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annotate mod_throttle_presence/mod_throttle_presence.lua @ 1816:e5d723afd6ba

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mod_http_upload: Add README
author Kim Alvefur <zash@zash.se>
date Tue, 01 Sep 2015 12:22:43 +0200
parents b8164f18142a
children 34468d3bfcac
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Matthew Wild <mwild1@gmail.com>
parents: 162
diff changeset
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 stanza._flush then
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8 stanza._flush = nil;
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9 return stanza;
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10 end
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11 local buffer = session.presence_buffer;
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12 local from = stanza.attr.from;
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13 if stanza.name ~= "presence" or (stanza.attr.type and stanza.attr.type ~= "unavailable") then
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14 local cached_presence = buffer[stanza.attr.from];
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15 if cached_presence then
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parents: 162
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16 module:log("debug", "Important stanza for %s from %s, flushing presence", session.full_jid, from);
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17 stanza._flush = true;
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18 cached_presence._flush = true;
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19 session.send(cached_presence);
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20 buffer[stanza.attr.from] = nil;
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21 end
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22 else
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23 module:log("debug", "Buffering presence stanza from %s to %s", stanza.attr.from, session.full_jid);
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24 buffer[stanza.attr.from] = st.clone(stanza);
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25 return nil; -- Drop this stanza (we've stored it for later)
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26 end
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27 return stanza;
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28 end
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30 local function throttle_session(event)
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31 local session = event.origin;
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parents: 162
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32 if session.presence_buffer then return; end
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parents: 162
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33 module:log("debug", "Suppressing presence updates to %s", session.full_jid);
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parents: 162
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34 session.presence_buffer = {};
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parents: 162
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35 filters.add_filter(session, "stanzas/out", presence_filter);
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parents: 162
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36 end
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parents: 162
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38 local function restore_session(event)
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39 local session = event.origin;
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parents: 162
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40 if not session.presence_buffer then return; end
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parents: 162
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41 filters.remove_filter(session, "stanzas/out", presence_filter);
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parents: 162
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42 module:log("debug", "Flushing buffer for %s", session.full_jid);
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parents: 162
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43 for jid, presence in pairs(session.presence_buffer) do
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44 session.send(presence);
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parents: 162
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45 end
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parents: 162
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46 session.presence_buffer = nil;
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parents: 162
diff changeset
47 end
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parents: 162
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49 module:hook("csi-client-inactive", throttle_session);
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parents: 162
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50 module:hook("csi-client-active", restore_session);