kumomta

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Wez Furlong e0326e4c39 queue: make bounce_all do spool removal async

I think we've gone back and forth on this a couple of times.
The motivation for this commit is that we've been troubleshooting
an issue that seems to be triggered by bouncing all the mail.
The symptom is that the system becomes unresponsive after
triggering the bounce.

Here in the context of `bounce_all`, the queue lock is held
so that we can capture the messages, but then we serially
remove them from the spool, so that we can report the total
number back to the originating HTTP request.

For a large queue size that presents a big point of contention
for other tasks or requests that may need to operate on the
queue.

This commit moves that spool removal into another task so that
that task can run asynchronously and independently from the
bounce HTTP request.

The consequence of this is that the numbers reported by the
bounce request will likely be lower than the final count.
The `bounce-list` kcli command can be used to check up on
those numbers.

2024-04-10 08:10:03 -07:00