Mercurial > prosody-modules
view mod_presence_dedup/mod_presence_dedup.lua @ 4537:53ee391ca689
mod_smacks: Fix traceback due to session being destroyed in send()
Sending something can cause the OS to notice that the connection is dead
and then the connection can be dead at this point. More likely if
opportunistic_writes is enabled.
author | Kim Alvefur <zash@zash.se> |
---|---|
date | Thu, 01 Apr 2021 11:35:26 +0200 |
parents | 19924a2c4a48 |
children |
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local st = require "util.stanza"; local cache = require "util.cache"; local add_filter = require "util.filters".add_filter; local cache_size = module:get_option_number("presence_dedup_cache_size", 100); -- stanza equality tests local function attr_eq(a, b) if a == b then return true; end -- unlikely but not impossible for k,v in pairs(a) do if b[k] ~= v then return false; end end for k,v in pairs(b) do if a[k] ~= v then return false; end end return true; end local function st_eq(a, b) if a == b then return true; end if type(b) ~= "table" then return false; end if getmetatable(b) ~= st.stanza_mt then return false; end if a.name ~= b.name then return false; end if #a ~= #b then return false; end if not attr_eq(a.attr, b.attr) then return false; end for i = 1, #a do if not st_eq(a[i], b[i]) then return false; end end return true; end local function dedup_presence(stanza, session) if session.presence_cache and session.presence and getmetatable(stanza) == st.stanza_mt and stanza.name == "presence" and stanza.attr.xmlns == nil and stanza.attr.from then local cached = session.presence_cache:get(stanza.attr.from); if st_eq(stanza, cached) then return nil; else session.presence_cache:set(stanza.attr.from, st.clone(stanza)); end end return stanza; end module:hook("presence/initial", function (event) local session = event.origin; session.presence_cache = cache.new(cache_size); add_filter(session, "stanzas/out", dedup_presence, 90); end);