prosody
affaf6d08d26
spec/scansion/tombstones.scs

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spec/scansion/tombstones.scs @ 13186:affaf6d08d26

util.datamanager: Pad list writes to avoid crossing block boundaries By padding items so that they do not cross block boundaries, it becomes eaiser to delete whole blocks with fallocate() without cutting items in half, improving efficiency of such operations. Since list stores are used for message archives, where the most common deletion operation would be of the oldest entires, at the top of the file. With this, all blocks that contain items to be removed could be deleted without needing to read, delete and write out the whole file.
author Kim Alvefur <zash@zash.se>
date Wed, 07 Jun 2023 00:39:30 +0200
parent 12116:efcf25ad5406
line wrap: on
line source

# Tombstones

[Client] Romeo
	jid: romeo@localhost
	password: password

[Client] Juliet
	jid: juliet-tombstones@localhost
	password: password

---------

Romeo connects

Juliet connects

Juliet sends:
	<iq type="set" id="bye">
		<query xmlns="jabber:iq:register">
			<remove/>
		</query>
	</iq>

# Scansion gets disconnected right after this with a stream error makes
# scansion itself abort, so we preemptively disconnect to avoid that
# Juliet receives:
#	<iq type="result" id="bye"/>

Juliet disconnects

Romeo sends:
	<presence type="probe" to="${Juliet's JID}"/>

Romeo receives:
	<presence type="error" from="${Juliet's JID}"/>

Romeo receives:
	<presence type="unsubscribed" from="${Juliet's JID}"/>