Dominic Gundel
8e88efc094
Migrationen 003–009, Kundaufträge mit Lieferschein, Abräumen mit Urteil, ntfy/Backup/Zeitfenster, Live-Stream und Mobile-Mehr-Menü.
43 lines
935 B
Python
43 lines
935 B
Python
"""Thread-sicherer Pub/Sub für Server-Sent Events (Live-UI)."""
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from __future__ import annotations
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import threading
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from queue import Empty, Queue
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_lock = threading.Lock()
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_subscribers: list[Queue] = []
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def subscribe() -> Queue:
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q: Queue = Queue(maxsize=256)
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with _lock:
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_subscribers.append(q)
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return q
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def unsubscribe(q: Queue) -> None:
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with _lock:
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try:
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_subscribers.remove(q)
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except ValueError:
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pass
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def publish(kind: str, payload: dict | None = None) -> None:
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msg = {"kind": kind or "message", "payload": payload if payload is not None else {}}
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with _lock:
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targets = list(_subscribers)
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for q in targets:
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try:
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q.put_nowait(msg)
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except Exception:
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pass
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def wait_event(q: Queue, timeout_s: float) -> dict | None:
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try:
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return q.get(timeout=timeout_s)
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except Empty:
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return None
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