Mercurial > prosody-modules

annotate mod_presence_dedup/mod_presence_dedup.lua @ 4421:94805a7e7b30

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mod_invites: rework CLI parsing to support groups To make this sensible, the code had to move from rather simple parsing to something which looks more like getopt or your typical shell script.
author Jonas Schäfer <jonas@wielicki.name>
date Sun, 31 Jan 2021 19:16:36 +0100
parents 19924a2c4a48
children
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f24b02e0d706 mod_presence_dedup: Attempt at saving bandwith by deduplicating presence stanzas
Kim Alvefur <zash@zash.se>
parents:
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1 local st = require "util.stanza";
f24b02e0d706 mod_presence_dedup: Attempt at saving bandwith by deduplicating presence stanzas
Kim Alvefur <zash@zash.se>
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2 local cache = require "util.cache";
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Kim Alvefur <zash@zash.se>
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3 local add_filter = require "util.filters".add_filter;
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4
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5 local cache_size = module:get_option_number("presence_dedup_cache_size", 100);
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6
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Kim Alvefur <zash@zash.se>
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7 -- stanza equality tests
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Kim Alvefur <zash@zash.se>
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8 local function attr_eq(a, b)
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Kim Alvefur <zash@zash.se>
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9 if a == b then return true; end -- unlikely but not impossible
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Kim Alvefur <zash@zash.se>
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10 for k,v in pairs(a) do if b[k] ~= v then return false; end end
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Kim Alvefur <zash@zash.se>
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11 for k,v in pairs(b) do if a[k] ~= v then return false; end end
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12 return true;
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13 end
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14
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15 local function st_eq(a, b)
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16 if a == b then return true; end
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Kim Alvefur <zash@zash.se>
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17 if type(b) ~= "table" then return false; end
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Kim Alvefur <zash@zash.se>
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18 if getmetatable(b) ~= st.stanza_mt then return false; end
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Kim Alvefur <zash@zash.se>
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19 if a.name ~= b.name then return false; end
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Kim Alvefur <zash@zash.se>
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20 if #a ~= #b then return false; end
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Kim Alvefur <zash@zash.se>
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21 if not attr_eq(a.attr, b.attr) then return false; end
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Kim Alvefur <zash@zash.se>
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22 for i = 1, #a do if not st_eq(a[i], b[i]) then return false; end end
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23 return true;
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24 end
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25
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Kim Alvefur <zash@zash.se>
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26 local function dedup_presence(stanza, session)
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Kim Alvefur <zash@zash.se>
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27 if session.presence_cache and session.presence
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Kim Alvefur <zash@zash.se>
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28 and getmetatable(stanza) == st.stanza_mt and stanza.name == "presence"
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Kim Alvefur <zash@zash.se>
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29 and stanza.attr.xmlns == nil and stanza.attr.from then
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30 local cached = session.presence_cache:get(stanza.attr.from);
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31 if st_eq(stanza, cached) then
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32 return nil;
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33 else
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34 session.presence_cache:set(stanza.attr.from, st.clone(stanza));
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35 end
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36 end
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Kim Alvefur <zash@zash.se>
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37 return stanza;
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38 end
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39
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Kim Alvefur <zash@zash.se>
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40 module:hook("presence/initial", function (event)
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19924a2c4a48 mod_presence_dedup: Remove unused variables [luacheck]
Kim Alvefur <zash@zash.se>
parents: 2155
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41 local session = event.origin;
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Kim Alvefur <zash@zash.se>
parents:
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42 session.presence_cache = cache.new(cache_size);
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Kim Alvefur <zash@zash.se>
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43 add_filter(session, "stanzas/out", dedup_presence, 90);
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44 end);