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annotate mod_presence_dedup/mod_presence_dedup.lua @ 5296:0f5657db1cfc

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mod_isolate_host: handle server-generated stanzas The hook for setting the no_host_isolation is only called for c2s sessions. This does not work for stanzas generated by the server, such as PEP notifications or presence probe answers. To handle that, we do per-stanza checks for the case that the origin is local.
author Jonas Schäfer <jonas@wielicki.name>
date Sat, 01 Apr 2023 12:03:08 +0200
parents 19924a2c4a48
children
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2155
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
f24b02e0d706 mod_presence_dedup: Attempt at saving bandwith by deduplicating presence stanzas
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
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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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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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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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);