Update Live-streaming code (auto-daily features)

app/admin_events.py

@@ -0,0 +1,43 @@
+from __future__ import annotations
+
+import asyncio
+import time
+
+
+class AdminEventBus:
+    def __init__(self):
+        self._subscribers: set[asyncio.Queue] = set()
+        self._counter = 0
+        self._lock = asyncio.Lock()
+
+    async def subscribe(self) -> asyncio.Queue:
+        queue: asyncio.Queue = asyncio.Queue(maxsize=64)
+        async with self._lock:
+            self._subscribers.add(queue)
+        return queue
+
+    async def unsubscribe(self, queue: asyncio.Queue) -> None:
+        async with self._lock:
+            self._subscribers.discard(queue)
+
+    def subscriber_count(self) -> int:
+        return len(self._subscribers)
+
+    async def publish(self, event_type: str, payload):
+        self._counter += 1
+        event = {
+            "id": self._counter,
+            "type": event_type,
+            "ts": time.time(),
+            "payload": payload,
+        }
+        for queue in list(self._subscribers):
+            if queue.full():
+                try:
+                    queue.get_nowait()
+                except asyncio.QueueEmpty:
+                    pass
+            try:
+                queue.put_nowait(event)
+            except asyncio.QueueFull:
+                pass