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annotate mod_ping_muc/mod_ping_muc.lua @ 4877:adc6241e5d16

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mod_measure_process: Report the enforced limit The soft limit is what the kernel actually enforces, while the hard limit is is how far you can change the soft limit without privileges. Unless the process dynamically adjusts the soft limit, knowing the hard limit is not as useful as knowing the soft limit. Reporting the soft limit and the number of in-use FDs allows placing alerts on expressions like 'process_open_fds / process_max_fds >= 0.95'
author Kim Alvefur <zash@zash.se>
date Tue, 18 Jan 2022 18:55:20 +0100
parents a7c0c70e64b6
children 806f7c8d830b
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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";
a7c0c70e64b6 mod_ping_muc: Yet another attempt to improve MUC reliability
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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
a7c0c70e64b6 mod_ping_muc: Yet another attempt to improve MUC reliability
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43 -- user is still joined is indeterminate and we might as well
a7c0c70e64b6 mod_ping_muc: Yet another attempt to improve MUC reliability
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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 })
a7c0c70e64b6 mod_ping_muc: Yet another attempt to improve MUC reliability
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46 :tag("ping", { xmlns = "urn:xmpp:ping"; }))
a7c0c70e64b6 mod_ping_muc: Yet another attempt to improve MUC reliability
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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 = "307" }):up()
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56 :tag("status", { code = "333" }):up()
a7c0c70e64b6 mod_ping_muc: Yet another attempt to improve MUC reliability
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57 :reset());
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58 end);
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59 -- TODO do this with some delay?
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60 end
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61 end
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62
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63 end
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64 end
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65 end
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66 end);