Mercurial > prosody-modules
annotate mod_presence_cache/mod_presence_cache.lua @ 2936:4fed2379f5be
README: Remove text about 0.8 compatibility repo
The Google Code repo is probably defunct anyways.
author | Kim Alvefur <zash@zash.se> |
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date | Sat, 17 Mar 2018 10:49:15 +0100 |
parents | 54f44365a378 |
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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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14 |
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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); |