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mod_muc_limits/README.markdown @ 5608:6680a1f53353

mod_muc_limits: Reduce cost of multi-line messages, make configurable Typing a 5-line message preceded by a few chat states would have hit the default limit.
author Kim Alvefur <zash@zash.se>
date Sat, 15 Jul 2023 09:09:41 +0200
parent 5567:d52cc18f0aa8
child 5609:bae2f4830a93
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1 ---
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2 labels:
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3 - 'Stage-Beta'
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4 summary: 'Impose rate-limits on a MUC'
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5 ...
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7 Introduction
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8 ============
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9
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10 This module allows you to control the maximum rate of 'events' in a MUC
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11 room. This makes it useful to prevent room floods (whether malicious or
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12 accidental).
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14 Details
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15 =======
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16
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17 This module limits the following events:
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18
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19 - Room joins
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20 - Nick changes
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21 - Status changes
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22 - Messages (including private messages)
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23
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24 The limit is for the room as a whole, not individual occupants in the
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25 room. Users with an affiliation (members, admins and owners) are not
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26 limited.
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28 Configuration
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29 =============
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30
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31 Add the module to the MUC host (not the global modules\_enabled):
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32
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33 Component "conference.example.com" "muc"
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34 modules_enabled = { "muc_limits" }
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35
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36 You can define (globally or per-MUC component) the following options:
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37
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38 Name Default value Description
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39 --------------------------- --------------- ----------------------------------------------------------
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40 muc_event_rate 0.5 The maximum number of events per second.
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41 muc_burst_factor 6 Allow temporary bursts of this multiple.
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42 muc_max_nick_length 23 The maximum allowed length of user nicknames
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43 muc_max_char_count 5664 The maximum allowed number of bytes in a message
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44 muc_max_line_count 23 The maximum allowed number of lines in a message
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45 muc_limit_base_cost 1 Base cost of sending a stanza
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46 muc_line_count_multiplier 0.1 Additional cost of each newline in the body of a message
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48 For more understanding of how these values are used, see the algorithm
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49 section below.
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51 Algorithm
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52 =========
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53
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54 A certain number of events are allowed per second, given by
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55 muc\_event\_rate. An event rate of 1 allows one event per second, and
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56 event rate of 3 allows three events per second, and 0.5 allows one event
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57 every two seconds, and so on.
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58
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59 Obviously MUC conversations are not exactly steady streams of events.
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60 Sometimes multiple people will talk at once. This is handled by the
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61 muc\_burst\_factor option.
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63 A burst factor of 2 will allow 2 times as many events at once, for 2
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64 seconds, before throttling will be triggered. A factor of 5, 5 times as
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65 many events for 5 seconds.
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66
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67 When the limit is reached, an error response will be generated telling
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68 the user the MUC is overactive, and asking them to try again.
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70 Compatibility
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71 =============
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72
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73 ------- ------------------
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74 trunk Works
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75 0.11 Works
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76 0.10 Works
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77 0.9 Works
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78 0.8 Doesn't work[^1]
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79 ------- ------------------
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81 [^1]: This module can be made to work in 0.8 (and *maybe* previous
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82 versions) of Prosody by copying the new
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83 [util.throttle](http://hg.prosody.im/trunk/raw-file/fc8a22936b3c/util/throttle.lua)
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84 into your Prosody source directory (into the util/ subdirectory).