prototype

wisper.py

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+import asyncio
+from dataclasses import dataclass, field
+from datetime import datetime, timezone
+
+
+@dataclass(slots=True)
+class WisperEvent:
+    role: str
+    text: str
+    timestamp: str = field(
+        default_factory=lambda: datetime.now(timezone.utc).isoformat(timespec="seconds")
+    )
+
+    def to_dict(self) -> dict[str, str]:
+        return {"role": self.role, "text": self.text, "timestamp": self.timestamp}
+
+
+class WisperBus:
+    def __init__(self) -> None:
+        self._subscribers: set[asyncio.Queue[WisperEvent]] = set()
+        self._lock = asyncio.Lock()
+
+    async def subscribe(self) -> asyncio.Queue[WisperEvent]:
+        queue: asyncio.Queue[WisperEvent] = asyncio.Queue()
+        async with self._lock:
+            self._subscribers.add(queue)
+        return queue
+
+    async def unsubscribe(self, queue: asyncio.Queue[WisperEvent]) -> None:
+        async with self._lock:
+            self._subscribers.discard(queue)
+
+    async def publish(self, event: WisperEvent) -> None:
+        async with self._lock:
+            subscribers = list(self._subscribers)
+        for queue in subscribers:
+            queue.put_nowait(event)