prosody-modules
bb4a2e4b7ba7
mod_presence_cache/mod_presence_cache.lua

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mod_presence_cache/mod_presence_cache.lua @ 2152:bb4a2e4b7ba7

mod_presence_cache: Forget about cached presence when receiving unavailable
author Kim Alvefur <zash@zash.se>
date Sun, 03 Apr 2016 00:37:11 +0200
parent 2147:ed2bb50d4f91
child 2153:aa24d49c47ef
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1952
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1 local is_contact_subscribed = require"core.rostermanager".is_contact_subscribed;
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2 local jid_split = require"util.jid".split;
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3 local jid_bare = require"util.jid".bare;
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4 local st = require"util.stanza";
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5 local datetime = require"util.datetime";
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6 local cache = require "util.cache";
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7
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8 local cache_size = module:get_option_number("presence_cache_size", 100);
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9
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10 local bare_cache = {}; -- [username NUL bare_jid] = { [full_jid] = timestamp, ... }
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11
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12 local function on_evict(cache_key)
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13 local bare_cache_key = cache_key:match("^%Z+%z[^/]+");
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14 local full_jid = cache_key:match("%z(.*)$");
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15 local jids = bare_cache[bare_cache_key];
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16
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17 if jids then
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18 jids[full_jid] = nil;
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19 end
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20 if next(jids) == nil then
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21 bare_cache[bare_cache_key] = nil;
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22 end
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23 end
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24
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25 -- used indirectly for the on_evict callback
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26 local presence_cache = cache.new(cache_size, on_evict);
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27
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28 local function cache_hook(event)
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29 local origin, stanza = event.origin, event.stanza;
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30 local typ = stanza.attr.type;
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31 module:log("debug", "Cache hook, got %s from a %s", stanza:top_tag(), origin.type);
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32 if origin.type == "s2sin" and ( typ == nil or typ == "unavailable" ) then
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33
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34 local contact_full = stanza.attr.from;
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35 local contact_bare = jid_bare(contact_full);
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36 local username, host = jid_split(stanza.attr.to);
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37
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38 if not is_contact_subscribed(username, host, contact_bare) then
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39 module:log("debug", "Presence from jid not in roster");
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40 return;
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41 end
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42
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43 local cache_key = username .. "\0" .. contact_full;
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44 local bare_cache_key = username .. "\0" .. contact_bare;
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45
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46 local jids = bare_cache[bare_cache_key];
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47
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48 if typ == "unavailable" then -- remove from cache
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49 presence_cache:set(cache_key, nil);
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50 on_evict(cache_key);
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51 return;
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52 end
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53
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54 local stamp = datetime.datetime();
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55 if jids then
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56 jids[contact_full] = stamp;
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57 else
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58 jids = { [contact_full] = stamp };
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59 bare_cache[bare_cache_key] = jids;
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60 end
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61 presence_cache:set(cache_key, true);
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62 end
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63 end
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64
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65 module:hook("presence/bare", cache_hook, 10);
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66 -- module:hook("presence/full", cache_hook, 10);
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67
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68 local function answer_probe_from_cache(event)
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69 local origin, stanza = event.origin, event.stanza;
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70 if stanza.attr.type ~= "probe" then return; end
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71
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72 local username = origin.username;
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73 local contact_bare = stanza.attr.to;
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74
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75 local bare_cache_key = username .. "\0" .. contact_bare;
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76
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77 local cached = bare_cache[bare_cache_key];
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78 if not cached then return end
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79 for jid, stamp in pairs(cached) do
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80 local presence = st.presence({ to = origin.full_jid, from = jid })
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81 :tag("delay", { xmlns = "urn:xmpp:delay", from = module.host, stamp = stamp }):up();
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82 origin.send(presence);
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83 end
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84 end
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85
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86 module:hook("pre-presence/bare", answer_probe_from_cache, 10);