prosody-modules
2969ed764fe8
mod_presence_cache/mod_presence_cache.lua

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mod_presence_cache/mod_presence_cache.lua @ 3211:2969ed764fe8

mod_adhoc_test: A module to test dataforms generation and rendering
author Kim Alvefur <zash@zash.se>
date Fri, 03 Aug 2018 19:30:15 +0200
parent 3183:b718092e442f
child 3373:322e8e7ba7d4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2176
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diff changeset
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 jid_host = require"util.jid".host;
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10 local st = require"util.stanza";
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11 local datetime = require"util.datetime";
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12 local cache = require "util.cache";
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13
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14 local cache_size = module:get_option_number("presence_cache_size", 100);
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15
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16 local bare_cache = {}; -- [username NUL bare_jid] = { [full_jid] = { timestamp, ... } }
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17
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18 local function on_evict(cache_key)
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19 local bare_cache_key = cache_key:match("^%Z+%z[^/]+");
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20 local full_jid = cache_key:match("%z(.*)$");
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21 local jids = bare_cache[bare_cache_key];
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22
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23 if jids then
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24 jids[full_jid] = nil;
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25 if next(jids) == nil then
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26 bare_cache[bare_cache_key] = nil;
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27 end
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28 end
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29 end
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30
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31 -- used indirectly for the on_evict callback
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32 local presence_cache = cache.new(cache_size, on_evict);
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33
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34 local function cache_hook(event)
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35 local origin, stanza = event.origin, event.stanza;
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36 local typ = stanza.attr.type;
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37 module:log("debug", "Cache hook, got %s from a %s", stanza:top_tag(), origin.type);
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38 if origin.type == "s2sin" and ( typ == nil or typ == "unavailable" ) then
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39
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40 local contact_full = stanza.attr.from;
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41 local contact_bare = jid_bare(contact_full);
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42 local username, host = jid_split(stanza.attr.to);
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43
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44 if not is_contact_subscribed(username, host, contact_bare) then
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45 module:log("debug", "Presence from jid not in roster");
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46 return;
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47 end
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48
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49 local cache_key = username .. "\0" .. contact_full;
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50 local bare_cache_key = username .. "\0" .. contact_bare;
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51
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52 local jids = bare_cache[bare_cache_key];
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53
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54 if typ == "unavailable" then -- remove from cache
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55 presence_cache:set(cache_key, nil);
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56 on_evict(cache_key);
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57 return;
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58 end
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59
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60 local presence_bits = {
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61 stamp = datetime.datetime();
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62 show = stanza:get_child_text("show");
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63 };
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64 if jids then
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65 jids[contact_full] = presence_bits;
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66 else
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67 jids = { [contact_full] = presence_bits };
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68 bare_cache[bare_cache_key] = jids;
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69 end
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70 presence_cache:set(cache_key, true);
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71 end
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72 end
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73
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74 module:hook("presence/bare", cache_hook, 10);
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75 -- module:hook("presence/full", cache_hook, 10);
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76
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77 local function answer_probe_from_cache(event)
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78 local origin, stanza = event.origin, event.stanza;
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79 if stanza.attr.type ~= "probe" then return; end
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80
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81 local username = origin.username;
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82 local contact_bare = stanza.attr.to;
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83 if not contact_bare then return; end -- probe to self
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84
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85 local bare_cache_key = username .. "\0" .. contact_bare;
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86
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87 local cached = bare_cache[bare_cache_key];
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88 if not cached then return end
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89 for jid, presence_bits in pairs(cached) do
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90 local presence = st.presence({ to = origin.full_jid, from = jid })
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91 if presence_bits.show then
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92 presence:tag("show"):text(presence_bits.show):up();
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93 end
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94 if presence_bits.stamp then
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95 presence:tag("delay", { xmlns = "urn:xmpp:delay", from = module.host, stamp = presence_bits.stamp }):up();
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96 end
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97 origin.send(presence);
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98 end
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99 end
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100
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101 module:hook("pre-presence/bare", answer_probe_from_cache, 10);
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102
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103 local function clear_cache_from_s2s(remote, reason)
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104 if not remote then return end
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105 if reason and reason:find("timeout") then return end -- Ignore connections closed for being idle
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106
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107 module:log("debug", "Dropping cached presence from host %s", remote);
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108
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109 for bare, cached in pairs(bare_cache) do
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110 if jid_host(bare) == remote then
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111 for jid in pairs(cached) do
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112 presence_cache:set(jid, nil);
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113 end
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114 bare_cache[bare] = nil;
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115 end
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116 end
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117 end
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118
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119 module:hook("s2sin-destroyed", function (event)
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120 return clear_cache_from_s2s(event.session.from_host, event.reason);
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121 end);
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122
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123 module:hook("s2sout-destroyed", function (event)
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124 return clear_cache_from_s2s(event.session.to_host, event.reason);
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125 end);