change yroom class attribute to instance attribute

Author: Jialin Zhang

pycrdt_websocket/yroom.py

@@ -30,19 +30,6 @@
 
 
 class YRoom:
-    clients: list
-    ydoc: Doc
-    ystore: BaseYStore | None
-    ready_event: Event
-    _on_message: Callable[[bytes], Awaitable[bool] | bool] | None
-    _update_send_stream: MemoryObjectSendStream
-    _update_receive_stream: MemoryObjectReceiveStream
-    _task_group: TaskGroup | None = None
-    _started: Event | None = None
-    _stopped: Event
-    __start_lock: Lock | None = None
-    _subscription: Subscription | None = None
-
     def __init__(
         self,
         ready: bool = True,
@@ -72,16 +59,23 @@ def __init__(
             returns True if the exception was handled.
             log: An optional logger.
         """
-        self.ydoc = Doc()
+        self.ydoc : Doc = Doc()
         self.awareness = Awareness(self.ydoc)
-        self.ready_event = Event()
+        self.ready_event : Event = Event()
         self.ready = ready
-        self.ystore = ystore
+        self.ystore : BaseYStore | None = ystore
         self.log = log or getLogger(__name__)
-        self.clients = []
-        self._on_message = None
+        self.clients : list = []
+        self._on_message : Callable[[bytes], Awaitable[bool] | bool] | None = None
         self.exception_handler = exception_handler
-        self._stopped = Event()
+        self._stopped : Event = Event()
+        self._update_send_stream, self._update_receive_stream = create_memory_object_stream(
+                max_buffer_size=0
+        )
+        self._task_group : TaskGroup | None = None
+        self._started: Event | None = None
+        self.__start_lock: Lock | None = None
+        self._subscription: Subscription | None = None
 
     @property
     def _start_lock(self) -> Lock: