author | Matthew Wild <mwild1@gmail.com> |
Sun, 03 Mar 2024 18:06:47 +0000 | |
changeset 5861 | ff90dad75352 |
parent 3449 | 19924a2c4a48 |
permissions | -rw-r--r-- |
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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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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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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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and getmetatable(stanza) == st.stanza_mt and stanza.name == "presence" |
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and stanza.attr.xmlns == nil and stanza.attr.from then |
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local cached = session.presence_cache:get(stanza.attr.from); |
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if st_eq(stanza, cached) then |
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32 |
return nil; |
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else |
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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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local session = event.origin; |
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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); |