Module pyControl4.websocket
Handles Websocket connections to a Control4 Director, allowing for real-time updates using callbacks.
Expand source code
"""Handles Websocket connections to a Control4 Director, allowing for real-time updates using callbacks."""
import aiohttp
import async_timeout
import socketio
import logging
from .error_handling import checkResponseForError
_LOGGER = logging.getLogger(__name__)
class _C4DirectorNamespace(socketio.AsyncClientNamespace):
def __init__(self, *args, **kwargs):
self.url = kwargs.pop("url")
self.token = kwargs.pop("token")
self.callback = kwargs.pop("callback")
self.session = kwargs.pop("session")
self.connect_callback = kwargs.pop("connect_callback")
self.disconnect_callback = kwargs.pop("disconnect_callback")
super().__init__(*args, **kwargs)
self.uri = "/api/v1/items/datatoui"
self.subscriptionId = None
self.connected = False
async def on_connect(self):
_LOGGER.debug("Control4 Director socket.io connection established!")
if self.connect_callback is not None:
await self.connect_callback()
async def on_disconnect(self):
self.connected = False
self.subscriptionId = None
_LOGGER.debug("Control4 Director socket.io disconnected.")
if self.disconnect_callback is not None:
await self.disconnect_callback()
async def trigger_event(self, event, *args):
if event == "subscribe":
await self.on_subscribe(*args)
elif event == "connect":
await self.on_connect()
elif event == "disconnect":
await self.on_disconnect()
elif event == "clientId":
await self.on_clientId(*args)
elif event == self.subscriptionId:
msg = args[0]
if "status" in msg:
_LOGGER.debug(f'Status message received from Director: {msg["status"]}')
await self.emit("2")
else:
await self.callback(args[0])
async def on_clientId(self, clientId):
await self.emit("2probe")
if not self.connected and not self.subscriptionId:
_LOGGER.debug("Fetching subscriptionID from Control4")
if self.session is None:
async with aiohttp.ClientSession(
connector=aiohttp.TCPConnector(verify_ssl=False)
) as session:
with async_timeout.timeout(10):
async with session.get(
self.url + self.uri,
params={"JWT": self.token, "SubscriptionClient": clientId},
) as resp:
await checkResponseForError(await resp.text())
data = await resp.json()
self.connected = True
self.subscriptionId = data["subscriptionId"]
await self.emit("startSubscription", self.subscriptionId)
else:
with async_timeout.timeout(10):
async with self.session.get(
self.url + self.uri,
params={"JWT": self.token, "SubscriptionClient": clientId},
) as resp:
await checkResponseForError(await resp.text())
data = await resp.json()
self.connected = True
self.subscriptionId = data["subscriptionId"]
await self.emit("startSubscription", self.subscriptionId)
async def on_subscribe(self, message):
await self.message(message)
class C4Websocket:
def __init__(
self,
ip,
session_no_verify_ssl: aiohttp.ClientSession = None,
connect_callback=None,
disconnect_callback=None,
):
"""Creates a Control4 Websocket object.
Parameters:
`ip` - The IP address of the Control4 Director/Controller.
`session` - (Optional) Allows the use of an
`aiohttp.ClientSession` object
for all network requests. This
session will not be closed by the library.
If not provided, the library will open and
close its own `ClientSession`s as needed.
`connect_callback` - (Optional) A callback to be called when the Websocket connection is opened or reconnected after a network error.
`disconnect_callback` - (Optional) A callback to be called when the Websocket connection is lost due to a network error.
"""
self.base_url = "https://{}".format(ip)
self.wss_url = "wss://{}".format(ip)
self.session = session_no_verify_ssl
self.connect_callback = connect_callback
self.disconnect_callback = disconnect_callback
# Keep track of the callbacks registered for each item id
self._item_callbacks = dict()
# Initialize self._sio to None
self._sio = None
@property
def item_callbacks(self):
"""Returns a dictionary of registered item ids (key) and their callbacks (value).
item_callbacks cannot be modified directly. Use add_item_callback() and remove_item_callback() instead.
"""
return self._item_callbacks
def add_item_callback(self, item_id, callback):
"""Register a callback to receive updates about an item.
If a callback is already registered for the item, it will be overwritten with the provided callback.
Parameters:
`item_id` - The Control4 item ID.
`callback` - The callback to be called when an update is received for the provided item id.
"""
_LOGGER.debug("Subscribing to updates for item id: %s", item_id)
self._item_callbacks[item_id] = callback
def remove_item_callback(self, item_id):
"""Unregister callback for an item.
Parameters:
`item_id` - The Control4 item ID.
"""
self._item_callbacks.pop(item_id)
async def sio_connect(self, director_bearer_token):
"""Start WebSockets connection and listen, using the provided director_bearer_token to authenticate with the Control4 Director.
