annotate mod_throttle_presence/mod_throttle_presence.lua @ 2436:a01a3fb96302

mod_measure_memory: Module is global, no need for a global hook
author Kim Alvefur <zash@zash.se>
date Fri, 06 Jan 2017 17:07:01 +0100
parents 552faee596b7
children
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1 local filters = require "util.filters";
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2 local st = require "util.stanza";
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3
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4 module:depends("csi");
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6 local function presence_filter(stanza, session)
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7 if getmetatable(stanza) ~= st.stanza_mt then
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8 return stanza; -- Things we don't want to touch
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9 end
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10 if stanza._flush then
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11 stanza._flush = nil;
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12 return stanza;
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13 end
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14 local buffer = session.presence_buffer;
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15 local from = stanza.attr.from;
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16 if stanza.name == "presence" and (stanza.attr.type == nil or stanza.attr.type == "unavailable") then
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17 module:log("debug", "Buffering presence stanza from %s to %s", stanza.attr.from, session.full_jid);
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18 buffer[stanza.attr.from] = st.clone(stanza);
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19 return nil; -- Drop this stanza (we've stored it for later)
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20 else
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21 local cached_presence = buffer[stanza.attr.from];
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22 if cached_presence then
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23 module:log("debug", "Important stanza for %s from %s, flushing presence", session.full_jid, from);
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24 stanza._flush = true;
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25 cached_presence._flush = true;
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26 session.send(cached_presence);
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27 buffer[stanza.attr.from] = nil;
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28 end
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29 end
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30 return stanza;
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31 end
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33 local function throttle_session(event)
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34 local session = event.origin;
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parents: 162
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35 if session.presence_buffer then return; end
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parents: 162
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36 module:log("debug", "Suppressing presence updates to %s", session.full_jid);
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parents: 162
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37 session.presence_buffer = {};
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parents: 162
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38 filters.add_filter(session, "stanzas/out", presence_filter);
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parents: 162
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39 end
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parents: 162
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41 local function restore_session(event)
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42 local session = event.origin;
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parents: 162
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43 if not session.presence_buffer then return; end
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parents: 162
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44 filters.remove_filter(session, "stanzas/out", presence_filter);
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parents: 162
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45 module:log("debug", "Flushing buffer for %s", session.full_jid);
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46 for jid, presence in pairs(session.presence_buffer) do
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parents: 162
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47 session.send(presence);
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parents: 162
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48 end
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49 session.presence_buffer = nil;
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parents: 162
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50 end
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52 module:hook("csi-client-inactive", throttle_session);
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53 module:hook("csi-client-active", restore_session);