager()
        thread_manager.start()

        configuration_manager = ConfigurationManager()
        addressbook_manager = AddressbookManager()
        account_manager = AccountManager()

        # load configuration and initialize core
        try:
            configuration_manager.start()
            SIPSimpleSettings()
            account_manager.load()
            addressbook_manager.load()
        except:
            self.engine = None
            self.state = None
            self.storage = None
            raise

        # run the reactor thread
        self.thread = Thread(name='Reactor Thread', target=self._run_reactor)
        self.thread.start()

    def stop(self):
        with self._lock:
            if self.state in (None, 'stopping', 'stopped'):
                return
            elif self.state == 'starting':
                self._stop_pending = True
                return
            self.state = 'stopping'
        notification_center = NotificationCenter()
        notification_center.post_notification('SIPApplicationWillEnd',
                                              sender=self)
        self._shutdown_subsystems()

    def _run_reactor(self):
        from eventlib.twistedutil import join_reactor
        del join_reactor  # imported for the side effect of making the twisted reactor green

        notification_center = NotificationCenter()

        notification_center.post_notification('SIPApplicationWillStart',
                                              sender=self)
        with self._lock:
            stop_pending = self._stop_pending
            if stop_pending:
                self.state = 'stopping'
        if stop_pending:
            notification_center.post_notification('SIPApplicationWillEnd',
                                                  sender=self)
        else:
            self._initialize_core()
            reactor.run(installSignalHandlers=False)
        with self._lock:
            self.state = 'stopped'
        notification_center.post_notification('SIPApplicationDidEnd',
                                              sender=self)

    def _initialize_core(self):
        notification_center = NotificationCenter()
        settings = SIPSimpleSettings()

        # initialize core
        options = dict(  # general
            user_agent=settings.user_agent,
            # SIP
            detect_sip_loops=True,
            udp_port=settings.sip.udp_port
            if 'udp' in settings.sip.transport_list else None,
            tcp_port=settings.sip.tcp_port
            if 'tcp' in settings.sip.transport_list else None,
            tls_port=None,
            # TLS
            tls_verify_server=False,
            tls_ca_file=None,
            tls_cert_file=None,
            tls_privkey_file=None,
            # rtp
            rtp_port_range=(settings.rtp.port_range.start,
                            settings.rtp.port_range.end),
            # audio
            codecs=list(settings.rtp.audio_codec_list),
            # video
            video_codecs=list(settings.rtp.video_codec_list),
            # logging
            log_level=settings.logs.pjsip_level
            if settings.logs.trace_pjsip else 0,
            trace_sip=settings.logs.trace_sip)
        notification_center.add_observer(self, sender=self.engine)
        self.engine.start(**options)

    def _initialize_tls(self):
        settings = SIPSimpleSettings()
        account_manager = AccountManager()
        account = account_manager.default_account
        if account is not None:
            try:
                self.engine.set_tls_options(
                    port=settings.sip.tls_port,
                    verify_server=account.tls.verify_server,
                    ca_file=settings.tls.ca_list.normalized
                    if settings.tls.ca_list else None,
                    cert_file=account.tls.certificate.normalized
                    if account.tls.certificate else None,
                    privkey_file=account.tls.certificate.normalized
                    if account.tls.certificate else None)
            except Exception as e:
                notification_center = NotificationCenter()
                notification_center.post_notification(
                    'SIPApplicationFailedToStartTLS',
                    sender=self,
                    data=NotificationData(error=e))

    @run_in_green_thread
    def _initialize_subsystems(self):
        notification_center = NotificationCenter()

        with self._lock:
            stop_pending = self._stop_pending
            if stop_pending:
                self.state = 'stopping'
        if stop_pending:
            notification_center.post_notification('SIPApplicationWillEnd',
                                                  sender=self)
            # stop the subsystems we already started: threads, engine and reactor
            self.engine.stop()
            self.engine.join(timeout=5)
            thread_manager = ThreadManager()
            thread_manager.stop()
            reactor.stop()
            return

        account_manager = AccountManager()
        addressbook_manager = AddressbookManager()
        dns_manager = DNSManager()
        session_manager = SessionManager()
        settings = SIPSimpleSettings()

        xcap_client.DEFAULT_HEADERS = {'User-Agent': settings.user_agent}

        # initialize TLS
        self._initialize_tls()

        # initialize PJSIP internal resolver
        self.engine.set_nameservers(dns_manager.nameservers)

        # initialize audio objects
        alert_device = settings.audio.alert_device
        if alert_device not in (
                None, 'system_default'
        ) and alert_device not in self.engine.output_devices:
            alert_device = 'system_default'
        input_device = settings.audio.input_device
        if input_device not in (
                None, 'system_default'
        ) and input_device not in self.engine.input_devices:
            input_device = 'system_default'
        output_device = settings.audio.output_device
        if output_device not in (
                None, 'system_default'
        ) and output_device not in self.engine.output_devices:
            output_device = 'system_default'
        tail_length = settings.audio.echo_canceller.tail_length if settings.audio.echo_canceller.enabled else 0
        voice_mixer = AudioMixer(input_device, output_device,
                                 settings.audio.sample_rate, tail_length)
        voice_mixer.muted = settings.audio.muted
        self.voice_audio_device = AudioDevice(voice_mixer)
        self.voice_audio_bridge = RootAudioBridge(voice_mixer)
        self.voice_audio_bridge.add(self.voice_audio_device)
        alert_mixer = AudioMixer(None, alert_device,
                                 settings.audio.sample_rate, 0)
        if settings.audio.silent:
            alert_mixer.output_volume = 0
        self.alert_audio_device = AudioDevice(alert_mixer)
        self.alert_audio_bridge = RootAudioBridge(alert_mixer)
        self.alert_audio_bridge.add(self.alert_audio_device)

        settings.audio.input_device = voice_mixer.input_device
        settings.audio.output_device = voice_mixer.output_device
        settings.audio.alert_device = alert_mixer.output_device

        # initialize video
        self.video_device = VideoDevice(settings.video.device,
                                        settings.video.resolution,
                                        settings.video.framerate)
        self.video_device.muted = settings.video.muted
        settings.video.device = self.video_device.name
        self.engine.set_video_options(settings.video.resolution,
                                      settings.video.framerate,
                                      settings.video.max_bitrate)
        self.engine.set_h264_options(settings.video.h264.profile,
                                     settings.video.h264.level)

        # initialize instance id
        if not settings.instance_id:
            settings.instance_id = uuid4().urn

        # initialize path for ZRTP cache file
        if ISIPSimpleApplicationDataStorage.providedBy(self.storage):
            self.engine.zrtp_cache = os.path.join(self.storage.directory,
                                                  'zrtp.db')

        # save settings in case something was modified during startup
        settings.save()

        # initialize middleware components
        dns_manager.start()
        account_manager.start()
        addressbook_manager.start()
        session_manager.start()

        notification_center.add_observer(self,
                                         name='CFGSettingsObjectDidChange')
        notification_center.add_observer(self, name='DNSNameserversDidChange')
        notification_center.add_observer(self, name='SystemIPAddressDidChange')
        notification_center.add_observer(self, name='SystemDidWakeUpFromSleep')

        with self._lock:
            self.state = 'started'
            stop_pending = self._stop_pending

        notification_center.post_notification('SIPApplicationDidStart',
                                              sender=self)

        if stop_pending:
            self.stop()

    @run_in_green_thread
    def _shutdown_subsystems(self):
        # cleanup internals
        if self._timer is not None and self._timer.active():
            self._timer.cancel()
        self._timer = None

        # shutdown middleware components
        dns_manager = DNSManager()
        account_manager = AccountManager()
        addressbook_manager = AddressbookManager()
        session_manager = SessionManager()
        procs = [
            proc.spawn(dns_manager.stop),
            proc.spawn(account_manager.stop),
            proc.spawn(addressbook_manager.stop),
            proc.spawn(session_manager.stop)
        ]
        proc.waitall(procs)

        # stop video device
        self.video_device.producer.close()

        # shutdown engine
        self.engine.stop()
        self.engine.join(timeout=5)

        # stop threads
        thread_manager = ThreadManager()
        thread_manager.stop()

        # stop the reactor
        reactor.stop()

    def _network_conditions_changed(self):
        if self.running and self._timer is None:

            def notify():
                if self.running:
                    settings = SIPSimpleSettings()
                    if 'tcp' in settings.sip.transport_list:
                        self.engine.set_tcp_port(None)
                        self.engine.set_tcp_port(settings.sip.tcp_port)
                    if 'tls' in settings.sip.transport_list:
                        self._initialize_tls()
                    notification_center = NotificationCenter()
                    _changed = []
                    if self.default_ip != Host.default_ip:
                        _changed.append('ip')
                    data = NotificationData(changed=_changed)
                    notification_center.post_notification(
                        'NetworkConditionsDidChange', sender=self, data=data)
                    self.default_ip = Host.default_ip
                self._timer = None

            self._timer = reactor.callLater(5, notify)

    @run_in_twisted_thread
    def handle_notification(self, notification):
        handler = getattr(self, '_NH_%s' % notification.name, Null)
        handler(notification)

    def _NH_SIPEngineDidStart(self, notification):
        self._initialize_subsystems()

    def _NH_SIPEngineDidFail(self, notification):
        with self._lock:
            if self.state == 'stopping':
                return
            self.state = 'stopping'
        notification.center.post_notification('SIPApplicationWillEnd',
                                              sender=self)
        #
        # In theory we need to stop the subsystems here, based on what subsystems are already running according to our state,
        # but in practice the majority of those subsystems need the engine even to stop and the engine has failed.
        #
        # Even the ThreadManager might have threads that try to execute operations on the engine, which could block indefinitely
        # waiting for an answer that will no longer arrive, thus blocking the ThreadManager stop operation.
        #
        # As a result the safest thing to do is to just stop the engine thread and the reactor, which means in this case we
        # will not cleanup properly (the engine thread should already have ended as a result of the failure, so stopping it
        # is technically a no-op).
        #
        self.engine.stop()
        self.engine.join(timeout=5)
        reactor.stop()

    def _NH_SIPEngineGotException(self, notification):
        notification.center.post_notification('SIPApplicationGotFatalError',
                                              sender=self,
                                              data=notification.data)

    @run_in_thread('device-io')
    def _NH_CFGSettingsObjectDidChange(self, notification):
        settings = SIPSimpleSettings()
        account_manager = AccountManager()

        try:
            if notification.sender is settings:
                if 'audio.sample_rate' in notification.data.modified:
                    alert_device = settings.audio.alert_device
                    if alert_device not in (
                            None, 'system_default'
                    ) and alert_device not in self.engine.output_devices:
                        alert_device = 'system_default'
                    input_device = settings.audio.input_device
                    if input_device not in (
                            None, 'system_default'
                    ) and input_device not in self.engine.input_devices:
                        input_device = 'system_default'
                    output_device = settings.audio.output_device
                    if output_device not in (
                            None, 'system_default'
                    ) and output_device not in self.engine.output_devices:
                        output_device = 'system_default'
                    tail_length = settings.audio.echo_canceller.tail_length if settings.audio.echo_canceller.enabled else 0
                    voice_mixer = AudioMixer(input_device, output_device,
                                             settings.audio.sample_rate,
                                             tail_length)
                    voice_mixer.muted = settings.audio.muted
                    self.voice_audio_device = AudioDevice(voice_mixer)
                    self.voice_audio_bridge = RootAudioBridge(voice_mixer)
                    self.voice_audio_bridge.add(self.voice_audio_device)
                    alert_mixer = AudioMixer(None, alert_device,
                                             settings.audio.sample_rate, 0)
                    self.alert_audio_device = AudioDevice(alert_mixer)
                    self.alert_audio_bridge = RootAudioBridge(alert_mixer)
                    self.alert_audio_bridge.add(self.alert_audio_device)
                    if settings.audio.silent:
                        alert_mixer.output_volume = 0
                    settings.audio.input_device = voice_mixer.input_device
                    settings.audio.output_device = voice_mixer.output_device
                    settings.audio.alert_device = alert_mixer.output_device
                    settings.save()
                else:
                    if {
                            'audio.input_device', 'audio.output_device',
                            'audio.alert_device',
                            'audio.echo_canceller.enabled',
                            'audio.echo_canceller.tail_length'
                    }.intersection(notification.data.modified):
                        input_device = settings.audio.input_device
                        if input_device not in (
                                None, 'system_default'
                        ) and input_device not in self.engine.input_devices:
                            input_device = 'system_default'
                        output_device = settings.audio.output_device
                        if output_device not in (
                                None, 'system_default'
                        ) and output_device not in self.engine.output_devices:
                            output_device = 'system_default'
                        tail_length = settings.audio.echo_canceller.tail_length if settings.audio.echo_canceller.enabled else 0
