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"""Manage events from UniFi Network Controller."""
from __future__ import annotations
from collections.abc import Callable
import logging
from typing import TYPE_CHECKING
from ..models.event import Event, EventKey
from ..models.message import Message, MessageKey
if TYPE_CHECKING:
from ..controller import Controller
LOGGER = logging.getLogger(__name__)
SubscriptionCallback = Callable[[Event], None]
SubscriptionType = tuple[SubscriptionCallback, tuple[EventKey, ...] | None]
UnsubscribeType = Callable[[], None]
class EventHandler:
"""Event handler class."""
def __init__(self, controller: Controller) -> None:
"""Initialize API items."""
self.controller = controller
self._subscribers: list[SubscriptionType] = []
controller.messages.subscribe(self.handler, MessageKey.EVENT)
def subscribe(
self,
callback: SubscriptionCallback,
event_filter: tuple[EventKey, ...] | EventKey | None = None,
) -> UnsubscribeType:
"""Subscribe to events.
"callback" - callback function to call when on event.
Return function to unsubscribe.
"""
if isinstance(event_filter, EventKey):
event_filter = (event_filter,)
subscription = (callback, event_filter)
self._subscribers.append(subscription)
def unsubscribe() -> None:
self._subscribers.remove(subscription)
return unsubscribe
def handler(self, message: Message) -> None:
"""Receive event from message handler and identifies where the event belong."""
event = Event(message.data)
for callback, event_filter in self._subscribers:
if event_filter is not None and event.key not in event_filter:
continue
callback(event)
def __len__(self) -> int:
"""List number of event subscribers."""
return len(self._subscribers)
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