Mercurial > prosody-modules

annotate mod_presence_dedup/mod_presence_dedup.lua @ 5149:fa56ed2bacab

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mod_unified_push: Add support for multiple token backends, including stoage Now that we have ACLs by default, it is no longer necessary to be completely stateless. On 0.12, using storage has benefits over JWT, because it does not expose client JIDs to the push apps/services. In trunk, PASETO is stateless and does not expose client JIDs.
author Matthew Wild <mwild1@gmail.com>
date Sat, 14 Jan 2023 14:31:37 +0000
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>
parents:
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2 local cache = require "util.cache";
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Kim Alvefur <zash@zash.se>
parents:
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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)
f24b02e0d706 mod_presence_dedup: Attempt at saving bandwith by deduplicating presence stanzas
Kim Alvefur <zash@zash.se>
parents:
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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>
parents:
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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>
parents:
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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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Kim Alvefur <zash@zash.se>
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15 local function st_eq(a, b)
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parents:
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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
f24b02e0d706 mod_presence_dedup: Attempt at saving bandwith by deduplicating presence stanzas
Kim Alvefur <zash@zash.se>
parents:
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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>
parents:
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19 if a.name ~= b.name then return false; end
f24b02e0d706 mod_presence_dedup: Attempt at saving bandwith by deduplicating presence stanzas
Kim Alvefur <zash@zash.se>
parents:
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20 if #a ~= #b then return false; end
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Kim Alvefur <zash@zash.se>
parents:
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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>
parents:
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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>
parents:
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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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Kim Alvefur <zash@zash.se>
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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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Kim Alvefur <zash@zash.se>
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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
diff changeset
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>
parents:
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43 add_filter(session, "stanzas/out", dedup_presence, 90);
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44 end);