init

backend/ws.py

@@ -0,0 +1,41 @@
+"""Live-Board-Hub: Statuswechsel aus der DB-Schicht → alle WebSocket-Clients.
+Kein Polling; das Frontend hält den Snapshot und wendet Deltas an."""
+
+import asyncio
+import json
+import logging
+
+log = logging.getLogger("creator2.ws")
+
+
+class Hub:
+    def __init__(self):
+        self._clients: set = set()
+        self._loop: asyncio.AbstractEventLoop | None = None
+
+    def bind_loop(self, loop: asyncio.AbstractEventLoop) -> None:
+        self._loop = loop
+
+    async def connect(self, websocket) -> None:
+        await websocket.accept()
+        self._clients.add(websocket)
+
+    def disconnect(self, websocket) -> None:
+        self._clients.discard(websocket)
+
+    def push(self, tabelle: str, row: dict) -> None:
+        """Thread-sicher (DB-Schicht ruft synchron): auf den Loop dispatchen."""
+        if not self._clients or self._loop is None:
+            return
+        msg = json.dumps({"tabelle": tabelle, "row": row}, ensure_ascii=False, default=str)
+        self._loop.call_soon_threadsafe(lambda: asyncio.ensure_future(self._send_all(msg)))
+
+    async def _send_all(self, msg: str) -> None:
+        for ws in list(self._clients):
+            try:
+                await ws.send_text(msg)
+            except Exception:
+                self._clients.discard(ws)
+
+
+hub = Hub()