                        if (input_device, output_device,
                                tail_length) != attrgetter(
                                    'input_device', 'output_device',
                                    'ec_tail_length')(
                                        self.voice_audio_bridge.mixer):
                            self.voice_audio_bridge.mixer.set_sound_devices(
                                input_device, output_device, tail_length)
                            settings.audio.input_device = self.voice_audio_bridge.mixer.input_device
                            settings.audio.output_device = self.voice_audio_bridge.mixer.output_device
                            settings.save()
                        alert_device = settings.audio.alert_device
                        if alert_device not in (
                                None, 'system_default'
                        ) and alert_device not in self.engine.output_devices:
                            alert_device = 'system_default'
                        if alert_device != self.alert_audio_bridge.mixer.output_device:
                            self.alert_audio_bridge.mixer.set_sound_devices(
                                None, alert_device, 0)
                            settings.audio.alert_device = self.alert_audio_bridge.mixer.output_device
                            settings.save()
                    if 'audio.muted' in notification.data.modified:
                        self.voice_audio_bridge.mixer.muted = settings.audio.muted
                    if 'audio.silent' in notification.data.modified:
                        if settings.audio.silent:
                            self.alert_audio_bridge.mixer.output_volume = 0
                        else:
                            self.alert_audio_bridge.mixer.output_volume = 100
                if 'video.muted' in notification.data.modified:
                    self.video_device.muted = settings.video.muted
                if {'video.h264.profile', 'video.h264.level'
                    }.intersection(notification.data.modified):
                    self.engine.set_h264_options(settings.video.h264.profile,
                                                 settings.video.h264.level)
                if {
                        'video.device', 'video.resolution', 'video.framerate',
                        'video.max_bitrate'
                }.intersection(notification.data.modified):
                    if {'video.device', 'video.resolution', 'video.framerate'
                        }.intersection(
                            notification.data.modified
                        ) or settings.video.device != self.video_device.name:
                        self.video_device.set_camera(settings.video.device,
                                                     settings.video.resolution,
                                                     settings.video.framerate)
                        settings.video.device = self.video_device.name
                        settings.save()
                    self.engine.set_video_options(settings.video.resolution,
                                                  settings.video.framerate,
                                                  settings.video.max_bitrate)
                if 'user_agent' in notification.data.modified:
                    self.engine.user_agent = settings.user_agent
                if 'sip.udp_port' in notification.data.modified:
                    self.engine.set_udp_port(settings.sip.udp_port)
                if 'sip.tcp_port' in notification.data.modified:
                    self.engine.set_tcp_port(settings.sip.tcp_port)
                if {'sip.tls_port', 'tls.ca_list', 'default_account'
                    }.intersection(notification.data.modified):
                    self._initialize_tls()
                if 'rtp.port_range' in notification.data.modified:
                    self.engine.rtp_port_range = (
                        settings.rtp.port_range.start,
                        settings.rtp.port_range.end)
                if 'rtp.audio_codec_list' in notification.data.modified:
                    print(settings.rtp.audio_codec_list)
                    self.engine.codecs = list(
                        codec.encode()
                        for codec in settings.rtp.audio_codec_list)
                if 'rtp.video_codec_list' in notification.data.modified:
                    print(settings.rtp.video_codec_list)
                    self.engine.video_codecs = list(
                        codec.encode()
                        for codec in settings.rtp.video_codec_list)
                if 'logs.trace_sip' in notification.data.modified:
                    self.engine.trace_sip = settings.logs.trace_sip
                if {'logs.trace_pjsip', 'logs.pjsip_level'
                    }.intersection(notification.data.modified):
                    self.engine.log_level = settings.logs.pjsip_level if settings.logs.trace_pjsip else 0
            elif notification.sender is account_manager.default_account:
                if {'tls.verify_server', 'tls.certificate'
                    }.intersection(notification.data.modified):
                    self._initialize_tls()
        except (SIPCoreError, PJSIPError) as e:
            print('Error setting core option: %s' % str(e))

