platypush/platypush/backend/pushbullet/listener.py

import logging
import time
from typing import Callable, Optional

from pushbullet import Listener as _Listener


class Listener(_Listener):
    """
    Extends the Pushbullet Listener object by adding ``on_open`` and ``on_close`` handlers.
    """
    def __init__(self,
                 *args,
                 on_open: Optional[Callable[[], None]] = None,
                 on_close: Optional[Callable[[], None]] = None,
                 **kwargs):
        super().__init__(*args, **kwargs)
        self._on_open_hndl = on_open
        self._on_close_hndl = on_close
        self.logger = logging.getLogger(__name__)

    def _on_open(self):
        def callback(*_):
            self.connected = True
            self.last_update = time.time()
            if self._on_open_hndl:
                self._on_open_hndl()

        return callback

    def _on_close(self):
        def callback(*_):
            self.connected = False
            if self._on_close_hndl:
                try:
                    self._on_close_hndl()
                except Exception as e:
                    self.logger.warning(f'Pushbullet listener close error: {e}')

        return callback


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