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python/aqmp: Return cleared events from EventListener.clear()
This serves two purposes: (1) It is now possible to discern whether or not clear() removed any event(s) from the queue with absolute certainty, and (2) It is now very easy to get a List of all pending events in one chunk, which is useful for the sync bridge. Signed-off-by: John Snow <jsnow@redhat.com> Reviewed-by: Hanna Reitz <hreitz@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Message-id: 20210923004938.3999963-4-jsnow@redhat.com Signed-off-by: John Snow <jsnow@redhat.com>
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@ -562,7 +562,7 @@ def empty(self) -> bool:
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"""
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return self._queue.empty()
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def clear(self) -> None:
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def clear(self) -> List[Message]:
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"""
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Clear this listener of all pending events.
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@ -570,17 +570,22 @@ def clear(self) -> None:
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pending FIFO queue synchronously. It can be also be used to
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manually clear any pending events, if desired.
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:return: The cleared events, if any.
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.. warning::
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Take care when discarding events. Cleared events will be
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silently tossed on the floor. All events that were ever
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accepted by this listener are visible in `history()`.
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"""
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events = []
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while True:
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try:
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self._queue.get_nowait()
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events.append(self._queue.get_nowait())
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except asyncio.QueueEmpty:
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break
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return events
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def __aiter__(self) -> AsyncIterator[Message]:
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return self
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