mirror of
https://github.com/nesquena/hermes-webui.git
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dobby-d-elf
46 lines
1.3 KiB
Python
46 lines
1.3 KiB
Python
"""Lightweight in-process invalidation events for session sidebar state."""
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import queue
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import threading
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_SESSION_EVENTS_LOCK = threading.Lock()
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_SESSION_EVENTS_SUBSCRIBERS: set[queue.Queue] = set()
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_SESSION_EVENTS_VERSION = 0
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def publish_session_list_changed(reason: str = "session_changed") -> None:
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"""Notify connected browsers that the session sidebar may be stale."""
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global _SESSION_EVENTS_VERSION
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with _SESSION_EVENTS_LOCK:
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_SESSION_EVENTS_VERSION += 1
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payload = {
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"type": "sessions_changed",
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"version": _SESSION_EVENTS_VERSION,
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"reason": reason,
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}
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subscribers = list(_SESSION_EVENTS_SUBSCRIBERS)
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for q in subscribers:
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try:
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q.put_nowait(payload)
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except queue.Full:
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try:
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q.get_nowait()
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except queue.Empty:
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pass
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try:
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q.put_nowait(payload)
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except queue.Full:
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pass
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def subscribe_session_events() -> queue.Queue:
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q: queue.Queue = queue.Queue(maxsize=1)
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with _SESSION_EVENTS_LOCK:
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_SESSION_EVENTS_SUBSCRIBERS.add(q)
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return q
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def unsubscribe_session_events(q: queue.Queue) -> None:
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with _SESSION_EVENTS_LOCK:
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_SESSION_EVENTS_SUBSCRIBERS.discard(q)
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