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"""Manages connection callbacks."""
from __future__ import annotations
import asyncio
from datetime import datetime
from xknx.core.connection_state import XknxConnectionState, XknxConnectionType
from xknx.typing import ConnectionChangeCallbackType
class ConnectionManager:
"""Manages connection state changes XKNX."""
def __init__(self) -> None:
"""Initialize ConnectionState class."""
self._main_loop: asyncio.AbstractEventLoop | None = None
self.connected = asyncio.Event()
self._state = XknxConnectionState.DISCONNECTED
self._connection_state_changed_cbs: list[ConnectionChangeCallbackType] = []
self.cemi_count_incoming: int = 0
self.cemi_count_incoming_error: int = 0
self.cemi_count_outgoing: int = 0
self.cemi_count_outgoing_error: int = 0
self.connected_since: datetime | None = None
self.connection_type: XknxConnectionType = XknxConnectionType.NOT_CONNECTED
async def register_loop(self) -> None:
"""Register main loop to enable thread-safe `connection_state_changed` calls."""
self._main_loop = asyncio.get_running_loop()
def register_connection_state_changed_cb(
self, connection_state_changed_cb: ConnectionChangeCallbackType
) -> None:
"""Register callback for connection state being updated."""
self._connection_state_changed_cbs.append(connection_state_changed_cb)
def unregister_connection_state_changed_cb(
self, connection_state_changed_cb: ConnectionChangeCallbackType
) -> None:
"""Unregister callback for connection state being updated."""
if connection_state_changed_cb in self._connection_state_changed_cbs:
self._connection_state_changed_cbs.remove(connection_state_changed_cb)
def connection_state_changed(
self,
state: XknxConnectionState,
connection_type: XknxConnectionType = XknxConnectionType.NOT_CONNECTED,
) -> None:
"""Run registered callbacks in main loop. Set internal state flag."""
if self._main_loop:
self._main_loop.call_soon_threadsafe(
self._connection_state_changed, state, connection_type
)
else:
self._connection_state_changed(state, connection_type)
def _connection_state_changed(
self, state: XknxConnectionState, connection_type: XknxConnectionType
) -> None:
"""Run registered callbacks. Set internal state flag."""
if self._state == state:
return
self._state = state
self.connection_type = connection_type
if state == XknxConnectionState.CONNECTED:
self.connected.set()
self._reset_counters()
else:
self.connected.clear()
self.connected_since = None
for connection_state_change_cb in self._connection_state_changed_cbs:
connection_state_change_cb(state)
@property
def state(self) -> XknxConnectionState:
"""Get current state."""
return self._state
def _reset_counters(self) -> None:
"""Reset counters."""
self.cemi_count_incoming = 0
self.cemi_count_incoming_error = 0
self.cemi_count_outgoing = 0
self.cemi_count_outgoing_error = 0
self.connected_since = datetime.now().astimezone()
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