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mod_muc_limits/README.markdown

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mod_muc_limits/README.markdown @ 1803:4d73a1a6ba68

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author Kim Alvefur <zash@zash.se>
date Fri, 28 Aug 2015 18:03:58 +0200
parent 1782:mod_muc_limits/README.wiki@29f3d6b7ad16
child 1833:52e998bb4490
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1 ---
2 labels:
3 - 'Stage-Beta'
4 summary: 'Impose rate-limits on a MUC'
5 ...
6
7 Introduction
8 ============
9
10 This module allows you to control the maximum rate of 'events' in a MUC
11 room. This makes it useful to prevent room floods (whether malicious or
12 accidental).
13
14 Details
15 =======
16
17 This module limits the following events:
18
19 - Room joins
20 - Nick changes
21 - Status changes
22 - Messages (including private messages)
23
24 The limit is for the room as a whole, not individual occupants in the
25 room. Users with an affiliation (members, admins and owners) are not
26 limited.
27
28 Configuration
29 =============
30
31 Add the module to the MUC host (not the global modules\_enabled):
32
33 Component "conference.example.com" "muc"
34 modules_enabled = { "muc_limits" }
35
36 You can define (globally or per-MUC component) the following options:
37
38 Name Default value Description
39 -------------------- --------------- ------------------------------------------
40 muc\_event\_rate 0.5 The maximum number of events per second.
41 muc\_burst\_factor 6 Allow temporary bursts of this multiple.
42
43 For more understanding of how these values are used, see the algorithm
44 section below.
45
46 Algorithm
47 =========
48
49 A certain number of events are allowed per second, given by
50 muc\_event\_rate. An event rate of 1 allows one event per second, and
51 event rate of 3 allows three events per second, and 0.5 allows one event
52 every two seconds, and so on.
53
54 Obviously MUC conversations are not exactly steady streams of events.
55 Sometimes multiple people will talk at once. This is handled by the
56 muc\_burst\_factor option.
57
58 A burst factor of 2 will allow 2 times as many events at once, for 2
59 seconds, before throttling will be triggered. A factor of 5, 5 times as
60 many events for 5 seconds.
61
62 When the limit is reached, an error response will be generated telling
63 the user the MUC is overactive, and asking them to try again.
64
65 Compatibility
66 =============
67
68 ------- -----------------
69 Trunk Works
70 0.8 Doesn't work`*`
71 ------- -----------------
72
73 `*` This module can be made to work in 0.8 (and *maybe* previous
74 versions) of Prosody by copying the new
75 [util.throttle](http://hg.prosody.im/trunk/raw-file/fc8a22936b3c/util/throttle.lua)
76 into your Prosody source directory (into the util/ subdirectory).