prosody-modules
3a6a48b83b4f
mod_presence_cache/mod_presence_cache.lua

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mod_presence_cache/mod_presence_cache.lua @ 3095:3a6a48b83b4f

mod_slack_webhooks: Reduce scope of variable
author Kim Alvefur <zash@zash.se>
date Sat, 02 Jun 2018 15:00:27 +0200
parent 2292:54f44365a378
child 3183:b718092e442f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 -- XEP-0280: Message Carbons implementation for Prosody
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2 -- Copyright (C) 2015-2016 Kim Alvefur
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3 --
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4 -- This file is MIT/X11 licensed.
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5
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6 local is_contact_subscribed = require"core.rostermanager".is_contact_subscribed;
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7 local jid_split = require"util.jid".split;
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8 local jid_bare = require"util.jid".bare;
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9 local st = require"util.stanza";
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10 local datetime = require"util.datetime";
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11 local cache = require "util.cache";
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12
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13 local cache_size = module:get_option_number("presence_cache_size", 100);
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15 local bare_cache = {}; -- [username NUL bare_jid] = { [full_jid] = { timestamp, ... } }
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16
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17 local function on_evict(cache_key)
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18 local bare_cache_key = cache_key:match("^%Z+%z[^/]+");
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19 local full_jid = cache_key:match("%z(.*)$");
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20 local jids = bare_cache[bare_cache_key];
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21
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22 if jids then
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23 jids[full_jid] = nil;
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24 if next(jids) == nil then
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25 bare_cache[bare_cache_key] = nil;
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26 end
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27 end
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28 end
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29
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30 -- used indirectly for the on_evict callback
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31 local presence_cache = cache.new(cache_size, on_evict);
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32
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33 local function cache_hook(event)
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34 local origin, stanza = event.origin, event.stanza;
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35 local typ = stanza.attr.type;
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36 module:log("debug", "Cache hook, got %s from a %s", stanza:top_tag(), origin.type);
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37 if origin.type == "s2sin" and ( typ == nil or typ == "unavailable" ) then
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38
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39 local contact_full = stanza.attr.from;
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40 local contact_bare = jid_bare(contact_full);
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41 local username, host = jid_split(stanza.attr.to);
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42
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43 if not is_contact_subscribed(username, host, contact_bare) then
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44 module:log("debug", "Presence from jid not in roster");
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45 return;
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46 end
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47
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48 local cache_key = username .. "\0" .. contact_full;
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49 local bare_cache_key = username .. "\0" .. contact_bare;
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50
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51 local jids = bare_cache[bare_cache_key];
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52
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53 if typ == "unavailable" then -- remove from cache
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54 presence_cache:set(cache_key, nil);
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55 on_evict(cache_key);
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56 return;
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57 end
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58
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59 local presence_bits = {
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60 stamp = datetime.datetime();
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61 show = stanza:get_child_text("show");
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62 };
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63 if jids then
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64 jids[contact_full] = presence_bits;
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65 else
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66 jids = { [contact_full] = presence_bits };
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67 bare_cache[bare_cache_key] = jids;
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68 end
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69 presence_cache:set(cache_key, true);
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70 end
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71 end
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72
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73 module:hook("presence/bare", cache_hook, 10);
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74 -- module:hook("presence/full", cache_hook, 10);
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75
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76 local function answer_probe_from_cache(event)
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77 local origin, stanza = event.origin, event.stanza;
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78 if stanza.attr.type ~= "probe" then return; end
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79
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80 local username = origin.username;
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81 local contact_bare = stanza.attr.to;
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82 if not contact_bare then return; end -- probe to self
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83
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84 local bare_cache_key = username .. "\0" .. contact_bare;
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85
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86 local cached = bare_cache[bare_cache_key];
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87 if not cached then return end
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88 for jid, presence_bits in pairs(cached) do
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89 local presence = st.presence({ to = origin.full_jid, from = jid })
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90 if presence_bits.show then
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91 presence:tag("show"):text(presence_bits.show):up();
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92 end
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93 if presence_bits.stamp then
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94 presence:tag("delay", { xmlns = "urn:xmpp:delay", from = module.host, stamp = presence_bits.stamp }):up();
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95 end
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96 origin.send(presence);
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97 end
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98 end
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99
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100 module:hook("pre-presence/bare", answer_probe_from_cache, 10);