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annotate mod_presence_dedup/mod_presence_dedup.lua @ 4049:78f1de5301fc

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mod_adhoc_dataforms_demo: Fix duplicate field prevention It's supposed to only include each type of form field once per form at most but it didn't note which fields it had added already. No idea what the probability was anyways, probably pretty low.
author Kim Alvefur <zash@zash.se>
date Tue, 23 Jun 2020 19:40:55 +0200
parents 19924a2c4a48
children
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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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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
f24b02e0d706 mod_presence_dedup: Attempt at saving bandwith by deduplicating presence stanzas
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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
f24b02e0d706 mod_presence_dedup: Attempt at saving bandwith by deduplicating presence stanzas
Kim Alvefur <zash@zash.se>
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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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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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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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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);