Beispiel #1
0
    def __init__(self):
        """Whole project is run from this constructor
        """

        # +++++++++++++++ Init +++++++++++++++ #

        self.keep_run = 0  # used in run for daemon loop, reset by SIGTERM

        self.log = Log(self)
        self.settings = Settings(self)
        self.led = LED(self)
        self.dbhandle = DBHandle(self)
        self.mixer = AlsaMixer(self)
        self.usb = UsbManager(self)
        self.rfcomm = RFCommServer(self)
        self.cmd = EvalCmd(self)
        self.listmngr = PlayListManager(self)
        self.play = Play(self)
        self.lirc = LircThread(self)
        self.buttons = Buttons(self)
        self.keep_run = 1
        self.ret_code = 0  # return code to command line (10 = shutdown)

        self.led.reset_leds()

        # invoke arg parser and parse config or create new config if not found
        self.settings.parse()

        # check if we can load database, create otherwise
        self.dbhandle.dbconnect()

        # restore alsa mixer settings
        self.mixer.restore_mixer()

        # load connected usb before bluetooth
        self.usb.check_new_usb()

        # initialize sound mixer
        self.play.init_mixer()

        # load latest playlist from database
        self.listmngr.load_active_playlist()

        # open cmd fifo to read commands
        self.cmd.open_fifo()

        # fire up bluetooth service
        self.rfcomm.start_server_thread()

        # start lirc thread
        self.lirc.start()

        # fire up one thread per each button
        self.buttons.start()

        # +++++++++++++++ Daemoninze +++++++++++++++ #

        self.check_pidfile()
        self.daemonize()
        self.create_pidfile()

        self.led.show_init_done()

        # +++++++++++++++ Daemon loop +++++++++++++++ #

        self.run()

        # +++++++++++++++ Finalize +++++++++++++++ #

        self.listmngr.save_active()
        self.led.cleanup()
        self.delete_pidfile()
Beispiel #2
0
class PyBlaster:
    """Daemon for PiBlaster project"""

    def __init__(self):
        """Whole project is run from this constructor
        """

        # +++++++++++++++ Init +++++++++++++++ #

        self.keep_run = 0  # used in run for daemon loop, reset by SIGTERM

        self.log = Log(self)
        self.settings = Settings(self)
        self.led = LED(self)
        self.dbhandle = DBHandle(self)
        self.mixer = AlsaMixer(self)
        self.usb = UsbManager(self)
        self.rfcomm = RFCommServer(self)
        self.cmd = EvalCmd(self)
        self.listmngr = PlayListManager(self)
        self.play = Play(self)
        self.lirc = LircThread(self)
        self.buttons = Buttons(self)
        self.keep_run = 1
        self.ret_code = 0  # return code to command line (10 = shutdown)

        self.led.reset_leds()

        # invoke arg parser and parse config or create new config if not found
        self.settings.parse()

        # check if we can load database, create otherwise
        self.dbhandle.dbconnect()

        # restore alsa mixer settings
        self.mixer.restore_mixer()

        # load connected usb before bluetooth
        self.usb.check_new_usb()

        # initialize sound mixer
        self.play.init_mixer()

        # load latest playlist from database
        self.listmngr.load_active_playlist()

        # open cmd fifo to read commands
        self.cmd.open_fifo()

        # fire up bluetooth service
        self.rfcomm.start_server_thread()

        # start lirc thread
        self.lirc.start()

        # fire up one thread per each button
        self.buttons.start()

        # +++++++++++++++ Daemoninze +++++++++++++++ #

        self.check_pidfile()
        self.daemonize()
        self.create_pidfile()

        self.led.show_init_done()

        # +++++++++++++++ Daemon loop +++++++++++++++ #

        self.run()

        # +++++++++++++++ Finalize +++++++++++++++ #

        self.listmngr.save_active()
        self.led.cleanup()
        self.delete_pidfile()

    def run(self):
        """Daemon loop"""

        # Expensive operations like new usb drive check
        # should not be run every loop run.
        poll_count = 0

        # -e flag is set, run only init and exit directly.
        self.keep_run = 0 if self.settings.exitafterinit else 1

        reset_poll_count = self.settings.keep_alive_count * 30 * 4

        # # # # # # DAEMON LOOP ENTRY # # # # # #

        while self.keep_run:

            poll_count += 1

            # Check cmd fifo for new commands.
            if poll_count % 10 == 0:
                # each 300 ms is enough
                self.cmd.read_fifo()

