Support document fork

Author: davidbrochart

pycrdt_websocket/yroom.py

@@ -33,6 +33,7 @@
 
 class YRoom:
     clients: set[Websocket]
+    fork_ydocs: set[Doc]
     ydoc: Doc
     ystore: BaseYStore | None
     ready_event: Event
@@ -83,6 +84,7 @@ def __init__(
         self.ystore = ystore
         self.log = log or getLogger(__name__)
         self.clients = set()
+        self.fork_ydocs = set()
         self._on_message = None
         self.exception_handler = exception_handler
         self._stopped = Event()
@@ -149,12 +151,15 @@ async def _broadcast_updates(self):
                     return
                 # broadcast internal ydoc's update to all clients, that includes changes from the
                 # clients and changes from the backend (out-of-band changes)
+                for ydoc in self.fork_ydocs:
+                    ydoc.apply_update(update)
+
                 if self.clients:
                     message = create_update_message(update)
                     for client in self.clients:
                         try:
                             self.log.debug(
-                                "Sending Y update to client with endpoint: %s", client.path
+                                "Sending Y update to remote client with endpoint: %s", client.path
                             )
                             self._task_group.start_soon(client.send, message)
                         except Exception as exception: