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annotate mod_ping_muc/mod_ping_muc.lua @ 4942:e7b9bc629ecc

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mod_rest: Add special handling to catch MAM results from remote hosts Makes MAM queries to remote hosts works. As the comment says, MAM results from users' local archives or local MUCs are returned via origin.send() which is provided in the event and thus already worked. Results from remote hosts go via normal stanza routing and events, which need this extra handling to catch. This pattern of iq-set, message+, iq-result is generally limited to MAM. Closest similar thing might be MUC join, but to really handle that you would need the webhook callback mechanism.
author Kim Alvefur <zash@zash.se>
date Mon, 16 May 2022 19:47:09 +0200
parents 806f7c8d830b
children 0772facc786f
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a7c0c70e64b6 mod_ping_muc: Yet another attempt to improve MUC reliability
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1 local id = require "util.id";
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2 local jid = require "util.jid";
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3 local set = require "util.set";
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4 local st = require "util.stanza";
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5
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6 module:depends "track_muc_joins";
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7 module:add_feature("https://modules.prosody.im/mod_" .. module.name);
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8
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9 local local_sessions = prosody.hosts[module.host].sessions;
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10
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11 module:hook_global("s2s-destroyed", function(event)
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12 local s2s_session = event.session;
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13 if s2s_session.direction == "outgoing" and s2s_session.from_host ~= module.host then
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14 return
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15 elseif s2s_session.direction == "incoming" and s2s_session.to_host ~= module.host then
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16 return
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17 end
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18
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19 local related_hosts = set.new({ s2s_session.direction == "outgoing" and s2s_session.to_host or s2s_session.from_host });
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20
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21 if s2s_session.hosts then
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22 -- While rarely used, multiplexing is still supported
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23 for host, state in pairs(s2s_session.hosts) do if state.authed then related_hosts:add(host); end end
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24 end
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25
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26 for _, user_session in pairs(local_sessions) do
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27 for _, session in pairs(user_session.sessions) do
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28 if session.rooms_joined then
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29 for room, info in pairs(session.rooms_joined) do
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30 local nick = info.nick or info;
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31 local room_nick = room .. "/" .. nick;
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32 if related_hosts:contains(jid.host(room)) then
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33 -- User is in a MUC room for which the s2s connection was lost. Now what?
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34
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35 -- Self-ping
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36 -- =========
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37 --
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38 -- Response of <iq type=result> means the user is still in the room
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39 -- (and self-ping is supported), so we do nothing.
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40 --
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41 -- An error reply either means the user has fallen out of the room,
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42 -- or that self-ping is unsupported. In the later case, whether the
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43 -- user is still joined is indeterminate and we might as well
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44 -- pretend they fell out.
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45 module:send_iq(st.iq({ type = "get"; id = id.medium(); from = session.full_jid; to = room_nick })
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46 :tag("ping", { xmlns = "urn:xmpp:ping"; }))
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47 :catch(function(err)
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48 module:send(
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49 st.presence({ type = "unavailable"; id = id.medium(); to = session.full_jid; from = room_nick })
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50 :tag("x", { xmlns = "http://jabber.org/protocol/muc#user" })
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51 :tag("item", { affiliation = "none"; role = "none" })
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52 :text_tag("reason", err.text or "Connection to remote server lost")
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53 :up()
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54 :tag("status", { code = "110" }):up()
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55 :tag("status", { code = "333" }):up()
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56 :reset());
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57 end);
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58 -- TODO do this with some delay?
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59 end
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60 end
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61
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62 end
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63 end
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64 end
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65 end);