            # Check button events
            if self.buttons.has_button_events():
                self.buttons.read_buttons()

            # Check bluetooth channel for new messages/connections.
            self.rfcomm.check_incomming_commands()

            # Check if lirc thread has command in queue
            if self.lirc.queue_not_empty():
                ircmd = self.lirc.read_command()
                if ircmd is not None:
                    self.cmd.evalcmd(ircmd, "lirc")

            # Check if song has ended
            if poll_count % 4 == 0:
                # every 120 ms
                self.play.check_pygame_events()

            time.sleep(self.settings.polltime / 1000.)  # 30ms default in
                                                        # config

            if poll_count % self.settings.keep_alive_count == 0:
                self.led.set_led_green(1)

            if (poll_count - self.settings.flash_count) % \
                    self.settings.keep_alive_count == 0:
                self.led.set_led_green(0)

            # Check for new USB drives.
            if poll_count % 30 == 0:
                # If new usb device found, new usbdev instance will be created,
                # including dir and mp3 entries.
                # If usb device got lost, all its entries will be removed.
                # To check every ~900ms is enough
                self.usb.check_new_usb()

            # Multiple of all poll counts reached:
            # may reset poll count at reset_poll_count.
            if poll_count >= reset_poll_count:
                poll_count = 0

            # end daemon loop #

        # # # # # # DAEMON LOOP EXIT # # # # # #

        # join remaining threads
        self.mixer.save_mixer()
        self.lirc.join()
        self.buttons.join()
        self.rfcomm.join()

        self.log.write(log.MESSAGE, "---- closed regularly ----")

    # end run() #

    def daemonize(self):
        """Fork process and disable print in log object"""

        signal.signal(signal.SIGTERM, self.term_handler)
        signal.signal(signal.SIGINT, self.term_handler)

        if not self.settings.daemonize:
            self.log.init_log()
            return

        self.log.write(log.DEBUG1, "daemonizing")

        try:
            pid = os.fork()
        except OSError:
            self.log.write(log.EMERGENCY, "Failed to fork daemon")
            raise

        if pid == 0:
            os.setsid()
            try:
                pid = os.fork()
            except OSError:
                self.log.write(log.EMERGENCY, "Failed to fork daemon")
                raise

            if pid == 0:
                os.chdir("/tmp")
                os.umask(0)
            else:
                os._exit(0)
        else:
            os._exit(0)

        self.settings.is_daemonized = True
        self.log.init_log()
        self.log.write(log.MESSAGE, "daemonized.")

    # end daemonize() #

    def term_handler(self, *args):
        """ Signal handler to stop daemon loop"""
        self.keep_run = 0

    def check_pidfile(self):
        """Check if daemon already running, throw if pid file found"""

        if os.path.exists(self.settings.pidfile):
            self.log.write(log.EMERGENCY, "Found pid file for pyblaster, "
                           "another process running?")
            raise Exception("pid file found")

    def create_pidfile(self):
        """Write getpid() to file after daemonize()"""

        try:
            fpid = open(self.settings.pidfile, "w")
        except IOError:
            self.log.write(log.EMERGENCY, "failed to create pidfile %s" %
                           self.settings.pidfile)
            raise

        fpid.write("%s\n" % os.getpid())

    def delete_pidfile(self):
        """Try to remove pid file after daemon should exit"""

        if os.path.exists(self.settings.pidfile):
            try:
                os.remove(self.settings.pidfile)
            except OSError:
                self.log.write(log.EMERGENCY, "failed to remove pidfile %s" %
                               self.settings.pidfile)
                raise

    def kill_other_pyblaster(self):
        """Check if pid found in pid file and try to kill this (old) process"""

        if not os.path.exists(self.settings.pidfile):
            return

        try:
            f = open(self.settings.pidfile, "r")
        except IOError:
            self.log.write(log.EMERGENCY, "failed to read pidfile %s" %
                           self.settings.pidfile)
            raise

        pid = int(f.readline().strip())

        print("Trying to kill old process with pid %s..." % pid)

        try:
            os.kill(pid, signal.SIGTERM)
        except OSError:
            self.log.write(log.EMERGENCY,
                           "failed to kill process with pid %s" % pid)
            raise

        exit(0)