If a connection already exists, it will be disconnected and a new connection will be created.
This function should be called using a new token every 86400 seconds (the expiry time of the director tokens), otherwise the Control4 Director will stop sending WebSocket messages.
Parameters:
`director_bearer_token` - The bearer token used to authenticate with the Director. See `pyControl4.account.C4Account.getDirectorBearerToken` for how to get this.
"""
# Disconnect previous sio object
await self.sio_disconnect()
self._sio = socketio.AsyncClient(ssl_verify=False)
self._sio.register_namespace(
_C4DirectorNamespace(
token=director_bearer_token,
url=self.base_url,
callback=self._callback,
session=self.session,
connect_callback=self.connect_callback,
disconnect_callback=self.disconnect_callback,
)
)
await self._sio.connect(
self.wss_url,
transports=["websocket"],
headers={"JWT": director_bearer_token},
)
async def sio_disconnect(self):
"""Disconnects the WebSockets connection, if it has been created."""
if isinstance(self._sio, socketio.AsyncClient):
await self._sio.disconnect()
async def _callback(self, message):
if "status" in message:
_LOGGER.debug(f'Subscription {message["status"]}')
return True
if isinstance(message, list):
for m in message:
await self._process_message(m)
else:
await self._process_message(message)
async def _process_message(self, message):
"""Process an incoming event message."""
_LOGGER.debug(message)
try:
c = self._item_callbacks[message["iddevice"]]
except KeyError:
_LOGGER.debug("No Callback for device id {}".format(message["iddevice"]))
return True
if isinstance(message, list):
for m in message:
await c(message["iddevice"], m)
else:
await c(message["iddevice"], message)
async def _execute_callback(self, callback, *args, **kwargs):
"""Callback with some data capturing any excpetions."""
try:
self.sio.emit("ping")
await callback(*args, **kwargs)
except Exception as exc:
_LOGGER.warning("Captured exception during callback: {}".format(str(exc)))
Classes
class C4Websocket (ip, session_no_verify_ssl: aiohttp.client.ClientSession = None, connect_callback=None, disconnect_callback=None)-
Creates a Control4 Websocket object.
Parameters
ip- The IP address of the Control4 Director/Controller.session- (Optional) Allows the use of anaiohttp.ClientSessionobject for all network requests. This session will not be closed by the library. If not provided, the library will open and close its ownClientSessions as needed.connect_callback- (Optional) A callback to be called when the Websocket connection is opened or reconnected after a network error.disconnect_callback- (Optional) A callback to be called when the Websocket connection is lost due to a network error.Expand source code
class C4Websocket: def __init__( self, ip, session_no_verify_ssl: aiohttp.ClientSession = None, connect_callback=None, disconnect_callback=None, ): """Creates a Control4 Websocket object. Parameters: `ip` - The IP address of the Control4 Director/Controller. `session` - (Optional) Allows the use of an `aiohttp.ClientSession` object for all network requests. This session will not be closed by the library. If not provided, the library will open and close its own `ClientSession`s as needed. `connect_callback` - (Optional) A callback to be called when the Websocket connection is opened or reconnected after a network error. `disconnect_callback` - (Optional) A callback to be called when the Websocket connection is lost due to a network error. """ self.base_url = "https://{}".format(ip) self.wss_url = "wss://{}".format(ip) self.session = session_no_verify_ssl self.connect_callback = connect_callback self.disconnect_callback = disconnect_callback # Keep track of the callbacks registered for each item id self._item_callbacks = dict() # Initialize self._sio to None self._sio = None @property def item_callbacks(self): """Returns a dictionary of registered item ids (key) and their callbacks (value). item_callbacks cannot be modified directly. Use add_item_callback() and remove_item_callback() instead. """ return self._item_callbacks def add_item_callback(self, item_id, callback): """Register a callback to receive updates about an item. If a callback is already registered for the item, it will be overwritten with the provided callback. Parameters: `item_id` - The Control4 item ID. `callback` - The callback to be called when an update is received for the provided item id. """ _LOGGER.debug("Subscribing to updates for item id: %s", item_id) self._item_callbacks[item_id] = callback def remove_item_callback(self, item_id): """Unregister callback for an item. Parameters: `item_id` - The Control4 item ID. """ self._item_callbacks.pop(item_id) async def sio_connect(self, director_bearer_token): """Start WebSockets connection and listen, using the provided director_bearer_token to authenticate with the Control4 Director. If a connection already exists, it will be disconnected and a new connection will be created. This function should be called using a new token every 86400 seconds (the expiry time of the director tokens), otherwise the Control4 Director will stop sending WebSocket messages. Parameters: `director_bearer_token` - The bearer token used to authenticate with the