    @run_in_thread('device-io')
    def _NH_DefaultAudioDeviceDidChange(self, notification):
        if None in (self.voice_audio_bridge, self.alert_audio_bridge):
            return
        settings = SIPSimpleSettings()
        current_input_device = self.voice_audio_bridge.mixer.input_device
        current_output_device = self.voice_audio_bridge.mixer.output_device
        current_alert_device = self.alert_audio_bridge.mixer.output_device
        ec_tail_length = self.voice_audio_bridge.mixer.ec_tail_length
        if notification.data.changed_input and 'system_default' in (
                current_input_device, settings.audio.input_device):
            self.voice_audio_bridge.mixer.set_sound_devices(
                'system_default', current_output_device, ec_tail_length)
        if notification.data.changed_output and 'system_default' in (
                current_output_device, settings.audio.output_device):
            self.voice_audio_bridge.mixer.set_sound_devices(
                current_input_device, 'system_default', ec_tail_length)
        if notification.data.changed_output and 'system_default' in (
                current_alert_device, settings.audio.alert_device):
            self.alert_audio_bridge.mixer.set_sound_devices(
                None, 'system_default', 0)

    @run_in_thread('device-io')
    def _NH_AudioDevicesDidChange(self, notification):
        old_devices = set(notification.data.old_devices)
        new_devices = set(notification.data.new_devices)
        removed_devices = old_devices - new_devices

        if not removed_devices:
            return

        input_device = self.voice_audio_bridge.mixer.input_device
        output_device = self.voice_audio_bridge.mixer.output_device
        alert_device = self.alert_audio_bridge.mixer.output_device
        if self.voice_audio_bridge.mixer.real_input_device in removed_devices:
            input_device = 'system_default' if new_devices else None
        if self.voice_audio_bridge.mixer.real_output_device in removed_devices:
            output_device = 'system_default' if new_devices else None
        if self.alert_audio_bridge.mixer.real_output_device in removed_devices:
            alert_device = 'system_default' if new_devices else None

        self.voice_audio_bridge.mixer.set_sound_devices(
            input_device, output_device,
            self.voice_audio_bridge.mixer.ec_tail_length)
        self.alert_audio_bridge.mixer.set_sound_devices(None, alert_device, 0)

        settings = SIPSimpleSettings()
        settings.audio.input_device = self.voice_audio_bridge.mixer.input_device
        settings.audio.output_device = self.voice_audio_bridge.mixer.output_device
        settings.audio.alert_device = self.alert_audio_bridge.mixer.output_device
        settings.save()

    @run_in_thread('device-io')
    def _NH_VideoDevicesDidChange(self, notification):
        old_devices = set(notification.data.old_devices)
        new_devices = set(notification.data.new_devices)
        removed_devices = old_devices - new_devices

        if not removed_devices:
            return

        device = self.video_device.name
        if self.video_device.real_name in removed_devices:
            device = 'system_default' if new_devices else None

        settings = SIPSimpleSettings()
        self.video_device.set_camera(device, settings.video.resolution,
                                     settings.video.framerate)
        settings.video.device = self.video_device.name
        settings.save()

    def _NH_DNSNameserversDidChange(self, notification):
        if self.running:
            self.engine.set_nameservers(notification.data.nameservers)
            notification_center = NotificationCenter()
            notification_center.post_notification(
                'NetworkConditionsDidChange',
                sender=self,
                data=NotificationData(changed=['dns']))

    def _NH_SystemIPAddressDidChange(self, notification):
        self._network_conditions_changed()

    def _NH_SystemDidWakeUpFromSleep(self, notification):
        self._network_conditions_changed()
Example #3
0
    def _initialize_subsystems(self):
        notification_center = NotificationCenter()

        with self._lock:
            stop_pending = self._stop_pending
            if stop_pending:
                self.state = 'stopping'
        if stop_pending:
            notification_center.post_notification('SIPApplicationWillEnd', sender=self)
            reactor.stop()
            return

        account_manager = AccountManager()
        dns_manager = DNSManager()
        session_manager = SessionManager()
        settings = SIPSimpleSettings()

        # Initialize default account
        default_account = DefaultAccount()
        account_manager.default_account = default_account

        # initialize TLS
        self._initialize_tls()

        # initialize PJSIP internal resolver
        self.engine.set_nameservers(['8.8.8.8'])

        # initialize audio objects
        voice_mixer = AudioMixer(None, None, settings.audio.sample_rate, 0, 9999)
        self.voice_audio_device = AudioDevice(voice_mixer)
        self.voice_audio_bridge = RootAudioBridge(voice_mixer)
        self.voice_audio_bridge.add(self.voice_audio_device)

        # initialize video objects
        self.video_device = VideoDevice(u'Colorbar generator', settings.video.resolution, settings.video.framerate)

        # initialize instance id
        settings.instance_id = uuid4().urn
        settings.save()

        # initialize ZRTP cache
        makedirs(ServerConfig.spool_dir.normalized)
        self.engine.zrtp_cache = os.path.join(ServerConfig.spool_dir.normalized, 'zrtp.db')

        # initialize middleware components
        dns_manager.start()
        account_manager.start()
        session_manager.start()

        notification_center.add_observer(self, name='CFGSettingsObjectDidChange')

        self.state = 'started'
        notification_center.post_notification('SIPApplicationDidStart', sender=self)

        # start SylkServer components
        self.web_server = WebServer()
        self.web_server.start()
        self.request_handler = IncomingRequestHandler()
        self.request_handler.start()
        if ThorNodeConfig.enabled:
            from sylk.interfaces.sipthor import ConferenceNode
            self.thor_interface = ConferenceNode()
            thor_roles = []
            if 'conference' in self.request_handler.application_registry:
                thor_roles.append('conference_server')
            if 'xmppgateway' in self.request_handler.application_registry:
                thor_roles.append('xmpp_gateway')
            if 'webrtcgateway' in self.request_handler.application_registry:
                thor_roles.append('webrtc_gateway')
            self.thor_interface.start(thor_roles)