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mod_pubsub: Explain caps_update usage in a comment

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The reason to use the caps_update hook for sending last items to remote
contacts is probably not obvious.
This commit is contained in:
Holger Weiss 2015-07-06 23:45:25 +02:00
parent 0770252e9b
commit edb18deb8f
1 changed files with 9 additions and 0 deletions
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9
src/mod_pubsub.erl
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@ -685,6 +685,15 @@ disco_items(Host, Node, From) ->
caps_update(#jid{luser = U, lserver = S, lresource = R}, #jid{lserver = Host} = JID, _Features)
when Host =/= S ->
%% When a remote contact goes online while the local user is offline, the
%% remote contact won't receive last items from the local user even if
%% ignore_pep_from_offline is set to false. To work around this issue a bit,
%% we'll also send the last items to remote contacts when the local user
%% connects. That's the reason to use the caps_update hook instead of the
%% presence_probe_hook for remote contacts: The latter is only called when a
%% contact becomes available; the former also is also executed when the
%% local user goes online (because that triggers the contact to send a
%% presence packet with CAPS).
presence(Host, {presence, U, S, [R], JID});
caps_update(_From, _To, _Feature) ->
ok.