Director. See `pyControl4.account.C4Account.getDirectorBearerToken` for how to get this. """ # Disconnect previous sio object await self.sio_disconnect() self._sio = socketio.AsyncClient(ssl_verify=False) self._sio.register_namespace( _C4DirectorNamespace( token=director_bearer_token, url=self.base_url, callback=self._callback, session=self.session, connect_callback=self.connect_callback, disconnect_callback=self.disconnect_callback, ) ) await self._sio.connect( self.wss_url, transports=["websocket"], headers={"JWT": director_bearer_token}, ) async def sio_disconnect(self): """Disconnects the WebSockets connection, if it has been created.""" if isinstance(self._sio, socketio.AsyncClient): await self._sio.disconnect() async def _callback(self, message): if "status" in message: _LOGGER.debug(f'Subscription {message["status"]}') return True if isinstance(message, list): for m in message: await self._process_message(m) else: await self._process_message(message) async def _process_message(self, message): """Process an incoming event message.""" _LOGGER.debug(message) try: c = self._item_callbacks[message["iddevice"]] except KeyError: _LOGGER.debug("No Callback for device id {}".format(message["iddevice"])) return True if isinstance(message, list): for m in message: await c(message["iddevice"], m) else: await c(message["iddevice"], message) async def _execute_callback(self, callback, *args, **kwargs): """Callback with some data capturing any excpetions.""" try: self.sio.emit("ping") await callback(*args, **kwargs) except Exception as exc: _LOGGER.warning("Captured exception during callback: {}".format(str(exc)))Instance variables
var item_callbacks-
Returns a dictionary of registered item ids (key) and their callbacks (value).
item_callbacks cannot be modified directly. Use add_item_callback() and remove_item_callback() instead.
Expand source code
@property def item_callbacks(self): """Returns a dictionary of registered item ids (key) and their callbacks (value). item_callbacks cannot be modified directly. Use add_item_callback() and remove_item_callback() instead. """ return self._item_callbacks
Methods
def add_item_callback(self, item_id, callback)-
Register a callback to receive updates about an item. If a callback is already registered for the item, it will be overwritten with the provided callback.
Parameters
item_id- The Control4 item ID.callback- The callback to be called when an update is received for the provided item id.Expand source code
def add_item_callback(self, item_id, callback): """Register a callback to receive updates about an item. If a callback is already registered for the item, it will be overwritten with the provided callback. Parameters: `item_id` - The Control4 item ID. `callback` - The callback to be called when an update is received for the provided item id. """ _LOGGER.debug("Subscribing to updates for item id: %s", item_id) self._item_callbacks[item_id] = callback def remove_item_callback(self, item_id)-
Unregister callback for an item.
Parameters
item_id- The Control4 item ID.Expand source code
def remove_item_callback(self, item_id): """Unregister callback for an item. Parameters: `item_id` - The Control4 item ID. """ self._item_callbacks.pop(item_id) async def sio_connect(self, director_bearer_token)-
Start WebSockets connection and listen, using the provided director_bearer_token to authenticate with the Control4 Director. If a connection already exists, it will be disconnected and a new connection will be created.
This function should be called using a new token every 86400 seconds (the expiry time of the director tokens), otherwise the Control4 Director will stop sending WebSocket messages.
Parameters
director_bearer_token- The bearer token used to authenticate with the Director. SeeC4Account.getDirectorBearerToken()for how to get this.Expand source code
async def sio_connect(self, director_bearer_token): """Start WebSockets connection and listen, using the provided director_bearer_token to authenticate with the Control4 Director. If a connection already exists, it will be disconnected and a new connection will be created. This function should be called using a new token every 86400 seconds (the expiry time of the director tokens), otherwise the Control4 Director will stop sending WebSocket messages. Parameters: `director_bearer_token` - The bearer token used to authenticate with the Director. See `pyControl4.account.C4Account.getDirectorBearerToken` for how to get this. """ # Disconnect previous sio object await self.sio_disconnect() self._sio = socketio.AsyncClient(ssl_verify=False) self._sio.register_namespace( _C4DirectorNamespace( token=director_bearer_token, url=self.base_url, callback=self._callback, session=self.session, connect_callback=self.connect_callback, disconnect_callback=self.disconnect_callback, ) ) await self._sio.connect( self.wss_url, transports=["websocket"], headers={"JWT": director_bearer_token}, ) async def sio_disconnect(self)-
Disconnects the WebSockets connection, if it has been created.
Expand source code
async def sio_disconnect(self): """Disconnects the WebSockets connection, if it has been created.""" if isinstance(self._sio, socketio.AsyncClient): await self._sio.disconnect()