prosody-modules
8474a3b80200
mod_presence_dedup/mod_presence_dedup.lua

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mod_presence_dedup/mod_presence_dedup.lua @ 5160:8474a3b80200

mod_firewall: Fix 'is_admin' internal dependency rule #1797 (thanks diane) Looks like the boolean logic was inverted here. Instead, for now, simply check if is_admin is there. It is deprecated in trunk and was briefly removed before being brought back with a 'deprecated' warning as part of the new roles and permissions work. Making this dependency conditioned on the existence of the underlying function should make it work until it actually goes away for real.
author Kim Alvefur <zash@zash.se>
date Fri, 27 Jan 2023 23:06:25 +0100
parent 3445:19924a2c4a48
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rev   line source
2155
f24b02e0d706 mod_presence_dedup: Attempt at saving bandwith by deduplicating presence stanzas
Kim Alvefur <zash@zash.se>
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1 local st = require "util.stanza";
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2 local cache = require "util.cache";
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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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7 -- stanza equality tests
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8 local function attr_eq(a, b)
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9 if a == b then return true; end -- unlikely but not impossible
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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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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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17 if type(b) ~= "table" then return false; end
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18 if getmetatable(b) ~= st.stanza_mt then return false; end
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19 if a.name ~= b.name then return false; end
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20 if #a ~= #b then return false; end
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21 if not attr_eq(a.attr, b.attr) then return false; end
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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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26 local function dedup_presence(stanza, session)
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27 if session.presence_cache and session.presence
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28 and getmetatable(stanza) == st.stanza_mt and stanza.name == "presence"
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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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37 return stanza;
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38 end
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39
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40 module:hook("presence/initial", function (event)
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19924a2c4a48 mod_presence_dedup: Remove unused variables [luacheck]
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41 local session = event.origin;
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42 session.presence_cache = cache.new(cache_size);
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43 add_filter(session, "stanzas/out", dedup_presence, 90);
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44 end);